lib.istanbul.js

#!/usr/bin/env node
/*
 * lib.istanbul.js (2020.11.12)
 * https://github.com/kaizhu256/node-istanbul-lite
 * this zero-dependency package will provide browser-compatible version of istanbul coverage-tool (v0.4.5), with working web-demo
 *
 */


/* istanbul instrument in package istanbul */
// assets.utility2.header.js - start
/* jslint utility2:true */
/* istanbul ignore next */
// run shared js-env code - init-local
(function () {
    "use strict";
    let isBrowser;
    let isWebWorker;
    let local;
    // polyfill globalThis
    if (!(typeof globalThis === "object" && globalThis)) {
        if (typeof window === "object" && window && window.window === window) {
            window.globalThis = window;
        }
        if (typeof global === "object" && global && global.global === global) {
            global.globalThis = global;
        }
    }
    // init debugInline
    if (!globalThis.debugInline) {
        let consoleError;
        consoleError = console.error;
        globalThis.debugInline = function (...argList) {
        /*
         * this function will both print <argList> to stderr
         * and return <argList>[0]
         */
            consoleError("\n\ndebugInline");
            consoleError(...argList);
            consoleError("\n");
            return argList[0];
        };
    }
    // init isBrowser
    isBrowser = (
        typeof globalThis.XMLHttpRequest === "function"
        && globalThis.navigator
        && typeof globalThis.navigator.userAgent === "string"
    );
    // init isWebWorker
    isWebWorker = (
        isBrowser && typeof globalThis.importScripts === "function"
    );
    // init function
    function objectDeepCopyWithKeysSorted(obj) {
    /*
     * this function will recursively deep-copy <obj> with keys sorted
     */
        let sorted;
        if (typeof obj !== "object" || !obj) {
            return obj;
        }
        // recursively deep-copy list with child-keys sorted
        if (Array.isArray(obj)) {
            return obj.map(objectDeepCopyWithKeysSorted);
        }
        // recursively deep-copy obj with keys sorted
        sorted = {};
        Object.keys(obj).sort().forEach(function (key) {
            sorted[key] = objectDeepCopyWithKeysSorted(obj[key]);
        });
        return sorted;
    }
    function assertJsonEqual(aa, bb) {
    /*
     * this function will assert JSON.stringify(<aa>) === JSON.stringify(<bb>)
     */
        aa = JSON.stringify(objectDeepCopyWithKeysSorted(aa));
        bb = JSON.stringify(objectDeepCopyWithKeysSorted(bb));
        if (aa !== bb) {
            throw new Error(JSON.stringify(aa) + " !== " + JSON.stringify(bb));
        }
    }
    function assertOrThrow(passed, msg) {
    /*
     * this function will throw <msg> if <passed> is falsy
     */
        if (passed) {
            return;
        }
        throw (
            (
                msg
                && typeof msg.message === "string"
                && typeof msg.stack === "string"
            )
            // if msg is err, then leave as is
            ? msg
            : new Error(
                typeof msg === "string"
                // if msg is string, then leave as is
                ? msg
                // else JSON.stringify(msg)
                : JSON.stringify(msg, undefined, 4)
            )
        );
    }
    function coalesce(...argList) {
    /*
     * this function will coalesce null, undefined, or "" in <argList>
     */
        let arg;
        let ii;
        ii = 0;
        while (ii < argList.length) {
            arg = argList[ii];
            if (arg !== undefined && arg !== null && arg !== "") {
                return arg;
            }
            ii += 1;
        }
        return arg;
    }
    function identity(val) {
    /*
     * this function will return <val>
     */
        return val;
    }
    function noop() {
    /*
     * this function will do nothing
     */
        return;
    }
    function objectAssignDefault(tgt = {}, src = {}, depth = 0) {
    /*
     * this function will if items from <tgt> are null, undefined, or "",
     * then overwrite them with items from <src>
     */
        let recurse;
        recurse = function (tgt, src, depth) {
            Object.entries(src).forEach(function ([
                key, bb
            ]) {
                let aa;
                aa = tgt[key];
                if (aa === undefined || aa === null || aa === "") {
                    tgt[key] = bb;
                    return;
                }
                if (
                    depth !== 0
                    && typeof aa === "object" && aa && !Array.isArray(aa)
                    && typeof bb === "object" && bb && !Array.isArray(bb)
                ) {
                    recurse(aa, bb, depth - 1);
                }
            });
        };
        recurse(tgt, src, depth | 0);
        return tgt;
    }
    function onErrorThrow(err) {
    /*
     * this function will throw <err> if exists
     */
        if (err) {
            throw err;
        }
    }
    // bug-workaround - throw unhandledRejections in node-process
    if (
        typeof process === "object" && process
        && typeof process.on === "function"
        && process.unhandledRejections !== "strict"
    ) {
        process.unhandledRejections = "strict";
        process.on("unhandledRejection", function (err) {
            throw err;
        });
    }
    // init local
    local = {
        assertJsonEqual,
        assertOrThrow,
        coalesce,
        identity,
        isBrowser,
        isWebWorker,
        local,
        noop,
        objectAssignDefault,
        objectDeepCopyWithKeysSorted,
        onErrorThrow
    };
    globalThis.globalLocal = local;
}());
// assets.utility2.header.js - end


(function (local) {
"use strict";


/* istanbul ignore next */
// run shared js-env code - init-before
(function () {
// init local
local = (
    globalThis.utility2_rollup
    // || globalThis.utility2_rollup_old
    // || require("./assets.utility2.rollup.js")
    || globalThis.globalLocal
);
// init exports
if (local.isBrowser) {
    globalThis.utility2_istanbul = local;
} else {
    module.exports = local;
    module.exports.__dirname = __dirname;
}
// init lib main
local.istanbul = local;


/* validateLineSortedReset */
local.cliRun = function ({
    rgxComment
}) {
/*
 * this function will run cli
 */
    let cliDict;
    cliDict = local.cliDict;
    cliDict._eval = cliDict._eval || function () {
    /*
     * <code>
     * will eval <code>
     */
        globalThis.local = local;
        require("vm").runInThisContext(process.argv[3]);
    };
    cliDict._help = cliDict._help || function () {
    /*
     *
     * will print help
     */
        let commandList;
        let file;
        let packageJson;
        let str;
        let strDict;
        commandList = [
            {
                argList: "<arg2>  ...",
                description: "usage:",
                command: [
                    "<arg1>"
                ]
            }, {
                argList: "'console.log(\"hello world\")'",
                description: "example:",
                command: [
                    "--eval"
                ]
            }
        ];
        file = __filename.replace((
            /.*\//
        ), "");
        packageJson = require("./package.json");
        // validate comment
        rgxComment = rgxComment || (
            /\)\u0020\{\n(?:|\u0020{4})\/\*\n(?:\u0020|\u0020{5})\*((?:\u0020<[^>]*?>|\u0020\.\.\.)*?)\n(?:\u0020|\u0020{5})\*\u0020(will\u0020.*?\S)\n(?:\u0020|\u0020{5})\*\/\n(?:\u0020{4}|\u0020{8})\S/
        );
        strDict = {};
        Object.keys(cliDict).sort().forEach(function (key, ii) {
            if (key[0] === "_" && key !== "_default") {
                return;
            }
            str = String(cliDict[key]);
            if (key === "_default") {
                key = "";
            }
            strDict[str] = strDict[str] || (ii + 2);
            ii = strDict[str];
            if (commandList[ii]) {
                commandList[ii].command.push(key);
                return;
            }
            commandList[ii] = rgxComment.exec(str);
            local.assertOrThrow(commandList[ii], (
                "cliRun - cannot parse comment in COMMAND "
                + key
                + ":\nnew RegExp("
                + JSON.stringify(rgxComment.source)
                + ").exec(" + JSON.stringify(str).replace((
                    /\\\\/g
                ), "\u0000").replace((
                    /\\n/g
                ), "\\n\\\n").replace((
                    /\u0000/g
                ), "\\\\") + ");"
            ));
            commandList[ii] = {
                argList: local.coalesce(commandList[ii][1], "").trim(),
                command: [
                    key
                ],
                description: commandList[ii][2]
            };
        });
        str = "";
        str += packageJson.name + " (" + packageJson.version + ")\n\n";
        str += commandList.filter(function (elem) {
            return elem;
        }).map(function (elem, ii) {
            elem.command = elem.command.filter(function (elem) {
                return elem;
            });
            switch (ii) {
            case 0:
            case 1:
                elem.argList = [
                    elem.argList
                ];
                break;
            default:
                elem.argList = elem.argList.split(" ");
                elem.description = (
                    "# COMMAND "
                    + (elem.command[0] || "<none>") + "\n# "
                    + elem.description
                );
            }
            return (
                elem.description + "\n  " + file
                + "  " + elem.command.sort().join("|") + "  "
                + elem.argList.join("  ")
            );
        }).join("\n\n");
        console.log(str);
    };
    cliDict["--eval"] = cliDict["--eval"] || cliDict._eval;
    cliDict["--help"] = cliDict["--help"] || cliDict._help;
    cliDict["-e"] = cliDict["-e"] || cliDict._eval;
    cliDict["-h"] = cliDict["-h"] || cliDict._help;
    cliDict._default = cliDict._default || cliDict._help;
    cliDict.help = cliDict.help || cliDict._help;
    cliDict._interactive = cliDict._interactive || function () {
    /*
     *
     * will start interactive-mode
     */
        globalThis.local = local;
        local.identity(local.replStart || require("repl").start)({
            useGlobal: true
        });
    };
    cliDict["--interactive"] = cliDict["--interactive"] || cliDict._interactive;
    cliDict["-i"] = cliDict["-i"] || cliDict._interactive;
    cliDict._version = cliDict._version || function () {
    /*
     *
     * will print version
     */
        console.log(require(__dirname + "/package.json").version);
    };
    cliDict["--version"] = cliDict["--version"] || cliDict._version;
    cliDict["-v"] = cliDict["-v"] || cliDict._version;
    // default to --help command if no arguments are given
    if (process.argv.length <= 2) {
        cliDict._help();
        return;
    }
    if (cliDict[process.argv[2]]) {
        cliDict[process.argv[2]]();
        return;
    }
    cliDict._default();
};

local.fsReadFileOrDefaultSync = function (pathname, type, dflt) {
/*
 * this function will sync-read <pathname> with given <type> and <dflt>
 */
    let fs;
    // do nothing if module not exists
    try {
        fs = require("fs");
        pathname = require("path").resolve(pathname);
    } catch (ignore) {
        return dflt;
    }
    // try to read pathname
    try {
        return (
            type === "json"
            ? JSON.parse(fs.readFileSync(pathname, "utf8"))
            : fs.readFileSync(pathname, type)
        );
    } catch (ignore) {
        return dflt;
    }
};

local.fsWriteFileWithMkdirpSync = function (pathname, data) {
/*
 * this function will sync write <data> to <pathname> with "mkdir -p"
 */
    let fs;
    // do nothing if module not exists
    try {
        fs = require("fs");
        pathname = require("path").resolve(pathname);
    } catch (ignore) {
        return;
    }
    // try to write pathname
    try {
        fs.writeFileSync(pathname, data);
    } catch (ignore) {
        // mkdir -p
        fs.mkdirSync(require("path").dirname(pathname), {
            recursive: true
        });
        // re-write pathname
        fs.writeFileSync(pathname, data);
    }
    console.error("fsWriteFileWithMkdirpSync - " + pathname);
    return true;
};

local.templateRender = function (template, dict, opt = {}, ii = 0) {
/*
 * this function will render <template> with given <dict>
 */
    let argList;
    let getVal;
    let match;
    let renderPartial;
    let rgx;
    let skip;
    let val;
    if (dict === null || dict === undefined) {
        dict = {};
    }
    getVal = function (key) {
        argList = key.split(" ");
        val = dict;
        if (argList[0] === "#this/") {
            return val;
        }
        if (argList[0] === "#ii/") {
            return ii;
        }
        // iteratively lookup nested val in dict
        argList[0].split(".").forEach(function (key) {
            val = val && val[key];
        });
        return val;
    };
    renderPartial = function (match0, helper, key, partial) {
        switch (helper) {
        case "each":
        case "eachTrimEndComma":
            val = getVal(key);
            val = (
                Array.isArray(val)
                ? val.map(function (dict, ii) {
                    // recurse with partial
                    return local.templateRender(partial, dict, opt, ii);
                }).join("")
                : ""
            );
            // remove trailing-comma from last elem
            if (helper === "eachTrimEndComma") {
                val = val.trimEnd().replace((
                    /,$/
                ), "");
            }
            return val;
        case "if":
            partial = partial.split("{{#unless " + key + "}}");
            partial = (
                getVal(key)
                ? partial[0]
                // handle "unless" case
                : partial.slice(1).join("{{#unless " + key + "}}")
            );
            // recurse with partial
            return local.templateRender(partial, dict, opt);
        case "unless":
            return (
                getVal(key)
                ? ""
                // recurse with partial
                : local.templateRender(partial, dict, opt)
            );
        default:
            // recurse with partial
            return match0[0] + local.templateRender(match0.slice(1), dict, opt);
        }
    };
    // render partials
    rgx = (
        /\{\{#(\w+)\u0020([^}]+?)\}\}/g
    );
    template = template || "";
    match = rgx.exec(template);
    while (match) {
        rgx.lastIndex += 1 - match[0].length;
        template = template.replace(
            new RegExp(
                "\\{\\{#(" + match[1] + ") (" + match[2]
                + ")\\}\\}([\\S\\s]*?)\\{\\{/" + match[1] + " " + match[2]
                + "\\}\\}"
            ),
            renderPartial
        );
        match = rgx.exec(template);
    }
    // search for keys in template
    return template.replace((
        /\{\{[^}]+?\}\}/g
    ), function (match0) {
        let markdownToHtml;
        let notHtmlSafe;
        notHtmlSafe = opt.notHtmlSafe;
        try {
            val = getVal(match0.slice(2, -2));
            if (val === undefined) {
                return match0;
            }
            argList.slice(1).forEach(function (fmt, ii, list) {
                switch (fmt) {
                case "*":
                case "+":
                case "-":
                case "/":
                    skip = ii + 1;
                    val = String(
                        fmt === "*"
                        ? Number(val) * Number(list[skip])
                        : fmt === "+"
                        ? Number(val) + Number(list[skip])
                        : fmt === "-"
                        ? Number(val) - Number(list[skip])
                        : Number(val) / Number(list[skip])
                    );
                    break;
                case "alphanumeric":
                    val = val.replace((
                        /\W/g
                    ), "_");
                    break;
                case "decodeURIComponent":
                    val = decodeURIComponent(val);
                    break;
                case "encodeURIComponent":
                    val = encodeURIComponent(val);
                    break;
                case "jsonStringify":
                    val = JSON.stringify(val);
                    break;
                case "jsonStringify4":
                    val = JSON.stringify(val, undefined, 4);
                    break;
                case "markdownSafe":
                    val = val.replace((
                        /`/g
                    ), "'");
                    break;
                case "markdownToHtml":
                    markdownToHtml = true;
                    break;
                case "notHtmlSafe":
                    notHtmlSafe = true;
                    break;
                case "padEnd":
                case "padStart":
                case "replace":
                case "slice":
                    skip = ii + 2;
                    val = String(val)[fmt](
                        list[skip - 1],
                        list[skip].replace("\"\"", "").replace("\"_\"", " ")
                    );
                    break;
                case "truncate":
                    skip = ii + 1;
                    if (val.length > list[skip]) {
                        val = val.slice(
                            0,
                            Math.max(list[skip] - 3, 0)
                        ).trimEnd() + "...";
                    }
                    break;
                // default to String.prototype[fmt]()
                default:
                    if (ii <= skip) {
                        break;
                    }
                    val = val[fmt]();
                }
            });
            val = String(val);
            // default to htmlSafe
            if (!notHtmlSafe) {
                val = val.replace((
                    /&/gu
                ), "&amp;").replace((
                    /"/gu
                ), "&quot;").replace((
                    /'/gu
                ), "&apos;").replace((
                    /</gu
                ), "&lt;").replace((
                    />/gu
                ), "&gt;").replace((
                    /&amp;(amp;|apos;|gt;|lt;|quot;)/igu
                ), "&$1");
            }
            markdownToHtml = (
                markdownToHtml
                && (typeof local.marked === "function" && local.marked)
            );
            if (markdownToHtml) {
                val = markdownToHtml(val).replace((
                    /&amp;(amp;|apos;|gt;|lt;|quot;)/igu
                ), "&$1");
            }
            return val;
        } catch (errCaught) {
            errCaught.message = (
                "templateRender could not render expression "
                + JSON.stringify(match0) + "\n"
            ) + errCaught.message;
            local.assertOrThrow(undefined, errCaught);
        }
    });
};
}());


// run shared js-env code - function
(function () {
let escodegen;
let esprima;
let estraverse;
let esutils;
let process;
// mock builtins
escodegen = {};
esprima = {};
estraverse = {};
esutils = {};
process = (
    local.isBrowser
    ? {
        env: {},
        stdout: {}
    }
    : globalThis.process
);
local.noop(escodegen, esprima, estraverse, esutils);


/*
repo https://github.com/acornjs/acorn/tree/6.4.1
committed 2020-03-09T10:38:41Z
*/


/*
file https://github.com/acornjs/acorn/blob/6.4.1/acorn/dist/acorn.js
*/
// hack-istanbul - inline-require
/* istanbul ignore next */
/* jslint ignore:start */
(function () { let exports, module; exports = module = esprima;
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
  typeof define === 'function' && define.amd ? define(['exports'], factory) :
  (global = global || self, factory(global.acorn = {}));
}(this, function (exports) { 'use strict';

  // Reserved word lists for various dialects of the language

  var reservedWords = {
    3: "abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile",
    5: "class enum extends super const export import",
    6: "enum",
    strict: "implements interface let package private protected public static yield",
    strictBind: "eval arguments"
  };

  // And the keywords

  var ecma5AndLessKeywords = "break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in this";

  var keywords = {
    5: ecma5AndLessKeywords,
    "5module": ecma5AndLessKeywords + " export import",
    6: ecma5AndLessKeywords + " const class extends export import super"
  };

  var keywordRelationalOperator = /^in(stanceof)?$/;

  // ## Character categories

  // Big ugly regular expressions that match characters in the
  // whitespace, identifier, and identifier-start categories. These
  // are only applied when a character is found to actually have a
  // code point above 128.
  // Generated by `bin/generate-identifier-regex.js`.
  var nonASCIIidentifierStartChars = "\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376\u0377\u037a-\u037d\u037f\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u052f\u0531-\u0556\u0559\u0560-\u0588\u05d0-\u05ea\u05ef-\u05f2\u0620-\u064a\u066e\u066f\u0671-\u06d3\u06d5\u06e5\u06e6\u06ee\u06ef\u06fa-\u06fc\u06ff\u0710\u0712-\u072f\u074d-\u07a5\u07b1\u07ca-\u07ea\u07f4\u07f5\u07fa\u0800-\u0815\u081a\u0824\u0828\u0840-\u0858\u0860-\u086a\u08a0-\u08b4\u08b6-\u08bd\u0904-\u0939\u093d\u0950\u0958-\u0961\u0971-\u0980\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bd\u09ce\u09dc\u09dd\u09df-\u09e1\u09f0\u09f1\u09fc\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a59-\u0a5c\u0a5e\u0a72-\u0a74\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abd\u0ad0\u0ae0\u0ae1\u0af9\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3d\u0b5c\u0b5d\u0b5f-\u0b61\u0b71\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bd0\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c39\u0c3d\u0c58-\u0c5a\u0c60\u0c61\u0c80\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0\u0ce1\u0cf1\u0cf2\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d\u0d4e\u0d54-\u0d56\u0d5f-\u0d61\u0d7a-\u0d7f\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0e01-\u0e30\u0e32\u0e33\u0e40-\u0e46\u0e81\u0e82\u0e84\u0e86-\u0e8a\u0e8c-\u0ea3\u0ea5\u0ea7-\u0eb0\u0eb2\u0eb3\u0ebd\u0ec0-\u0ec4\u0ec6\u0edc-\u0edf\u0f00\u0f40-\u0f47\u0f49-\u0f6c\u0f88-\u0f8c\u1000-\u102a\u103f\u1050-\u1055\u105a-\u105d\u1061\u1065\u1066\u106e-\u1070\u1075-\u1081\u108e\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u1380-\u138f\u13a0-\u13f5\u13f8-\u13fd\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f8\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u1820-\u1878\u1880-\u18a8\u18aa\u18b0-\u18f5\u1900-\u191e\u1950-\u196d\u1970-\u1974\u1980-\u19ab\u19b0-\u19c9\u1a00-\u1a16\u1a20-\u1a54\u1aa7\u1b05-\u1b33\u1b45-\u1b4b\u1b83-\u1ba0\u1bae\u1baf\u1bba-\u1be5\u1c00-\u1c23\u1c4d-\u1c4f\u1c5a-\u1c7d\u1c80-\u1c88\u1c90-\u1cba\u1cbd-\u1cbf\u1ce9-\u1cec\u1cee-\u1cf3\u1cf5\u1cf6\u1cfa\u1d00-\u1dbf\u1e00-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u2071\u207f\u2090-\u209c\u2102\u2107\u210a-\u2113\u2115\u2118-\u211d\u2124\u2126\u2128\u212a-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cee\u2cf2\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d80-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303c\u3041-\u3096\u309b-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312f\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fef\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua69d\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua7bf\ua7c2-\ua7c6\ua7f7-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8f2-\ua8f7\ua8fb\ua8fd\ua8fe\ua90a-\ua925\ua930-\ua946\ua960-\ua97c\ua984-\ua9b2\ua9cf\ua9e0-\ua9e4\ua9e6-\ua9ef\ua9fa-\ua9fe\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa60-\uaa76\uaa7a\uaa7e-\uaaaf\uaab1\uaab5\uaab6\uaab9-\uaabd\uaac0\uaac2\uaadb-\uaadd\uaae0-\uaaea\uaaf2-\uaaf4\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uab30-\uab5a\uab5c-\uab67\uab70-\uabe2\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d\ufb1f-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe70-\ufe74\ufe76-\ufefc\uff21-\uff3a\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc";
  var nonASCIIidentifierChars = "\u200c\u200d\xb7\u0300-\u036f\u0387\u0483-\u0487\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u0669\u0670\u06d6-\u06dc\u06df-\u06e4\u06e7\u06e8\u06ea-\u06ed\u06f0-\u06f9\u0711\u0730-\u074a\u07a6-\u07b0\u07c0-\u07c9\u07eb-\u07f3\u07fd\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0859-\u085b\u08d3-\u08e1\u08e3-\u0903\u093a-\u093c\u093e-\u094f\u0951-\u0957\u0962\u0963\u0966-\u096f\u0981-\u0983\u09bc\u09be-\u09c4\u09c7\u09c8\u09cb-\u09cd\u09d7\u09e2\u09e3\u09e6-\u09ef\u09fe\u0a01-\u0a03\u0a3c\u0a3e-\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a66-\u0a71\u0a75\u0a81-\u0a83\u0abc\u0abe-\u0ac5\u0ac7-\u0ac9\u0acb-\u0acd\u0ae2\u0ae3\u0ae6-\u0aef\u0afa-\u0aff\u0b01-\u0b03\u0b3c\u0b3e-\u0b44\u0b47\u0b48\u0b4b-\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b66-\u0b6f\u0b82\u0bbe-\u0bc2\u0bc6-\u0bc8\u0bca-\u0bcd\u0bd7\u0be6-\u0bef\u0c00-\u0c04\u0c3e-\u0c44\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0c66-\u0c6f\u0c81-\u0c83\u0cbc\u0cbe-\u0cc4\u0cc6-\u0cc8\u0cca-\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0ce6-\u0cef\u0d00-\u0d03\u0d3b\u0d3c\u0d3e-\u0d44\u0d46-\u0d48\u0d4a-\u0d4d\u0d57\u0d62\u0d63\u0d66-\u0d6f\u0d82\u0d83\u0dca\u0dcf-\u0dd4\u0dd6\u0dd8-\u0ddf\u0de6-\u0def\u0df2\u0df3\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0e50-\u0e59\u0eb1\u0eb4-\u0ebc\u0ec8-\u0ecd\u0ed0-\u0ed9\u0f18\u0f19\u0f20-\u0f29\u0f35\u0f37\u0f39\u0f3e\u0f3f\u0f71-\u0f84\u0f86\u0f87\u0f8d-\u0f97\u0f99-\u0fbc\u0fc6\u102b-\u103e\u1040-\u1049\u1056-\u1059\u105e-\u1060\u1062-\u1064\u1067-\u106d\u1071-\u1074\u1082-\u108d\u108f-\u109d\u135d-\u135f\u1369-\u1371\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b4-\u17d3\u17dd\u17e0-\u17e9\u180b-\u180d\u1810-\u1819\u18a9\u1920-\u192b\u1930-\u193b\u1946-\u194f\u19d0-\u19da\u1a17-\u1a1b\u1a55-\u1a5e\u1a60-\u1a7c\u1a7f-\u1a89\u1a90-\u1a99\u1ab0-\u1abd\u1b00-\u1b04\u1b34-\u1b44\u1b50-\u1b59\u1b6b-\u1b73\u1b80-\u1b82\u1ba1-\u1bad\u1bb0-\u1bb9\u1be6-\u1bf3\u1c24-\u1c37\u1c40-\u1c49\u1c50-\u1c59\u1cd0-\u1cd2\u1cd4-\u1ce8\u1ced\u1cf4\u1cf7-\u1cf9\u1dc0-\u1df9\u1dfb-\u1dff\u203f\u2040\u2054\u20d0-\u20dc\u20e1\u20e5-\u20f0\u2cef-\u2cf1\u2d7f\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua620-\ua629\ua66f\ua674-\ua67d\ua69e\ua69f\ua6f0\ua6f1\ua802\ua806\ua80b\ua823-\ua827\ua880\ua881\ua8b4-\ua8c5\ua8d0-\ua8d9\ua8e0-\ua8f1\ua8ff-\ua909\ua926-\ua92d\ua947-\ua953\ua980-\ua983\ua9b3-\ua9c0\ua9d0-\ua9d9\ua9e5\ua9f0-\ua9f9\uaa29-\uaa36\uaa43\uaa4c\uaa4d\uaa50-\uaa59\uaa7b-\uaa7d\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uaaeb-\uaaef\uaaf5\uaaf6\uabe3-\uabea\uabec\uabed\uabf0-\uabf9\ufb1e\ufe00-\ufe0f\ufe20-\ufe2f\ufe33\ufe34\ufe4d-\ufe4f\uff10-\uff19\uff3f";

  var nonASCIIidentifierStart = new RegExp("[" + nonASCIIidentifierStartChars + "]");
  var nonASCIIidentifier = new RegExp("[" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + "]");

  nonASCIIidentifierStartChars = nonASCIIidentifierChars = null;

  // These are a run-length and offset encoded representation of the
  // >0xffff code points that are a valid part of identifiers. The
  // offset starts at 0x10000, and each pair of numbers represents an
  // offset to the next range, and then a size of the range. They were
  // generated by bin/generate-identifier-regex.js

  // eslint-disable-next-line comma-spacing
  var astralIdentifierStartCodes = [0,11,2,25,2,18,2,1,2,14,3,13,35,122,70,52,268,28,4,48,48,31,14,29,6,37,11,29,3,35,5,7,2,4,43,157,19,35,5,35,5,39,9,51,157,310,10,21,11,7,153,5,3,0,2,43,2,1,4,0,3,22,11,22,10,30,66,18,2,1,11,21,11,25,71,55,7,1,65,0,16,3,2,2,2,28,43,28,4,28,36,7,2,27,28,53,11,21,11,18,14,17,111,72,56,50,14,50,14,35,477,28,11,0,9,21,155,22,13,52,76,44,33,24,27,35,30,0,12,34,4,0,13,47,15,3,22,0,2,0,36,17,2,24,85,6,2,0,2,3,2,14,2,9,8,46,39,7,3,1,3,21,2,6,2,1,2,4,4,0,19,0,13,4,159,52,19,3,21,0,33,47,21,1,2,0,185,46,42,3,37,47,21,0,60,42,14,0,72,26,230,43,117,63,32,0,161,7,3,38,17,0,2,0,29,0,11,39,8,0,22,0,12,45,20,0,35,56,264,8,2,36,18,0,50,29,113,6,2,1,2,37,22,0,26,5,2,1,2,31,15,0,328,18,270,921,103,110,18,195,2749,1070,4050,582,8634,568,8,30,114,29,19,47,17,3,32,20,6,18,689,63,129,74,6,0,67,12,65,1,2,0,29,6135,9,754,9486,286,50,2,18,3,9,395,2309,106,6,12,4,8,8,9,5991,84,2,70,2,1,3,0,3,1,3,3,2,11,2,0,2,6,2,64,2,3,3,7,2,6,2,27,2,3,2,4,2,0,4,6,2,339,3,24,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,7,2357,44,11,6,17,0,370,43,1301,196,60,67,8,0,1205,3,2,26,2,1,2,0,3,0,2,9,2,3,2,0,2,0,7,0,5,0,2,0,2,0,2,2,2,1,2,0,3,0,2,0,2,0,2,0,2,0,2,1,2,0,3,3,2,6,2,3,2,3,2,0,2,9,2,16,6,2,2,4,2,16,4421,42710,42,4148,12,221,3,5761,15,7472,3104,541];

  // eslint-disable-next-line comma-spacing
  var astralIdentifierCodes = [509,0,227,0,150,4,294,9,1368,2,2,1,6,3,41,2,5,0,166,1,574,3,9,9,525,10,176,2,54,14,32,9,16,3,46,10,54,9,7,2,37,13,2,9,6,1,45,0,13,2,49,13,9,3,4,9,83,11,7,0,161,11,6,9,7,3,56,1,2,6,3,1,3,2,10,0,11,1,3,6,4,4,193,17,10,9,5,0,82,19,13,9,214,6,3,8,28,1,83,16,16,9,82,12,9,9,84,14,5,9,243,14,166,9,232,6,3,6,4,0,29,9,41,6,2,3,9,0,10,10,47,15,406,7,2,7,17,9,57,21,2,13,123,5,4,0,2,1,2,6,2,0,9,9,49,4,2,1,2,4,9,9,330,3,19306,9,135,4,60,6,26,9,1014,0,2,54,8,3,19723,1,5319,4,4,5,9,7,3,6,31,3,149,2,1418,49,513,54,5,49,9,0,15,0,23,4,2,14,1361,6,2,16,3,6,2,1,2,4,262,6,10,9,419,13,1495,6,110,6,6,9,792487,239];

  // This has a complexity linear to the value of the code. The
  // assumption is that looking up astral identifier characters is
  // rare.
  function isInAstralSet(code, set) {
    var pos = 0x10000;
    for (var i = 0; i < set.length; i += 2) {
      pos += set[i];
      if (pos > code) { return false }
      pos += set[i + 1];
      if (pos >= code) { return true }
    }
  }

  // Test whether a given character code starts an identifier.

  function isIdentifierStart(code, astral) {
    if (code < 65) { return code === 36 }
    if (code < 91) { return true }
    if (code < 97) { return code === 95 }
    if (code < 123) { return true }
    if (code <= 0xffff) { return code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code)) }
    if (astral === false) { return false }
    return isInAstralSet(code, astralIdentifierStartCodes)
  }

  // Test whether a given character is part of an identifier.

  function isIdentifierChar(code, astral) {
    if (code < 48) { return code === 36 }
    if (code < 58) { return true }
    if (code < 65) { return false }
    if (code < 91) { return true }
    if (code < 97) { return code === 95 }
    if (code < 123) { return true }
    if (code <= 0xffff) { return code >= 0xaa && nonASCIIidentifier.test(String.fromCharCode(code)) }
    if (astral === false) { return false }
    return isInAstralSet(code, astralIdentifierStartCodes) || isInAstralSet(code, astralIdentifierCodes)
  }

  // ## Token types

  // The assignment of fine-grained, information-carrying type objects
  // allows the tokenizer to store the information it has about a
  // token in a way that is very cheap for the parser to look up.

  // All token type variables start with an underscore, to make them
  // easy to recognize.

  // The `beforeExpr` property is used to disambiguate between regular
  // expressions and divisions. It is set on all token types that can
  // be followed by an expression (thus, a slash after them would be a
  // regular expression).
  //
  // The `startsExpr` property is used to check if the token ends a
  // `yield` expression. It is set on all token types that either can
  // directly start an expression (like a quotation mark) or can
  // continue an expression (like the body of a string).
  //
  // `isLoop` marks a keyword as starting a loop, which is important
  // to know when parsing a label, in order to allow or disallow
  // continue jumps to that label.

  var TokenType = function TokenType(label, conf) {
    if ( conf === void 0 ) conf = {};

    this.label = label;
    this.keyword = conf.keyword;
    this.beforeExpr = !!conf.beforeExpr;
    this.startsExpr = !!conf.startsExpr;
    this.isLoop = !!conf.isLoop;
    this.isAssign = !!conf.isAssign;
    this.prefix = !!conf.prefix;
    this.postfix = !!conf.postfix;
    this.binop = conf.binop || null;
    this.updateContext = null;
  };

  function binop(name, prec) {
    return new TokenType(name, {beforeExpr: true, binop: prec})
  }
  var beforeExpr = {beforeExpr: true}, startsExpr = {startsExpr: true};

  // Map keyword names to token types.

  var keywords$1 = {};

  // Succinct definitions of keyword token types
  function kw(name, options) {
    if ( options === void 0 ) options = {};

    options.keyword = name;
    return keywords$1[name] = new TokenType(name, options)
  }

  var types = {
    num: new TokenType("num", startsExpr),
    regexp: new TokenType("regexp", startsExpr),
    string: new TokenType("string", startsExpr),
    name: new TokenType("name", startsExpr),
    eof: new TokenType("eof"),

    // Punctuation token types.
    bracketL: new TokenType("[", {beforeExpr: true, startsExpr: true}),
    bracketR: new TokenType("]"),
    braceL: new TokenType("{", {beforeExpr: true, startsExpr: true}),
    braceR: new TokenType("}"),
    parenL: new TokenType("(", {beforeExpr: true, startsExpr: true}),
    parenR: new TokenType(")"),
    comma: new TokenType(",", beforeExpr),
    semi: new TokenType(";", beforeExpr),
    colon: new TokenType(":", beforeExpr),
    dot: new TokenType("."),
    question: new TokenType("?", beforeExpr),
    arrow: new TokenType("=>", beforeExpr),
    template: new TokenType("template"),
    invalidTemplate: new TokenType("invalidTemplate"),
    ellipsis: new TokenType("...", beforeExpr),
    backQuote: new TokenType("`", startsExpr),
    dollarBraceL: new TokenType("${", {beforeExpr: true, startsExpr: true}),

    // Operators. These carry several kinds of properties to help the
    // parser use them properly (the presence of these properties is
    // what categorizes them as operators).
    //
    // `binop`, when present, specifies that this operator is a binary
    // operator, and will refer to its precedence.
    //
    // `prefix` and `postfix` mark the operator as a prefix or postfix
    // unary operator.
    //
    // `isAssign` marks all of `=`, `+=`, `-=` etcetera, which act as
    // binary operators with a very low precedence, that should result
    // in AssignmentExpression nodes.

    eq: new TokenType("=", {beforeExpr: true, isAssign: true}),
    assign: new TokenType("_=", {beforeExpr: true, isAssign: true}),
    incDec: new TokenType("++/--", {prefix: true, postfix: true, startsExpr: true}),
    prefix: new TokenType("!/~", {beforeExpr: true, prefix: true, startsExpr: true}),
    logicalOR: binop("||", 1),
    logicalAND: binop("&&", 2),
    bitwiseOR: binop("|", 3),
    bitwiseXOR: binop("^", 4),
    bitwiseAND: binop("&", 5),
    equality: binop("==/!=/===/!==", 6),
    relational: binop("</>/<=/>=", 7),
    bitShift: binop("<</>>/>>>", 8),
    plusMin: new TokenType("+/-", {beforeExpr: true, binop: 9, prefix: true, startsExpr: true}),
    modulo: binop("%", 10),
    star: binop("*", 10),
    slash: binop("/", 10),
    starstar: new TokenType("**", {beforeExpr: true}),

    // Keyword token types.
    _break: kw("break"),
    _case: kw("case", beforeExpr),
    _catch: kw("catch"),
    _continue: kw("continue"),
    _debugger: kw("debugger"),
    _default: kw("default", beforeExpr),
    _do: kw("do", {isLoop: true, beforeExpr: true}),
    _else: kw("else", beforeExpr),
    _finally: kw("finally"),
    _for: kw("for", {isLoop: true}),
    _function: kw("function", startsExpr),
    _if: kw("if"),
    _return: kw("return", beforeExpr),
    _switch: kw("switch"),
    _throw: kw("throw", beforeExpr),
    _try: kw("try"),
    _var: kw("var"),
    _const: kw("const"),
    _while: kw("while", {isLoop: true}),
    _with: kw("with"),
    _new: kw("new", {beforeExpr: true, startsExpr: true}),
    _this: kw("this", startsExpr),
    _super: kw("super", startsExpr),
    _class: kw("class", startsExpr),
    _extends: kw("extends", beforeExpr),
    _export: kw("export"),
    _import: kw("import", startsExpr),
    _null: kw("null", startsExpr),
    _true: kw("true", startsExpr),
    _false: kw("false", startsExpr),
    _in: kw("in", {beforeExpr: true, binop: 7}),
    _instanceof: kw("instanceof", {beforeExpr: true, binop: 7}),
    _typeof: kw("typeof", {beforeExpr: true, prefix: true, startsExpr: true}),
    _void: kw("void", {beforeExpr: true, prefix: true, startsExpr: true}),
    _delete: kw("delete", {beforeExpr: true, prefix: true, startsExpr: true})
  };

  // Matches a whole line break (where CRLF is considered a single
  // line break). Used to count lines.

  var lineBreak = /\r\n?|\n|\u2028|\u2029/;
  var lineBreakG = new RegExp(lineBreak.source, "g");

  function isNewLine(code, ecma2019String) {
    return code === 10 || code === 13 || (!ecma2019String && (code === 0x2028 || code === 0x2029))
  }

  var nonASCIIwhitespace = /[\u1680\u2000-\u200a\u202f\u205f\u3000\ufeff]/;

  var skipWhiteSpace = /(?:\s|\/\/.*|\/\*[^]*?\*\/)*/g;

  var ref = Object.prototype;
  var hasOwnProperty = ref.hasOwnProperty;
  var toString = ref.toString;

  // Checks if an object has a property.

  function has(obj, propName) {
    return hasOwnProperty.call(obj, propName)
  }

  var isArray = Array.isArray || (function (obj) { return (
    toString.call(obj) === "[object Array]"
  ); });

  function wordsRegexp(words) {
    return new RegExp("^(?:" + words.replace(/ /g, "|") + ")$")
  }

  // These are used when `options.locations` is on, for the
  // `startLoc` and `endLoc` properties.

  var Position = function Position(line, col) {
    this.line = line;
    this.column = col;
  };

  Position.prototype.offset = function offset (n) {
    return new Position(this.line, this.column + n)
  };

  var SourceLocation = function SourceLocation(p, start, end) {
    this.start = start;
    this.end = end;
    if (p.sourceFile !== null) { this.source = p.sourceFile; }
  };

  // The `getLineInfo` function is mostly useful when the
  // `locations` option is off (for performance reasons) and you
  // want to find the line/column position for a given character
  // offset. `input` should be the code string that the offset refers
  // into.

  function getLineInfo(input, offset) {
    for (var line = 1, cur = 0;;) {
      lineBreakG.lastIndex = cur;
      var match = lineBreakG.exec(input);
      if (match && match.index < offset) {
        ++line;
        cur = match.index + match[0].length;
      } else {
        return new Position(line, offset - cur)
      }
    }
  }

  // A second optional argument can be given to further configure
  // the parser process. These options are recognized:

  var defaultOptions = {
    // `ecmaVersion` indicates the ECMAScript version to parse. Must be
    // either 3, 5, 6 (2015), 7 (2016), 8 (2017), 9 (2018), or 10
    // (2019). This influences support for strict mode, the set of
    // reserved words, and support for new syntax features. The default
    // is 9.
    ecmaVersion: 9,
    // `sourceType` indicates the mode the code should be parsed in.
    // Can be either `"script"` or `"module"`. This influences global
    // strict mode and parsing of `import` and `export` declarations.
    sourceType: "script",
    // `onInsertedSemicolon` can be a callback that will be called
    // when a semicolon is automatically inserted. It will be passed
    // the position of the comma as an offset, and if `locations` is
    // enabled, it is given the location as a `{line, column}` object
    // as second argument.
    onInsertedSemicolon: null,
    // `onTrailingComma` is similar to `onInsertedSemicolon`, but for
    // trailing commas.
    onTrailingComma: null,
    // By default, reserved words are only enforced if ecmaVersion >= 5.
    // Set `allowReserved` to a boolean value to explicitly turn this on
    // an off. When this option has the value "never", reserved words
    // and keywords can also not be used as property names.
    allowReserved: null,
    // When enabled, a return at the top level is not considered an
    // error.
    allowReturnOutsideFunction: false,
    // When enabled, import/export statements are not constrained to
    // appearing at the top of the program.
    allowImportExportEverywhere: false,
    // When enabled, await identifiers are allowed to appear at the top-level scope,
    // but they are still not allowed in non-async functions.
    allowAwaitOutsideFunction: false,
    // When enabled, hashbang directive in the beginning of file
    // is allowed and treated as a line comment.
    allowHashBang: false,
    // When `locations` is on, `loc` properties holding objects with
    // `start` and `end` properties in `{line, column}` form (with
    // line being 1-based and column 0-based) will be attached to the
    // nodes.
    locations: false,
    // A function can be passed as `onToken` option, which will
    // cause Acorn to call that function with object in the same
    // format as tokens returned from `tokenizer().getToken()`. Note
    // that you are not allowed to call the parser from the
    // callback—that will corrupt its internal state.
    onToken: null,
    // A function can be passed as `onComment` option, which will
    // cause Acorn to call that function with `(block, text, start,
    // end)` parameters whenever a comment is skipped. `block` is a
    // boolean indicating whether this is a block (`/* */`) comment,
    // `text` is the content of the comment, and `start` and `end` are
    // character offsets that denote the start and end of the comment.
    // When the `locations` option is on, two more parameters are
    // passed, the full `{line, column}` locations of the start and
    // end of the comments. Note that you are not allowed to call the
    // parser from the callback—that will corrupt its internal state.
    onComment: null,
    // Nodes have their start and end characters offsets recorded in
    // `start` and `end` properties (directly on the node, rather than
    // the `loc` object, which holds line/column data. To also add a
    // [semi-standardized][range] `range` property holding a `[start,
    // end]` array with the same numbers, set the `ranges` option to
    // `true`.
    //
    // [range]: https://bugzilla.mozilla.org/show_bug.cgi?id=745678
    ranges: false,
    // It is possible to parse multiple files into a single AST by
    // passing the tree produced by parsing the first file as
    // `program` option in subsequent parses. This will add the
    // toplevel forms of the parsed file to the `Program` (top) node
    // of an existing parse tree.
    program: null,
    // When `locations` is on, you can pass this to record the source
    // file in every node's `loc` object.
    sourceFile: null,
    // This value, if given, is stored in every node, whether
    // `locations` is on or off.
    directSourceFile: null,
    // When enabled, parenthesized expressions are represented by
    // (non-standard) ParenthesizedExpression nodes
    preserveParens: false
  };

  // Interpret and default an options object

  function getOptions(opts) {
    var options = {};

    for (var opt in defaultOptions)
      { options[opt] = opts && has(opts, opt) ? opts[opt] : defaultOptions[opt]; }

    if (options.ecmaVersion >= 2015)
      { options.ecmaVersion -= 2009; }

    if (options.allowReserved == null)
      { options.allowReserved = options.ecmaVersion < 5; }

    if (isArray(options.onToken)) {
      var tokens = options.onToken;
      options.onToken = function (token) { return tokens.push(token); };
    }
    if (isArray(options.onComment))
      { options.onComment = pushComment(options, options.onComment); }

    return options
  }

  function pushComment(options, array) {
    return function(block, text, start, end, startLoc, endLoc) {
      var comment = {
        type: block ? "Block" : "Line",
        value: text,
        start: start,
        end: end
      };
      if (options.locations)
        { comment.loc = new SourceLocation(this, startLoc, endLoc); }
      if (options.ranges)
        { comment.range = [start, end]; }
      array.push(comment);
    }
  }

  // Each scope gets a bitset that may contain these flags
  var
      SCOPE_TOP = 1,
      SCOPE_FUNCTION = 2,
      SCOPE_VAR = SCOPE_TOP | SCOPE_FUNCTION,
      SCOPE_ASYNC = 4,
      SCOPE_GENERATOR = 8,
      SCOPE_ARROW = 16,
      SCOPE_SIMPLE_CATCH = 32,
      SCOPE_SUPER = 64,
      SCOPE_DIRECT_SUPER = 128;

  function functionFlags(async, generator) {
    return SCOPE_FUNCTION | (async ? SCOPE_ASYNC : 0) | (generator ? SCOPE_GENERATOR : 0)
  }

  // Used in checkLVal and declareName to determine the type of a binding
  var
      BIND_NONE = 0, // Not a binding
      BIND_VAR = 1, // Var-style binding
      BIND_LEXICAL = 2, // Let- or const-style binding
      BIND_FUNCTION = 3, // Function declaration
      BIND_SIMPLE_CATCH = 4, // Simple (identifier pattern) catch binding
      BIND_OUTSIDE = 5; // Special case for function names as bound inside the function

  var Parser = function Parser(options, input, startPos) {
    this.options = options = getOptions(options);
    this.sourceFile = options.sourceFile;
    this.keywords = wordsRegexp(keywords[options.ecmaVersion >= 6 ? 6 : options.sourceType === "module" ? "5module" : 5]);
    var reserved = "";
    if (options.allowReserved !== true) {
      for (var v = options.ecmaVersion;; v--)
        { if (reserved = reservedWords[v]) { break } }
      if (options.sourceType === "module") { reserved += " await"; }
    }
    this.reservedWords = wordsRegexp(reserved);
    var reservedStrict = (reserved ? reserved + " " : "") + reservedWords.strict;
    this.reservedWordsStrict = wordsRegexp(reservedStrict);
    this.reservedWordsStrictBind = wordsRegexp(reservedStrict + " " + reservedWords.strictBind);
    this.input = String(input);

    // Used to signal to callers of `readWord1` whether the word
    // contained any escape sequences. This is needed because words with
    // escape sequences must not be interpreted as keywords.
    this.containsEsc = false;

    // Set up token state

    // The current position of the tokenizer in the input.
    if (startPos) {
      this.pos = startPos;
      this.lineStart = this.input.lastIndexOf("\n", startPos - 1) + 1;
      this.curLine = this.input.slice(0, this.lineStart).split(lineBreak).length;
    } else {
      this.pos = this.lineStart = 0;
      this.curLine = 1;
    }

    // Properties of the current token:
    // Its type
    this.type = types.eof;
    // For tokens that include more information than their type, the value
    this.value = null;
    // Its start and end offset
    this.start = this.end = this.pos;
    // And, if locations are used, the {line, column} object
    // corresponding to those offsets
    this.startLoc = this.endLoc = this.curPosition();

    // Position information for the previous token
    this.lastTokEndLoc = this.lastTokStartLoc = null;
    this.lastTokStart = this.lastTokEnd = this.pos;

    // The context stack is used to superficially track syntactic
    // context to predict whether a regular expression is allowed in a
    // given position.
    this.context = this.initialContext();
    this.exprAllowed = true;

    // Figure out if it's a module code.
    this.inModule = options.sourceType === "module";
    this.strict = this.inModule || this.strictDirective(this.pos);

    // Used to signify the start of a potential arrow function
    this.potentialArrowAt = -1;

    // Positions to delayed-check that yield/await does not exist in default parameters.
    this.yieldPos = this.awaitPos = this.awaitIdentPos = 0;
    // Labels in scope.
    this.labels = [];
    // Thus-far undefined exports.
    this.undefinedExports = {};

    // If enabled, skip leading hashbang line.
    if (this.pos === 0 && options.allowHashBang && this.input.slice(0, 2) === "#!")
      { this.skipLineComment(2); }

    // Scope tracking for duplicate variable names (see scope.js)
    this.scopeStack = [];
    this.enterScope(SCOPE_TOP);

    // For RegExp validation
    this.regexpState = null;
  };

  var prototypeAccessors = { inFunction: { configurable: true },inGenerator: { configurable: true },inAsync: { configurable: true },allowSuper: { configurable: true },allowDirectSuper: { configurable: true },treatFunctionsAsVar: { configurable: true } };

  Parser.prototype.parse = function parse () {
    var node = this.options.program || this.startNode();
    this.nextToken();
    return this.parseTopLevel(node)
  };

  prototypeAccessors.inFunction.get = function () { return (this.currentVarScope().flags & SCOPE_FUNCTION) > 0 };
  prototypeAccessors.inGenerator.get = function () { return (this.currentVarScope().flags & SCOPE_GENERATOR) > 0 };
  prototypeAccessors.inAsync.get = function () { return (this.currentVarScope().flags & SCOPE_ASYNC) > 0 };
  prototypeAccessors.allowSuper.get = function () { return (this.currentThisScope().flags & SCOPE_SUPER) > 0 };
  prototypeAccessors.allowDirectSuper.get = function () { return (this.currentThisScope().flags & SCOPE_DIRECT_SUPER) > 0 };
  prototypeAccessors.treatFunctionsAsVar.get = function () { return this.treatFunctionsAsVarInScope(this.currentScope()) };

  // Switch to a getter for 7.0.0.
  Parser.prototype.inNonArrowFunction = function inNonArrowFunction () { return (this.currentThisScope().flags & SCOPE_FUNCTION) > 0 };

  Parser.extend = function extend () {
      var plugins = [], len = arguments.length;
      while ( len-- ) plugins[ len ] = arguments[ len ];

    var cls = this;
    for (var i = 0; i < plugins.length; i++) { cls = plugins[i](cls); }
    return cls
  };

  Parser.parse = function parse (input, options) {
    return new this(options, input).parse()
  };

  Parser.parseExpressionAt = function parseExpressionAt (input, pos, options) {
    var parser = new this(options, input, pos);
    parser.nextToken();
    return parser.parseExpression()
  };

  Parser.tokenizer = function tokenizer (input, options) {
    return new this(options, input)
  };

  Object.defineProperties( Parser.prototype, prototypeAccessors );

  var pp = Parser.prototype;

  // ## Parser utilities

  var literal = /^(?:'((?:\\.|[^'])*?)'|"((?:\\.|[^"])*?)")/;
  pp.strictDirective = function(start) {
    for (;;) {
      // Try to find string literal.
      skipWhiteSpace.lastIndex = start;
      start += skipWhiteSpace.exec(this.input)[0].length;
      var match = literal.exec(this.input.slice(start));
      if (!match) { return false }
      if ((match[1] || match[2]) === "use strict") { return true }
      start += match[0].length;

      // Skip semicolon, if any.
      skipWhiteSpace.lastIndex = start;
      start += skipWhiteSpace.exec(this.input)[0].length;
      if (this.input[start] === ";")
        { start++; }
    }
  };

  // Predicate that tests whether the next token is of the given
  // type, and if yes, consumes it as a side effect.

  pp.eat = function(type) {
    if (this.type === type) {
      this.next();
      return true
    } else {
      return false
    }
  };

  // Tests whether parsed token is a contextual keyword.

  pp.isContextual = function(name) {
    return this.type === types.name && this.value === name && !this.containsEsc
  };

  // Consumes contextual keyword if possible.

  pp.eatContextual = function(name) {
    if (!this.isContextual(name)) { return false }
    this.next();
    return true
  };

  // Asserts that following token is given contextual keyword.

  pp.expectContextual = function(name) {
    if (!this.eatContextual(name)) { this.unexpected(); }
  };

  // Test whether a semicolon can be inserted at the current position.

  pp.canInsertSemicolon = function() {
    return this.type === types.eof ||
      this.type === types.braceR ||
      lineBreak.test(this.input.slice(this.lastTokEnd, this.start))
  };

  pp.insertSemicolon = function() {
    if (this.canInsertSemicolon()) {
      if (this.options.onInsertedSemicolon)
        { this.options.onInsertedSemicolon(this.lastTokEnd, this.lastTokEndLoc); }
      return true
    }
  };

  // Consume a semicolon, or, failing that, see if we are allowed to
  // pretend that there is a semicolon at this position.

  pp.semicolon = function() {
    if (!this.eat(types.semi) && !this.insertSemicolon()) { this.unexpected(); }
  };

  pp.afterTrailingComma = function(tokType, notNext) {
    if (this.type === tokType) {
      if (this.options.onTrailingComma)
        { this.options.onTrailingComma(this.lastTokStart, this.lastTokStartLoc); }
      if (!notNext)
        { this.next(); }
      return true
    }
  };

  // Expect a token of a given type. If found, consume it, otherwise,
  // raise an unexpected token error.

  pp.expect = function(type) {
    this.eat(type) || this.unexpected();
  };

  // Raise an unexpected token error.

  pp.unexpected = function(pos) {
    this.raise(pos != null ? pos : this.start, "Unexpected token");
  };

  function DestructuringErrors() {
    this.shorthandAssign =
    this.trailingComma =
    this.parenthesizedAssign =
    this.parenthesizedBind =
    this.doubleProto =
      -1;
  }

  pp.checkPatternErrors = function(refDestructuringErrors, isAssign) {
    if (!refDestructuringErrors) { return }
    if (refDestructuringErrors.trailingComma > -1)
      { this.raiseRecoverable(refDestructuringErrors.trailingComma, "Comma is not permitted after the rest element"); }
    var parens = isAssign ? refDestructuringErrors.parenthesizedAssign : refDestructuringErrors.parenthesizedBind;
    if (parens > -1) { this.raiseRecoverable(parens, "Parenthesized pattern"); }
  };

  pp.checkExpressionErrors = function(refDestructuringErrors, andThrow) {
    if (!refDestructuringErrors) { return false }
    var shorthandAssign = refDestructuringErrors.shorthandAssign;
    var doubleProto = refDestructuringErrors.doubleProto;
    if (!andThrow) { return shorthandAssign >= 0 || doubleProto >= 0 }
    if (shorthandAssign >= 0)
      { this.raise(shorthandAssign, "Shorthand property assignments are valid only in destructuring patterns"); }
    if (doubleProto >= 0)
      { this.raiseRecoverable(doubleProto, "Redefinition of __proto__ property"); }
  };

  pp.checkYieldAwaitInDefaultParams = function() {
    if (this.yieldPos && (!this.awaitPos || this.yieldPos < this.awaitPos))
      { this.raise(this.yieldPos, "Yield expression cannot be a default value"); }
    if (this.awaitPos)
      { this.raise(this.awaitPos, "Await expression cannot be a default value"); }
  };

  pp.isSimpleAssignTarget = function(expr) {
    if (expr.type === "ParenthesizedExpression")
      { return this.isSimpleAssignTarget(expr.expression) }
    return expr.type === "Identifier" || expr.type === "MemberExpression"
  };

  var pp$1 = Parser.prototype;

  // ### Statement parsing

  // Parse a program. Initializes the parser, reads any number of
  // statements, and wraps them in a Program node.  Optionally takes a
  // `program` argument.  If present, the statements will be appended
  // to its body instead of creating a new node.

  pp$1.parseTopLevel = function(node) {
    var exports = {};
    if (!node.body) { node.body = []; }
    while (this.type !== types.eof) {
      var stmt = this.parseStatement(null, true, exports);
      node.body.push(stmt);
    }
    if (this.inModule)
      { for (var i = 0, list = Object.keys(this.undefinedExports); i < list.length; i += 1)
        {
          var name = list[i];

          this.raiseRecoverable(this.undefinedExports[name].start, ("Export '" + name + "' is not defined"));
        } }
    this.adaptDirectivePrologue(node.body);
    this.next();
    node.sourceType = this.options.sourceType;
    return this.finishNode(node, "Program")
  };

  var loopLabel = {kind: "loop"}, switchLabel = {kind: "switch"};

  pp$1.isLet = function(context) {
    if (this.options.ecmaVersion < 6 || !this.isContextual("let")) { return false }
    skipWhiteSpace.lastIndex = this.pos;
    var skip = skipWhiteSpace.exec(this.input);
    var next = this.pos + skip[0].length, nextCh = this.input.charCodeAt(next);
    // For ambiguous cases, determine if a LexicalDeclaration (or only a
    // Statement) is allowed here. If context is not empty then only a Statement
    // is allowed. However, `let [` is an explicit negative lookahead for
    // ExpressionStatement, so special-case it first.
    if (nextCh === 91) { return true } // '['
    if (context) { return false }

    if (nextCh === 123) { return true } // '{'
    if (isIdentifierStart(nextCh, true)) {
      var pos = next + 1;
      while (isIdentifierChar(this.input.charCodeAt(pos), true)) { ++pos; }
      var ident = this.input.slice(next, pos);
      if (!keywordRelationalOperator.test(ident)) { return true }
    }
    return false
  };

  // check 'async [no LineTerminator here] function'
  // - 'async /*foo*/ function' is OK.
  // - 'async /*\n*/ function' is invalid.
  pp$1.isAsyncFunction = function() {
    if (this.options.ecmaVersion < 8 || !this.isContextual("async"))
      { return false }

    skipWhiteSpace.lastIndex = this.pos;
    var skip = skipWhiteSpace.exec(this.input);
    var next = this.pos + skip[0].length;
    return !lineBreak.test(this.input.slice(this.pos, next)) &&
      this.input.slice(next, next + 8) === "function" &&
      (next + 8 === this.input.length || !isIdentifierChar(this.input.charAt(next + 8)))
  };

  // Parse a single statement.
  //
  // If expecting a statement and finding a slash operator, parse a
  // regular expression literal. This is to handle cases like
  // `if (foo) /blah/.exec(foo)`, where looking at the previous token
  // does not help.

  pp$1.parseStatement = function(context, topLevel, exports) {
    var starttype = this.type, node = this.startNode(), kind;

    if (this.isLet(context)) {
      starttype = types._var;
      kind = "let";
    }

    // Most types of statements are recognized by the keyword they
    // start with. Many are trivial to parse, some require a bit of
    // complexity.

    switch (starttype) {
    case types._break: case types._continue: return this.parseBreakContinueStatement(node, starttype.keyword)
    case types._debugger: return this.parseDebuggerStatement(node)
    case types._do: return this.parseDoStatement(node)
    case types._for: return this.parseForStatement(node)
    case types._function:
      // Function as sole body of either an if statement or a labeled statement
      // works, but not when it is part of a labeled statement that is the sole
      // body of an if statement.
      if ((context && (this.strict || context !== "if" && context !== "label")) && this.options.ecmaVersion >= 6) { this.unexpected(); }
      return this.parseFunctionStatement(node, false, !context)
    case types._class:
      if (context) { this.unexpected(); }
      return this.parseClass(node, true)
    case types._if: return this.parseIfStatement(node)
    case types._return: return this.parseReturnStatement(node)
    case types._switch: return this.parseSwitchStatement(node)
    case types._throw: return this.parseThrowStatement(node)
    case types._try: return this.parseTryStatement(node)
    case types._const: case types._var:
      kind = kind || this.value;
      if (context && kind !== "var") { this.unexpected(); }
      return this.parseVarStatement(node, kind)
    case types._while: return this.parseWhileStatement(node)
    case types._with: return this.parseWithStatement(node)
    case types.braceL: return this.parseBlock(true, node)
    case types.semi: return this.parseEmptyStatement(node)
    case types._export:
    case types._import:
      if (this.options.ecmaVersion > 10 && starttype === types._import) {
        skipWhiteSpace.lastIndex = this.pos;
        var skip = skipWhiteSpace.exec(this.input);
        var next = this.pos + skip[0].length, nextCh = this.input.charCodeAt(next);
        if (nextCh === 40) // '('
          { return this.parseExpressionStatement(node, this.parseExpression()) }
      }

      if (!this.options.allowImportExportEverywhere) {
        if (!topLevel)
          { this.raise(this.start, "'import' and 'export' may only appear at the top level"); }
        if (!this.inModule)
          { this.raise(this.start, "'import' and 'export' may appear only with 'sourceType: module'"); }
      }
      return starttype === types._import ? this.parseImport(node) : this.parseExport(node, exports)

      // If the statement does not start with a statement keyword or a
      // brace, it's an ExpressionStatement or LabeledStatement. We
      // simply start parsing an expression, and afterwards, if the
      // next token is a colon and the expression was a simple
      // Identifier node, we switch to interpreting it as a label.
    default:
      if (this.isAsyncFunction()) {
        if (context) { this.unexpected(); }
        this.next();
        return this.parseFunctionStatement(node, true, !context)
      }

      var maybeName = this.value, expr = this.parseExpression();
      if (starttype === types.name && expr.type === "Identifier" && this.eat(types.colon))
        { return this.parseLabeledStatement(node, maybeName, expr, context) }
      else { return this.parseExpressionStatement(node, expr) }
    }
  };

  pp$1.parseBreakContinueStatement = function(node, keyword) {
    var isBreak = keyword === "break";
    this.next();
    if (this.eat(types.semi) || this.insertSemicolon()) { node.label = null; }
    else if (this.type !== types.name) { this.unexpected(); }
    else {
      node.label = this.parseIdent();
      this.semicolon();
    }

    // Verify that there is an actual destination to break or
    // continue to.
    var i = 0;
    for (; i < this.labels.length; ++i) {
      var lab = this.labels[i];
      if (node.label == null || lab.name === node.label.name) {
        if (lab.kind != null && (isBreak || lab.kind === "loop")) { break }
        if (node.label && isBreak) { break }
      }
    }
    if (i === this.labels.length) { this.raise(node.start, "Unsyntactic " + keyword); }
    return this.finishNode(node, isBreak ? "BreakStatement" : "ContinueStatement")
  };

  pp$1.parseDebuggerStatement = function(node) {
    this.next();
    this.semicolon();
    return this.finishNode(node, "DebuggerStatement")
  };

  pp$1.parseDoStatement = function(node) {
    this.next();
    this.labels.push(loopLabel);
    node.body = this.parseStatement("do");
    this.labels.pop();
    this.expect(types._while);
    node.test = this.parseParenExpression();
    if (this.options.ecmaVersion >= 6)
      { this.eat(types.semi); }
    else
      { this.semicolon(); }
    return this.finishNode(node, "DoWhileStatement")
  };

  // Disambiguating between a `for` and a `for`/`in` or `for`/`of`
  // loop is non-trivial. Basically, we have to parse the init `var`
  // statement or expression, disallowing the `in` operator (see
  // the second parameter to `parseExpression`), and then check
  // whether the next token is `in` or `of`. When there is no init
  // part (semicolon immediately after the opening parenthesis), it
  // is a regular `for` loop.

  pp$1.parseForStatement = function(node) {
    this.next();
    var awaitAt = (this.options.ecmaVersion >= 9 && (this.inAsync || (!this.inFunction && this.options.allowAwaitOutsideFunction)) && this.eatContextual("await")) ? this.lastTokStart : -1;
    this.labels.push(loopLabel);
    this.enterScope(0);
    this.expect(types.parenL);
    if (this.type === types.semi) {
      if (awaitAt > -1) { this.unexpected(awaitAt); }
      return this.parseFor(node, null)
    }
    var isLet = this.isLet();
    if (this.type === types._var || this.type === types._const || isLet) {
      var init$1 = this.startNode(), kind = isLet ? "let" : this.value;
      this.next();
      this.parseVar(init$1, true, kind);
      this.finishNode(init$1, "VariableDeclaration");
      if ((this.type === types._in || (this.options.ecmaVersion >= 6 && this.isContextual("of"))) && init$1.declarations.length === 1) {
        if (this.options.ecmaVersion >= 9) {
          if (this.type === types._in) {
            if (awaitAt > -1) { this.unexpected(awaitAt); }
          } else { node.await = awaitAt > -1; }
        }
        return this.parseForIn(node, init$1)
      }
      if (awaitAt > -1) { this.unexpected(awaitAt); }
      return this.parseFor(node, init$1)
    }
    var refDestructuringErrors = new DestructuringErrors;
    var init = this.parseExpression(true, refDestructuringErrors);
    if (this.type === types._in || (this.options.ecmaVersion >= 6 && this.isContextual("of"))) {
      if (this.options.ecmaVersion >= 9) {
        if (this.type === types._in) {
          if (awaitAt > -1) { this.unexpected(awaitAt); }
        } else { node.await = awaitAt > -1; }
      }
      this.toAssignable(init, false, refDestructuringErrors);
      this.checkLVal(init);
      return this.parseForIn(node, init)
    } else {
      this.checkExpressionErrors(refDestructuringErrors, true);
    }
    if (awaitAt > -1) { this.unexpected(awaitAt); }
    return this.parseFor(node, init)
  };

  pp$1.parseFunctionStatement = function(node, isAsync, declarationPosition) {
    this.next();
    return this.parseFunction(node, FUNC_STATEMENT | (declarationPosition ? 0 : FUNC_HANGING_STATEMENT), false, isAsync)
  };

  pp$1.parseIfStatement = function(node) {
    this.next();
    node.test = this.parseParenExpression();
    // allow function declarations in branches, but only in non-strict mode
    node.consequent = this.parseStatement("if");
    node.alternate = this.eat(types._else) ? this.parseStatement("if") : null;
    return this.finishNode(node, "IfStatement")
  };

  pp$1.parseReturnStatement = function(node) {
    if (!this.inFunction && !this.options.allowReturnOutsideFunction)
      { this.raise(this.start, "'return' outside of function"); }
    this.next();

    // In `return` (and `break`/`continue`), the keywords with
    // optional arguments, we eagerly look for a semicolon or the
    // possibility to insert one.

    if (this.eat(types.semi) || this.insertSemicolon()) { node.argument = null; }
    else { node.argument = this.parseExpression(); this.semicolon(); }
    return this.finishNode(node, "ReturnStatement")
  };

  pp$1.parseSwitchStatement = function(node) {
    this.next();
    node.discriminant = this.parseParenExpression();
    node.cases = [];
    this.expect(types.braceL);
    this.labels.push(switchLabel);
    this.enterScope(0);

    // Statements under must be grouped (by label) in SwitchCase
    // nodes. `cur` is used to keep the node that we are currently
    // adding statements to.

    var cur;
    for (var sawDefault = false; this.type !== types.braceR;) {
      if (this.type === types._case || this.type === types._default) {
        var isCase = this.type === types._case;
        if (cur) { this.finishNode(cur, "SwitchCase"); }
        node.cases.push(cur = this.startNode());
        cur.consequent = [];
        this.next();
        if (isCase) {
          cur.test = this.parseExpression();
        } else {
          if (sawDefault) { this.raiseRecoverable(this.lastTokStart, "Multiple default clauses"); }
          sawDefault = true;
          cur.test = null;
        }
        this.expect(types.colon);
      } else {
        if (!cur) { this.unexpected(); }
        cur.consequent.push(this.parseStatement(null));
      }
    }
    this.exitScope();
    if (cur) { this.finishNode(cur, "SwitchCase"); }
    this.next(); // Closing brace
    this.labels.pop();
    return this.finishNode(node, "SwitchStatement")
  };

  pp$1.parseThrowStatement = function(node) {
    this.next();
    if (lineBreak.test(this.input.slice(this.lastTokEnd, this.start)))
      { this.raise(this.lastTokEnd, "Illegal newline after throw"); }
    node.argument = this.parseExpression();
    this.semicolon();
    return this.finishNode(node, "ThrowStatement")
  };

  // Reused empty array added for node fields that are always empty.

  var empty = [];

  pp$1.parseTryStatement = function(node) {
    this.next();
    node.block = this.parseBlock();
    node.handler = null;
    if (this.type === types._catch) {
      var clause = this.startNode();
      this.next();
      if (this.eat(types.parenL)) {
        clause.param = this.parseBindingAtom();
        var simple = clause.param.type === "Identifier";
        this.enterScope(simple ? SCOPE_SIMPLE_CATCH : 0);
        this.checkLVal(clause.param, simple ? BIND_SIMPLE_CATCH : BIND_LEXICAL);
        this.expect(types.parenR);
      } else {
        if (this.options.ecmaVersion < 10) { this.unexpected(); }
        clause.param = null;
        this.enterScope(0);
      }
      clause.body = this.parseBlock(false);
      this.exitScope();
      node.handler = this.finishNode(clause, "CatchClause");
    }
    node.finalizer = this.eat(types._finally) ? this.parseBlock() : null;
    if (!node.handler && !node.finalizer)
      { this.raise(node.start, "Missing catch or finally clause"); }
    return this.finishNode(node, "TryStatement")
  };

  pp$1.parseVarStatement = function(node, kind) {
    this.next();
    this.parseVar(node, false, kind);
    this.semicolon();
    return this.finishNode(node, "VariableDeclaration")
  };

  pp$1.parseWhileStatement = function(node) {
    this.next();
    node.test = this.parseParenExpression();
    this.labels.push(loopLabel);
    node.body = this.parseStatement("while");
    this.labels.pop();
    return this.finishNode(node, "WhileStatement")
  };

  pp$1.parseWithStatement = function(node) {
    if (this.strict) { this.raise(this.start, "'with' in strict mode"); }
    this.next();
    node.object = this.parseParenExpression();
    node.body = this.parseStatement("with");
    return this.finishNode(node, "WithStatement")
  };

  pp$1.parseEmptyStatement = function(node) {
    this.next();
    return this.finishNode(node, "EmptyStatement")
  };

  pp$1.parseLabeledStatement = function(node, maybeName, expr, context) {
    for (var i$1 = 0, list = this.labels; i$1 < list.length; i$1 += 1)
      {
      var label = list[i$1];

      if (label.name === maybeName)
        { this.raise(expr.start, "Label '" + maybeName + "' is already declared");
    } }
    var kind = this.type.isLoop ? "loop" : this.type === types._switch ? "switch" : null;
    for (var i = this.labels.length - 1; i >= 0; i--) {
      var label$1 = this.labels[i];
      if (label$1.statementStart === node.start) {
        // Update information about previous labels on this node
        label$1.statementStart = this.start;
        label$1.kind = kind;
      } else { break }
    }
    this.labels.push({name: maybeName, kind: kind, statementStart: this.start});
    node.body = this.parseStatement(context ? context.indexOf("label") === -1 ? context + "label" : context : "label");
    this.labels.pop();
    node.label = expr;
    return this.finishNode(node, "LabeledStatement")
  };

  pp$1.parseExpressionStatement = function(node, expr) {
    node.expression = expr;
    this.semicolon();
    return this.finishNode(node, "ExpressionStatement")
  };

  // Parse a semicolon-enclosed block of statements, handling `"use
  // strict"` declarations when `allowStrict` is true (used for
  // function bodies).

  pp$1.parseBlock = function(createNewLexicalScope, node) {
    if ( createNewLexicalScope === void 0 ) createNewLexicalScope = true;
    if ( node === void 0 ) node = this.startNode();

    node.body = [];
    this.expect(types.braceL);
    if (createNewLexicalScope) { this.enterScope(0); }
    while (!this.eat(types.braceR)) {
      var stmt = this.parseStatement(null);
      node.body.push(stmt);
    }
    if (createNewLexicalScope) { this.exitScope(); }
    return this.finishNode(node, "BlockStatement")
  };

  // Parse a regular `for` loop. The disambiguation code in
  // `parseStatement` will already have parsed the init statement or
  // expression.

  pp$1.parseFor = function(node, init) {
    node.init = init;
    this.expect(types.semi);
    node.test = this.type === types.semi ? null : this.parseExpression();
    this.expect(types.semi);
    node.update = this.type === types.parenR ? null : this.parseExpression();
    this.expect(types.parenR);
    node.body = this.parseStatement("for");
    this.exitScope();
    this.labels.pop();
    return this.finishNode(node, "ForStatement")
  };

  // Parse a `for`/`in` and `for`/`of` loop, which are almost
  // same from parser's perspective.

  pp$1.parseForIn = function(node, init) {
    var isForIn = this.type === types._in;
    this.next();

    if (
      init.type === "VariableDeclaration" &&
      init.declarations[0].init != null &&
      (
        !isForIn ||
        this.options.ecmaVersion < 8 ||
        this.strict ||
        init.kind !== "var" ||
        init.declarations[0].id.type !== "Identifier"
      )
    ) {
      this.raise(
        init.start,
        ((isForIn ? "for-in" : "for-of") + " loop variable declaration may not have an initializer")
      );
    } else if (init.type === "AssignmentPattern") {
      this.raise(init.start, "Invalid left-hand side in for-loop");
    }
    node.left = init;
    node.right = isForIn ? this.parseExpression() : this.parseMaybeAssign();
    this.expect(types.parenR);
    node.body = this.parseStatement("for");
    this.exitScope();
    this.labels.pop();
    return this.finishNode(node, isForIn ? "ForInStatement" : "ForOfStatement")
  };

  // Parse a list of variable declarations.

  pp$1.parseVar = function(node, isFor, kind) {
    node.declarations = [];
    node.kind = kind;
    for (;;) {
      var decl = this.startNode();
      this.parseVarId(decl, kind);
      if (this.eat(types.eq)) {
        decl.init = this.parseMaybeAssign(isFor);
      } else if (kind === "const" && !(this.type === types._in || (this.options.ecmaVersion >= 6 && this.isContextual("of")))) {
        this.unexpected();
      } else if (decl.id.type !== "Identifier" && !(isFor && (this.type === types._in || this.isContextual("of")))) {
        this.raise(this.lastTokEnd, "Complex binding patterns require an initialization value");
      } else {
        decl.init = null;
      }
      node.declarations.push(this.finishNode(decl, "VariableDeclarator"));
      if (!this.eat(types.comma)) { break }
    }
    return node
  };

  pp$1.parseVarId = function(decl, kind) {
    decl.id = this.parseBindingAtom();
    this.checkLVal(decl.id, kind === "var" ? BIND_VAR : BIND_LEXICAL, false);
  };

  var FUNC_STATEMENT = 1, FUNC_HANGING_STATEMENT = 2, FUNC_NULLABLE_ID = 4;

  // Parse a function declaration or literal (depending on the
  // `statement & FUNC_STATEMENT`).

  // Remove `allowExpressionBody` for 7.0.0, as it is only called with false
  pp$1.parseFunction = function(node, statement, allowExpressionBody, isAsync) {
    this.initFunction(node);
    if (this.options.ecmaVersion >= 9 || this.options.ecmaVersion >= 6 && !isAsync) {
      if (this.type === types.star && (statement & FUNC_HANGING_STATEMENT))
        { this.unexpected(); }
      node.generator = this.eat(types.star);
    }
    if (this.options.ecmaVersion >= 8)
      { node.async = !!isAsync; }

    if (statement & FUNC_STATEMENT) {
      node.id = (statement & FUNC_NULLABLE_ID) && this.type !== types.name ? null : this.parseIdent();
      if (node.id && !(statement & FUNC_HANGING_STATEMENT))
        // If it is a regular function declaration in sloppy mode, then it is
        // subject to Annex B semantics (BIND_FUNCTION). Otherwise, the binding
        // mode depends on properties of the current scope (see
        // treatFunctionsAsVar).
        { this.checkLVal(node.id, (this.strict || node.generator || node.async) ? this.treatFunctionsAsVar ? BIND_VAR : BIND_LEXICAL : BIND_FUNCTION); }
    }

    var oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;
    this.yieldPos = 0;
    this.awaitPos = 0;
    this.awaitIdentPos = 0;
    this.enterScope(functionFlags(node.async, node.generator));

    if (!(statement & FUNC_STATEMENT))
      { node.id = this.type === types.name ? this.parseIdent() : null; }

    this.parseFunctionParams(node);
    this.parseFunctionBody(node, allowExpressionBody, false);

    this.yieldPos = oldYieldPos;
    this.awaitPos = oldAwaitPos;
    this.awaitIdentPos = oldAwaitIdentPos;
    return this.finishNode(node, (statement & FUNC_STATEMENT) ? "FunctionDeclaration" : "FunctionExpression")
  };

  pp$1.parseFunctionParams = function(node) {
    this.expect(types.parenL);
    node.params = this.parseBindingList(types.parenR, false, this.options.ecmaVersion >= 8);
    this.checkYieldAwaitInDefaultParams();
  };

  // Parse a class declaration or literal (depending on the
  // `isStatement` parameter).

  pp$1.parseClass = function(node, isStatement) {
    this.next();

    // ecma-262 14.6 Class Definitions
    // A class definition is always strict mode code.
    var oldStrict = this.strict;
    this.strict = true;

    this.parseClassId(node, isStatement);
    this.parseClassSuper(node);
    var classBody = this.startNode();
    var hadConstructor = false;
    classBody.body = [];
    this.expect(types.braceL);
    while (!this.eat(types.braceR)) {
      var element = this.parseClassElement(node.superClass !== null);
      if (element) {
        classBody.body.push(element);
        if (element.type === "MethodDefinition" && element.kind === "constructor") {
          if (hadConstructor) { this.raise(element.start, "Duplicate constructor in the same class"); }
          hadConstructor = true;
        }
      }
    }
    node.body = this.finishNode(classBody, "ClassBody");
    this.strict = oldStrict;
    return this.finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression")
  };

  pp$1.parseClassElement = function(constructorAllowsSuper) {
    var this$1 = this;

    if (this.eat(types.semi)) { return null }

    var method = this.startNode();
    var tryContextual = function (k, noLineBreak) {
      if ( noLineBreak === void 0 ) noLineBreak = false;

      var start = this$1.start, startLoc = this$1.startLoc;
      if (!this$1.eatContextual(k)) { return false }
      if (this$1.type !== types.parenL && (!noLineBreak || !this$1.canInsertSemicolon())) { return true }
      if (method.key) { this$1.unexpected(); }
      method.computed = false;
      method.key = this$1.startNodeAt(start, startLoc);
      method.key.name = k;
      this$1.finishNode(method.key, "Identifier");
      return false
    };

    method.kind = "method";
    method.static = tryContextual("static");
    var isGenerator = this.eat(types.star);
    var isAsync = false;
    if (!isGenerator) {
      if (this.options.ecmaVersion >= 8 && tryContextual("async", true)) {
        isAsync = true;
        isGenerator = this.options.ecmaVersion >= 9 && this.eat(types.star);
      } else if (tryContextual("get")) {
        method.kind = "get";
      } else if (tryContextual("set")) {
        method.kind = "set";
      }
    }
    if (!method.key) { this.parsePropertyName(method); }
    var key = method.key;
    var allowsDirectSuper = false;
    if (!method.computed && !method.static && (key.type === "Identifier" && key.name === "constructor" ||
        key.type === "Literal" && key.value === "constructor")) {
      if (method.kind !== "method") { this.raise(key.start, "Constructor can't have get/set modifier"); }
      if (isGenerator) { this.raise(key.start, "Constructor can't be a generator"); }
      if (isAsync) { this.raise(key.start, "Constructor can't be an async method"); }
      method.kind = "constructor";
      allowsDirectSuper = constructorAllowsSuper;
    } else if (method.static && key.type === "Identifier" && key.name === "prototype") {
      this.raise(key.start, "Classes may not have a static property named prototype");
    }
    this.parseClassMethod(method, isGenerator, isAsync, allowsDirectSuper);
    if (method.kind === "get" && method.value.params.length !== 0)
      { this.raiseRecoverable(method.value.start, "getter should have no params"); }
    if (method.kind === "set" && method.value.params.length !== 1)
      { this.raiseRecoverable(method.value.start, "setter should have exactly one param"); }
    if (method.kind === "set" && method.value.params[0].type === "RestElement")
      { this.raiseRecoverable(method.value.params[0].start, "Setter cannot use rest params"); }
    return method
  };

  pp$1.parseClassMethod = function(method, isGenerator, isAsync, allowsDirectSuper) {
    method.value = this.parseMethod(isGenerator, isAsync, allowsDirectSuper);
    return this.finishNode(method, "MethodDefinition")
  };

  pp$1.parseClassId = function(node, isStatement) {
    if (this.type === types.name) {
      node.id = this.parseIdent();
      if (isStatement)
        { this.checkLVal(node.id, BIND_LEXICAL, false); }
    } else {
      if (isStatement === true)
        { this.unexpected(); }
      node.id = null;
    }
  };

  pp$1.parseClassSuper = function(node) {
    node.superClass = this.eat(types._extends) ? this.parseExprSubscripts() : null;
  };

  // Parses module export declaration.

  pp$1.parseExport = function(node, exports) {
    this.next();
    // export * from '...'
    if (this.eat(types.star)) {
      this.expectContextual("from");
      if (this.type !== types.string) { this.unexpected(); }
      node.source = this.parseExprAtom();
      this.semicolon();
      return this.finishNode(node, "ExportAllDeclaration")
    }
    if (this.eat(types._default)) { // export default ...
      this.checkExport(exports, "default", this.lastTokStart);
      var isAsync;
      if (this.type === types._function || (isAsync = this.isAsyncFunction())) {
        var fNode = this.startNode();
        this.next();
        if (isAsync) { this.next(); }
        node.declaration = this.parseFunction(fNode, FUNC_STATEMENT | FUNC_NULLABLE_ID, false, isAsync);
      } else if (this.type === types._class) {
        var cNode = this.startNode();
        node.declaration = this.parseClass(cNode, "nullableID");
      } else {
        node.declaration = this.parseMaybeAssign();
        this.semicolon();
      }
      return this.finishNode(node, "ExportDefaultDeclaration")
    }
    // export var|const|let|function|class ...
    if (this.shouldParseExportStatement()) {
      node.declaration = this.parseStatement(null);
      if (node.declaration.type === "VariableDeclaration")
        { this.checkVariableExport(exports, node.declaration.declarations); }
      else
        { this.checkExport(exports, node.declaration.id.name, node.declaration.id.start); }
      node.specifiers = [];
      node.source = null;
    } else { // export { x, y as z } [from '...']
      node.declaration = null;
      node.specifiers = this.parseExportSpecifiers(exports);
      if (this.eatContextual("from")) {
        if (this.type !== types.string) { this.unexpected(); }
        node.source = this.parseExprAtom();
      } else {
        for (var i = 0, list = node.specifiers; i < list.length; i += 1) {
          // check for keywords used as local names
          var spec = list[i];

          this.checkUnreserved(spec.local);
          // check if export is defined
          this.checkLocalExport(spec.local);
        }

        node.source = null;
      }
      this.semicolon();
    }
    return this.finishNode(node, "ExportNamedDeclaration")
  };

  pp$1.checkExport = function(exports, name, pos) {
    if (!exports) { return }
    if (has(exports, name))
      { this.raiseRecoverable(pos, "Duplicate export '" + name + "'"); }
    exports[name] = true;
  };

  pp$1.checkPatternExport = function(exports, pat) {
    var type = pat.type;
    if (type === "Identifier")
      { this.checkExport(exports, pat.name, pat.start); }
    else if (type === "ObjectPattern")
      { for (var i = 0, list = pat.properties; i < list.length; i += 1)
        {
          var prop = list[i];

          this.checkPatternExport(exports, prop);
        } }
    else if (type === "ArrayPattern")
      { for (var i$1 = 0, list$1 = pat.elements; i$1 < list$1.length; i$1 += 1) {
        var elt = list$1[i$1];

          if (elt) { this.checkPatternExport(exports, elt); }
      } }
    else if (type === "Property")
      { this.checkPatternExport(exports, pat.value); }
    else if (type === "AssignmentPattern")
      { this.checkPatternExport(exports, pat.left); }
    else if (type === "RestElement")
      { this.checkPatternExport(exports, pat.argument); }
    else if (type === "ParenthesizedExpression")
      { this.checkPatternExport(exports, pat.expression); }
  };

  pp$1.checkVariableExport = function(exports, decls) {
    if (!exports) { return }
    for (var i = 0, list = decls; i < list.length; i += 1)
      {
      var decl = list[i];

      this.checkPatternExport(exports, decl.id);
    }
  };

  pp$1.shouldParseExportStatement = function() {
    return this.type.keyword === "var" ||
      this.type.keyword === "const" ||
      this.type.keyword === "class" ||
      this.type.keyword === "function" ||
      this.isLet() ||
      this.isAsyncFunction()
  };

  // Parses a comma-separated list of module exports.

  pp$1.parseExportSpecifiers = function(exports) {
    var nodes = [], first = true;
    // export { x, y as z } [from '...']
    this.expect(types.braceL);
    while (!this.eat(types.braceR)) {
      if (!first) {
        this.expect(types.comma);
        if (this.afterTrailingComma(types.braceR)) { break }
      } else { first = false; }

      var node = this.startNode();
      node.local = this.parseIdent(true);
      node.exported = this.eatContextual("as") ? this.parseIdent(true) : node.local;
      this.checkExport(exports, node.exported.name, node.exported.start);
      nodes.push(this.finishNode(node, "ExportSpecifier"));
    }
    return nodes
  };

  // Parses import declaration.

  pp$1.parseImport = function(node) {
    this.next();
    // import '...'
    if (this.type === types.string) {
      node.specifiers = empty;
      node.source = this.parseExprAtom();
    } else {
      node.specifiers = this.parseImportSpecifiers();
      this.expectContextual("from");
      node.source = this.type === types.string ? this.parseExprAtom() : this.unexpected();
    }
    this.semicolon();
    return this.finishNode(node, "ImportDeclaration")
  };

  // Parses a comma-separated list of module imports.

  pp$1.parseImportSpecifiers = function() {
    var nodes = [], first = true;
    if (this.type === types.name) {
      // import defaultObj, { x, y as z } from '...'
      var node = this.startNode();
      node.local = this.parseIdent();
      this.checkLVal(node.local, BIND_LEXICAL);
      nodes.push(this.finishNode(node, "ImportDefaultSpecifier"));
      if (!this.eat(types.comma)) { return nodes }
    }
    if (this.type === types.star) {
      var node$1 = this.startNode();
      this.next();
      this.expectContextual("as");
      node$1.local = this.parseIdent();
      this.checkLVal(node$1.local, BIND_LEXICAL);
      nodes.push(this.finishNode(node$1, "ImportNamespaceSpecifier"));
      return nodes
    }
    this.expect(types.braceL);
    while (!this.eat(types.braceR)) {
      if (!first) {
        this.expect(types.comma);
        if (this.afterTrailingComma(types.braceR)) { break }
      } else { first = false; }

      var node$2 = this.startNode();
      node$2.imported = this.parseIdent(true);
      if (this.eatContextual("as")) {
        node$2.local = this.parseIdent();
      } else {
        this.checkUnreserved(node$2.imported);
        node$2.local = node$2.imported;
      }
      this.checkLVal(node$2.local, BIND_LEXICAL);
      nodes.push(this.finishNode(node$2, "ImportSpecifier"));
    }
    return nodes
  };

  // Set `ExpressionStatement#directive` property for directive prologues.
  pp$1.adaptDirectivePrologue = function(statements) {
    for (var i = 0; i < statements.length && this.isDirectiveCandidate(statements[i]); ++i) {
      statements[i].directive = statements[i].expression.raw.slice(1, -1);
    }
  };
  pp$1.isDirectiveCandidate = function(statement) {
    return (
      statement.type === "ExpressionStatement" &&
      statement.expression.type === "Literal" &&
      typeof statement.expression.value === "string" &&
      // Reject parenthesized strings.
      (this.input[statement.start] === "\"" || this.input[statement.start] === "'")
    )
  };

  var pp$2 = Parser.prototype;

  // Convert existing expression atom to assignable pattern
  // if possible.

  pp$2.toAssignable = function(node, isBinding, refDestructuringErrors) {
    if (this.options.ecmaVersion >= 6 && node) {
      switch (node.type) {
      case "Identifier":
        if (this.inAsync && node.name === "await")
          { this.raise(node.start, "Cannot use 'await' as identifier inside an async function"); }
        break

      case "ObjectPattern":
      case "ArrayPattern":
      case "RestElement":
        break

      case "ObjectExpression":
        node.type = "ObjectPattern";
        if (refDestructuringErrors) { this.checkPatternErrors(refDestructuringErrors, true); }
        for (var i = 0, list = node.properties; i < list.length; i += 1) {
          var prop = list[i];

        this.toAssignable(prop, isBinding);
          // Early error:
          //   AssignmentRestProperty[Yield, Await] :
          //     `...` DestructuringAssignmentTarget[Yield, Await]
          //
          //   It is a Syntax Error if |DestructuringAssignmentTarget| is an |ArrayLiteral| or an |ObjectLiteral|.
          if (
            prop.type === "RestElement" &&
            (prop.argument.type === "ArrayPattern" || prop.argument.type === "ObjectPattern")
          ) {
            this.raise(prop.argument.start, "Unexpected token");
          }
        }
        break

      case "Property":
        // AssignmentProperty has type === "Property"
        if (node.kind !== "init") { this.raise(node.key.start, "Object pattern can't contain getter or setter"); }
        this.toAssignable(node.value, isBinding);
        break

      case "ArrayExpression":
        node.type = "ArrayPattern";
        if (refDestructuringErrors) { this.checkPatternErrors(refDestructuringErrors, true); }
        this.toAssignableList(node.elements, isBinding);
        break

      case "SpreadElement":
        node.type = "RestElement";
        this.toAssignable(node.argument, isBinding);
        if (node.argument.type === "AssignmentPattern")
          { this.raise(node.argument.start, "Rest elements cannot have a default value"); }
        break

      case "AssignmentExpression":
        if (node.operator !== "=") { this.raise(node.left.end, "Only '=' operator can be used for specifying default value."); }
        node.type = "AssignmentPattern";
        delete node.operator;
        this.toAssignable(node.left, isBinding);
        // falls through to AssignmentPattern

      case "AssignmentPattern":
        break

      case "ParenthesizedExpression":
        this.toAssignable(node.expression, isBinding, refDestructuringErrors);
        break

      case "MemberExpression":
        if (!isBinding) { break }

      default:
        this.raise(node.start, "Assigning to rvalue");
      }
    } else if (refDestructuringErrors) { this.checkPatternErrors(refDestructuringErrors, true); }
    return node
  };

  // Convert list of expression atoms to binding list.

  pp$2.toAssignableList = function(exprList, isBinding) {
    var end = exprList.length;
    for (var i = 0; i < end; i++) {
      var elt = exprList[i];
      if (elt) { this.toAssignable(elt, isBinding); }
    }
    if (end) {
      var last = exprList[end - 1];
      if (this.options.ecmaVersion === 6 && isBinding && last && last.type === "RestElement" && last.argument.type !== "Identifier")
        { this.unexpected(last.argument.start); }
    }
    return exprList
  };

  // Parses spread element.

  pp$2.parseSpread = function(refDestructuringErrors) {
    var node = this.startNode();
    this.next();
    node.argument = this.parseMaybeAssign(false, refDestructuringErrors);
    return this.finishNode(node, "SpreadElement")
  };

  pp$2.parseRestBinding = function() {
    var node = this.startNode();
    this.next();

    // RestElement inside of a function parameter must be an identifier
    if (this.options.ecmaVersion === 6 && this.type !== types.name)
      { this.unexpected(); }

    node.argument = this.parseBindingAtom();

    return this.finishNode(node, "RestElement")
  };

  // Parses lvalue (assignable) atom.

  pp$2.parseBindingAtom = function() {
    if (this.options.ecmaVersion >= 6) {
      switch (this.type) {
      case types.bracketL:
        var node = this.startNode();
        this.next();
        node.elements = this.parseBindingList(types.bracketR, true, true);
        return this.finishNode(node, "ArrayPattern")

      case types.braceL:
        return this.parseObj(true)
      }
    }
    return this.parseIdent()
  };

  pp$2.parseBindingList = function(close, allowEmpty, allowTrailingComma) {
    var elts = [], first = true;
    while (!this.eat(close)) {
      if (first) { first = false; }
      else { this.expect(types.comma); }
      if (allowEmpty && this.type === types.comma) {
        elts.push(null);
      } else if (allowTrailingComma && this.afterTrailingComma(close)) {
        break
      } else if (this.type === types.ellipsis) {
        var rest = this.parseRestBinding();
        this.parseBindingListItem(rest);
        elts.push(rest);
        if (this.type === types.comma) { this.raise(this.start, "Comma is not permitted after the rest element"); }
        this.expect(close);
        break
      } else {
        var elem = this.parseMaybeDefault(this.start, this.startLoc);
        this.parseBindingListItem(elem);
        elts.push(elem);
      }
    }
    return elts
  };

  pp$2.parseBindingListItem = function(param) {
    return param
  };

  // Parses assignment pattern around given atom if possible.

  pp$2.parseMaybeDefault = function(startPos, startLoc, left) {
    left = left || this.parseBindingAtom();
    if (this.options.ecmaVersion < 6 || !this.eat(types.eq)) { return left }
    var node = this.startNodeAt(startPos, startLoc);
    node.left = left;
    node.right = this.parseMaybeAssign();
    return this.finishNode(node, "AssignmentPattern")
  };

  // Verify that a node is an lval — something that can be assigned
  // to.
  // bindingType can be either:
  // 'var' indicating that the lval creates a 'var' binding
  // 'let' indicating that the lval creates a lexical ('let' or 'const') binding
  // 'none' indicating that the binding should be checked for illegal identifiers, but not for duplicate references

  pp$2.checkLVal = function(expr, bindingType, checkClashes) {
    if ( bindingType === void 0 ) bindingType = BIND_NONE;

    switch (expr.type) {
    case "Identifier":
      if (bindingType === BIND_LEXICAL && expr.name === "let")
        { this.raiseRecoverable(expr.start, "let is disallowed as a lexically bound name"); }
      if (this.strict && this.reservedWordsStrictBind.test(expr.name))
        { this.raiseRecoverable(expr.start, (bindingType ? "Binding " : "Assigning to ") + expr.name + " in strict mode"); }
      if (checkClashes) {
        if (has(checkClashes, expr.name))
          { this.raiseRecoverable(expr.start, "Argument name clash"); }
        checkClashes[expr.name] = true;
      }
      if (bindingType !== BIND_NONE && bindingType !== BIND_OUTSIDE) { this.declareName(expr.name, bindingType, expr.start); }
      break

    case "MemberExpression":
      if (bindingType) { this.raiseRecoverable(expr.start, "Binding member expression"); }
      break

    case "ObjectPattern":
      for (var i = 0, list = expr.properties; i < list.length; i += 1)
        {
      var prop = list[i];

      this.checkLVal(prop, bindingType, checkClashes);
    }
      break

    case "Property":
      // AssignmentProperty has type === "Property"
      this.checkLVal(expr.value, bindingType, checkClashes);
      break

    case "ArrayPattern":
      for (var i$1 = 0, list$1 = expr.elements; i$1 < list$1.length; i$1 += 1) {
        var elem = list$1[i$1];

      if (elem) { this.checkLVal(elem, bindingType, checkClashes); }
      }
      break

    case "AssignmentPattern":
      this.checkLVal(expr.left, bindingType, checkClashes);
      break

    case "RestElement":
      this.checkLVal(expr.argument, bindingType, checkClashes);
      break

    case "ParenthesizedExpression":
      this.checkLVal(expr.expression, bindingType, checkClashes);
      break

    default:
      this.raise(expr.start, (bindingType ? "Binding" : "Assigning to") + " rvalue");
    }
  };

  // A recursive descent parser operates by defining functions for all

  var pp$3 = Parser.prototype;

  // Check if property name clashes with already added.
  // Object/class getters and setters are not allowed to clash —
  // either with each other or with an init property — and in
  // strict mode, init properties are also not allowed to be repeated.

  pp$3.checkPropClash = function(prop, propHash, refDestructuringErrors) {
    if (this.options.ecmaVersion >= 9 && prop.type === "SpreadElement")
      { return }
    if (this.options.ecmaVersion >= 6 && (prop.computed || prop.method || prop.shorthand))
      { return }
    var key = prop.key;
    var name;
    switch (key.type) {
    case "Identifier": name = key.name; break
    case "Literal": name = String(key.value); break
    default: return
    }
    var kind = prop.kind;
    if (this.options.ecmaVersion >= 6) {
      if (name === "__proto__" && kind === "init") {
        if (propHash.proto) {
          if (refDestructuringErrors && refDestructuringErrors.doubleProto < 0) { refDestructuringErrors.doubleProto = key.start; }
          // Backwards-compat kludge. Can be removed in version 6.0
          else { this.raiseRecoverable(key.start, "Redefinition of __proto__ property"); }
        }
        propHash.proto = true;
      }
      return
    }
    name = "$" + name;
    var other = propHash[name];
    if (other) {
      var redefinition;
      if (kind === "init") {
        redefinition = this.strict && other.init || other.get || other.set;
      } else {
        redefinition = other.init || other[kind];
      }
      if (redefinition)
        { this.raiseRecoverable(key.start, "Redefinition of property"); }
    } else {
      other = propHash[name] = {
        init: false,
        get: false,
        set: false
      };
    }
    other[kind] = true;
  };

  // ### Expression parsing

  // These nest, from the most general expression type at the top to
  // 'atomic', nondivisible expression types at the bottom. Most of
  // the functions will simply let the function(s) below them parse,
  // and, *if* the syntactic construct they handle is present, wrap
  // the AST node that the inner parser gave them in another node.

  // Parse a full expression. The optional arguments are used to
  // forbid the `in` operator (in for loops initalization expressions)
  // and provide reference for storing '=' operator inside shorthand
  // property assignment in contexts where both object expression
  // and object pattern might appear (so it's possible to raise
  // delayed syntax error at correct position).

  pp$3.parseExpression = function(noIn, refDestructuringErrors) {
    var startPos = this.start, startLoc = this.startLoc;
    var expr = this.parseMaybeAssign(noIn, refDestructuringErrors);
    if (this.type === types.comma) {
      var node = this.startNodeAt(startPos, startLoc);
      node.expressions = [expr];
      while (this.eat(types.comma)) { node.expressions.push(this.parseMaybeAssign(noIn, refDestructuringErrors)); }
      return this.finishNode(node, "SequenceExpression")
    }
    return expr
  };

  // Parse an assignment expression. This includes applications of
  // operators like `+=`.

  pp$3.parseMaybeAssign = function(noIn, refDestructuringErrors, afterLeftParse) {
    if (this.isContextual("yield")) {
      if (this.inGenerator) { return this.parseYield(noIn) }
      // The tokenizer will assume an expression is allowed after
      // `yield`, but this isn't that kind of yield
      else { this.exprAllowed = false; }
    }

    var ownDestructuringErrors = false, oldParenAssign = -1, oldTrailingComma = -1, oldShorthandAssign = -1;
    if (refDestructuringErrors) {
      oldParenAssign = refDestructuringErrors.parenthesizedAssign;
      oldTrailingComma = refDestructuringErrors.trailingComma;
      oldShorthandAssign = refDestructuringErrors.shorthandAssign;
      refDestructuringErrors.parenthesizedAssign = refDestructuringErrors.trailingComma = refDestructuringErrors.shorthandAssign = -1;
    } else {
      refDestructuringErrors = new DestructuringErrors;
      ownDestructuringErrors = true;
    }

    var startPos = this.start, startLoc = this.startLoc;
    if (this.type === types.parenL || this.type === types.name)
      { this.potentialArrowAt = this.start; }
    var left = this.parseMaybeConditional(noIn, refDestructuringErrors);
    if (afterLeftParse) { left = afterLeftParse.call(this, left, startPos, startLoc); }
    if (this.type.isAssign) {
      var node = this.startNodeAt(startPos, startLoc);
      node.operator = this.value;
      node.left = this.type === types.eq ? this.toAssignable(left, false, refDestructuringErrors) : left;
      if (!ownDestructuringErrors) { DestructuringErrors.call(refDestructuringErrors); }
      refDestructuringErrors.shorthandAssign = -1; // reset because shorthand default was used correctly
      this.checkLVal(left);
      this.next();
      node.right = this.parseMaybeAssign(noIn);
      return this.finishNode(node, "AssignmentExpression")
    } else {
      if (ownDestructuringErrors) { this.checkExpressionErrors(refDestructuringErrors, true); }
    }
    if (oldParenAssign > -1) { refDestructuringErrors.parenthesizedAssign = oldParenAssign; }
    if (oldTrailingComma > -1) { refDestructuringErrors.trailingComma = oldTrailingComma; }
    if (oldShorthandAssign > -1) { refDestructuringErrors.shorthandAssign = oldShorthandAssign; }
    return left
  };

  // Parse a ternary conditional (`?:`) operator.

  pp$3.parseMaybeConditional = function(noIn, refDestructuringErrors) {
    var startPos = this.start, startLoc = this.startLoc;
    var expr = this.parseExprOps(noIn, refDestructuringErrors);
    if (this.checkExpressionErrors(refDestructuringErrors)) { return expr }
    if (this.eat(types.question)) {
      var node = this.startNodeAt(startPos, startLoc);
      node.test = expr;
      node.consequent = this.parseMaybeAssign();
      this.expect(types.colon);
      node.alternate = this.parseMaybeAssign(noIn);
      return this.finishNode(node, "ConditionalExpression")
    }
    return expr
  };

  // Start the precedence parser.

  pp$3.parseExprOps = function(noIn, refDestructuringErrors) {
    var startPos = this.start, startLoc = this.startLoc;
    var expr = this.parseMaybeUnary(refDestructuringErrors, false);
    if (this.checkExpressionErrors(refDestructuringErrors)) { return expr }
    return expr.start === startPos && expr.type === "ArrowFunctionExpression" ? expr : this.parseExprOp(expr, startPos, startLoc, -1, noIn)
  };

  // Parse binary operators with the operator precedence parsing
  // algorithm. `left` is the left-hand side of the operator.
  // `minPrec` provides context that allows the function to stop and
  // defer further parser to one of its callers when it encounters an
  // operator that has a lower precedence than the set it is parsing.

  pp$3.parseExprOp = function(left, leftStartPos, leftStartLoc, minPrec, noIn) {
    var prec = this.type.binop;
    if (prec != null && (!noIn || this.type !== types._in)) {
      if (prec > minPrec) {
        var logical = this.type === types.logicalOR || this.type === types.logicalAND;
        var op = this.value;
        this.next();
        var startPos = this.start, startLoc = this.startLoc;
        var right = this.parseExprOp(this.parseMaybeUnary(null, false), startPos, startLoc, prec, noIn);
        var node = this.buildBinary(leftStartPos, leftStartLoc, left, right, op, logical);
        return this.parseExprOp(node, leftStartPos, leftStartLoc, minPrec, noIn)
      }
    }
    return left
  };

  pp$3.buildBinary = function(startPos, startLoc, left, right, op, logical) {
    var node = this.startNodeAt(startPos, startLoc);
    node.left = left;
    node.operator = op;
    node.right = right;
    return this.finishNode(node, logical ? "LogicalExpression" : "BinaryExpression")
  };

  // Parse unary operators, both prefix and postfix.

  pp$3.parseMaybeUnary = function(refDestructuringErrors, sawUnary) {
    var startPos = this.start, startLoc = this.startLoc, expr;
    if (this.isContextual("await") && (this.inAsync || (!this.inFunction && this.options.allowAwaitOutsideFunction))) {
      expr = this.parseAwait();
      sawUnary = true;
    } else if (this.type.prefix) {
      var node = this.startNode(), update = this.type === types.incDec;
      node.operator = this.value;
      node.prefix = true;
      this.next();
      node.argument = this.parseMaybeUnary(null, true);
      this.checkExpressionErrors(refDestructuringErrors, true);
      if (update) { this.checkLVal(node.argument); }
      else if (this.strict && node.operator === "delete" &&
               node.argument.type === "Identifier")
        { this.raiseRecoverable(node.start, "Deleting local variable in strict mode"); }
      else { sawUnary = true; }
      expr = this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression");
    } else {
      expr = this.parseExprSubscripts(refDestructuringErrors);
      if (this.checkExpressionErrors(refDestructuringErrors)) { return expr }
      while (this.type.postfix && !this.canInsertSemicolon()) {
        var node$1 = this.startNodeAt(startPos, startLoc);
        node$1.operator = this.value;
        node$1.prefix = false;
        node$1.argument = expr;
        this.checkLVal(expr);
        this.next();
        expr = this.finishNode(node$1, "UpdateExpression");
      }
    }

    if (!sawUnary && this.eat(types.starstar))
      { return this.buildBinary(startPos, startLoc, expr, this.parseMaybeUnary(null, false), "**", false) }
    else
      { return expr }
  };

  // Parse call, dot, and `[]`-subscript expressions.

  pp$3.parseExprSubscripts = function(refDestructuringErrors) {
    var startPos = this.start, startLoc = this.startLoc;
    var expr = this.parseExprAtom(refDestructuringErrors);
    var skipArrowSubscripts = expr.type === "ArrowFunctionExpression" && this.input.slice(this.lastTokStart, this.lastTokEnd) !== ")";
    if (this.checkExpressionErrors(refDestructuringErrors) || skipArrowSubscripts) { return expr }
    var result = this.parseSubscripts(expr, startPos, startLoc);
    if (refDestructuringErrors && result.type === "MemberExpression") {
      if (refDestructuringErrors.parenthesizedAssign >= result.start) { refDestructuringErrors.parenthesizedAssign = -1; }
      if (refDestructuringErrors.parenthesizedBind >= result.start) { refDestructuringErrors.parenthesizedBind = -1; }
    }
    return result
  };

  pp$3.parseSubscripts = function(base, startPos, startLoc, noCalls) {
    var maybeAsyncArrow = this.options.ecmaVersion >= 8 && base.type === "Identifier" && base.name === "async" &&
        this.lastTokEnd === base.end && !this.canInsertSemicolon() && this.input.slice(base.start, base.end) === "async";
    while (true) {
      var element = this.parseSubscript(base, startPos, startLoc, noCalls, maybeAsyncArrow);
      if (element === base || element.type === "ArrowFunctionExpression") { return element }
      base = element;
    }
  };

  pp$3.parseSubscript = function(base, startPos, startLoc, noCalls, maybeAsyncArrow) {
    var computed = this.eat(types.bracketL);
    if (computed || this.eat(types.dot)) {
      var node = this.startNodeAt(startPos, startLoc);
      node.object = base;
      node.property = computed ? this.parseExpression() : this.parseIdent(this.options.allowReserved !== "never");
      node.computed = !!computed;
      if (computed) { this.expect(types.bracketR); }
      base = this.finishNode(node, "MemberExpression");
    } else if (!noCalls && this.eat(types.parenL)) {
      var refDestructuringErrors = new DestructuringErrors, oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;
      this.yieldPos = 0;
      this.awaitPos = 0;
      this.awaitIdentPos = 0;
      var exprList = this.parseExprList(types.parenR, this.options.ecmaVersion >= 8 && base.type !== "Import", false, refDestructuringErrors);
      if (maybeAsyncArrow && !this.canInsertSemicolon() && this.eat(types.arrow)) {
        this.checkPatternErrors(refDestructuringErrors, false);
        this.checkYieldAwaitInDefaultParams();
        if (this.awaitIdentPos > 0)
          { this.raise(this.awaitIdentPos, "Cannot use 'await' as identifier inside an async function"); }
        this.yieldPos = oldYieldPos;
        this.awaitPos = oldAwaitPos;
        this.awaitIdentPos = oldAwaitIdentPos;
        return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), exprList, true)
      }
      this.checkExpressionErrors(refDestructuringErrors, true);
      this.yieldPos = oldYieldPos || this.yieldPos;
      this.awaitPos = oldAwaitPos || this.awaitPos;
      this.awaitIdentPos = oldAwaitIdentPos || this.awaitIdentPos;
      var node$1 = this.startNodeAt(startPos, startLoc);
      node$1.callee = base;
      node$1.arguments = exprList;
      if (node$1.callee.type === "Import") {
        if (node$1.arguments.length !== 1) {
          this.raise(node$1.start, "import() requires exactly one argument");
        }

        var importArg = node$1.arguments[0];
        if (importArg && importArg.type === "SpreadElement") {
          this.raise(importArg.start, "... is not allowed in import()");
        }
      }
      base = this.finishNode(node$1, "CallExpression");
    } else if (this.type === types.backQuote) {
      var node$2 = this.startNodeAt(startPos, startLoc);
      node$2.tag = base;
      node$2.quasi = this.parseTemplate({isTagged: true});
      base = this.finishNode(node$2, "TaggedTemplateExpression");
    }
    return base
  };

  // Parse an atomic expression — either a single token that is an
  // expression, an expression started by a keyword like `function` or
  // `new`, or an expression wrapped in punctuation like `()`, `[]`,
  // or `{}`.

  pp$3.parseExprAtom = function(refDestructuringErrors) {
    // If a division operator appears in an expression position, the
    // tokenizer got confused, and we force it to read a regexp instead.
    if (this.type === types.slash) { this.readRegexp(); }

    var node, canBeArrow = this.potentialArrowAt === this.start;
    switch (this.type) {
    case types._super:
      if (!this.allowSuper)
        { this.raise(this.start, "'super' keyword outside a method"); }
      node = this.startNode();
      this.next();
      if (this.type === types.parenL && !this.allowDirectSuper)
        { this.raise(node.start, "super() call outside constructor of a subclass"); }
      // The `super` keyword can appear at below:
      // SuperProperty:
      //     super [ Expression ]
      //     super . IdentifierName
      // SuperCall:
      //     super Arguments
      if (this.type !== types.dot && this.type !== types.bracketL && this.type !== types.parenL)
        { this.unexpected(); }
      return this.finishNode(node, "Super")

    case types._this:
      node = this.startNode();
      this.next();
      return this.finishNode(node, "ThisExpression")

    case types.name:
      var startPos = this.start, startLoc = this.startLoc, containsEsc = this.containsEsc;
      var id = this.parseIdent(false);
      if (this.options.ecmaVersion >= 8 && !containsEsc && id.name === "async" && !this.canInsertSemicolon() && this.eat(types._function))
        { return this.parseFunction(this.startNodeAt(startPos, startLoc), 0, false, true) }
      if (canBeArrow && !this.canInsertSemicolon()) {
        if (this.eat(types.arrow))
          { return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), [id], false) }
        if (this.options.ecmaVersion >= 8 && id.name === "async" && this.type === types.name && !containsEsc) {
          id = this.parseIdent(false);
          if (this.canInsertSemicolon() || !this.eat(types.arrow))
            { this.unexpected(); }
          return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), [id], true)
        }
      }
      return id

    case types.regexp:
      var value = this.value;
      node = this.parseLiteral(value.value);
      node.regex = {pattern: value.pattern, flags: value.flags};
      return node

    case types.num: case types.string:
      return this.parseLiteral(this.value)

    case types._null: case types._true: case types._false:
      node = this.startNode();
      node.value = this.type === types._null ? null : this.type === types._true;
      node.raw = this.type.keyword;
      this.next();
      return this.finishNode(node, "Literal")

    case types.parenL:
      var start = this.start, expr = this.parseParenAndDistinguishExpression(canBeArrow);
      if (refDestructuringErrors) {
        if (refDestructuringErrors.parenthesizedAssign < 0 && !this.isSimpleAssignTarget(expr))
          { refDestructuringErrors.parenthesizedAssign = start; }
        if (refDestructuringErrors.parenthesizedBind < 0)
          { refDestructuringErrors.parenthesizedBind = start; }
      }
      return expr

    case types.bracketL:
      node = this.startNode();
      this.next();
      node.elements = this.parseExprList(types.bracketR, true, true, refDestructuringErrors);
      return this.finishNode(node, "ArrayExpression")

    case types.braceL:
      return this.parseObj(false, refDestructuringErrors)

    case types._function:
      node = this.startNode();
      this.next();
      return this.parseFunction(node, 0)

    case types._class:
      return this.parseClass(this.startNode(), false)

    case types._new:
      return this.parseNew()

    case types.backQuote:
      return this.parseTemplate()

    case types._import:
      if (this.options.ecmaVersion > 10) {
        return this.parseDynamicImport()
      } else {
        return this.unexpected()
      }

    default:
      this.unexpected();
    }
  };

  pp$3.parseDynamicImport = function() {
    var node = this.startNode();
    this.next();
    if (this.type !== types.parenL) {
      this.unexpected();
    }
    return this.finishNode(node, "Import")
  };

  pp$3.parseLiteral = function(value) {
    var node = this.startNode();
    node.value = value;
    node.raw = this.input.slice(this.start, this.end);
    if (node.raw.charCodeAt(node.raw.length - 1) === 110) { node.bigint = node.raw.slice(0, -1); }
    this.next();
    return this.finishNode(node, "Literal")
  };

  pp$3.parseParenExpression = function() {
    this.expect(types.parenL);
    var val = this.parseExpression();
    this.expect(types.parenR);
    return val
  };

  pp$3.parseParenAndDistinguishExpression = function(canBeArrow) {
    var startPos = this.start, startLoc = this.startLoc, val, allowTrailingComma = this.options.ecmaVersion >= 8;
    if (this.options.ecmaVersion >= 6) {
      this.next();

      var innerStartPos = this.start, innerStartLoc = this.startLoc;
      var exprList = [], first = true, lastIsComma = false;
      var refDestructuringErrors = new DestructuringErrors, oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, spreadStart;
      this.yieldPos = 0;
      this.awaitPos = 0;
      // Do not save awaitIdentPos to allow checking awaits nested in parameters
      while (this.type !== types.parenR) {
        first ? first = false : this.expect(types.comma);
        if (allowTrailingComma && this.afterTrailingComma(types.parenR, true)) {
          lastIsComma = true;
          break
        } else if (this.type === types.ellipsis) {
          spreadStart = this.start;
          exprList.push(this.parseParenItem(this.parseRestBinding()));
          if (this.type === types.comma) { this.raise(this.start, "Comma is not permitted after the rest element"); }
          break
        } else {
          exprList.push(this.parseMaybeAssign(false, refDestructuringErrors, this.parseParenItem));
        }
      }
      var innerEndPos = this.start, innerEndLoc = this.startLoc;
      this.expect(types.parenR);

      if (canBeArrow && !this.canInsertSemicolon() && this.eat(types.arrow)) {
        this.checkPatternErrors(refDestructuringErrors, false);
        this.checkYieldAwaitInDefaultParams();
        this.yieldPos = oldYieldPos;
        this.awaitPos = oldAwaitPos;
        return this.parseParenArrowList(startPos, startLoc, exprList)
      }

      if (!exprList.length || lastIsComma) { this.unexpected(this.lastTokStart); }
      if (spreadStart) { this.unexpected(spreadStart); }
      this.checkExpressionErrors(refDestructuringErrors, true);
      this.yieldPos = oldYieldPos || this.yieldPos;
      this.awaitPos = oldAwaitPos || this.awaitPos;

      if (exprList.length > 1) {
        val = this.startNodeAt(innerStartPos, innerStartLoc);
        val.expressions = exprList;
        this.finishNodeAt(val, "SequenceExpression", innerEndPos, innerEndLoc);
      } else {
        val = exprList[0];
      }
    } else {
      val = this.parseParenExpression();
    }

    if (this.options.preserveParens) {
      var par = this.startNodeAt(startPos, startLoc);
      par.expression = val;
      return this.finishNode(par, "ParenthesizedExpression")
    } else {
      return val
    }
  };

  pp$3.parseParenItem = function(item) {
    return item
  };

  pp$3.parseParenArrowList = function(startPos, startLoc, exprList) {
    return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), exprList)
  };

  // New's precedence is slightly tricky. It must allow its argument to
  // be a `[]` or dot subscript expression, but not a call — at least,
  // not without wrapping it in parentheses. Thus, it uses the noCalls
  // argument to parseSubscripts to prevent it from consuming the
  // argument list.

  var empty$1 = [];

  pp$3.parseNew = function() {
    var node = this.startNode();
    var meta = this.parseIdent(true);
    if (this.options.ecmaVersion >= 6 && this.eat(types.dot)) {
      node.meta = meta;
      var containsEsc = this.containsEsc;
      node.property = this.parseIdent(true);
      if (node.property.name !== "target" || containsEsc)
        { this.raiseRecoverable(node.property.start, "The only valid meta property for new is new.target"); }
      if (!this.inNonArrowFunction())
        { this.raiseRecoverable(node.start, "new.target can only be used in functions"); }
      return this.finishNode(node, "MetaProperty")
    }
    var startPos = this.start, startLoc = this.startLoc;
    node.callee = this.parseSubscripts(this.parseExprAtom(), startPos, startLoc, true);
    if (this.options.ecmaVersion > 10 && node.callee.type === "Import") {
      this.raise(node.callee.start, "Cannot use new with import(...)");
    }
    if (this.eat(types.parenL)) { node.arguments = this.parseExprList(types.parenR, this.options.ecmaVersion >= 8 && node.callee.type !== "Import", false); }
    else { node.arguments = empty$1; }
    return this.finishNode(node, "NewExpression")
  };

  // Parse template expression.

  pp$3.parseTemplateElement = function(ref) {
    var isTagged = ref.isTagged;

    var elem = this.startNode();
    if (this.type === types.invalidTemplate) {
      if (!isTagged) {
        this.raiseRecoverable(this.start, "Bad escape sequence in untagged template literal");
      }
      elem.value = {
        raw: this.value,
        cooked: null
      };
    } else {
      elem.value = {
        raw: this.input.slice(this.start, this.end).replace(/\r\n?/g, "\n"),
        cooked: this.value
      };
    }
    this.next();
    elem.tail = this.type === types.backQuote;
    return this.finishNode(elem, "TemplateElement")
  };

  pp$3.parseTemplate = function(ref) {
    if ( ref === void 0 ) ref = {};
    var isTagged = ref.isTagged; if ( isTagged === void 0 ) isTagged = false;

    var node = this.startNode();
    this.next();
    node.expressions = [];
    var curElt = this.parseTemplateElement({isTagged: isTagged});
    node.quasis = [curElt];
    while (!curElt.tail) {
      if (this.type === types.eof) { this.raise(this.pos, "Unterminated template literal"); }
      this.expect(types.dollarBraceL);
      node.expressions.push(this.parseExpression());
      this.expect(types.braceR);
      node.quasis.push(curElt = this.parseTemplateElement({isTagged: isTagged}));
    }
    this.next();
    return this.finishNode(node, "TemplateLiteral")
  };

  pp$3.isAsyncProp = function(prop) {
    return !prop.computed && prop.key.type === "Identifier" && prop.key.name === "async" &&
      (this.type === types.name || this.type === types.num || this.type === types.string || this.type === types.bracketL || this.type.keyword || (this.options.ecmaVersion >= 9 && this.type === types.star)) &&
      !lineBreak.test(this.input.slice(this.lastTokEnd, this.start))
  };

  // Parse an object literal or binding pattern.

  pp$3.parseObj = function(isPattern, refDestructuringErrors) {
    var node = this.startNode(), first = true, propHash = {};
    node.properties = [];
    this.next();
    while (!this.eat(types.braceR)) {
      if (!first) {
        this.expect(types.comma);
        if (this.afterTrailingComma(types.braceR)) { break }
      } else { first = false; }

      var prop = this.parseProperty(isPattern, refDestructuringErrors);
      if (!isPattern) { this.checkPropClash(prop, propHash, refDestructuringErrors); }
      node.properties.push(prop);
    }
    return this.finishNode(node, isPattern ? "ObjectPattern" : "ObjectExpression")
  };

  pp$3.parseProperty = function(isPattern, refDestructuringErrors) {
    var prop = this.startNode(), isGenerator, isAsync, startPos, startLoc;
    if (this.options.ecmaVersion >= 9 && this.eat(types.ellipsis)) {
      if (isPattern) {
        prop.argument = this.parseIdent(false);
        if (this.type === types.comma) {
          this.raise(this.start, "Comma is not permitted after the rest element");
        }
        return this.finishNode(prop, "RestElement")
      }
      // To disallow parenthesized identifier via `this.toAssignable()`.
      if (this.type === types.parenL && refDestructuringErrors) {
        if (refDestructuringErrors.parenthesizedAssign < 0) {
          refDestructuringErrors.parenthesizedAssign = this.start;
        }
        if (refDestructuringErrors.parenthesizedBind < 0) {
          refDestructuringErrors.parenthesizedBind = this.start;
        }
      }
      // Parse argument.
      prop.argument = this.parseMaybeAssign(false, refDestructuringErrors);
      // To disallow trailing comma via `this.toAssignable()`.
      if (this.type === types.comma && refDestructuringErrors && refDestructuringErrors.trailingComma < 0) {
        refDestructuringErrors.trailingComma = this.start;
      }
      // Finish
      return this.finishNode(prop, "SpreadElement")
    }
    if (this.options.ecmaVersion >= 6) {
      prop.method = false;
      prop.shorthand = false;
      if (isPattern || refDestructuringErrors) {
        startPos = this.start;
        startLoc = this.startLoc;
      }
      if (!isPattern)
        { isGenerator = this.eat(types.star); }
    }
    var containsEsc = this.containsEsc;
    this.parsePropertyName(prop);
    if (!isPattern && !containsEsc && this.options.ecmaVersion >= 8 && !isGenerator && this.isAsyncProp(prop)) {
      isAsync = true;
      isGenerator = this.options.ecmaVersion >= 9 && this.eat(types.star);
      this.parsePropertyName(prop, refDestructuringErrors);
    } else {
      isAsync = false;
    }
    this.parsePropertyValue(prop, isPattern, isGenerator, isAsync, startPos, startLoc, refDestructuringErrors, containsEsc);
    return this.finishNode(prop, "Property")
  };

  pp$3.parsePropertyValue = function(prop, isPattern, isGenerator, isAsync, startPos, startLoc, refDestructuringErrors, containsEsc) {
    if ((isGenerator || isAsync) && this.type === types.colon)
      { this.unexpected(); }

    if (this.eat(types.colon)) {
      prop.value = isPattern ? this.parseMaybeDefault(this.start, this.startLoc) : this.parseMaybeAssign(false, refDestructuringErrors);
      prop.kind = "init";
    } else if (this.options.ecmaVersion >= 6 && this.type === types.parenL) {
      if (isPattern) { this.unexpected(); }
      prop.kind = "init";
      prop.method = true;
      prop.value = this.parseMethod(isGenerator, isAsync);
    } else if (!isPattern && !containsEsc &&
               this.options.ecmaVersion >= 5 && !prop.computed && prop.key.type === "Identifier" &&
               (prop.key.name === "get" || prop.key.name === "set") &&
               (this.type !== types.comma && this.type !== types.braceR)) {
      if (isGenerator || isAsync) { this.unexpected(); }
      prop.kind = prop.key.name;
      this.parsePropertyName(prop);
      prop.value = this.parseMethod(false);
      var paramCount = prop.kind === "get" ? 0 : 1;
      if (prop.value.params.length !== paramCount) {
        var start = prop.value.start;
        if (prop.kind === "get")
          { this.raiseRecoverable(start, "getter should have no params"); }
        else
          { this.raiseRecoverable(start, "setter should have exactly one param"); }
      } else {
        if (prop.kind === "set" && prop.value.params[0].type === "RestElement")
          { this.raiseRecoverable(prop.value.params[0].start, "Setter cannot use rest params"); }
      }
    } else if (this.options.ecmaVersion >= 6 && !prop.computed && prop.key.type === "Identifier") {
      if (isGenerator || isAsync) { this.unexpected(); }
      this.checkUnreserved(prop.key);
      if (prop.key.name === "await" && !this.awaitIdentPos)
        { this.awaitIdentPos = startPos; }
      prop.kind = "init";
      if (isPattern) {
        prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key);
      } else if (this.type === types.eq && refDestructuringErrors) {
        if (refDestructuringErrors.shorthandAssign < 0)
          { refDestructuringErrors.shorthandAssign = this.start; }
        prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key);
      } else {
        prop.value = prop.key;
      }
      prop.shorthand = true;
    } else { this.unexpected(); }
  };

  pp$3.parsePropertyName = function(prop) {
    if (this.options.ecmaVersion >= 6) {
      if (this.eat(types.bracketL)) {
        prop.computed = true;
        prop.key = this.parseMaybeAssign();
        this.expect(types.bracketR);
        return prop.key
      } else {
        prop.computed = false;
      }
    }
    return prop.key = this.type === types.num || this.type === types.string ? this.parseExprAtom() : this.parseIdent(this.options.allowReserved !== "never")
  };

  // Initialize empty function node.

  pp$3.initFunction = function(node) {
    node.id = null;
    if (this.options.ecmaVersion >= 6) { node.generator = node.expression = false; }
    if (this.options.ecmaVersion >= 8) { node.async = false; }
  };

  // Parse object or class method.

  pp$3.parseMethod = function(isGenerator, isAsync, allowDirectSuper) {
    var node = this.startNode(), oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;

    this.initFunction(node);
    if (this.options.ecmaVersion >= 6)
      { node.generator = isGenerator; }
    if (this.options.ecmaVersion >= 8)
      { node.async = !!isAsync; }

    this.yieldPos = 0;
    this.awaitPos = 0;
    this.awaitIdentPos = 0;
    this.enterScope(functionFlags(isAsync, node.generator) | SCOPE_SUPER | (allowDirectSuper ? SCOPE_DIRECT_SUPER : 0));

    this.expect(types.parenL);
    node.params = this.parseBindingList(types.parenR, false, this.options.ecmaVersion >= 8);
    this.checkYieldAwaitInDefaultParams();
    this.parseFunctionBody(node, false, true);

    this.yieldPos = oldYieldPos;
    this.awaitPos = oldAwaitPos;
    this.awaitIdentPos = oldAwaitIdentPos;
    return this.finishNode(node, "FunctionExpression")
  };

  // Parse arrow function expression with given parameters.

  pp$3.parseArrowExpression = function(node, params, isAsync) {
    var oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos, oldAwaitIdentPos = this.awaitIdentPos;

    this.enterScope(functionFlags(isAsync, false) | SCOPE_ARROW);
    this.initFunction(node);
    if (this.options.ecmaVersion >= 8) { node.async = !!isAsync; }

    this.yieldPos = 0;
    this.awaitPos = 0;
    this.awaitIdentPos = 0;

    node.params = this.toAssignableList(params, true);
    this.parseFunctionBody(node, true, false);

    this.yieldPos = oldYieldPos;
    this.awaitPos = oldAwaitPos;
    this.awaitIdentPos = oldAwaitIdentPos;
    return this.finishNode(node, "ArrowFunctionExpression")
  };

  // Parse function body and check parameters.

  pp$3.parseFunctionBody = function(node, isArrowFunction, isMethod) {
    var isExpression = isArrowFunction && this.type !== types.braceL;
    var oldStrict = this.strict, useStrict = false;

    if (isExpression) {
      node.body = this.parseMaybeAssign();
      node.expression = true;
      this.checkParams(node, false);
    } else {
      var nonSimple = this.options.ecmaVersion >= 7 && !this.isSimpleParamList(node.params);
      if (!oldStrict || nonSimple) {
        useStrict = this.strictDirective(this.end);
        // If this is a strict mode function, verify that argument names
        // are not repeated, and it does not try to bind the words `eval`
        // or `arguments`.
        if (useStrict && nonSimple)
          { this.raiseRecoverable(node.start, "Illegal 'use strict' directive in function with non-simple parameter list"); }
      }
      // Start a new scope with regard to labels and the `inFunction`
      // flag (restore them to their old value afterwards).
      var oldLabels = this.labels;
      this.labels = [];
      if (useStrict) { this.strict = true; }

      // Add the params to varDeclaredNames to ensure that an error is thrown
      // if a let/const declaration in the function clashes with one of the params.
      this.checkParams(node, !oldStrict && !useStrict && !isArrowFunction && !isMethod && this.isSimpleParamList(node.params));
      node.body = this.parseBlock(false);
      node.expression = false;
      this.adaptDirectivePrologue(node.body.body);
      this.labels = oldLabels;
    }
    this.exitScope();

    // Ensure the function name isn't a forbidden identifier in strict mode, e.g. 'eval'
    if (this.strict && node.id) { this.checkLVal(node.id, BIND_OUTSIDE); }
    this.strict = oldStrict;
  };

  pp$3.isSimpleParamList = function(params) {
    for (var i = 0, list = params; i < list.length; i += 1)
      {
      var param = list[i];

      if (param.type !== "Identifier") { return false
    } }
    return true
  };

  // Checks function params for various disallowed patterns such as using "eval"
  // or "arguments" and duplicate parameters.

  pp$3.checkParams = function(node, allowDuplicates) {
    var nameHash = {};
    for (var i = 0, list = node.params; i < list.length; i += 1)
      {
      var param = list[i];

      this.checkLVal(param, BIND_VAR, allowDuplicates ? null : nameHash);
    }
  };

  // Parses a comma-separated list of expressions, and returns them as
  // an array. `close` is the token type that ends the list, and
  // `allowEmpty` can be turned on to allow subsequent commas with
  // nothing in between them to be parsed as `null` (which is needed
  // for array literals).

  pp$3.parseExprList = function(close, allowTrailingComma, allowEmpty, refDestructuringErrors) {
    var elts = [], first = true;
    while (!this.eat(close)) {
      if (!first) {
        this.expect(types.comma);
        if (allowTrailingComma && this.afterTrailingComma(close)) { break }
      } else { first = false; }

      var elt = (void 0);
      if (allowEmpty && this.type === types.comma)
        { elt = null; }
      else if (this.type === types.ellipsis) {
        elt = this.parseSpread(refDestructuringErrors);
        if (refDestructuringErrors && this.type === types.comma && refDestructuringErrors.trailingComma < 0)
          { refDestructuringErrors.trailingComma = this.start; }
      } else {
        elt = this.parseMaybeAssign(false, refDestructuringErrors);
      }
      elts.push(elt);
    }
    return elts
  };

  pp$3.checkUnreserved = function(ref) {
    var start = ref.start;
    var end = ref.end;
    var name = ref.name;

    if (this.inGenerator && name === "yield")
      { this.raiseRecoverable(start, "Cannot use 'yield' as identifier inside a generator"); }
    if (this.inAsync && name === "await")
      { this.raiseRecoverable(start, "Cannot use 'await' as identifier inside an async function"); }
    if (this.keywords.test(name))
      { this.raise(start, ("Unexpected keyword '" + name + "'")); }
    if (this.options.ecmaVersion < 6 &&
      this.input.slice(start, end).indexOf("\\") !== -1) { return }
    var re = this.strict ? this.reservedWordsStrict : this.reservedWords;
    if (re.test(name)) {
      if (!this.inAsync && name === "await")
        { this.raiseRecoverable(start, "Cannot use keyword 'await' outside an async function"); }
      this.raiseRecoverable(start, ("The keyword '" + name + "' is reserved"));
    }
  };

  // Parse the next token as an identifier. If `liberal` is true (used
  // when parsing properties), it will also convert keywords into
  // identifiers.

  pp$3.parseIdent = function(liberal, isBinding) {
    var node = this.startNode();
    if (this.type === types.name) {
      node.name = this.value;
    } else if (this.type.keyword) {
      node.name = this.type.keyword;

      // To fix https://github.com/acornjs/acorn/issues/575
      // `class` and `function` keywords push new context into this.context.
      // But there is no chance to pop the context if the keyword is consumed as an identifier such as a property name.
      // If the previous token is a dot, this does not apply because the context-managing code already ignored the keyword
      if ((node.name === "class" || node.name === "function") &&
          (this.lastTokEnd !== this.lastTokStart + 1 || this.input.charCodeAt(this.lastTokStart) !== 46)) {
        this.context.pop();
      }
    } else {
      this.unexpected();
    }
    this.next();
    this.finishNode(node, "Identifier");
    if (!liberal) {
      this.checkUnreserved(node);
      if (node.name === "await" && !this.awaitIdentPos)
        { this.awaitIdentPos = node.start; }
    }
    return node
  };

  // Parses yield expression inside generator.

  pp$3.parseYield = function(noIn) {
    if (!this.yieldPos) { this.yieldPos = this.start; }

    var node = this.startNode();
    this.next();
    if (this.type === types.semi || this.canInsertSemicolon() || (this.type !== types.star && !this.type.startsExpr)) {
      node.delegate = false;
      node.argument = null;
    } else {
      node.delegate = this.eat(types.star);
      node.argument = this.parseMaybeAssign(noIn);
    }
    return this.finishNode(node, "YieldExpression")
  };

  pp$3.parseAwait = function() {
    if (!this.awaitPos) { this.awaitPos = this.start; }

    var node = this.startNode();
    this.next();
    node.argument = this.parseMaybeUnary(null, true);
    return this.finishNode(node, "AwaitExpression")
  };

  var pp$4 = Parser.prototype;

  // This function is used to raise exceptions on parse errors. It
  // takes an offset integer (into the current `input`) to indicate
  // the location of the error, attaches the position to the end
  // of the error message, and then raises a `SyntaxError` with that
  // message.

  pp$4.raise = function(pos, message) {
    var loc = getLineInfo(this.input, pos);
    message += " (" + loc.line + ":" + loc.column + ")";
    var err = new SyntaxError(message);
    err.pos = pos; err.loc = loc; err.raisedAt = this.pos;
    throw err
  };

  pp$4.raiseRecoverable = pp$4.raise;

  pp$4.curPosition = function() {
    if (this.options.locations) {
      return new Position(this.curLine, this.pos - this.lineStart)
    }
  };

  var pp$5 = Parser.prototype;

  var Scope = function Scope(flags) {
    this.flags = flags;
    // A list of var-declared names in the current lexical scope
    this.var = [];
    // A list of lexically-declared names in the current lexical scope
    this.lexical = [];
    // A list of lexically-declared FunctionDeclaration names in the current lexical scope
    this.functions = [];
  };

  // The functions in this module keep track of declared variables in the current scope in order to detect duplicate variable names.

  pp$5.enterScope = function(flags) {
    this.scopeStack.push(new Scope(flags));
  };

  pp$5.exitScope = function() {
    this.scopeStack.pop();
  };

  // The spec says:
  // > At the top level of a function, or script, function declarations are
  // > treated like var declarations rather than like lexical declarations.
  pp$5.treatFunctionsAsVarInScope = function(scope) {
    return (scope.flags & SCOPE_FUNCTION) || !this.inModule && (scope.flags & SCOPE_TOP)
  };

  pp$5.declareName = function(name, bindingType, pos) {
    var redeclared = false;
    if (bindingType === BIND_LEXICAL) {
      var scope = this.currentScope();
      redeclared = scope.lexical.indexOf(name) > -1 || scope.functions.indexOf(name) > -1 || scope.var.indexOf(name) > -1;
      scope.lexical.push(name);
      if (this.inModule && (scope.flags & SCOPE_TOP))
        { delete this.undefinedExports[name]; }
    } else if (bindingType === BIND_SIMPLE_CATCH) {
      var scope$1 = this.currentScope();
      scope$1.lexical.push(name);
    } else if (bindingType === BIND_FUNCTION) {
      var scope$2 = this.currentScope();
      if (this.treatFunctionsAsVar)
        { redeclared = scope$2.lexical.indexOf(name) > -1; }
      else
        { redeclared = scope$2.lexical.indexOf(name) > -1 || scope$2.var.indexOf(name) > -1; }
      scope$2.functions.push(name);
    } else {
      for (var i = this.scopeStack.length - 1; i >= 0; --i) {
        var scope$3 = this.scopeStack[i];
        if (scope$3.lexical.indexOf(name) > -1 && !((scope$3.flags & SCOPE_SIMPLE_CATCH) && scope$3.lexical[0] === name) ||
            !this.treatFunctionsAsVarInScope(scope$3) && scope$3.functions.indexOf(name) > -1) {
          redeclared = true;
          break
        }
        scope$3.var.push(name);
        if (this.inModule && (scope$3.flags & SCOPE_TOP))
          { delete this.undefinedExports[name]; }
        if (scope$3.flags & SCOPE_VAR) { break }
      }
    }
    if (redeclared) { this.raiseRecoverable(pos, ("Identifier '" + name + "' has already been declared")); }
  };

  pp$5.checkLocalExport = function(id) {
    // scope.functions must be empty as Module code is always strict.
    if (this.scopeStack[0].lexical.indexOf(id.name) === -1 &&
        this.scopeStack[0].var.indexOf(id.name) === -1) {
      this.undefinedExports[id.name] = id;
    }
  };

  pp$5.currentScope = function() {
    return this.scopeStack[this.scopeStack.length - 1]
  };

  pp$5.currentVarScope = function() {
    for (var i = this.scopeStack.length - 1;; i--) {
      var scope = this.scopeStack[i];
      if (scope.flags & SCOPE_VAR) { return scope }
    }
  };

  // Could be useful for `this`, `new.target`, `super()`, `super.property`, and `super[property]`.
  pp$5.currentThisScope = function() {
    for (var i = this.scopeStack.length - 1;; i--) {
      var scope = this.scopeStack[i];
      if (scope.flags & SCOPE_VAR && !(scope.flags & SCOPE_ARROW)) { return scope }
    }
  };

  var Node = function Node(parser, pos, loc) {
    this.type = "";
    this.start = pos;
    this.end = 0;
    if (parser.options.locations)
      { this.loc = new SourceLocation(parser, loc); }
    if (parser.options.directSourceFile)
      { this.sourceFile = parser.options.directSourceFile; }
    if (parser.options.ranges)
      { this.range = [pos, 0]; }
  };

  // Start an AST node, attaching a start offset.

  var pp$6 = Parser.prototype;

  pp$6.startNode = function() {
    return new Node(this, this.start, this.startLoc)
  };

  pp$6.startNodeAt = function(pos, loc) {
    return new Node(this, pos, loc)
  };

  // Finish an AST node, adding `type` and `end` properties.

  function finishNodeAt(node, type, pos, loc) {
    node.type = type;
    node.end = pos;
    if (this.options.locations)
      { node.loc.end = loc; }
    if (this.options.ranges)
      { node.range[1] = pos; }
    return node
  }

  pp$6.finishNode = function(node, type) {
    return finishNodeAt.call(this, node, type, this.lastTokEnd, this.lastTokEndLoc)
  };

  // Finish node at given position

  pp$6.finishNodeAt = function(node, type, pos, loc) {
    return finishNodeAt.call(this, node, type, pos, loc)
  };

  // The algorithm used to determine whether a regexp can appear at a

  var TokContext = function TokContext(token, isExpr, preserveSpace, override, generator) {
    this.token = token;
    this.isExpr = !!isExpr;
    this.preserveSpace = !!preserveSpace;
    this.override = override;
    this.generator = !!generator;
  };

  var types$1 = {
    b_stat: new TokContext("{", false),
    b_expr: new TokContext("{", true),
    b_tmpl: new TokContext("${", false),
    p_stat: new TokContext("(", false),
    p_expr: new TokContext("(", true),
    q_tmpl: new TokContext("`", true, true, function (p) { return p.tryReadTemplateToken(); }),
    f_stat: new TokContext("function", false),
    f_expr: new TokContext("function", true),
    f_expr_gen: new TokContext("function", true, false, null, true),
    f_gen: new TokContext("function", false, false, null, true)
  };

  var pp$7 = Parser.prototype;

  pp$7.initialContext = function() {
    return [types$1.b_stat]
  };

  pp$7.braceIsBlock = function(prevType) {
    var parent = this.curContext();
    if (parent === types$1.f_expr || parent === types$1.f_stat)
      { return true }
    if (prevType === types.colon && (parent === types$1.b_stat || parent === types$1.b_expr))
      { return !parent.isExpr }

    // The check for `tt.name && exprAllowed` detects whether we are
    // after a `yield` or `of` construct. See the `updateContext` for
    // `tt.name`.
    if (prevType === types._return || prevType === types.name && this.exprAllowed)
      { return lineBreak.test(this.input.slice(this.lastTokEnd, this.start)) }
    if (prevType === types._else || prevType === types.semi || prevType === types.eof || prevType === types.parenR || prevType === types.arrow)
      { return true }
    if (prevType === types.braceL)
      { return parent === types$1.b_stat }
    if (prevType === types._var || prevType === types._const || prevType === types.name)
      { return false }
    return !this.exprAllowed
  };

  pp$7.inGeneratorContext = function() {
    for (var i = this.context.length - 1; i >= 1; i--) {
      var context = this.context[i];
      if (context.token === "function")
        { return context.generator }
    }
    return false
  };

  pp$7.updateContext = function(prevType) {
    var update, type = this.type;
    if (type.keyword && prevType === types.dot)
      { this.exprAllowed = false; }
    else if (update = type.updateContext)
      { update.call(this, prevType); }
    else
      { this.exprAllowed = type.beforeExpr; }
  };

  // Token-specific context update code

  types.parenR.updateContext = types.braceR.updateContext = function() {
    if (this.context.length === 1) {
      this.exprAllowed = true;
      return
    }
    var out = this.context.pop();
    if (out === types$1.b_stat && this.curContext().token === "function") {
      out = this.context.pop();
    }
    this.exprAllowed = !out.isExpr;
  };

  types.braceL.updateContext = function(prevType) {
    this.context.push(this.braceIsBlock(prevType) ? types$1.b_stat : types$1.b_expr);
    this.exprAllowed = true;
  };

  types.dollarBraceL.updateContext = function() {
    this.context.push(types$1.b_tmpl);
    this.exprAllowed = true;
  };

  types.parenL.updateContext = function(prevType) {
    var statementParens = prevType === types._if || prevType === types._for || prevType === types._with || prevType === types._while;
    this.context.push(statementParens ? types$1.p_stat : types$1.p_expr);
    this.exprAllowed = true;
  };

  types.incDec.updateContext = function() {
    // tokExprAllowed stays unchanged
  };

  types._function.updateContext = types._class.updateContext = function(prevType) {
    if (prevType.beforeExpr && prevType !== types.semi && prevType !== types._else &&
        !(prevType === types._return && lineBreak.test(this.input.slice(this.lastTokEnd, this.start))) &&
        !((prevType === types.colon || prevType === types.braceL) && this.curContext() === types$1.b_stat))
      { this.context.push(types$1.f_expr); }
    else
      { this.context.push(types$1.f_stat); }
    this.exprAllowed = false;
  };

  types.backQuote.updateContext = function() {
    if (this.curContext() === types$1.q_tmpl)
      { this.context.pop(); }
    else
      { this.context.push(types$1.q_tmpl); }
    this.exprAllowed = false;
  };

  types.star.updateContext = function(prevType) {
    if (prevType === types._function) {
      var index = this.context.length - 1;
      if (this.context[index] === types$1.f_expr)
        { this.context[index] = types$1.f_expr_gen; }
      else
        { this.context[index] = types$1.f_gen; }
    }
    this.exprAllowed = true;
  };

  types.name.updateContext = function(prevType) {
    var allowed = false;
    if (this.options.ecmaVersion >= 6 && prevType !== types.dot) {
      if (this.value === "of" && !this.exprAllowed ||
          this.value === "yield" && this.inGeneratorContext())
        { allowed = true; }
    }
    this.exprAllowed = allowed;
  };

  // This file contains Unicode properties extracted from the ECMAScript
  // specification. The lists are extracted like so:
  // $$('#table-binary-unicode-properties > figure > table > tbody > tr > td:nth-child(1) code').map(el => el.innerText)

  // #table-binary-unicode-properties
  var ecma9BinaryProperties = "ASCII ASCII_Hex_Digit AHex Alphabetic Alpha Any Assigned Bidi_Control Bidi_C Bidi_Mirrored Bidi_M Case_Ignorable CI Cased Changes_When_Casefolded CWCF Changes_When_Casemapped CWCM Changes_When_Lowercased CWL Changes_When_NFKC_Casefolded CWKCF Changes_When_Titlecased CWT Changes_When_Uppercased CWU Dash Default_Ignorable_Code_Point DI Deprecated Dep Diacritic Dia Emoji Emoji_Component Emoji_Modifier Emoji_Modifier_Base Emoji_Presentation Extender Ext Grapheme_Base Gr_Base Grapheme_Extend Gr_Ext Hex_Digit Hex IDS_Binary_Operator IDSB IDS_Trinary_Operator IDST ID_Continue IDC ID_Start IDS Ideographic Ideo Join_Control Join_C Logical_Order_Exception LOE Lowercase Lower Math Noncharacter_Code_Point NChar Pattern_Syntax Pat_Syn Pattern_White_Space Pat_WS Quotation_Mark QMark Radical Regional_Indicator RI Sentence_Terminal STerm Soft_Dotted SD Terminal_Punctuation Term Unified_Ideograph UIdeo Uppercase Upper Variation_Selector VS White_Space space XID_Continue XIDC XID_Start XIDS";
  var ecma10BinaryProperties = ecma9BinaryProperties + " Extended_Pictographic";
  var ecma11BinaryProperties = ecma10BinaryProperties;
  var unicodeBinaryProperties = {
    9: ecma9BinaryProperties,
    10: ecma10BinaryProperties,
    11: ecma11BinaryProperties
  };

  // #table-unicode-general-category-values
  var unicodeGeneralCategoryValues = "Cased_Letter LC Close_Punctuation Pe Connector_Punctuation Pc Control Cc cntrl Currency_Symbol Sc Dash_Punctuation Pd Decimal_Number Nd digit Enclosing_Mark Me Final_Punctuation Pf Format Cf Initial_Punctuation Pi Letter L Letter_Number Nl Line_Separator Zl Lowercase_Letter Ll Mark M Combining_Mark Math_Symbol Sm Modifier_Letter Lm Modifier_Symbol Sk Nonspacing_Mark Mn Number N Open_Punctuation Ps Other C Other_Letter Lo Other_Number No Other_Punctuation Po Other_Symbol So Paragraph_Separator Zp Private_Use Co Punctuation P punct Separator Z Space_Separator Zs Spacing_Mark Mc Surrogate Cs Symbol S Titlecase_Letter Lt Unassigned Cn Uppercase_Letter Lu";

  // #table-unicode-script-values
  var ecma9ScriptValues = "Adlam Adlm Ahom Ahom Anatolian_Hieroglyphs Hluw Arabic Arab Armenian Armn Avestan Avst Balinese Bali Bamum Bamu Bassa_Vah Bass Batak Batk Bengali Beng Bhaiksuki Bhks Bopomofo Bopo Brahmi Brah Braille Brai Buginese Bugi Buhid Buhd Canadian_Aboriginal Cans Carian Cari Caucasian_Albanian Aghb Chakma Cakm Cham Cham Cherokee Cher Common Zyyy Coptic Copt Qaac Cuneiform Xsux Cypriot Cprt Cyrillic Cyrl Deseret Dsrt Devanagari Deva Duployan Dupl Egyptian_Hieroglyphs Egyp Elbasan Elba Ethiopic Ethi Georgian Geor Glagolitic Glag Gothic Goth Grantha Gran Greek Grek Gujarati Gujr Gurmukhi Guru Han Hani Hangul Hang Hanunoo Hano Hatran Hatr Hebrew Hebr Hiragana Hira Imperial_Aramaic Armi Inherited Zinh Qaai Inscriptional_Pahlavi Phli Inscriptional_Parthian Prti Javanese Java Kaithi Kthi Kannada Knda Katakana Kana Kayah_Li Kali Kharoshthi Khar Khmer Khmr Khojki Khoj Khudawadi Sind Lao Laoo Latin Latn Lepcha Lepc Limbu Limb Linear_A Lina Linear_B Linb Lisu Lisu Lycian Lyci Lydian Lydi Mahajani Mahj Malayalam Mlym Mandaic Mand Manichaean Mani Marchen Marc Masaram_Gondi Gonm Meetei_Mayek Mtei Mende_Kikakui Mend Meroitic_Cursive Merc Meroitic_Hieroglyphs Mero Miao Plrd Modi Modi Mongolian Mong Mro Mroo Multani Mult Myanmar Mymr Nabataean Nbat New_Tai_Lue Talu Newa Newa Nko Nkoo Nushu Nshu Ogham Ogam Ol_Chiki Olck Old_Hungarian Hung Old_Italic Ital Old_North_Arabian Narb Old_Permic Perm Old_Persian Xpeo Old_South_Arabian Sarb Old_Turkic Orkh Oriya Orya Osage Osge Osmanya Osma Pahawh_Hmong Hmng Palmyrene Palm Pau_Cin_Hau Pauc Phags_Pa Phag Phoenician Phnx Psalter_Pahlavi Phlp Rejang Rjng Runic Runr Samaritan Samr Saurashtra Saur Sharada Shrd Shavian Shaw Siddham Sidd SignWriting Sgnw Sinhala Sinh Sora_Sompeng Sora Soyombo Soyo Sundanese Sund Syloti_Nagri Sylo Syriac Syrc Tagalog Tglg Tagbanwa Tagb Tai_Le Tale Tai_Tham Lana Tai_Viet Tavt Takri Takr Tamil Taml Tangut Tang Telugu Telu Thaana Thaa Thai Thai Tibetan Tibt Tifinagh Tfng Tirhuta Tirh Ugaritic Ugar Vai Vaii Warang_Citi Wara Yi Yiii Zanabazar_Square Zanb";
  var ecma10ScriptValues = ecma9ScriptValues + " Dogra Dogr Gunjala_Gondi Gong Hanifi_Rohingya Rohg Makasar Maka Medefaidrin Medf Old_Sogdian Sogo Sogdian Sogd";
  var ecma11ScriptValues = ecma10ScriptValues + " Elymaic Elym Nandinagari Nand Nyiakeng_Puachue_Hmong Hmnp Wancho Wcho";
  var unicodeScriptValues = {
    9: ecma9ScriptValues,
    10: ecma10ScriptValues,
    11: ecma11ScriptValues
  };

  var data = {};
  function buildUnicodeData(ecmaVersion) {
    var d = data[ecmaVersion] = {
      binary: wordsRegexp(unicodeBinaryProperties[ecmaVersion] + " " + unicodeGeneralCategoryValues),
      nonBinary: {
        General_Category: wordsRegexp(unicodeGeneralCategoryValues),
        Script: wordsRegexp(unicodeScriptValues[ecmaVersion])
      }
    };
    d.nonBinary.Script_Extensions = d.nonBinary.Script;

    d.nonBinary.gc = d.nonBinary.General_Category;
    d.nonBinary.sc = d.nonBinary.Script;
    d.nonBinary.scx = d.nonBinary.Script_Extensions;
  }
  buildUnicodeData(9);
  buildUnicodeData(10);
  buildUnicodeData(11);

  var pp$8 = Parser.prototype;

  var RegExpValidationState = function RegExpValidationState(parser) {
    this.parser = parser;
    this.validFlags = "gim" + (parser.options.ecmaVersion >= 6 ? "uy" : "") + (parser.options.ecmaVersion >= 9 ? "s" : "");
    this.unicodeProperties = data[parser.options.ecmaVersion >= 11 ? 11 : parser.options.ecmaVersion];
    this.source = "";
    this.flags = "";
    this.start = 0;
    this.switchU = false;
    this.switchN = false;
    this.pos = 0;
    this.lastIntValue = 0;
    this.lastStringValue = "";
    this.lastAssertionIsQuantifiable = false;
    this.numCapturingParens = 0;
    this.maxBackReference = 0;
    this.groupNames = [];
    this.backReferenceNames = [];
  };

  RegExpValidationState.prototype.reset = function reset (start, pattern, flags) {
    var unicode = flags.indexOf("u") !== -1;
    this.start = start | 0;
    this.source = pattern + "";
    this.flags = flags;
    this.switchU = unicode && this.parser.options.ecmaVersion >= 6;
    this.switchN = unicode && this.parser.options.ecmaVersion >= 9;
  };

  RegExpValidationState.prototype.raise = function raise (message) {
    this.parser.raiseRecoverable(this.start, ("Invalid regular expression: /" + (this.source) + "/: " + message));
  };

  // If u flag is given, this returns the code point at the index (it combines a surrogate pair).
  // Otherwise, this returns the code unit of the index (can be a part of a surrogate pair).
  RegExpValidationState.prototype.at = function at (i) {
    var s = this.source;
    var l = s.length;
    if (i >= l) {
      return -1
    }
    var c = s.charCodeAt(i);
    if (!this.switchU || c <= 0xD7FF || c >= 0xE000 || i + 1 >= l) {
      return c
    }
    var next = s.charCodeAt(i + 1);
    return next >= 0xDC00 && next <= 0xDFFF ? (c << 10) + next - 0x35FDC00 : c
  };

  RegExpValidationState.prototype.nextIndex = function nextIndex (i) {
    var s = this.source;
    var l = s.length;
    if (i >= l) {
      return l
    }
    var c = s.charCodeAt(i), next;
    if (!this.switchU || c <= 0xD7FF || c >= 0xE000 || i + 1 >= l ||
        (next = s.charCodeAt(i + 1)) < 0xDC00 || next > 0xDFFF) {
      return i + 1
    }
    return i + 2
  };

  RegExpValidationState.prototype.current = function current () {
    return this.at(this.pos)
  };

  RegExpValidationState.prototype.lookahead = function lookahead () {
    return this.at(this.nextIndex(this.pos))
  };

  RegExpValidationState.prototype.advance = function advance () {
    this.pos = this.nextIndex(this.pos);
  };

  RegExpValidationState.prototype.eat = function eat (ch) {
    if (this.current() === ch) {
      this.advance();
      return true
    }
    return false
  };

  function codePointToString(ch) {
    if (ch <= 0xFFFF) { return String.fromCharCode(ch) }
    ch -= 0x10000;
    return String.fromCharCode((ch >> 10) + 0xD800, (ch & 0x03FF) + 0xDC00)
  }

  /**
   * Validate the flags part of a given RegExpLiteral.
   *
   * @param {RegExpValidationState} state The state to validate RegExp.
   * @returns {void}
   */
  pp$8.validateRegExpFlags = function(state) {
    var validFlags = state.validFlags;
    var flags = state.flags;

    for (var i = 0; i < flags.length; i++) {
      var flag = flags.charAt(i);
      if (validFlags.indexOf(flag) === -1) {
        this.raise(state.start, "Invalid regular expression flag");
      }
      if (flags.indexOf(flag, i + 1) > -1) {
        this.raise(state.start, "Duplicate regular expression flag");
      }
    }
  };

  /**
   * Validate the pattern part of a given RegExpLiteral.
   *
   * @param {RegExpValidationState} state The state to validate RegExp.
   * @returns {void}
   */
  pp$8.validateRegExpPattern = function(state) {
    this.regexp_pattern(state);

    // The goal symbol for the parse is |Pattern[~U, ~N]|. If the result of
    // parsing contains a |GroupName|, reparse with the goal symbol
    // |Pattern[~U, +N]| and use this result instead. Throw a *SyntaxError*
    // exception if _P_ did not conform to the grammar, if any elements of _P_
    // were not matched by the parse, or if any Early Error conditions exist.
    if (!state.switchN && this.options.ecmaVersion >= 9 && state.groupNames.length > 0) {
      state.switchN = true;
      this.regexp_pattern(state);
    }
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-Pattern
  pp$8.regexp_pattern = function(state) {
    state.pos = 0;
    state.lastIntValue = 0;
    state.lastStringValue = "";
    state.lastAssertionIsQuantifiable = false;
    state.numCapturingParens = 0;
    state.maxBackReference = 0;
    state.groupNames.length = 0;
    state.backReferenceNames.length = 0;

    this.regexp_disjunction(state);

    if (state.pos !== state.source.length) {
      // Make the same messages as V8.
      if (state.eat(0x29 /* ) */)) {
        state.raise("Unmatched ')'");
      }
      if (state.eat(0x5D /* [ */) || state.eat(0x7D /* } */)) {
        state.raise("Lone quantifier brackets");
      }
    }
    if (state.maxBackReference > state.numCapturingParens) {
      state.raise("Invalid escape");
    }
    for (var i = 0, list = state.backReferenceNames; i < list.length; i += 1) {
      var name = list[i];

      if (state.groupNames.indexOf(name) === -1) {
        state.raise("Invalid named capture referenced");
      }
    }
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-Disjunction
  pp$8.regexp_disjunction = function(state) {
    this.regexp_alternative(state);
    while (state.eat(0x7C /* | */)) {
      this.regexp_alternative(state);
    }

    // Make the same message as V8.
    if (this.regexp_eatQuantifier(state, true)) {
      state.raise("Nothing to repeat");
    }
    if (state.eat(0x7B /* { */)) {
      state.raise("Lone quantifier brackets");
    }
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-Alternative
  pp$8.regexp_alternative = function(state) {
    while (state.pos < state.source.length && this.regexp_eatTerm(state))
      { }
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-Term
  pp$8.regexp_eatTerm = function(state) {
    if (this.regexp_eatAssertion(state)) {
      // Handle `QuantifiableAssertion Quantifier` alternative.
      // `state.lastAssertionIsQuantifiable` is true if the last eaten Assertion
      // is a QuantifiableAssertion.
      if (state.lastAssertionIsQuantifiable && this.regexp_eatQuantifier(state)) {
        // Make the same message as V8.
        if (state.switchU) {
          state.raise("Invalid quantifier");
        }
      }
      return true
    }

    if (state.switchU ? this.regexp_eatAtom(state) : this.regexp_eatExtendedAtom(state)) {
      this.regexp_eatQuantifier(state);
      return true
    }

    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-Assertion
  pp$8.regexp_eatAssertion = function(state) {
    var start = state.pos;
    state.lastAssertionIsQuantifiable = false;

    // ^, $
    if (state.eat(0x5E /* ^ */) || state.eat(0x24 /* $ */)) {
      return true
    }

    // \b \B
    if (state.eat(0x5C /* \ */)) {
      if (state.eat(0x42 /* B */) || state.eat(0x62 /* b */)) {
        return true
      }
      state.pos = start;
    }

    // Lookahead / Lookbehind
    if (state.eat(0x28 /* ( */) && state.eat(0x3F /* ? */)) {
      var lookbehind = false;
      if (this.options.ecmaVersion >= 9) {
        lookbehind = state.eat(0x3C /* < */);
      }
      if (state.eat(0x3D /* = */) || state.eat(0x21 /* ! */)) {
        this.regexp_disjunction(state);
        if (!state.eat(0x29 /* ) */)) {
          state.raise("Unterminated group");
        }
        state.lastAssertionIsQuantifiable = !lookbehind;
        return true
      }
    }

    state.pos = start;
    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-Quantifier
  pp$8.regexp_eatQuantifier = function(state, noError) {
    if ( noError === void 0 ) noError = false;

    if (this.regexp_eatQuantifierPrefix(state, noError)) {
      state.eat(0x3F /* ? */);
      return true
    }
    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-QuantifierPrefix
  pp$8.regexp_eatQuantifierPrefix = function(state, noError) {
    return (
      state.eat(0x2A /* * */) ||
      state.eat(0x2B /* + */) ||
      state.eat(0x3F /* ? */) ||
      this.regexp_eatBracedQuantifier(state, noError)
    )
  };
  pp$8.regexp_eatBracedQuantifier = function(state, noError) {
    var start = state.pos;
    if (state.eat(0x7B /* { */)) {
      var min = 0, max = -1;
      if (this.regexp_eatDecimalDigits(state)) {
        min = state.lastIntValue;
        if (state.eat(0x2C /* , */) && this.regexp_eatDecimalDigits(state)) {
          max = state.lastIntValue;
        }
        if (state.eat(0x7D /* } */)) {
          // SyntaxError in https://www.ecma-international.org/ecma-262/8.0/#sec-term
          if (max !== -1 && max < min && !noError) {
            state.raise("numbers out of order in {} quantifier");
          }
          return true
        }
      }
      if (state.switchU && !noError) {
        state.raise("Incomplete quantifier");
      }
      state.pos = start;
    }
    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-Atom
  pp$8.regexp_eatAtom = function(state) {
    return (
      this.regexp_eatPatternCharacters(state) ||
      state.eat(0x2E /* . */) ||
      this.regexp_eatReverseSolidusAtomEscape(state) ||
      this.regexp_eatCharacterClass(state) ||
      this.regexp_eatUncapturingGroup(state) ||
      this.regexp_eatCapturingGroup(state)
    )
  };
  pp$8.regexp_eatReverseSolidusAtomEscape = function(state) {
    var start = state.pos;
    if (state.eat(0x5C /* \ */)) {
      if (this.regexp_eatAtomEscape(state)) {
        return true
      }
      state.pos = start;
    }
    return false
  };
  pp$8.regexp_eatUncapturingGroup = function(state) {
    var start = state.pos;
    if (state.eat(0x28 /* ( */)) {
      if (state.eat(0x3F /* ? */) && state.eat(0x3A /* : */)) {
        this.regexp_disjunction(state);
        if (state.eat(0x29 /* ) */)) {
          return true
        }
        state.raise("Unterminated group");
      }
      state.pos = start;
    }
    return false
  };
  pp$8.regexp_eatCapturingGroup = function(state) {
    if (state.eat(0x28 /* ( */)) {
      if (this.options.ecmaVersion >= 9) {
        this.regexp_groupSpecifier(state);
      } else if (state.current() === 0x3F /* ? */) {
        state.raise("Invalid group");
      }
      this.regexp_disjunction(state);
      if (state.eat(0x29 /* ) */)) {
        state.numCapturingParens += 1;
        return true
      }
      state.raise("Unterminated group");
    }
    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ExtendedAtom
  pp$8.regexp_eatExtendedAtom = function(state) {
    return (
      state.eat(0x2E /* . */) ||
      this.regexp_eatReverseSolidusAtomEscape(state) ||
      this.regexp_eatCharacterClass(state) ||
      this.regexp_eatUncapturingGroup(state) ||
      this.regexp_eatCapturingGroup(state) ||
      this.regexp_eatInvalidBracedQuantifier(state) ||
      this.regexp_eatExtendedPatternCharacter(state)
    )
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-InvalidBracedQuantifier
  pp$8.regexp_eatInvalidBracedQuantifier = function(state) {
    if (this.regexp_eatBracedQuantifier(state, true)) {
      state.raise("Nothing to repeat");
    }
    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-SyntaxCharacter
  pp$8.regexp_eatSyntaxCharacter = function(state) {
    var ch = state.current();
    if (isSyntaxCharacter(ch)) {
      state.lastIntValue = ch;
      state.advance();
      return true
    }
    return false
  };
  function isSyntaxCharacter(ch) {
    return (
      ch === 0x24 /* $ */ ||
      ch >= 0x28 /* ( */ && ch <= 0x2B /* + */ ||
      ch === 0x2E /* . */ ||
      ch === 0x3F /* ? */ ||
      ch >= 0x5B /* [ */ && ch <= 0x5E /* ^ */ ||
      ch >= 0x7B /* { */ && ch <= 0x7D /* } */
    )
  }

  // https://www.ecma-international.org/ecma-262/8.0/#prod-PatternCharacter
  // But eat eager.
  pp$8.regexp_eatPatternCharacters = function(state) {
    var start = state.pos;
    var ch = 0;
    while ((ch = state.current()) !== -1 && !isSyntaxCharacter(ch)) {
      state.advance();
    }
    return state.pos !== start
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ExtendedPatternCharacter
  pp$8.regexp_eatExtendedPatternCharacter = function(state) {
    var ch = state.current();
    if (
      ch !== -1 &&
      ch !== 0x24 /* $ */ &&
      !(ch >= 0x28 /* ( */ && ch <= 0x2B /* + */) &&
      ch !== 0x2E /* . */ &&
      ch !== 0x3F /* ? */ &&
      ch !== 0x5B /* [ */ &&
      ch !== 0x5E /* ^ */ &&
      ch !== 0x7C /* | */
    ) {
      state.advance();
      return true
    }
    return false
  };

  // GroupSpecifier[U] ::
  //   [empty]
  //   `?` GroupName[?U]
  pp$8.regexp_groupSpecifier = function(state) {
    if (state.eat(0x3F /* ? */)) {
      if (this.regexp_eatGroupName(state)) {
        if (state.groupNames.indexOf(state.lastStringValue) !== -1) {
          state.raise("Duplicate capture group name");
        }
        state.groupNames.push(state.lastStringValue);
        return
      }
      state.raise("Invalid group");
    }
  };

  // GroupName[U] ::
  //   `<` RegExpIdentifierName[?U] `>`
  // Note: this updates `state.lastStringValue` property with the eaten name.
  pp$8.regexp_eatGroupName = function(state) {
    state.lastStringValue = "";
    if (state.eat(0x3C /* < */)) {
      if (this.regexp_eatRegExpIdentifierName(state) && state.eat(0x3E /* > */)) {
        return true
      }
      state.raise("Invalid capture group name");
    }
    return false
  };

  // RegExpIdentifierName[U] ::
  //   RegExpIdentifierStart[?U]
  //   RegExpIdentifierName[?U] RegExpIdentifierPart[?U]
  // Note: this updates `state.lastStringValue` property with the eaten name.
  pp$8.regexp_eatRegExpIdentifierName = function(state) {
    state.lastStringValue = "";
    if (this.regexp_eatRegExpIdentifierStart(state)) {
      state.lastStringValue += codePointToString(state.lastIntValue);
      while (this.regexp_eatRegExpIdentifierPart(state)) {
        state.lastStringValue += codePointToString(state.lastIntValue);
      }
      return true
    }
    return false
  };

  // RegExpIdentifierStart[U] ::
  //   UnicodeIDStart
  //   `$`
  //   `_`
  //   `\` RegExpUnicodeEscapeSequence[?U]
  pp$8.regexp_eatRegExpIdentifierStart = function(state) {
    var start = state.pos;
    var ch = state.current();
    state.advance();

    if (ch === 0x5C /* \ */ && this.regexp_eatRegExpUnicodeEscapeSequence(state)) {
      ch = state.lastIntValue;
    }
    if (isRegExpIdentifierStart(ch)) {
      state.lastIntValue = ch;
      return true
    }

    state.pos = start;
    return false
  };
  function isRegExpIdentifierStart(ch) {
    return isIdentifierStart(ch, true) || ch === 0x24 /* $ */ || ch === 0x5F /* _ */
  }

  // RegExpIdentifierPart[U] ::
  //   UnicodeIDContinue
  //   `$`
  //   `_`
  //   `\` RegExpUnicodeEscapeSequence[?U]
  //   <ZWNJ>
  //   <ZWJ>
  pp$8.regexp_eatRegExpIdentifierPart = function(state) {
    var start = state.pos;
    var ch = state.current();
    state.advance();

    if (ch === 0x5C /* \ */ && this.regexp_eatRegExpUnicodeEscapeSequence(state)) {
      ch = state.lastIntValue;
    }
    if (isRegExpIdentifierPart(ch)) {
      state.lastIntValue = ch;
      return true
    }

    state.pos = start;
    return false
  };
  function isRegExpIdentifierPart(ch) {
    return isIdentifierChar(ch, true) || ch === 0x24 /* $ */ || ch === 0x5F /* _ */ || ch === 0x200C /* <ZWNJ> */ || ch === 0x200D /* <ZWJ> */
  }

  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-AtomEscape
  pp$8.regexp_eatAtomEscape = function(state) {
    if (
      this.regexp_eatBackReference(state) ||
      this.regexp_eatCharacterClassEscape(state) ||
      this.regexp_eatCharacterEscape(state) ||
      (state.switchN && this.regexp_eatKGroupName(state))
    ) {
      return true
    }
    if (state.switchU) {
      // Make the same message as V8.
      if (state.current() === 0x63 /* c */) {
        state.raise("Invalid unicode escape");
      }
      state.raise("Invalid escape");
    }
    return false
  };
  pp$8.regexp_eatBackReference = function(state) {
    var start = state.pos;
    if (this.regexp_eatDecimalEscape(state)) {
      var n = state.lastIntValue;
      if (state.switchU) {
        // For SyntaxError in https://www.ecma-international.org/ecma-262/8.0/#sec-atomescape
        if (n > state.maxBackReference) {
          state.maxBackReference = n;
        }
        return true
      }
      if (n <= state.numCapturingParens) {
        return true
      }
      state.pos = start;
    }
    return false
  };
  pp$8.regexp_eatKGroupName = function(state) {
    if (state.eat(0x6B /* k */)) {
      if (this.regexp_eatGroupName(state)) {
        state.backReferenceNames.push(state.lastStringValue);
        return true
      }
      state.raise("Invalid named reference");
    }
    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-CharacterEscape
  pp$8.regexp_eatCharacterEscape = function(state) {
    return (
      this.regexp_eatControlEscape(state) ||
      this.regexp_eatCControlLetter(state) ||
      this.regexp_eatZero(state) ||
      this.regexp_eatHexEscapeSequence(state) ||
      this.regexp_eatRegExpUnicodeEscapeSequence(state) ||
      (!state.switchU && this.regexp_eatLegacyOctalEscapeSequence(state)) ||
      this.regexp_eatIdentityEscape(state)
    )
  };
  pp$8.regexp_eatCControlLetter = function(state) {
    var start = state.pos;
    if (state.eat(0x63 /* c */)) {
      if (this.regexp_eatControlLetter(state)) {
        return true
      }
      state.pos = start;
    }
    return false
  };
  pp$8.regexp_eatZero = function(state) {
    if (state.current() === 0x30 /* 0 */ && !isDecimalDigit(state.lookahead())) {
      state.lastIntValue = 0;
      state.advance();
      return true
    }
    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-ControlEscape
  pp$8.regexp_eatControlEscape = function(state) {
    var ch = state.current();
    if (ch === 0x74 /* t */) {
      state.lastIntValue = 0x09; /* \t */
      state.advance();
      return true
    }
    if (ch === 0x6E /* n */) {
      state.lastIntValue = 0x0A; /* \n */
      state.advance();
      return true
    }
    if (ch === 0x76 /* v */) {
      state.lastIntValue = 0x0B; /* \v */
      state.advance();
      return true
    }
    if (ch === 0x66 /* f */) {
      state.lastIntValue = 0x0C; /* \f */
      state.advance();
      return true
    }
    if (ch === 0x72 /* r */) {
      state.lastIntValue = 0x0D; /* \r */
      state.advance();
      return true
    }
    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-ControlLetter
  pp$8.regexp_eatControlLetter = function(state) {
    var ch = state.current();
    if (isControlLetter(ch)) {
      state.lastIntValue = ch % 0x20;
      state.advance();
      return true
    }
    return false
  };
  function isControlLetter(ch) {
    return (
      (ch >= 0x41 /* A */ && ch <= 0x5A /* Z */) ||
      (ch >= 0x61 /* a */ && ch <= 0x7A /* z */)
    )
  }

  // https://www.ecma-international.org/ecma-262/8.0/#prod-RegExpUnicodeEscapeSequence
  pp$8.regexp_eatRegExpUnicodeEscapeSequence = function(state) {
    var start = state.pos;

    if (state.eat(0x75 /* u */)) {
      if (this.regexp_eatFixedHexDigits(state, 4)) {
        var lead = state.lastIntValue;
        if (state.switchU && lead >= 0xD800 && lead <= 0xDBFF) {
          var leadSurrogateEnd = state.pos;
          if (state.eat(0x5C /* \ */) && state.eat(0x75 /* u */) && this.regexp_eatFixedHexDigits(state, 4)) {
            var trail = state.lastIntValue;
            if (trail >= 0xDC00 && trail <= 0xDFFF) {
              state.lastIntValue = (lead - 0xD800) * 0x400 + (trail - 0xDC00) + 0x10000;
              return true
            }
          }
          state.pos = leadSurrogateEnd;
          state.lastIntValue = lead;
        }
        return true
      }
      if (
        state.switchU &&
        state.eat(0x7B /* { */) &&
        this.regexp_eatHexDigits(state) &&
        state.eat(0x7D /* } */) &&
        isValidUnicode(state.lastIntValue)
      ) {
        return true
      }
      if (state.switchU) {
        state.raise("Invalid unicode escape");
      }
      state.pos = start;
    }

    return false
  };
  function isValidUnicode(ch) {
    return ch >= 0 && ch <= 0x10FFFF
  }

  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-IdentityEscape
  pp$8.regexp_eatIdentityEscape = function(state) {
    if (state.switchU) {
      if (this.regexp_eatSyntaxCharacter(state)) {
        return true
      }
      if (state.eat(0x2F /* / */)) {
        state.lastIntValue = 0x2F; /* / */
        return true
      }
      return false
    }

    var ch = state.current();
    if (ch !== 0x63 /* c */ && (!state.switchN || ch !== 0x6B /* k */)) {
      state.lastIntValue = ch;
      state.advance();
      return true
    }

    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-DecimalEscape
  pp$8.regexp_eatDecimalEscape = function(state) {
    state.lastIntValue = 0;
    var ch = state.current();
    if (ch >= 0x31 /* 1 */ && ch <= 0x39 /* 9 */) {
      do {
        state.lastIntValue = 10 * state.lastIntValue + (ch - 0x30 /* 0 */);
        state.advance();
      } while ((ch = state.current()) >= 0x30 /* 0 */ && ch <= 0x39 /* 9 */)
      return true
    }
    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-CharacterClassEscape
  pp$8.regexp_eatCharacterClassEscape = function(state) {
    var ch = state.current();

    if (isCharacterClassEscape(ch)) {
      state.lastIntValue = -1;
      state.advance();
      return true
    }

    if (
      state.switchU &&
      this.options.ecmaVersion >= 9 &&
      (ch === 0x50 /* P */ || ch === 0x70 /* p */)
    ) {
      state.lastIntValue = -1;
      state.advance();
      if (
        state.eat(0x7B /* { */) &&
        this.regexp_eatUnicodePropertyValueExpression(state) &&
        state.eat(0x7D /* } */)
      ) {
        return true
      }
      state.raise("Invalid property name");
    }

    return false
  };
  function isCharacterClassEscape(ch) {
    return (
      ch === 0x64 /* d */ ||
      ch === 0x44 /* D */ ||
      ch === 0x73 /* s */ ||
      ch === 0x53 /* S */ ||
      ch === 0x77 /* w */ ||
      ch === 0x57 /* W */
    )
  }

  // UnicodePropertyValueExpression ::
  //   UnicodePropertyName `=` UnicodePropertyValue
  //   LoneUnicodePropertyNameOrValue
  pp$8.regexp_eatUnicodePropertyValueExpression = function(state) {
    var start = state.pos;

    // UnicodePropertyName `=` UnicodePropertyValue
    if (this.regexp_eatUnicodePropertyName(state) && state.eat(0x3D /* = */)) {
      var name = state.lastStringValue;
      if (this.regexp_eatUnicodePropertyValue(state)) {
        var value = state.lastStringValue;
        this.regexp_validateUnicodePropertyNameAndValue(state, name, value);
        return true
      }
    }
    state.pos = start;

    // LoneUnicodePropertyNameOrValue
    if (this.regexp_eatLoneUnicodePropertyNameOrValue(state)) {
      var nameOrValue = state.lastStringValue;
      this.regexp_validateUnicodePropertyNameOrValue(state, nameOrValue);
      return true
    }
    return false
  };
  pp$8.regexp_validateUnicodePropertyNameAndValue = function(state, name, value) {
    if (!has(state.unicodeProperties.nonBinary, name))
      { state.raise("Invalid property name"); }
    if (!state.unicodeProperties.nonBinary[name].test(value))
      { state.raise("Invalid property value"); }
  };
  pp$8.regexp_validateUnicodePropertyNameOrValue = function(state, nameOrValue) {
    if (!state.unicodeProperties.binary.test(nameOrValue))
      { state.raise("Invalid property name"); }
  };

  // UnicodePropertyName ::
  //   UnicodePropertyNameCharacters
  pp$8.regexp_eatUnicodePropertyName = function(state) {
    var ch = 0;
    state.lastStringValue = "";
    while (isUnicodePropertyNameCharacter(ch = state.current())) {
      state.lastStringValue += codePointToString(ch);
      state.advance();
    }
    return state.lastStringValue !== ""
  };
  function isUnicodePropertyNameCharacter(ch) {
    return isControlLetter(ch) || ch === 0x5F /* _ */
  }

  // UnicodePropertyValue ::
  //   UnicodePropertyValueCharacters
  pp$8.regexp_eatUnicodePropertyValue = function(state) {
    var ch = 0;
    state.lastStringValue = "";
    while (isUnicodePropertyValueCharacter(ch = state.current())) {
      state.lastStringValue += codePointToString(ch);
      state.advance();
    }
    return state.lastStringValue !== ""
  };
  function isUnicodePropertyValueCharacter(ch) {
    return isUnicodePropertyNameCharacter(ch) || isDecimalDigit(ch)
  }

  // LoneUnicodePropertyNameOrValue ::
  //   UnicodePropertyValueCharacters
  pp$8.regexp_eatLoneUnicodePropertyNameOrValue = function(state) {
    return this.regexp_eatUnicodePropertyValue(state)
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-CharacterClass
  pp$8.regexp_eatCharacterClass = function(state) {
    if (state.eat(0x5B /* [ */)) {
      state.eat(0x5E /* ^ */);
      this.regexp_classRanges(state);
      if (state.eat(0x5D /* [ */)) {
        return true
      }
      // Unreachable since it threw "unterminated regular expression" error before.
      state.raise("Unterminated character class");
    }
    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-ClassRanges
  // https://www.ecma-international.org/ecma-262/8.0/#prod-NonemptyClassRanges
  // https://www.ecma-international.org/ecma-262/8.0/#prod-NonemptyClassRangesNoDash
  pp$8.regexp_classRanges = function(state) {
    while (this.regexp_eatClassAtom(state)) {
      var left = state.lastIntValue;
      if (state.eat(0x2D /* - */) && this.regexp_eatClassAtom(state)) {
        var right = state.lastIntValue;
        if (state.switchU && (left === -1 || right === -1)) {
          state.raise("Invalid character class");
        }
        if (left !== -1 && right !== -1 && left > right) {
          state.raise("Range out of order in character class");
        }
      }
    }
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-ClassAtom
  // https://www.ecma-international.org/ecma-262/8.0/#prod-ClassAtomNoDash
  pp$8.regexp_eatClassAtom = function(state) {
    var start = state.pos;

    if (state.eat(0x5C /* \ */)) {
      if (this.regexp_eatClassEscape(state)) {
        return true
      }
      if (state.switchU) {
        // Make the same message as V8.
        var ch$1 = state.current();
        if (ch$1 === 0x63 /* c */ || isOctalDigit(ch$1)) {
          state.raise("Invalid class escape");
        }
        state.raise("Invalid escape");
      }
      state.pos = start;
    }

    var ch = state.current();
    if (ch !== 0x5D /* [ */) {
      state.lastIntValue = ch;
      state.advance();
      return true
    }

    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ClassEscape
  pp$8.regexp_eatClassEscape = function(state) {
    var start = state.pos;

    if (state.eat(0x62 /* b */)) {
      state.lastIntValue = 0x08; /* <BS> */
      return true
    }

    if (state.switchU && state.eat(0x2D /* - */)) {
      state.lastIntValue = 0x2D; /* - */
      return true
    }

    if (!state.switchU && state.eat(0x63 /* c */)) {
      if (this.regexp_eatClassControlLetter(state)) {
        return true
      }
      state.pos = start;
    }

    return (
      this.regexp_eatCharacterClassEscape(state) ||
      this.regexp_eatCharacterEscape(state)
    )
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-ClassControlLetter
  pp$8.regexp_eatClassControlLetter = function(state) {
    var ch = state.current();
    if (isDecimalDigit(ch) || ch === 0x5F /* _ */) {
      state.lastIntValue = ch % 0x20;
      state.advance();
      return true
    }
    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-HexEscapeSequence
  pp$8.regexp_eatHexEscapeSequence = function(state) {
    var start = state.pos;
    if (state.eat(0x78 /* x */)) {
      if (this.regexp_eatFixedHexDigits(state, 2)) {
        return true
      }
      if (state.switchU) {
        state.raise("Invalid escape");
      }
      state.pos = start;
    }
    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-DecimalDigits
  pp$8.regexp_eatDecimalDigits = function(state) {
    var start = state.pos;
    var ch = 0;
    state.lastIntValue = 0;
    while (isDecimalDigit(ch = state.current())) {
      state.lastIntValue = 10 * state.lastIntValue + (ch - 0x30 /* 0 */);
      state.advance();
    }
    return state.pos !== start
  };
  function isDecimalDigit(ch) {
    return ch >= 0x30 /* 0 */ && ch <= 0x39 /* 9 */
  }

  // https://www.ecma-international.org/ecma-262/8.0/#prod-HexDigits
  pp$8.regexp_eatHexDigits = function(state) {
    var start = state.pos;
    var ch = 0;
    state.lastIntValue = 0;
    while (isHexDigit(ch = state.current())) {
      state.lastIntValue = 16 * state.lastIntValue + hexToInt(ch);
      state.advance();
    }
    return state.pos !== start
  };
  function isHexDigit(ch) {
    return (
      (ch >= 0x30 /* 0 */ && ch <= 0x39 /* 9 */) ||
      (ch >= 0x41 /* A */ && ch <= 0x46 /* F */) ||
      (ch >= 0x61 /* a */ && ch <= 0x66 /* f */)
    )
  }
  function hexToInt(ch) {
    if (ch >= 0x41 /* A */ && ch <= 0x46 /* F */) {
      return 10 + (ch - 0x41 /* A */)
    }
    if (ch >= 0x61 /* a */ && ch <= 0x66 /* f */) {
      return 10 + (ch - 0x61 /* a */)
    }
    return ch - 0x30 /* 0 */
  }

  // https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-LegacyOctalEscapeSequence
  // Allows only 0-377(octal) i.e. 0-255(decimal).
  pp$8.regexp_eatLegacyOctalEscapeSequence = function(state) {
    if (this.regexp_eatOctalDigit(state)) {
      var n1 = state.lastIntValue;
      if (this.regexp_eatOctalDigit(state)) {
        var n2 = state.lastIntValue;
        if (n1 <= 3 && this.regexp_eatOctalDigit(state)) {
          state.lastIntValue = n1 * 64 + n2 * 8 + state.lastIntValue;
        } else {
          state.lastIntValue = n1 * 8 + n2;
        }
      } else {
        state.lastIntValue = n1;
      }
      return true
    }
    return false
  };

  // https://www.ecma-international.org/ecma-262/8.0/#prod-OctalDigit
  pp$8.regexp_eatOctalDigit = function(state) {
    var ch = state.current();
    if (isOctalDigit(ch)) {
      state.lastIntValue = ch - 0x30; /* 0 */
      state.advance();
      return true
    }
    state.lastIntValue = 0;
    return false
  };
  function isOctalDigit(ch) {
    return ch >= 0x30 /* 0 */ && ch <= 0x37 /* 7 */
  }

  // https://www.ecma-international.org/ecma-262/8.0/#prod-Hex4Digits
  // https://www.ecma-international.org/ecma-262/8.0/#prod-HexDigit
  // And HexDigit HexDigit in https://www.ecma-international.org/ecma-262/8.0/#prod-HexEscapeSequence
  pp$8.regexp_eatFixedHexDigits = function(state, length) {
    var start = state.pos;
    state.lastIntValue = 0;
    for (var i = 0; i < length; ++i) {
      var ch = state.current();
      if (!isHexDigit(ch)) {
        state.pos = start;
        return false
      }
      state.lastIntValue = 16 * state.lastIntValue + hexToInt(ch);
      state.advance();
    }
    return true
  };

  // Object type used to represent tokens. Note that normally, tokens
  // simply exist as properties on the parser object. This is only
  // used for the onToken callback and the external tokenizer.

  var Token = function Token(p) {
    this.type = p.type;
    this.value = p.value;
    this.start = p.start;
    this.end = p.end;
    if (p.options.locations)
      { this.loc = new SourceLocation(p, p.startLoc, p.endLoc); }
    if (p.options.ranges)
      { this.range = [p.start, p.end]; }
  };

  // ## Tokenizer

  var pp$9 = Parser.prototype;

  // Move to the next token

  pp$9.next = function() {
    if (this.options.onToken)
      { this.options.onToken(new Token(this)); }

    this.lastTokEnd = this.end;
    this.lastTokStart = this.start;
    this.lastTokEndLoc = this.endLoc;
    this.lastTokStartLoc = this.startLoc;
    this.nextToken();
  };

  pp$9.getToken = function() {
    this.next();
    return new Token(this)
  };

  // If we're in an ES6 environment, make parsers iterable
  if (typeof Symbol !== "undefined")
    { pp$9[Symbol.iterator] = function() {
      var this$1 = this;

      return {
        next: function () {
          var token = this$1.getToken();
          return {
            done: token.type === types.eof,
            value: token
          }
        }
      }
    }; }

  // Toggle strict mode. Re-reads the next number or string to please
  // pedantic tests (`"use strict"; 010;` should fail).

  pp$9.curContext = function() {
    return this.context[this.context.length - 1]
  };

  // Read a single token, updating the parser object's token-related
  // properties.

  pp$9.nextToken = function() {
    var curContext = this.curContext();
    if (!curContext || !curContext.preserveSpace) { this.skipSpace(); }

    this.start = this.pos;
    if (this.options.locations) { this.startLoc = this.curPosition(); }
    if (this.pos >= this.input.length) { return this.finishToken(types.eof) }

    if (curContext.override) { return curContext.override(this) }
    else { this.readToken(this.fullCharCodeAtPos()); }
  };

  pp$9.readToken = function(code) {
    // Identifier or keyword. '\uXXXX' sequences are allowed in
    // identifiers, so '\' also dispatches to that.
    if (isIdentifierStart(code, this.options.ecmaVersion >= 6) || code === 92 /* '\' */)
      { return this.readWord() }

    return this.getTokenFromCode(code)
  };

  pp$9.fullCharCodeAtPos = function() {
    var code = this.input.charCodeAt(this.pos);
    if (code <= 0xd7ff || code >= 0xe000) { return code }
    var next = this.input.charCodeAt(this.pos + 1);
    return (code << 10) + next - 0x35fdc00
  };

  pp$9.skipBlockComment = function() {
    var startLoc = this.options.onComment && this.curPosition();
    var start = this.pos, end = this.input.indexOf("*/", this.pos += 2);
    if (end === -1) { this.raise(this.pos - 2, "Unterminated comment"); }
    this.pos = end + 2;
    if (this.options.locations) {
      lineBreakG.lastIndex = start;
      var match;
      while ((match = lineBreakG.exec(this.input)) && match.index < this.pos) {
        ++this.curLine;
        this.lineStart = match.index + match[0].length;
      }
    }
    if (this.options.onComment)
      { this.options.onComment(true, this.input.slice(start + 2, end), start, this.pos,
                             startLoc, this.curPosition()); }
  };

  pp$9.skipLineComment = function(startSkip) {
    var start = this.pos;
    var startLoc = this.options.onComment && this.curPosition();
    var ch = this.input.charCodeAt(this.pos += startSkip);
    while (this.pos < this.input.length && !isNewLine(ch)) {
      ch = this.input.charCodeAt(++this.pos);
    }
    if (this.options.onComment)
      { this.options.onComment(false, this.input.slice(start + startSkip, this.pos), start, this.pos,
                             startLoc, this.curPosition()); }
  };

  // Called at the start of the parse and after every token. Skips
  // whitespace and comments, and.

  pp$9.skipSpace = function() {
    loop: while (this.pos < this.input.length) {
      var ch = this.input.charCodeAt(this.pos);
      switch (ch) {
      case 32: case 160: // ' '
        ++this.pos;
        break
      case 13:
        if (this.input.charCodeAt(this.pos + 1) === 10) {
          ++this.pos;
        }
      case 10: case 8232: case 8233:
        ++this.pos;
        if (this.options.locations) {
          ++this.curLine;
          this.lineStart = this.pos;
        }
        break
      case 47: // '/'
        switch (this.input.charCodeAt(this.pos + 1)) {
        case 42: // '*'
          this.skipBlockComment();
          break
        case 47:
          this.skipLineComment(2);
          break
        default:
          break loop
        }
        break
      default:
        if (ch > 8 && ch < 14 || ch >= 5760 && nonASCIIwhitespace.test(String.fromCharCode(ch))) {
          ++this.pos;
        } else {
          break loop
        }
      }
    }
  };

  // Called at the end of every token. Sets `end`, `val`, and
  // maintains `context` and `exprAllowed`, and skips the space after
  // the token, so that the next one's `start` will point at the
  // right position.

  pp$9.finishToken = function(type, val) {
    this.end = this.pos;
    if (this.options.locations) { this.endLoc = this.curPosition(); }
    var prevType = this.type;
    this.type = type;
    this.value = val;

    this.updateContext(prevType);
  };

  // ### Token reading

  // This is the function that is called to fetch the next token. It
  // is somewhat obscure, because it works in character codes rather
  // than characters, and because operator parsing has been inlined
  // into it.
  //
  // All in the name of speed.
  //
  pp$9.readToken_dot = function() {
    var next = this.input.charCodeAt(this.pos + 1);
    if (next >= 48 && next <= 57) { return this.readNumber(true) }
    var next2 = this.input.charCodeAt(this.pos + 2);
    if (this.options.ecmaVersion >= 6 && next === 46 && next2 === 46) { // 46 = dot '.'
      this.pos += 3;
      return this.finishToken(types.ellipsis)
    } else {
      ++this.pos;
      return this.finishToken(types.dot)
    }
  };

  pp$9.readToken_slash = function() { // '/'
    var next = this.input.charCodeAt(this.pos + 1);
    if (this.exprAllowed) { ++this.pos; return this.readRegexp() }
    if (next === 61) { return this.finishOp(types.assign, 2) }
    return this.finishOp(types.slash, 1)
  };

  pp$9.readToken_mult_modulo_exp = function(code) { // '%*'
    var next = this.input.charCodeAt(this.pos + 1);
    var size = 1;
    var tokentype = code === 42 ? types.star : types.modulo;

    // exponentiation operator ** and **=
    if (this.options.ecmaVersion >= 7 && code === 42 && next === 42) {
      ++size;
      tokentype = types.starstar;
      next = this.input.charCodeAt(this.pos + 2);
    }

    if (next === 61) { return this.finishOp(types.assign, size + 1) }
    return this.finishOp(tokentype, size)
  };

  pp$9.readToken_pipe_amp = function(code) { // '|&'
    var next = this.input.charCodeAt(this.pos + 1);
    if (next === code) { return this.finishOp(code === 124 ? types.logicalOR : types.logicalAND, 2) }
    if (next === 61) { return this.finishOp(types.assign, 2) }
    return this.finishOp(code === 124 ? types.bitwiseOR : types.bitwiseAND, 1)
  };

  pp$9.readToken_caret = function() { // '^'
    var next = this.input.charCodeAt(this.pos + 1);
    if (next === 61) { return this.finishOp(types.assign, 2) }
    return this.finishOp(types.bitwiseXOR, 1)
  };

  pp$9.readToken_plus_min = function(code) { // '+-'
    var next = this.input.charCodeAt(this.pos + 1);
    if (next === code) {
      if (next === 45 && !this.inModule && this.input.charCodeAt(this.pos + 2) === 62 &&
          (this.lastTokEnd === 0 || lineBreak.test(this.input.slice(this.lastTokEnd, this.pos)))) {
        // A `-->` line comment
        this.skipLineComment(3);
        this.skipSpace();
        return this.nextToken()
      }
      return this.finishOp(types.incDec, 2)
    }
    if (next === 61) { return this.finishOp(types.assign, 2) }
    return this.finishOp(types.plusMin, 1)
  };

  pp$9.readToken_lt_gt = function(code) { // '<>'
    var next = this.input.charCodeAt(this.pos + 1);
    var size = 1;
    if (next === code) {
      size = code === 62 && this.input.charCodeAt(this.pos + 2) === 62 ? 3 : 2;
      if (this.input.charCodeAt(this.pos + size) === 61) { return this.finishOp(types.assign, size + 1) }
      return this.finishOp(types.bitShift, size)
    }
    if (next === 33 && code === 60 && !this.inModule && this.input.charCodeAt(this.pos + 2) === 45 &&
        this.input.charCodeAt(this.pos + 3) === 45) {
      // `<!--`, an XML-style comment that should be interpreted as a line comment
      this.skipLineComment(4);
      this.skipSpace();
      return this.nextToken()
    }
    if (next === 61) { size = 2; }
    return this.finishOp(types.relational, size)
  };

  pp$9.readToken_eq_excl = function(code) { // '=!'
    var next = this.input.charCodeAt(this.pos + 1);
    if (next === 61) { return this.finishOp(types.equality, this.input.charCodeAt(this.pos + 2) === 61 ? 3 : 2) }
    if (code === 61 && next === 62 && this.options.ecmaVersion >= 6) { // '=>'
      this.pos += 2;
      return this.finishToken(types.arrow)
    }
    return this.finishOp(code === 61 ? types.eq : types.prefix, 1)
  };

  pp$9.getTokenFromCode = function(code) {
    switch (code) {
    // The interpretation of a dot depends on whether it is followed
    // by a digit or another two dots.
    case 46: // '.'
      return this.readToken_dot()

    // Punctuation tokens.
    case 40: ++this.pos; return this.finishToken(types.parenL)
    case 41: ++this.pos; return this.finishToken(types.parenR)
    case 59: ++this.pos; return this.finishToken(types.semi)
    case 44: ++this.pos; return this.finishToken(types.comma)
    case 91: ++this.pos; return this.finishToken(types.bracketL)
    case 93: ++this.pos; return this.finishToken(types.bracketR)
    case 123: ++this.pos; return this.finishToken(types.braceL)
    case 125: ++this.pos; return this.finishToken(types.braceR)
    case 58: ++this.pos; return this.finishToken(types.colon)
    case 63: ++this.pos; return this.finishToken(types.question)

    case 96: // '`'
      if (this.options.ecmaVersion < 6) { break }
      ++this.pos;
      return this.finishToken(types.backQuote)

    case 48: // '0'
      var next = this.input.charCodeAt(this.pos + 1);
      if (next === 120 || next === 88) { return this.readRadixNumber(16) } // '0x', '0X' - hex number
      if (this.options.ecmaVersion >= 6) {
        if (next === 111 || next === 79) { return this.readRadixNumber(8) } // '0o', '0O' - octal number
        if (next === 98 || next === 66) { return this.readRadixNumber(2) } // '0b', '0B' - binary number
      }

    // Anything else beginning with a digit is an integer, octal
    // number, or float.
    case 49: case 50: case 51: case 52: case 53: case 54: case 55: case 56: case 57: // 1-9
      return this.readNumber(false)

    // Quotes produce strings.
    case 34: case 39: // '"', "'"
      return this.readString(code)

    // Operators are parsed inline in tiny state machines. '=' (61) is
    // often referred to. `finishOp` simply skips the amount of
    // characters it is given as second argument, and returns a token
    // of the type given by its first argument.

    case 47: // '/'
      return this.readToken_slash()

    case 37: case 42: // '%*'
      return this.readToken_mult_modulo_exp(code)

    case 124: case 38: // '|&'
      return this.readToken_pipe_amp(code)

    case 94: // '^'
      return this.readToken_caret()

    case 43: case 45: // '+-'
      return this.readToken_plus_min(code)

    case 60: case 62: // '<>'
      return this.readToken_lt_gt(code)

    case 61: case 33: // '=!'
      return this.readToken_eq_excl(code)

    case 126: // '~'
      return this.finishOp(types.prefix, 1)
    }

    this.raise(this.pos, "Unexpected character '" + codePointToString$1(code) + "'");
  };

  pp$9.finishOp = function(type, size) {
    var str = this.input.slice(this.pos, this.pos + size);
    this.pos += size;
    return this.finishToken(type, str)
  };

  pp$9.readRegexp = function() {
    var escaped, inClass, start = this.pos;
    for (;;) {
      if (this.pos >= this.input.length) { this.raise(start, "Unterminated regular expression"); }
      var ch = this.input.charAt(this.pos);
      if (lineBreak.test(ch)) { this.raise(start, "Unterminated regular expression"); }
      if (!escaped) {
        if (ch === "[") { inClass = true; }
        else if (ch === "]" && inClass) { inClass = false; }
        else if (ch === "/" && !inClass) { break }
        escaped = ch === "\\";
      } else { escaped = false; }
      ++this.pos;
    }
    var pattern = this.input.slice(start, this.pos);
    ++this.pos;
    var flagsStart = this.pos;
    var flags = this.readWord1();
    if (this.containsEsc) { this.unexpected(flagsStart); }

    // Validate pattern
    var state = this.regexpState || (this.regexpState = new RegExpValidationState(this));
    state.reset(start, pattern, flags);
    this.validateRegExpFlags(state);
    this.validateRegExpPattern(state);

    // Create Literal#value property value.
    var value = null;
    try {
      value = new RegExp(pattern, flags);
    } catch (e) {
      // ESTree requires null if it failed to instantiate RegExp object.
      // https://github.com/estree/estree/blob/a27003adf4fd7bfad44de9cef372a2eacd527b1c/es5.md#regexpliteral
    }

    return this.finishToken(types.regexp, {pattern: pattern, flags: flags, value: value})
  };

  // Read an integer in the given radix. Return null if zero digits
  // were read, the integer value otherwise. When `len` is given, this
  // will return `null` unless the integer has exactly `len` digits.

  pp$9.readInt = function(radix, len) {
    var start = this.pos, total = 0;
    for (var i = 0, e = len == null ? Infinity : len; i < e; ++i) {
      var code = this.input.charCodeAt(this.pos), val = (void 0);
      if (code >= 97) { val = code - 97 + 10; } // a
      else if (code >= 65) { val = code - 65 + 10; } // A
      else if (code >= 48 && code <= 57) { val = code - 48; } // 0-9
      else { val = Infinity; }
      if (val >= radix) { break }
      ++this.pos;
      total = total * radix + val;
    }
    if (this.pos === start || len != null && this.pos - start !== len) { return null }

    return total
  };

  pp$9.readRadixNumber = function(radix) {
    var start = this.pos;
    this.pos += 2; // 0x
    var val = this.readInt(radix);
    if (val == null) { this.raise(this.start + 2, "Expected number in radix " + radix); }
    if (this.options.ecmaVersion >= 11 && this.input.charCodeAt(this.pos) === 110) {
      val = typeof BigInt !== "undefined" ? BigInt(this.input.slice(start, this.pos)) : null;
      ++this.pos;
    } else if (isIdentifierStart(this.fullCharCodeAtPos())) { this.raise(this.pos, "Identifier directly after number"); }
    return this.finishToken(types.num, val)
  };

  // Read an integer, octal integer, or floating-point number.

  pp$9.readNumber = function(startsWithDot) {
    var start = this.pos;
    if (!startsWithDot && this.readInt(10) === null) { this.raise(start, "Invalid number"); }
    var octal = this.pos - start >= 2 && this.input.charCodeAt(start) === 48;
    if (octal && this.strict) { this.raise(start, "Invalid number"); }
    if (octal && /[89]/.test(this.input.slice(start, this.pos))) { octal = false; }
    var next = this.input.charCodeAt(this.pos);
    if (!octal && !startsWithDot && this.options.ecmaVersion >= 11 && next === 110) {
      var str$1 = this.input.slice(start, this.pos);
      var val$1 = typeof BigInt !== "undefined" ? BigInt(str$1) : null;
      ++this.pos;
      if (isIdentifierStart(this.fullCharCodeAtPos())) { this.raise(this.pos, "Identifier directly after number"); }
      return this.finishToken(types.num, val$1)
    }
    if (next === 46 && !octal) { // '.'
      ++this.pos;
      this.readInt(10);
      next = this.input.charCodeAt(this.pos);
    }
    if ((next === 69 || next === 101) && !octal) { // 'eE'
      next = this.input.charCodeAt(++this.pos);
      if (next === 43 || next === 45) { ++this.pos; } // '+-'
      if (this.readInt(10) === null) { this.raise(start, "Invalid number"); }
    }
    if (isIdentifierStart(this.fullCharCodeAtPos())) { this.raise(this.pos, "Identifier directly after number"); }

    var str = this.input.slice(start, this.pos);
    var val = octal ? parseInt(str, 8) : parseFloat(str);
    return this.finishToken(types.num, val)
  };

  // Read a string value, interpreting backslash-escapes.

  pp$9.readCodePoint = function() {
    var ch = this.input.charCodeAt(this.pos), code;

    if (ch === 123) { // '{'
      if (this.options.ecmaVersion < 6) { this.unexpected(); }
      var codePos = ++this.pos;
      code = this.readHexChar(this.input.indexOf("}", this.pos) - this.pos);
      ++this.pos;
      if (code > 0x10FFFF) { this.invalidStringToken(codePos, "Code point out of bounds"); }
    } else {
      code = this.readHexChar(4);
    }
    return code
  };

  function codePointToString$1(code) {
    // UTF-16 Decoding
    if (code <= 0xFFFF) { return String.fromCharCode(code) }
    code -= 0x10000;
    return String.fromCharCode((code >> 10) + 0xD800, (code & 1023) + 0xDC00)
  }

  pp$9.readString = function(quote) {
    var out = "", chunkStart = ++this.pos;
    for (;;) {
      if (this.pos >= this.input.length) { this.raise(this.start, "Unterminated string constant"); }
      var ch = this.input.charCodeAt(this.pos);
      if (ch === quote) { break }
      if (ch === 92) { // '\'
        out += this.input.slice(chunkStart, this.pos);
        out += this.readEscapedChar(false);
        chunkStart = this.pos;
      } else {
        if (isNewLine(ch, this.options.ecmaVersion >= 10)) { this.raise(this.start, "Unterminated string constant"); }
        ++this.pos;
      }
    }
    out += this.input.slice(chunkStart, this.pos++);
    return this.finishToken(types.string, out)
  };

  // Reads template string tokens.

  var INVALID_TEMPLATE_ESCAPE_ERROR = {};

  pp$9.tryReadTemplateToken = function() {
    this.inTemplateElement = true;
    try {
      this.readTmplToken();
    } catch (err) {
      if (err === INVALID_TEMPLATE_ESCAPE_ERROR) {
        this.readInvalidTemplateToken();
      } else {
        throw err
      }
    }

    this.inTemplateElement = false;
  };

  pp$9.invalidStringToken = function(position, message) {
    if (this.inTemplateElement && this.options.ecmaVersion >= 9) {
      throw INVALID_TEMPLATE_ESCAPE_ERROR
    } else {
      this.raise(position, message);
    }
  };

  pp$9.readTmplToken = function() {
    var out = "", chunkStart = this.pos;
    for (;;) {
      if (this.pos >= this.input.length) { this.raise(this.start, "Unterminated template"); }
      var ch = this.input.charCodeAt(this.pos);
      if (ch === 96 || ch === 36 && this.input.charCodeAt(this.pos + 1) === 123) { // '`', '${'
        if (this.pos === this.start && (this.type === types.template || this.type === types.invalidTemplate)) {
          if (ch === 36) {
            this.pos += 2;
            return this.finishToken(types.dollarBraceL)
          } else {
            ++this.pos;
            return this.finishToken(types.backQuote)
          }
        }
        out += this.input.slice(chunkStart, this.pos);
        return this.finishToken(types.template, out)
      }
      if (ch === 92) { // '\'
        out += this.input.slice(chunkStart, this.pos);
        out += this.readEscapedChar(true);
        chunkStart = this.pos;
      } else if (isNewLine(ch)) {
        out += this.input.slice(chunkStart, this.pos);
        ++this.pos;
        switch (ch) {
        case 13:
          if (this.input.charCodeAt(this.pos) === 10) { ++this.pos; }
        case 10:
          out += "\n";
          break
        default:
          out += String.fromCharCode(ch);
          break
        }
        if (this.options.locations) {
          ++this.curLine;
          this.lineStart = this.pos;
        }
        chunkStart = this.pos;
      } else {
        ++this.pos;
      }
    }
  };

  // Reads a template token to search for the end, without validating any escape sequences
  pp$9.readInvalidTemplateToken = function() {
    for (; this.pos < this.input.length; this.pos++) {
      switch (this.input[this.pos]) {
      case "\\":
        ++this.pos;
        break

      case "$":
        if (this.input[this.pos + 1] !== "{") {
          break
        }
      // falls through

      case "`":
        return this.finishToken(types.invalidTemplate, this.input.slice(this.start, this.pos))

      // no default
      }
    }
    this.raise(this.start, "Unterminated template");
  };

  // Used to read escaped characters

  pp$9.readEscapedChar = function(inTemplate) {
    var ch = this.input.charCodeAt(++this.pos);
    ++this.pos;
    switch (ch) {
    case 110: return "\n" // 'n' -> '\n'
    case 114: return "\r" // 'r' -> '\r'
    case 120: return String.fromCharCode(this.readHexChar(2)) // 'x'
    case 117: return codePointToString$1(this.readCodePoint()) // 'u'
    case 116: return "\t" // 't' -> '\t'
    case 98: return "\b" // 'b' -> '\b'
    case 118: return "\u000b" // 'v' -> '\u000b'
    case 102: return "\f" // 'f' -> '\f'
    case 13: if (this.input.charCodeAt(this.pos) === 10) { ++this.pos; } // '\r\n'
    case 10: // ' \n'
      if (this.options.locations) { this.lineStart = this.pos; ++this.curLine; }
      return ""
    default:
      if (ch >= 48 && ch <= 55) {
        var octalStr = this.input.substr(this.pos - 1, 3).match(/^[0-7]+/)[0];
        var octal = parseInt(octalStr, 8);
        if (octal > 255) {
          octalStr = octalStr.slice(0, -1);
          octal = parseInt(octalStr, 8);
        }
        this.pos += octalStr.length - 1;
        ch = this.input.charCodeAt(this.pos);
        if ((octalStr !== "0" || ch === 56 || ch === 57) && (this.strict || inTemplate)) {
          this.invalidStringToken(
            this.pos - 1 - octalStr.length,
            inTemplate
              ? "Octal literal in template string"
              : "Octal literal in strict mode"
          );
        }
        return String.fromCharCode(octal)
      }
      if (isNewLine(ch)) {
        // Unicode new line characters after \ get removed from output in both
        // template literals and strings
        return ""
      }
      return String.fromCharCode(ch)
    }
  };

  // Used to read character escape sequences ('\x', '\u', '\U').

  pp$9.readHexChar = function(len) {
    var codePos = this.pos;
    var n = this.readInt(16, len);
    if (n === null) { this.invalidStringToken(codePos, "Bad character escape sequence"); }
    return n
  };

  // Read an identifier, and return it as a string. Sets `this.containsEsc`
  // to whether the word contained a '\u' escape.
  //
  // Incrementally adds only escaped chars, adding other chunks as-is
  // as a micro-optimization.

  pp$9.readWord1 = function() {
    this.containsEsc = false;
    var word = "", first = true, chunkStart = this.pos;
    var astral = this.options.ecmaVersion >= 6;
    while (this.pos < this.input.length) {
      var ch = this.fullCharCodeAtPos();
      if (isIdentifierChar(ch, astral)) {
        this.pos += ch <= 0xffff ? 1 : 2;
      } else if (ch === 92) { // "\"
        this.containsEsc = true;
        word += this.input.slice(chunkStart, this.pos);
        var escStart = this.pos;
        if (this.input.charCodeAt(++this.pos) !== 117) // "u"
          { this.invalidStringToken(this.pos, "Expecting Unicode escape sequence \\uXXXX"); }
        ++this.pos;
        var esc = this.readCodePoint();
        if (!(first ? isIdentifierStart : isIdentifierChar)(esc, astral))
          { this.invalidStringToken(escStart, "Invalid Unicode escape"); }
        word += codePointToString$1(esc);
        chunkStart = this.pos;
      } else {
        break
      }
      first = false;
    }
    return word + this.input.slice(chunkStart, this.pos)
  };

  // Read an identifier or keyword token. Will check for reserved
  // words when necessary.

  pp$9.readWord = function() {
    var word = this.readWord1();
    var type = types.name;
    if (this.keywords.test(word)) {
      if (this.containsEsc) { this.raiseRecoverable(this.start, "Escape sequence in keyword " + word); }
      type = keywords$1[word];
    }
    return this.finishToken(type, word)
  };

  // Acorn is a tiny, fast JavaScript parser written in JavaScript.

  var version = "6.4.0";

  Parser.acorn = {
    Parser: Parser,
    version: version,
    defaultOptions: defaultOptions,
    Position: Position,
    SourceLocation: SourceLocation,
    getLineInfo: getLineInfo,
    Node: Node,
    TokenType: TokenType,
    tokTypes: types,
    keywordTypes: keywords$1,
    TokContext: TokContext,
    tokContexts: types$1,
    isIdentifierChar: isIdentifierChar,
    isIdentifierStart: isIdentifierStart,
    Token: Token,
    isNewLine: isNewLine,
    lineBreak: lineBreak,
    lineBreakG: lineBreakG,
    nonASCIIwhitespace: nonASCIIwhitespace
  };

  // The main exported interface (under `self.acorn` when in the
  // browser) is a `parse` function that takes a code string and
  // returns an abstract syntax tree as specified by [Mozilla parser
  // API][api].
  //
  // [api]: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API

  function parse(input, options) {
    return Parser.parse(input, options)
  }

  // This function tries to parse a single expression at a given
  // offset in a string. Useful for parsing mixed-language formats
  // that embed JavaScript expressions.

  function parseExpressionAt(input, pos, options) {
    return Parser.parseExpressionAt(input, pos, options)
  }

  // Acorn is organized as a tokenizer and a recursive-descent parser.
  // The `tokenizer` export provides an interface to the tokenizer.

  function tokenizer(input, options) {
    return Parser.tokenizer(input, options)
  }

  exports.Node = Node;
  exports.Parser = Parser;
  exports.Position = Position;
  exports.SourceLocation = SourceLocation;
  exports.TokContext = TokContext;
  exports.Token = Token;
  exports.TokenType = TokenType;
  exports.defaultOptions = defaultOptions;
  exports.getLineInfo = getLineInfo;
  exports.isIdentifierChar = isIdentifierChar;
  exports.isIdentifierStart = isIdentifierStart;
  exports.isNewLine = isNewLine;
  exports.keywordTypes = keywords$1;
  exports.lineBreak = lineBreak;
  exports.lineBreakG = lineBreakG;
  exports.nonASCIIwhitespace = nonASCIIwhitespace;
  exports.parse = parse;
  exports.parseExpressionAt = parseExpressionAt;
  exports.tokContexts = types$1;
  exports.tokTypes = types;
  exports.tokenizer = tokenizer;
  exports.version = version;

  Object.defineProperty(exports, '__esModule', { value: true });
}));
// hack-istanbul - inline-require
}());


/*
repo https://github.com/estools/estraverse/tree/4.2.0
committed 2016-03-10T21:51:59Z
*/


/*
file https://github.com/estools/estraverse/blob/4.2.0/estraverse.js
*/
// hack-istanbul - inline-require
/* istanbul ignore next */
(function () { let exports; exports = estraverse;
/*
  Copyright (C) 2012-2013 Yusuke Suzuki <utatane.tea@gmail.com>
  Copyright (C) 2012 Ariya Hidayat <ariya.hidayat@gmail.com>

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*jslint vars:false, bitwise:true*/
/*jshint indent:4*/
/*global exports:true*/
(function clone(exports) {
    'use strict';

    var Syntax,
        isArray,
        VisitorOption,
        VisitorKeys,
        objectCreate,
        objectKeys,
        BREAK,
        SKIP,
        REMOVE;

    function ignoreJSHintError() { }

    isArray = Array.isArray;
    if (!isArray) {
        isArray = function isArray(array) {
            return Object.prototype.toString.call(array) === '[object Array]';
        };
    }

    function deepCopy(obj) {
        var ret = {}, key, val;
        for (key in obj) {
            if (obj.hasOwnProperty(key)) {
                val = obj[key];
                if (typeof val === 'object' && val !== null) {
                    ret[key] = deepCopy(val);
                } else {
                    ret[key] = val;
                }
            }
        }
        return ret;
    }

    function shallowCopy(obj) {
        var ret = {}, key;
        for (key in obj) {
            if (obj.hasOwnProperty(key)) {
                ret[key] = obj[key];
            }
        }
        return ret;
    }
    ignoreJSHintError(shallowCopy);

    // based on LLVM libc++ upper_bound / lower_bound
    // MIT License

    function upperBound(array, func) {
        var diff, len, i, current;

        len = array.length;
        i = 0;

        while (len) {
            diff = len >>> 1;
            current = i + diff;
            if (func(array[current])) {
                len = diff;
            } else {
                i = current + 1;
                len -= diff + 1;
            }
        }
        return i;
    }

    function lowerBound(array, func) {
        var diff, len, i, current;

        len = array.length;
        i = 0;

        while (len) {
            diff = len >>> 1;
            current = i + diff;
            if (func(array[current])) {
                i = current + 1;
                len -= diff + 1;
            } else {
                len = diff;
            }
        }
        return i;
    }
    ignoreJSHintError(lowerBound);

    objectCreate = Object.create || (function () {
        function F() { }

        return function (o) {
            F.prototype = o;
            return new F();
        };
    })();

    objectKeys = Object.keys || function (o) {
        var keys = [], key;
        for (key in o) {
            keys.push(key);
        }
        return keys;
    };

    function extend(to, from) {
        var keys = objectKeys(from), key, i, len;
        for (i = 0, len = keys.length; i < len; i += 1) {
            key = keys[i];
            to[key] = from[key];
        }
        return to;
    }

    Syntax = {
        AssignmentExpression: 'AssignmentExpression',
        AssignmentPattern: 'AssignmentPattern',
        ArrayExpression: 'ArrayExpression',
        ArrayPattern: 'ArrayPattern',
        ArrowFunctionExpression: 'ArrowFunctionExpression',
        AwaitExpression: 'AwaitExpression', // CAUTION: It's deferred to ES7.
        BlockStatement: 'BlockStatement',
        BinaryExpression: 'BinaryExpression',
        BreakStatement: 'BreakStatement',
        CallExpression: 'CallExpression',
        CatchClause: 'CatchClause',
        ClassBody: 'ClassBody',
        ClassDeclaration: 'ClassDeclaration',
        ClassExpression: 'ClassExpression',
        ComprehensionBlock: 'ComprehensionBlock',  // CAUTION: It's deferred to ES7.
        ComprehensionExpression: 'ComprehensionExpression',  // CAUTION: It's deferred to ES7.
        ConditionalExpression: 'ConditionalExpression',
        ContinueStatement: 'ContinueStatement',
        DebuggerStatement: 'DebuggerStatement',
        DirectiveStatement: 'DirectiveStatement',
        DoWhileStatement: 'DoWhileStatement',
        EmptyStatement: 'EmptyStatement',
        ExportAllDeclaration: 'ExportAllDeclaration',
        ExportDefaultDeclaration: 'ExportDefaultDeclaration',
        ExportNamedDeclaration: 'ExportNamedDeclaration',
        ExportSpecifier: 'ExportSpecifier',
        ExpressionStatement: 'ExpressionStatement',
        ForStatement: 'ForStatement',
        ForInStatement: 'ForInStatement',
        ForOfStatement: 'ForOfStatement',
        FunctionDeclaration: 'FunctionDeclaration',
        FunctionExpression: 'FunctionExpression',
        GeneratorExpression: 'GeneratorExpression',  // CAUTION: It's deferred to ES7.
        Identifier: 'Identifier',
        IfStatement: 'IfStatement',
        ImportDeclaration: 'ImportDeclaration',
        ImportDefaultSpecifier: 'ImportDefaultSpecifier',
        ImportNamespaceSpecifier: 'ImportNamespaceSpecifier',
        ImportSpecifier: 'ImportSpecifier',
        Literal: 'Literal',
        LabeledStatement: 'LabeledStatement',
        LogicalExpression: 'LogicalExpression',
        MemberExpression: 'MemberExpression',
        MetaProperty: 'MetaProperty',
        MethodDefinition: 'MethodDefinition',
        ModuleSpecifier: 'ModuleSpecifier',
        NewExpression: 'NewExpression',
        ObjectExpression: 'ObjectExpression',
        ObjectPattern: 'ObjectPattern',
        Program: 'Program',
        Property: 'Property',
        RestElement: 'RestElement',
        ReturnStatement: 'ReturnStatement',
        SequenceExpression: 'SequenceExpression',
        SpreadElement: 'SpreadElement',
        Super: 'Super',
        SwitchStatement: 'SwitchStatement',
        SwitchCase: 'SwitchCase',
        TaggedTemplateExpression: 'TaggedTemplateExpression',
        TemplateElement: 'TemplateElement',
        TemplateLiteral: 'TemplateLiteral',
        ThisExpression: 'ThisExpression',
        ThrowStatement: 'ThrowStatement',
        TryStatement: 'TryStatement',
        UnaryExpression: 'UnaryExpression',
        UpdateExpression: 'UpdateExpression',
        VariableDeclaration: 'VariableDeclaration',
        VariableDeclarator: 'VariableDeclarator',
        WhileStatement: 'WhileStatement',
        WithStatement: 'WithStatement',
        YieldExpression: 'YieldExpression'
    };

    VisitorKeys = {
        AssignmentExpression: ['left', 'right'],
        AssignmentPattern: ['left', 'right'],
        ArrayExpression: ['elements'],
        ArrayPattern: ['elements'],
        ArrowFunctionExpression: ['params', 'body'],
        AwaitExpression: ['argument'], // CAUTION: It's deferred to ES7.
        BlockStatement: ['body'],
        BinaryExpression: ['left', 'right'],
        BreakStatement: ['label'],
        CallExpression: ['callee', 'arguments'],
        CatchClause: ['param', 'body'],
        ClassBody: ['body'],
        ClassDeclaration: ['id', 'superClass', 'body'],
        ClassExpression: ['id', 'superClass', 'body'],
        ComprehensionBlock: ['left', 'right'],  // CAUTION: It's deferred to ES7.
        ComprehensionExpression: ['blocks', 'filter', 'body'],  // CAUTION: It's deferred to ES7.
        ConditionalExpression: ['test', 'consequent', 'alternate'],
        ContinueStatement: ['label'],
        DebuggerStatement: [],
        DirectiveStatement: [],
        DoWhileStatement: ['body', 'test'],
        EmptyStatement: [],
        ExportAllDeclaration: ['source'],
        ExportDefaultDeclaration: ['declaration'],
        ExportNamedDeclaration: ['declaration', 'specifiers', 'source'],
        ExportSpecifier: ['exported', 'local'],
        ExpressionStatement: ['expression'],
        ForStatement: ['init', 'test', 'update', 'body'],
        ForInStatement: ['left', 'right', 'body'],
        ForOfStatement: ['left', 'right', 'body'],
        FunctionDeclaration: ['id', 'params', 'body'],
        FunctionExpression: ['id', 'params', 'body'],
        GeneratorExpression: ['blocks', 'filter', 'body'],  // CAUTION: It's deferred to ES7.
        Identifier: [],
        IfStatement: ['test', 'consequent', 'alternate'],
        ImportDeclaration: ['specifiers', 'source'],
        ImportDefaultSpecifier: ['local'],
        ImportNamespaceSpecifier: ['local'],
        ImportSpecifier: ['imported', 'local'],
        Literal: [],
        LabeledStatement: ['label', 'body'],
        LogicalExpression: ['left', 'right'],
        MemberExpression: ['object', 'property'],
        MetaProperty: ['meta', 'property'],
        MethodDefinition: ['key', 'value'],
        ModuleSpecifier: [],
        NewExpression: ['callee', 'arguments'],
        ObjectExpression: ['properties'],
        ObjectPattern: ['properties'],
        Program: ['body'],
        Property: ['key', 'value'],
        RestElement: [ 'argument' ],
        ReturnStatement: ['argument'],
        SequenceExpression: ['expressions'],
        SpreadElement: ['argument'],
        Super: [],
        SwitchStatement: ['discriminant', 'cases'],
        SwitchCase: ['test', 'consequent'],
        TaggedTemplateExpression: ['tag', 'quasi'],
        TemplateElement: [],
        TemplateLiteral: ['quasis', 'expressions'],
        ThisExpression: [],
        ThrowStatement: ['argument'],
        TryStatement: ['block', 'handler', 'finalizer'],
        UnaryExpression: ['argument'],
        UpdateExpression: ['argument'],
        VariableDeclaration: ['declarations'],
        VariableDeclarator: ['id', 'init'],
        WhileStatement: ['test', 'body'],
        WithStatement: ['object', 'body'],
        YieldExpression: ['argument']
    };

    // unique id
    BREAK = {};
    SKIP = {};
    REMOVE = {};

    VisitorOption = {
        Break: BREAK,
        Skip: SKIP,
        Remove: REMOVE
    };

    function Reference(parent, key) {
        this.parent = parent;
        this.key = key;
    }

    Reference.prototype.replace = function replace(node) {
        this.parent[this.key] = node;
    };

    Reference.prototype.remove = function remove() {
        if (isArray(this.parent)) {
            this.parent.splice(this.key, 1);
            return true;
        } else {
            this.replace(null);
            return false;
        }
    };

    function Element(node, path, wrap, ref) {
        this.node = node;
        this.path = path;
        this.wrap = wrap;
        this.ref = ref;
    }

    function Controller() { }

    // API:
    // return property path array from root to current node
    Controller.prototype.path = function path() {
        var i, iz, j, jz, result, element;

        function addToPath(result, path) {
            if (isArray(path)) {
                for (j = 0, jz = path.length; j < jz; ++j) {
                    result.push(path[j]);
                }
            } else {
                result.push(path);
            }
        }

        // root node
        if (!this.__current.path) {
            return null;
        }

        // first node is sentinel, second node is root element
        result = [];
        for (i = 2, iz = this.__leavelist.length; i < iz; ++i) {
            element = this.__leavelist[i];
            addToPath(result, element.path);
        }
        addToPath(result, this.__current.path);
        return result;
    };

    // API:
    // return type of current node
    Controller.prototype.type = function () {
        var node = this.current();
        return node.type || this.__current.wrap;
    };

    // API:
    // return array of parent elements
    Controller.prototype.parents = function parents() {
        var i, iz, result;

        // first node is sentinel
        result = [];
        for (i = 1, iz = this.__leavelist.length; i < iz; ++i) {
            result.push(this.__leavelist[i].node);
        }

        return result;
    };

    // API:
    // return current node
    Controller.prototype.current = function current() {
        return this.__current.node;
    };

    Controller.prototype.__execute = function __execute(callback, element) {
        var previous, result;

        result = undefined;

        previous  = this.__current;
        this.__current = element;
        this.__state = null;
        if (callback) {
            result = callback.call(this, element.node, this.__leavelist[this.__leavelist.length - 1].node);
        }
        this.__current = previous;

        return result;
    };

    // API:
    // notify control skip / break
    Controller.prototype.notify = function notify(flag) {
        this.__state = flag;
    };

    // API:
    // skip child nodes of current node
    Controller.prototype.skip = function () {
        this.notify(SKIP);
    };

    // API:
    // break traversals
    Controller.prototype['break'] = function () {
        this.notify(BREAK);
    };

    // API:
    // remove node
    Controller.prototype.remove = function () {
        this.notify(REMOVE);
    };

    Controller.prototype.__initialize = function(root, visitor) {
        this.visitor = visitor;
        this.root = root;
        this.__worklist = [];
        this.__leavelist = [];
        this.__current = null;
        this.__state = null;
        this.__fallback = null;
        if (visitor.fallback === 'iteration') {
            this.__fallback = objectKeys;
        } else if (typeof visitor.fallback === 'function') {
            this.__fallback = visitor.fallback;
        }

        this.__keys = VisitorKeys;
        if (visitor.keys) {
            this.__keys = extend(objectCreate(this.__keys), visitor.keys);
        }
    };

    function isNode(node) {
        if (node == null) {
            return false;
        }
        return typeof node === 'object' && typeof node.type === 'string';
    }

    function isProperty(nodeType, key) {
        return (nodeType === Syntax.ObjectExpression || nodeType === Syntax.ObjectPattern) && 'properties' === key;
    }

    Controller.prototype.traverse = function traverse(root, visitor) {
        var worklist,
            leavelist,
            element,
            node,
            nodeType,
            ret,
            key,
            current,
            current2,
            candidates,
            candidate,
            sentinel;

        this.__initialize(root, visitor);

        sentinel = {};

        // reference
        worklist = this.__worklist;
        leavelist = this.__leavelist;

        // initialize
        worklist.push(new Element(root, null, null, null));
        leavelist.push(new Element(null, null, null, null));

        while (worklist.length) {
            element = worklist.pop();

            if (element === sentinel) {
                element = leavelist.pop();

                ret = this.__execute(visitor.leave, element);

                if (this.__state === BREAK || ret === BREAK) {
                    return;
                }
                continue;
            }

            if (element.node) {

                ret = this.__execute(visitor.enter, element);

                if (this.__state === BREAK || ret === BREAK) {
                    return;
                }

                worklist.push(sentinel);
                leavelist.push(element);

                if (this.__state === SKIP || ret === SKIP) {
                    continue;
                }

                node = element.node;
                nodeType = node.type || element.wrap;
                candidates = this.__keys[nodeType];
                if (!candidates) {
                    if (this.__fallback) {
                        candidates = this.__fallback(node);
                    } else {
                        throw new Error('Unknown node type ' + nodeType + '.');
                    }
                }

                current = candidates.length;
                while ((current -= 1) >= 0) {
                    key = candidates[current];
                    candidate = node[key];
                    if (!candidate) {
                        continue;
                    }

                    if (isArray(candidate)) {
                        current2 = candidate.length;
                        while ((current2 -= 1) >= 0) {
                            if (!candidate[current2]) {
                                continue;
                            }
                            if (isProperty(nodeType, candidates[current])) {
                                element = new Element(candidate[current2], [key, current2], 'Property', null);
                            } else if (isNode(candidate[current2])) {
                                element = new Element(candidate[current2], [key, current2], null, null);
                            } else {
                                continue;
                            }
                            worklist.push(element);
                        }
                    } else if (isNode(candidate)) {
                        worklist.push(new Element(candidate, key, null, null));
                    }
                }
            }
        }
    };

    Controller.prototype.replace = function replace(root, visitor) {
        var worklist,
            leavelist,
            node,
            nodeType,
            target,
            element,
            current,
            current2,
            candidates,
            candidate,
            sentinel,
            outer,
            key;

        function removeElem(element) {
            var i,
                key,
                nextElem,
                parent;

            if (element.ref.remove()) {
                // When the reference is an element of an array.
                key = element.ref.key;
                parent = element.ref.parent;

                // If removed from array, then decrease following items' keys.
                i = worklist.length;
                while (i--) {
                    nextElem = worklist[i];
                    if (nextElem.ref && nextElem.ref.parent === parent) {
                        if  (nextElem.ref.key < key) {
                            break;
                        }
                        --nextElem.ref.key;
                    }
                }
            }
        }

        this.__initialize(root, visitor);

        sentinel = {};

        // reference
        worklist = this.__worklist;
        leavelist = this.__leavelist;

        // initialize
        outer = {
            root: root
        };
        element = new Element(root, null, null, new Reference(outer, 'root'));
        worklist.push(element);
        leavelist.push(element);

        while (worklist.length) {
            element = worklist.pop();

            if (element === sentinel) {
                element = leavelist.pop();

                target = this.__execute(visitor.leave, element);

                // node may be replaced with null,
                // so distinguish between undefined and null in this place
                if (target !== undefined && target !== BREAK && target !== SKIP && target !== REMOVE) {
                    // replace
                    element.ref.replace(target);
                }

                if (this.__state === REMOVE || target === REMOVE) {
                    removeElem(element);
                }

                if (this.__state === BREAK || target === BREAK) {
                    return outer.root;
                }
                continue;
            }

            target = this.__execute(visitor.enter, element);

            // node may be replaced with null,
            // so distinguish between undefined and null in this place
            if (target !== undefined && target !== BREAK && target !== SKIP && target !== REMOVE) {
                // replace
                element.ref.replace(target);
                element.node = target;
            }

            if (this.__state === REMOVE || target === REMOVE) {
                removeElem(element);
                element.node = null;
            }

            if (this.__state === BREAK || target === BREAK) {
                return outer.root;
            }

            // node may be null
            node = element.node;
            if (!node) {
                continue;
            }

            worklist.push(sentinel);
            leavelist.push(element);

            if (this.__state === SKIP || target === SKIP) {
                continue;
            }

            nodeType = node.type || element.wrap;
            candidates = this.__keys[nodeType];
            if (!candidates) {
                if (this.__fallback) {
                    candidates = this.__fallback(node);
                } else {
                    throw new Error('Unknown node type ' + nodeType + '.');
                }
            }

            current = candidates.length;
            while ((current -= 1) >= 0) {
                key = candidates[current];
                candidate = node[key];
                if (!candidate) {
                    continue;
                }

                if (isArray(candidate)) {
                    current2 = candidate.length;
                    while ((current2 -= 1) >= 0) {
                        if (!candidate[current2]) {
                            continue;
                        }
                        if (isProperty(nodeType, candidates[current])) {
                            element = new Element(candidate[current2], [key, current2], 'Property', new Reference(candidate, current2));
                        } else if (isNode(candidate[current2])) {
                            element = new Element(candidate[current2], [key, current2], null, new Reference(candidate, current2));
                        } else {
                            continue;
                        }
                        worklist.push(element);
                    }
                } else if (isNode(candidate)) {
                    worklist.push(new Element(candidate, key, null, new Reference(node, key)));
                }
            }
        }

        return outer.root;
    };

    function traverse(root, visitor) {
        var controller = new Controller();
        return controller.traverse(root, visitor);
    }

    function replace(root, visitor) {
        var controller = new Controller();
        return controller.replace(root, visitor);
    }

    function extendCommentRange(comment, tokens) {
        var target;

        target = upperBound(tokens, function search(token) {
            return token.range[0] > comment.range[0];
        });

        comment.extendedRange = [comment.range[0], comment.range[1]];

        if (target !== tokens.length) {
            comment.extendedRange[1] = tokens[target].range[0];
        }

        target -= 1;
        if (target >= 0) {
            comment.extendedRange[0] = tokens[target].range[1];
        }

        return comment;
    }

    function attachComments(tree, providedComments, tokens) {
        // At first, we should calculate extended comment ranges.
        var comments = [], comment, len, i, cursor;

        if (!tree.range) {
            throw new Error('attachComments needs range information');
        }

        // tokens array is empty, we attach comments to tree as 'leadingComments'
        if (!tokens.length) {
            if (providedComments.length) {
                for (i = 0, len = providedComments.length; i < len; i += 1) {
                    comment = deepCopy(providedComments[i]);
                    comment.extendedRange = [0, tree.range[0]];
                    comments.push(comment);
                }
                tree.leadingComments = comments;
            }
            return tree;
        }

        for (i = 0, len = providedComments.length; i < len; i += 1) {
            comments.push(extendCommentRange(deepCopy(providedComments[i]), tokens));
        }

        // This is based on John Freeman's implementation.
        cursor = 0;
        traverse(tree, {
            enter: function (node) {
                var comment;

                while (cursor < comments.length) {
                    comment = comments[cursor];
                    if (comment.extendedRange[1] > node.range[0]) {
                        break;
                    }

                    if (comment.extendedRange[1] === node.range[0]) {
                        if (!node.leadingComments) {
                            node.leadingComments = [];
                        }
                        node.leadingComments.push(comment);
                        comments.splice(cursor, 1);
                    } else {
                        cursor += 1;
                    }
                }

                // already out of owned node
                if (cursor === comments.length) {
                    return VisitorOption.Break;
                }

                if (comments[cursor].extendedRange[0] > node.range[1]) {
                    return VisitorOption.Skip;
                }
            }
        });

        cursor = 0;
        traverse(tree, {
            leave: function (node) {
                var comment;

                while (cursor < comments.length) {
                    comment = comments[cursor];
                    if (node.range[1] < comment.extendedRange[0]) {
                        break;
                    }

                    if (node.range[1] === comment.extendedRange[0]) {
                        if (!node.trailingComments) {
                            node.trailingComments = [];
                        }
                        node.trailingComments.push(comment);
                        comments.splice(cursor, 1);
                    } else {
                        cursor += 1;
                    }
                }

                // already out of owned node
                if (cursor === comments.length) {
                    return VisitorOption.Break;
                }

                if (comments[cursor].extendedRange[0] > node.range[1]) {
                    return VisitorOption.Skip;
                }
            }
        });

        return tree;
    }

    // hack-istanbul - inline-require
    exports.version = {};
    exports.Syntax = Syntax;
    exports.traverse = traverse;
    exports.replace = replace;
    exports.attachComments = attachComments;
    exports.VisitorKeys = VisitorKeys;
    exports.VisitorOption = VisitorOption;
    exports.Controller = Controller;
    exports.cloneEnvironment = function () { return clone({}); };

    return exports;
}(exports));
/* vim: set sw=4 ts=4 et tw=80 : */
// hack-istanbul - inline-require
}());


/*
repo https://github.com/estools/esutils/tree/2.0.3
committed 2019-07-31T01:06:44Z
*/


/*
file https://github.com/estools/esutils/blob/2.0.3/lib/code.js
*/
// hack-istanbul - inline-require
/* istanbul ignore next */
(function () { let module; module = {};
/*
  Copyright (C) 2013-2014 Yusuke Suzuki <utatane.tea@gmail.com>
  Copyright (C) 2014 Ivan Nikulin <ifaaan@gmail.com>

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

(function () {
    'use strict';

    var ES6Regex, ES5Regex, NON_ASCII_WHITESPACES, IDENTIFIER_START, IDENTIFIER_PART, ch;

    // See `tools/generate-identifier-regex.js`.
    ES5Regex = {
        // ECMAScript 5.1/Unicode v9.0.0 NonAsciiIdentifierStart:
        NonAsciiIdentifierStart: /[\xAA\xB5\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u037F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u052F\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u08A0-\u08B4\u08B6-\u08BD\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0980\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0AF9\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C39\u0C3D\u0C58-\u0C5A\u0C60\u0C61\u0C80\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CF1\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D54-\u0D56\u0D5F-\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F5\u13F8-\u13FD\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16EE-\u16F8\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1877\u1880-\u1884\u1887-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191E\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19B0-\u19C9\u1A00-\u1A16\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1C80-\u1C88\u1CE9-\u1CEC\u1CEE-\u1CF1\u1CF5\u1CF6\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2160-\u2188\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303C\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FD5\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA66E\uA67F-\uA69D\uA6A0-\uA6EF\uA717-\uA71F\uA722-\uA788\uA78B-\uA7AE\uA7B0-\uA7B7\uA7F7-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA8FD\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uA9E0-\uA9E4\uA9E6-\uA9EF\uA9FA-\uA9FE\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA7E-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uAB30-\uAB5A\uAB5C-\uAB65\uAB70-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]/,
        // ECMAScript 5.1/Unicode v9.0.0 NonAsciiIdentifierPart:
        NonAsciiIdentifierPart: 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    };

    ES6Regex = {
        // ECMAScript 6/Unicode v9.0.0 NonAsciiIdentifierStart:
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        // ECMAScript 6/Unicode v9.0.0 NonAsciiIdentifierPart:
        NonAsciiIdentifierPart: /[\xAA\xB5\xB7\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0300-\u0374\u0376\u0377\u037A-\u037D\u037F\u0386-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u0483-\u0487\u048A-\u052F\u0531-\u0556\u0559\u0561-\u0587\u0591-\u05BD\u05BF\u05C1\u05C2\u05C4\u05C5\u05C7\u05D0-\u05EA\u05F0-\u05F2\u0610-\u061A\u0620-\u0669\u066E-\u06D3\u06D5-\u06DC\u06DF-\u06E8\u06EA-\u06FC\u06FF\u0710-\u074A\u074D-\u07B1\u07C0-\u07F5\u07FA\u0800-\u082D\u0840-\u085B\u08A0-\u08B4\u08B6-\u08BD\u08D4-\u08E1\u08E3-\u0963\u0966-\u096F\u0971-\u0983\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BC-\u09C4\u09C7\u09C8\u09CB-\u09CE\u09D7\u09DC\u09DD\u09DF-\u09E3\u09E6-\u09F1\u0A01-\u0A03\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A3C\u0A3E-\u0A42\u0A47\u0A48\u0A4B-\u0A4D\u0A51\u0A59-\u0A5C\u0A5E\u0A66-\u0A75\u0A81-\u0A83\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABC-\u0AC5\u0AC7-\u0AC9\u0ACB-\u0ACD\u0AD0\u0AE0-\u0AE3\u0AE6-\u0AEF\u0AF9\u0B01-\u0B03\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3C-\u0B44\u0B47\u0B48\u0B4B-\u0B4D\u0B56\u0B57\u0B5C\u0B5D\u0B5F-\u0B63\u0B66-\u0B6F\u0B71\u0B82\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BBE-\u0BC2\u0BC6-\u0BC8\u0BCA-\u0BCD\u0BD0\u0BD7\u0BE6-\u0BEF\u0C00-\u0C03\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C39\u0C3D-\u0C44\u0C46-\u0C48\u0C4A-\u0C4D\u0C55\u0C56\u0C58-\u0C5A\u0C60-\u0C63\u0C66-\u0C6F\u0C80-\u0C83\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBC-\u0CC4\u0CC6-\u0CC8\u0CCA-\u0CCD\u0CD5\u0CD6\u0CDE\u0CE0-\u0CE3\u0CE6-\u0CEF\u0CF1\u0CF2\u0D01-\u0D03\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D-\u0D44\u0D46-\u0D48\u0D4A-\u0D4E\u0D54-\u0D57\u0D5F-\u0D63\u0D66-\u0D6F\u0D7A-\u0D7F\u0D82\u0D83\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0DCA\u0DCF-\u0DD4\u0DD6\u0DD8-\u0DDF\u0DE6-\u0DEF\u0DF2\u0DF3\u0E01-\u0E3A\u0E40-\u0E4E\u0E50-\u0E59\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB9\u0EBB-\u0EBD\u0EC0-\u0EC4\u0EC6\u0EC8-\u0ECD\u0ED0-\u0ED9\u0EDC-\u0EDF\u0F00\u0F18\u0F19\u0F20-\u0F29\u0F35\u0F37\u0F39\u0F3E-\u0F47\u0F49-\u0F6C\u0F71-\u0F84\u0F86-\u0F97\u0F99-\u0FBC\u0FC6\u1000-\u1049\u1050-\u109D\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u135D-\u135F\u1369-\u1371\u1380-\u138F\u13A0-\u13F5\u13F8-\u13FD\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16EE-\u16F8\u1700-\u170C\u170E-\u1714\u1720-\u1734\u1740-\u1753\u1760-\u176C\u176E-\u1770\u1772\u1773\u1780-\u17D3\u17D7\u17DC\u17DD\u17E0-\u17E9\u180B-\u180D\u1810-\u1819\u1820-\u1877\u1880-\u18AA\u18B0-\u18F5\u1900-\u191E\u1920-\u192B\u1930-\u193B\u1946-\u196D\u1970-\u1974\u1980-\u19AB\u19B0-\u19C9\u19D0-\u19DA\u1A00-\u1A1B\u1A20-\u1A5E\u1A60-\u1A7C\u1A7F-\u1A89\u1A90-\u1A99\u1AA7\u1AB0-\u1ABD\u1B00-\u1B4B\u1B50-\u1B59\u1B6B-\u1B73\u1B80-\u1BF3\u1C00-\u1C37\u1C40-\u1C49\u1C4D-\u1C7D\u1C80-\u1C88\u1CD0-\u1CD2\u1CD4-\u1CF6\u1CF8\u1CF9\u1D00-\u1DF5\u1DFB-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u200C\u200D\u203F\u2040\u2054\u2071\u207F\u2090-\u209C\u20D0-\u20DC\u20E1\u20E5-\u20F0\u2102\u2107\u210A-\u2113\u2115\u2118-\u211D\u2124\u2126\u2128\u212A-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2160-\u2188\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D7F-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2DE0-\u2DFF\u3005-\u3007\u3021-\u302F\u3031-\u3035\u3038-\u303C\u3041-\u3096\u3099-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FD5\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA62B\uA640-\uA66F\uA674-\uA67D\uA67F-\uA6F1\uA717-\uA71F\uA722-\uA788\uA78B-\uA7AE\uA7B0-\uA7B7\uA7F7-\uA827\uA840-\uA873\uA880-\uA8C5\uA8D0-\uA8D9\uA8E0-\uA8F7\uA8FB\uA8FD\uA900-\uA92D\uA930-\uA953\uA960-\uA97C\uA980-\uA9C0\uA9CF-\uA9D9\uA9E0-\uA9FE\uAA00-\uAA36\uAA40-\uAA4D\uAA50-\uAA59\uAA60-\uAA76\uAA7A-\uAAC2\uAADB-\uAADD\uAAE0-\uAAEF\uAAF2-\uAAF6\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uAB30-\uAB5A\uAB5C-\uAB65\uAB70-\uABEA\uABEC\uABED\uABF0-\uABF9\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE00-\uFE0F\uFE20-\uFE2F\uFE33\uFE34\uFE4D-\uFE4F\uFE70-\uFE74\uFE76-\uFEFC\uFF10-\uFF19\uFF21-\uFF3A\uFF3F\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]|\uD800[\uDC00-\uDC0B\uDC0D-\uDC26\uDC28-\uDC3A\uDC3C\uDC3D\uDC3F-\uDC4D\uDC50-\uDC5D\uDC80-\uDCFA\uDD40-\uDD74\uDDFD\uDE80-\uDE9C\uDEA0-\uDED0\uDEE0\uDF00-\uDF1F\uDF30-\uDF4A\uDF50-\uDF7A\uDF80-\uDF9D\uDFA0-\uDFC3\uDFC8-\uDFCF\uDFD1-\uDFD5]|\uD801[\uDC00-\uDC9D\uDCA0-\uDCA9\uDCB0-\uDCD3\uDCD8-\uDCFB\uDD00-\uDD27\uDD30-\uDD63\uDE00-\uDF36\uDF40-\uDF55\uDF60-\uDF67]|\uD802[\uDC00-\uDC05\uDC08\uDC0A-\uDC35\uDC37\uDC38\uDC3C\uDC3F-\uDC55\uDC60-\uDC76\uDC80-\uDC9E\uDCE0-\uDCF2\uDCF4\uDCF5\uDD00-\uDD15\uDD20-\uDD39\uDD80-\uDDB7\uDDBE\uDDBF\uDE00-\uDE03\uDE05\uDE06\uDE0C-\uDE13\uDE15-\uDE17\uDE19-\uDE33\uDE38-\uDE3A\uDE3F\uDE60-\uDE7C\uDE80-\uDE9C\uDEC0-\uDEC7\uDEC9-\uDEE6\uDF00-\uDF35\uDF40-\uDF55\uDF60-\uDF72\uDF80-\uDF91]|\uD803[\uDC00-\uDC48\uDC80-\uDCB2\uDCC0-\uDCF2]|\uD804[\uDC00-\uDC46\uDC66-\uDC6F\uDC7F-\uDCBA\uDCD0-\uDCE8\uDCF0-\uDCF9\uDD00-\uDD34\uDD36-\uDD3F\uDD50-\uDD73\uDD76\uDD80-\uDDC4\uDDCA-\uDDCC\uDDD0-\uDDDA\uDDDC\uDE00-\uDE11\uDE13-\uDE37\uDE3E\uDE80-\uDE86\uDE88\uDE8A-\uDE8D\uDE8F-\uDE9D\uDE9F-\uDEA8\uDEB0-\uDEEA\uDEF0-\uDEF9\uDF00-\uDF03\uDF05-\uDF0C\uDF0F\uDF10\uDF13-\uDF28\uDF2A-\uDF30\uDF32\uDF33\uDF35-\uDF39\uDF3C-\uDF44\uDF47\uDF48\uDF4B-\uDF4D\uDF50\uDF57\uDF5D-\uDF63\uDF66-\uDF6C\uDF70-\uDF74]|\uD805[\uDC00-\uDC4A\uDC50-\uDC59\uDC80-\uDCC5\uDCC7\uDCD0-\uDCD9\uDD80-\uDDB5\uDDB8-\uDDC0\uDDD8-\uDDDD\uDE00-\uDE40\uDE44\uDE50-\uDE59\uDE80-\uDEB7\uDEC0-\uDEC9\uDF00-\uDF19\uDF1D-\uDF2B\uDF30-\uDF39]|\uD806[\uDCA0-\uDCE9\uDCFF\uDEC0-\uDEF8]|\uD807[\uDC00-\uDC08\uDC0A-\uDC36\uDC38-\uDC40\uDC50-\uDC59\uDC72-\uDC8F\uDC92-\uDCA7\uDCA9-\uDCB6]|\uD808[\uDC00-\uDF99]|\uD809[\uDC00-\uDC6E\uDC80-\uDD43]|[\uD80C\uD81C-\uD820\uD840-\uD868\uD86A-\uD86C\uD86F-\uD872][\uDC00-\uDFFF]|\uD80D[\uDC00-\uDC2E]|\uD811[\uDC00-\uDE46]|\uD81A[\uDC00-\uDE38\uDE40-\uDE5E\uDE60-\uDE69\uDED0-\uDEED\uDEF0-\uDEF4\uDF00-\uDF36\uDF40-\uDF43\uDF50-\uDF59\uDF63-\uDF77\uDF7D-\uDF8F]|\uD81B[\uDF00-\uDF44\uDF50-\uDF7E\uDF8F-\uDF9F\uDFE0]|\uD821[\uDC00-\uDFEC]|\uD822[\uDC00-\uDEF2]|\uD82C[\uDC00\uDC01]|\uD82F[\uDC00-\uDC6A\uDC70-\uDC7C\uDC80-\uDC88\uDC90-\uDC99\uDC9D\uDC9E]|\uD834[\uDD65-\uDD69\uDD6D-\uDD72\uDD7B-\uDD82\uDD85-\uDD8B\uDDAA-\uDDAD\uDE42-\uDE44]|\uD835[\uDC00-\uDC54\uDC56-\uDC9C\uDC9E\uDC9F\uDCA2\uDCA5\uDCA6\uDCA9-\uDCAC\uDCAE-\uDCB9\uDCBB\uDCBD-\uDCC3\uDCC5-\uDD05\uDD07-\uDD0A\uDD0D-\uDD14\uDD16-\uDD1C\uDD1E-\uDD39\uDD3B-\uDD3E\uDD40-\uDD44\uDD46\uDD4A-\uDD50\uDD52-\uDEA5\uDEA8-\uDEC0\uDEC2-\uDEDA\uDEDC-\uDEFA\uDEFC-\uDF14\uDF16-\uDF34\uDF36-\uDF4E\uDF50-\uDF6E\uDF70-\uDF88\uDF8A-\uDFA8\uDFAA-\uDFC2\uDFC4-\uDFCB\uDFCE-\uDFFF]|\uD836[\uDE00-\uDE36\uDE3B-\uDE6C\uDE75\uDE84\uDE9B-\uDE9F\uDEA1-\uDEAF]|\uD838[\uDC00-\uDC06\uDC08-\uDC18\uDC1B-\uDC21\uDC23\uDC24\uDC26-\uDC2A]|\uD83A[\uDC00-\uDCC4\uDCD0-\uDCD6\uDD00-\uDD4A\uDD50-\uDD59]|\uD83B[\uDE00-\uDE03\uDE05-\uDE1F\uDE21\uDE22\uDE24\uDE27\uDE29-\uDE32\uDE34-\uDE37\uDE39\uDE3B\uDE42\uDE47\uDE49\uDE4B\uDE4D-\uDE4F\uDE51\uDE52\uDE54\uDE57\uDE59\uDE5B\uDE5D\uDE5F\uDE61\uDE62\uDE64\uDE67-\uDE6A\uDE6C-\uDE72\uDE74-\uDE77\uDE79-\uDE7C\uDE7E\uDE80-\uDE89\uDE8B-\uDE9B\uDEA1-\uDEA3\uDEA5-\uDEA9\uDEAB-\uDEBB]|\uD869[\uDC00-\uDED6\uDF00-\uDFFF]|\uD86D[\uDC00-\uDF34\uDF40-\uDFFF]|\uD86E[\uDC00-\uDC1D\uDC20-\uDFFF]|\uD873[\uDC00-\uDEA1]|\uD87E[\uDC00-\uDE1D]|\uDB40[\uDD00-\uDDEF]/
    };

    function isDecimalDigit(ch) {
        return 0x30 <= ch && ch <= 0x39;  // 0..9
    }

    function isHexDigit(ch) {
        return 0x30 <= ch && ch <= 0x39 ||  // 0..9
            0x61 <= ch && ch <= 0x66 ||     // a..f
            0x41 <= ch && ch <= 0x46;       // A..F
    }

    function isOctalDigit(ch) {
        return ch >= 0x30 && ch <= 0x37;  // 0..7
    }

    // 7.2 White Space

    NON_ASCII_WHITESPACES = [
        0x1680,
        0x2000, 0x2001, 0x2002, 0x2003, 0x2004, 0x2005, 0x2006, 0x2007, 0x2008, 0x2009, 0x200A,
        0x202F, 0x205F,
        0x3000,
        0xFEFF
    ];

    function isWhiteSpace(ch) {
        return ch === 0x20 || ch === 0x09 || ch === 0x0B || ch === 0x0C || ch === 0xA0 ||
            ch >= 0x1680 && NON_ASCII_WHITESPACES.indexOf(ch) >= 0;
    }

    // 7.3 Line Terminators

    function isLineTerminator(ch) {
        return ch === 0x0A || ch === 0x0D || ch === 0x2028 || ch === 0x2029;
    }

    // 7.6 Identifier Names and Identifiers

    function fromCodePoint(cp) {
        if (cp <= 0xFFFF) { return String.fromCharCode(cp); }
        var cu1 = String.fromCharCode(Math.floor((cp - 0x10000) / 0x400) + 0xD800);
        var cu2 = String.fromCharCode(((cp - 0x10000) % 0x400) + 0xDC00);
        return cu1 + cu2;
    }

    IDENTIFIER_START = new Array(0x80);
    for(ch = 0; ch < 0x80; ++ch) {
        IDENTIFIER_START[ch] =
            ch >= 0x61 && ch <= 0x7A ||  // a..z
            ch >= 0x41 && ch <= 0x5A ||  // A..Z
            ch === 0x24 || ch === 0x5F;  // $ (dollar) and _ (underscore)
    }

    IDENTIFIER_PART = new Array(0x80);
    for(ch = 0; ch < 0x80; ++ch) {
        IDENTIFIER_PART[ch] =
            ch >= 0x61 && ch <= 0x7A ||  // a..z
            ch >= 0x41 && ch <= 0x5A ||  // A..Z
            ch >= 0x30 && ch <= 0x39 ||  // 0..9
            ch === 0x24 || ch === 0x5F;  // $ (dollar) and _ (underscore)
    }

    function isIdentifierStartES5(ch) {
        return ch < 0x80 ? IDENTIFIER_START[ch] : ES5Regex.NonAsciiIdentifierStart.test(fromCodePoint(ch));
    }

    function isIdentifierPartES5(ch) {
        return ch < 0x80 ? IDENTIFIER_PART[ch] : ES5Regex.NonAsciiIdentifierPart.test(fromCodePoint(ch));
    }

    function isIdentifierStartES6(ch) {
        return ch < 0x80 ? IDENTIFIER_START[ch] : ES6Regex.NonAsciiIdentifierStart.test(fromCodePoint(ch));
    }

    function isIdentifierPartES6(ch) {
        return ch < 0x80 ? IDENTIFIER_PART[ch] : ES6Regex.NonAsciiIdentifierPart.test(fromCodePoint(ch));
    }

    module.exports = {
        isDecimalDigit: isDecimalDigit,
        isHexDigit: isHexDigit,
        isOctalDigit: isOctalDigit,
        isWhiteSpace: isWhiteSpace,
        isLineTerminator: isLineTerminator,
        isIdentifierStartES5: isIdentifierStartES5,
        isIdentifierPartES5: isIdentifierPartES5,
        isIdentifierStartES6: isIdentifierStartES6,
        isIdentifierPartES6: isIdentifierPartES6
    };
}());
/* vim: set sw=4 ts=4 et tw=80 : */
// hack-istanbul - inline-require
esutils = { code: module.exports }; }());


/*
repo https://github.com/estools/escodegen/tree/v1.12.0
committed 2019-08-13T02:08:40Z
*/


/*
file https://github.com/estools/escodegen/blob/v1.12.0/escodegen.js
*/
// hack-istanbul - inline-require
/* istanbul ignore next */
(function () { let exports; exports = escodegen;
/*
  Copyright (C) 2012-2014 Yusuke Suzuki <utatane.tea@gmail.com>
  Copyright (C) 2015 Ingvar Stepanyan <me@rreverser.com>
  Copyright (C) 2014 Ivan Nikulin <ifaaan@gmail.com>
  Copyright (C) 2012-2013 Michael Ficarra <escodegen.copyright@michael.ficarra.me>
  Copyright (C) 2012-2013 Mathias Bynens <mathias@qiwi.be>
  Copyright (C) 2013 Irakli Gozalishvili <rfobic@gmail.com>
  Copyright (C) 2012 Robert Gust-Bardon <donate@robert.gust-bardon.org>
  Copyright (C) 2012 John Freeman <jfreeman08@gmail.com>
  Copyright (C) 2011-2012 Ariya Hidayat <ariya.hidayat@gmail.com>
  Copyright (C) 2012 Joost-Wim Boekesteijn <joost-wim@boekesteijn.nl>
  Copyright (C) 2012 Kris Kowal <kris.kowal@cixar.com>
  Copyright (C) 2012 Arpad Borsos <arpad.borsos@googlemail.com>

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/*global exports:true, require:true, global:true*/
(function () {
    'use strict';

    var Syntax,
        Precedence,
        BinaryPrecedence,
        SourceNode,
        // hack-istanbul - inline-require
        // estraverse,
        // esutils,
        base,
        indent,
        json,
        renumber,
        hexadecimal,
        quotes,
        escapeless,
        newline,
        space,
        parentheses,
        semicolons,
        safeConcatenation,
        directive,
        extra,
        parse,
        sourceMap,
        sourceCode,
        preserveBlankLines,
        FORMAT_MINIFY,
        FORMAT_DEFAULTS;

    // hack-istanbul - inline-require
    // estraverse = require('estraverse');
    // esutils = require('esutils');

    Syntax = estraverse.Syntax;

    // Generation is done by generateExpression.
    function isExpression(node) {
        return CodeGenerator.Expression.hasOwnProperty(node.type);
    }

    // Generation is done by generateStatement.
    function isStatement(node) {
        return CodeGenerator.Statement.hasOwnProperty(node.type);
    }

    Precedence = {
        Sequence: 0,
        Yield: 1,
        Assignment: 1,
        Conditional: 2,
        ArrowFunction: 2,
        LogicalOR: 3,
        LogicalAND: 4,
        BitwiseOR: 5,
        BitwiseXOR: 6,
        BitwiseAND: 7,
        Equality: 8,
        Relational: 9,
        BitwiseSHIFT: 10,
        Additive: 11,
        Multiplicative: 12,
        Await: 13,
        Unary: 13,
        Postfix: 14,
        Call: 15,
        New: 16,
        TaggedTemplate: 17,
        Member: 18,
        Primary: 19
    };

    BinaryPrecedence = {
        '||': Precedence.LogicalOR,
        '&&': Precedence.LogicalAND,
        '|': Precedence.BitwiseOR,
        '^': Precedence.BitwiseXOR,
        '&': Precedence.BitwiseAND,
        '==': Precedence.Equality,
        '!=': Precedence.Equality,
        '===': Precedence.Equality,
        '!==': Precedence.Equality,
        'is': Precedence.Equality,
        'isnt': Precedence.Equality,
        '<': Precedence.Relational,
        '>': Precedence.Relational,
        '<=': Precedence.Relational,
        '>=': Precedence.Relational,
        'in': Precedence.Relational,
        'instanceof': Precedence.Relational,
        '<<': Precedence.BitwiseSHIFT,
        '>>': Precedence.BitwiseSHIFT,
        '>>>': Precedence.BitwiseSHIFT,
        '+': Precedence.Additive,
        '-': Precedence.Additive,
        '*': Precedence.Multiplicative,
        '%': Precedence.Multiplicative,
        '/': Precedence.Multiplicative
    };

    //Flags
    var F_ALLOW_IN = 1,
        F_ALLOW_CALL = 1 << 1,
        F_ALLOW_UNPARATH_NEW = 1 << 2,
        F_FUNC_BODY = 1 << 3,
        F_DIRECTIVE_CTX = 1 << 4,
        F_SEMICOLON_OPT = 1 << 5;

    //Expression flag sets
    //NOTE: Flag order:
    // F_ALLOW_IN
    // F_ALLOW_CALL
    // F_ALLOW_UNPARATH_NEW
    var E_FTT = F_ALLOW_CALL | F_ALLOW_UNPARATH_NEW,
        E_TTF = F_ALLOW_IN | F_ALLOW_CALL,
        E_TTT = F_ALLOW_IN | F_ALLOW_CALL | F_ALLOW_UNPARATH_NEW,
        E_TFF = F_ALLOW_IN,
        E_FFT = F_ALLOW_UNPARATH_NEW,
        E_TFT = F_ALLOW_IN | F_ALLOW_UNPARATH_NEW;

    //Statement flag sets
    //NOTE: Flag order:
    // F_ALLOW_IN
    // F_FUNC_BODY
    // F_DIRECTIVE_CTX
    // F_SEMICOLON_OPT
    var S_TFFF = F_ALLOW_IN,
        S_TFFT = F_ALLOW_IN | F_SEMICOLON_OPT,
        S_FFFF = 0x00,
        S_TFTF = F_ALLOW_IN | F_DIRECTIVE_CTX,
        S_TTFF = F_ALLOW_IN | F_FUNC_BODY;

    function getDefaultOptions() {
        // default options
        return {
            indent: null,
            base: null,
            parse: null,
            comment: false,
            format: {
                indent: {
                    style: '    ',
                    base: 0,
                    adjustMultilineComment: false
                },
                newline: '\n',
                space: ' ',
                json: false,
                renumber: false,
                hexadecimal: false,
                quotes: 'single',
                escapeless: false,
                compact: false,
                parentheses: true,
                semicolons: true,
                safeConcatenation: false,
                preserveBlankLines: false
            },
            moz: {
                comprehensionExpressionStartsWithAssignment: false,
                starlessGenerator: false
            },
            sourceMap: null,
            sourceMapRoot: null,
            sourceMapWithCode: false,
            directive: false,
            raw: true,
            verbatim: null,
            sourceCode: null
        };
    }

    function stringRepeat(str, num) {
        var result = '';

        for (num |= 0; num > 0; num >>>= 1, str += str) {
            if (num & 1) {
                result += str;
            }
        }

        return result;
    }

    function hasLineTerminator(str) {
        return (/[\r\n]/g).test(str);
    }

    function endsWithLineTerminator(str) {
        var len = str.length;
        return len && esutils.code.isLineTerminator(str.charCodeAt(len - 1));
    }

    function merge(target, override) {
        var key;
        for (key in override) {
            if (override.hasOwnProperty(key)) {
                target[key] = override[key];
            }
        }
        return target;
    }

    function updateDeeply(target, override) {
        var key, val;

        function isHashObject(target) {
            return typeof target === 'object' && target instanceof Object && !(target instanceof RegExp);
        }

        for (key in override) {
            if (override.hasOwnProperty(key)) {
                val = override[key];
                if (isHashObject(val)) {
                    if (isHashObject(target[key])) {
                        updateDeeply(target[key], val);
                    } else {
                        target[key] = updateDeeply({}, val);
                    }
                } else {
                    target[key] = val;
                }
            }
        }
        return target;
    }

    function generateNumber(value) {
        var result, point, temp, exponent, pos;

        if (value !== value) {
            throw new Error('Numeric literal whose value is NaN');
        }
        if (value < 0 || (value === 0 && 1 / value < 0)) {
            throw new Error('Numeric literal whose value is negative');
        }

        if (value === 1 / 0) {
            return json ? 'null' : renumber ? '1e400' : '1e+400';
        }

        result = '' + value;
        if (!renumber || result.length < 3) {
            return result;
        }

        point = result.indexOf('.');
        if (!json && result.charCodeAt(0) === 0x30  /* 0 */ && point === 1) {
            point = 0;
            result = result.slice(1);
        }
        temp = result;
        result = result.replace('e+', 'e');
        exponent = 0;
        if ((pos = temp.indexOf('e')) > 0) {
            exponent = +temp.slice(pos + 1);
            temp = temp.slice(0, pos);
        }
        if (point >= 0) {
            exponent -= temp.length - point - 1;
            temp = +(temp.slice(0, point) + temp.slice(point + 1)) + '';
        }
        pos = 0;
        while (temp.charCodeAt(temp.length + pos - 1) === 0x30  /* 0 */) {
            --pos;
        }
        if (pos !== 0) {
            exponent -= pos;
            temp = temp.slice(0, pos);
        }
        if (exponent !== 0) {
            temp += 'e' + exponent;
        }
        if ((temp.length < result.length ||
                    (hexadecimal && value > 1e12 && Math.floor(value) === value && (temp = '0x' + value.toString(16)).length < result.length)) &&
                +temp === value) {
            result = temp;
        }

        return result;
    }

    // Generate valid RegExp expression.
    // This function is based on https://github.com/Constellation/iv Engine

    function escapeRegExpCharacter(ch, previousIsBackslash) {
        // not handling '\' and handling \u2028 or \u2029 to unicode escape sequence
        if ((ch & ~1) === 0x2028) {
            return (previousIsBackslash ? 'u' : '\\u') + ((ch === 0x2028) ? '2028' : '2029');
        } else if (ch === 10 || ch === 13) {  // \n, \r
            return (previousIsBackslash ? '' : '\\') + ((ch === 10) ? 'n' : 'r');
        }
        return String.fromCharCode(ch);
    }

    function generateRegExp(reg) {
        var match, result, flags, i, iz, ch, characterInBrack, previousIsBackslash;

        result = reg.toString();

        if (reg.source) {
            // extract flag from toString result
            match = result.match(/\/([^/]*)$/);
            if (!match) {
                return result;
            }

            flags = match[1];
            result = '';

            characterInBrack = false;
            previousIsBackslash = false;
            for (i = 0, iz = reg.source.length; i < iz; ++i) {
                ch = reg.source.charCodeAt(i);

                if (!previousIsBackslash) {
                    if (characterInBrack) {
                        if (ch === 93) {  // ]
                            characterInBrack = false;
                        }
                    } else {
                        if (ch === 47) {  // /
                            result += '\\';
                        } else if (ch === 91) {  // [
                            characterInBrack = true;
                        }
                    }
                    result += escapeRegExpCharacter(ch, previousIsBackslash);
                    previousIsBackslash = ch === 92;  // \
                } else {
                    // if new RegExp("\\\n') is provided, create /\n/
                    result += escapeRegExpCharacter(ch, previousIsBackslash);
                    // prevent like /\\[/]/
                    previousIsBackslash = false;
                }
            }

            return '/' + result + '/' + flags;
        }

        return result;
    }

    function escapeAllowedCharacter(code, next) {
        var hex;

        if (code === 0x08  /* \b */) {
            return '\\b';
        }

        if (code === 0x0C  /* \f */) {
            return '\\f';
        }

        if (code === 0x09  /* \t */) {
            return '\\t';
        }

        hex = code.toString(16).toUpperCase();
        if (json || code > 0xFF) {
            return '\\u' + '0000'.slice(hex.length) + hex;
        } else if (code === 0x0000 && !esutils.code.isDecimalDigit(next)) {
            return '\\0';
        } else if (code === 0x000B  /* \v */) { // '\v'
            return '\\x0B';
        } else {
            return '\\x' + '00'.slice(hex.length) + hex;
        }
    }

    function escapeDisallowedCharacter(code) {
        if (code === 0x5C  /* \ */) {
            return '\\\\';
        }

        if (code === 0x0A  /* \n */) {
            return '\\n';
        }

        if (code === 0x0D  /* \r */) {
            return '\\r';
        }

        if (code === 0x2028) {
            return '\\u2028';
        }

        if (code === 0x2029) {
            return '\\u2029';
        }

        throw new Error('Incorrectly classified character');
    }

    function escapeDirective(str) {
        var i, iz, code, quote;

        quote = quotes === 'double' ? '"' : '\'';
        for (i = 0, iz = str.length; i < iz; ++i) {
            code = str.charCodeAt(i);
            if (code === 0x27  /* ' */) {
                quote = '"';
                break;
            } else if (code === 0x22  /* " */) {
                quote = '\'';
                break;
            } else if (code === 0x5C  /* \ */) {
                ++i;
            }
        }

        return quote + str + quote;
    }

    function escapeString(str) {
        var result = '', i, len, code, singleQuotes = 0, doubleQuotes = 0, single, quote;

        for (i = 0, len = str.length; i < len; ++i) {
            code = str.charCodeAt(i);
            if (code === 0x27  /* ' */) {
                ++singleQuotes;
            } else if (code === 0x22  /* " */) {
                ++doubleQuotes;
            } else if (code === 0x2F  /* / */ && json) {
                result += '\\';
            } else if (esutils.code.isLineTerminator(code) || code === 0x5C  /* \ */) {
                result += escapeDisallowedCharacter(code);
                continue;
            } else if (!esutils.code.isIdentifierPartES5(code) && (json && code < 0x20  /* SP */ || !json && !escapeless && (code < 0x20  /* SP */ || code > 0x7E  /* ~ */))) {
                result += escapeAllowedCharacter(code, str.charCodeAt(i + 1));
                continue;
            }
            result += String.fromCharCode(code);
        }

        single = !(quotes === 'double' || (quotes === 'auto' && doubleQuotes < singleQuotes));
        quote = single ? '\'' : '"';

        if (!(single ? singleQuotes : doubleQuotes)) {
            return quote + result + quote;
        }

        str = result;
        result = quote;

        for (i = 0, len = str.length; i < len; ++i) {
            code = str.charCodeAt(i);
            if ((code === 0x27  /* ' */ && single) || (code === 0x22  /* " */ && !single)) {
                result += '\\';
            }
            result += String.fromCharCode(code);
        }

        return result + quote;
    }

    /**
     * flatten an array to a string, where the array can contain
     * either strings or nested arrays
     */
    function flattenToString(arr) {
        var i, iz, elem, result = '';
        for (i = 0, iz = arr.length; i < iz; ++i) {
            elem = arr[i];
            result += Array.isArray(elem) ? flattenToString(elem) : elem;
        }
        return result;
    }

    /**
     * convert generated to a SourceNode when source maps are enabled.
     */
    function toSourceNodeWhenNeeded(generated, node) {
        if (!sourceMap) {
            // with no source maps, generated is either an
            // array or a string.  if an array, flatten it.
            // if a string, just return it
            if (Array.isArray(generated)) {
                return flattenToString(generated);
            } else {
                return generated;
            }
        }
        if (node == null) {
            if (generated instanceof SourceNode) {
                return generated;
            } else {
                node = {};
            }
        }
        if (node.loc == null) {
            return new SourceNode(null, null, sourceMap, generated, node.name || null);
        }
        return new SourceNode(node.loc.start.line, node.loc.start.column, (sourceMap === true ? node.loc.source || null : sourceMap), generated, node.name || null);
    }

    function noEmptySpace() {
        return (space) ? space : ' ';
    }

    function join(left, right) {
        var leftSource,
            rightSource,
            leftCharCode,
            rightCharCode;

        leftSource = toSourceNodeWhenNeeded(left).toString();
        if (leftSource.length === 0) {
            return [right];
        }

        rightSource = toSourceNodeWhenNeeded(right).toString();
        if (rightSource.length === 0) {
            return [left];
        }

        leftCharCode = leftSource.charCodeAt(leftSource.length - 1);
        rightCharCode = rightSource.charCodeAt(0);

        if ((leftCharCode === 0x2B  /* + */ || leftCharCode === 0x2D  /* - */) && leftCharCode === rightCharCode ||
            esutils.code.isIdentifierPartES5(leftCharCode) && esutils.code.isIdentifierPartES5(rightCharCode) ||
            leftCharCode === 0x2F  /* / */ && rightCharCode === 0x69  /* i */) { // infix word operators all start with `i`
            return [left, noEmptySpace(), right];
        } else if (esutils.code.isWhiteSpace(leftCharCode) || esutils.code.isLineTerminator(leftCharCode) ||
                esutils.code.isWhiteSpace(rightCharCode) || esutils.code.isLineTerminator(rightCharCode)) {
            return [left, right];
        }
        return [left, space, right];
    }

    function addIndent(stmt) {
        return [base, stmt];
    }

    function withIndent(fn) {
        var previousBase;
        previousBase = base;
        base += indent;
        fn(base);
        base = previousBase;
    }

    function calculateSpaces(str) {
        var i;
        for (i = str.length - 1; i >= 0; --i) {
            if (esutils.code.isLineTerminator(str.charCodeAt(i))) {
                break;
            }
        }
        return (str.length - 1) - i;
    }

    function adjustMultilineComment(value, specialBase) {
        var array, i, len, line, j, spaces, previousBase, sn;

        array = value.split(/\r\n|[\r\n]/);
        spaces = Number.MAX_VALUE;

        // first line doesn't have indentation
        for (i = 1, len = array.length; i < len; ++i) {
            line = array[i];
            j = 0;
            while (j < line.length && esutils.code.isWhiteSpace(line.charCodeAt(j))) {
                ++j;
            }
            if (spaces > j) {
                spaces = j;
            }
        }

        if (typeof specialBase !== 'undefined') {
            // pattern like
            // {
            //   var t = 20;  /*
            //                 * this is comment
            //                 */
            // }
            previousBase = base;
            if (array[1][spaces] === '*') {
                specialBase += ' ';
            }
            base = specialBase;
        } else {
            if (spaces & 1) {
                // /*
                //  *
                //  */
                // If spaces are odd number, above pattern is considered.
                // We waste 1 space.
                --spaces;
            }
            previousBase = base;
        }

        for (i = 1, len = array.length; i < len; ++i) {
            sn = toSourceNodeWhenNeeded(addIndent(array[i].slice(spaces)));
            array[i] = sourceMap ? sn.join('') : sn;
        }

        base = previousBase;

        return array.join('\n');
    }

    function generateComment(comment, specialBase) {
        if (comment.type === 'Line') {
            if (endsWithLineTerminator(comment.value)) {
                return '//' + comment.value;
            } else {
                // Always use LineTerminator
                var result = '//' + comment.value;
                if (!preserveBlankLines) {
                    result += '\n';
                }
                return result;
            }
        }
        if (extra.format.indent.adjustMultilineComment && /[\n\r]/.test(comment.value)) {
            return adjustMultilineComment('/*' + comment.value + '*/', specialBase);
        }
        return '/*' + comment.value + '*/';
    }

    function addComments(stmt, result) {
        var i, len, comment, save, tailingToStatement, specialBase, fragment,
            extRange, range, prevRange, prefix, infix, suffix, count;

        if (stmt.leadingComments && stmt.leadingComments.length > 0) {
            save = result;

            if (preserveBlankLines) {
                comment = stmt.leadingComments[0];
                result = [];

                extRange = comment.extendedRange;
                range = comment.range;

                prefix = sourceCode.substring(extRange[0], range[0]);
                count = (prefix.match(/\n/g) || []).length;
                if (count > 0) {
                    result.push(stringRepeat('\n', count));
                    result.push(addIndent(generateComment(comment)));
                } else {
                    result.push(prefix);
                    result.push(generateComment(comment));
                }

                prevRange = range;

                for (i = 1, len = stmt.leadingComments.length; i < len; i++) {
                    comment = stmt.leadingComments[i];
                    range = comment.range;

                    infix = sourceCode.substring(prevRange[1], range[0]);
                    count = (infix.match(/\n/g) || []).length;
                    result.push(stringRepeat('\n', count));
                    result.push(addIndent(generateComment(comment)));

                    prevRange = range;
                }

                suffix = sourceCode.substring(range[1], extRange[1]);
                count = (suffix.match(/\n/g) || []).length;
                result.push(stringRepeat('\n', count));
            } else {
                comment = stmt.leadingComments[0];
                result = [];
                if (safeConcatenation && stmt.type === Syntax.Program && stmt.body.length === 0) {
                    result.push('\n');
                }
                result.push(generateComment(comment));
                if (!endsWithLineTerminator(toSourceNodeWhenNeeded(result).toString())) {
                    result.push('\n');
                }

                for (i = 1, len = stmt.leadingComments.length; i < len; ++i) {
                    comment = stmt.leadingComments[i];
                    fragment = [generateComment(comment)];
                    if (!endsWithLineTerminator(toSourceNodeWhenNeeded(fragment).toString())) {
                        fragment.push('\n');
                    }
                    result.push(addIndent(fragment));
                }
            }

            result.push(addIndent(save));
        }

        if (stmt.trailingComments) {

            if (preserveBlankLines) {
                comment = stmt.trailingComments[0];
                extRange = comment.extendedRange;
                range = comment.range;

                prefix = sourceCode.substring(extRange[0], range[0]);
                count = (prefix.match(/\n/g) || []).length;

                if (count > 0) {
                    result.push(stringRepeat('\n', count));
                    result.push(addIndent(generateComment(comment)));
                } else {
                    result.push(prefix);
                    result.push(generateComment(comment));
                }
            } else {
                tailingToStatement = !endsWithLineTerminator(toSourceNodeWhenNeeded(result).toString());
                specialBase = stringRepeat(' ', calculateSpaces(toSourceNodeWhenNeeded([base, result, indent]).toString()));
                for (i = 0, len = stmt.trailingComments.length; i < len; ++i) {
                    comment = stmt.trailingComments[i];
                    if (tailingToStatement) {
                        // We assume target like following script
                        //
                        // var t = 20;  /**
                        //               * This is comment of t
                        //               */
                        if (i === 0) {
                            // first case
                            result = [result, indent];
                        } else {
                            result = [result, specialBase];
                        }
                        result.push(generateComment(comment, specialBase));
                    } else {
                        result = [result, addIndent(generateComment(comment))];
                    }
                    if (i !== len - 1 && !endsWithLineTerminator(toSourceNodeWhenNeeded(result).toString())) {
                        result = [result, '\n'];
                    }
                }
            }
        }

        return result;
    }

    function generateBlankLines(start, end, result) {
        var j, newlineCount = 0;

        for (j = start; j < end; j++) {
            if (sourceCode[j] === '\n') {
                newlineCount++;
            }
        }

        for (j = 1; j < newlineCount; j++) {
            result.push(newline);
        }
    }

    function parenthesize(text, current, should) {
        if (current < should) {
            return ['(', text, ')'];
        }
        return text;
    }

    function generateVerbatimString(string) {
        var i, iz, result;
        result = string.split(/\r\n|\n/);
        for (i = 1, iz = result.length; i < iz; i++) {
            result[i] = newline + base + result[i];
        }
        return result;
    }

    function generateVerbatim(expr, precedence) {
        var verbatim, result, prec;
        verbatim = expr[extra.verbatim];

        if (typeof verbatim === 'string') {
            result = parenthesize(generateVerbatimString(verbatim), Precedence.Sequence, precedence);
        } else {
            // verbatim is object
            result = generateVerbatimString(verbatim.content);
            prec = (verbatim.precedence != null) ? verbatim.precedence : Precedence.Sequence;
            result = parenthesize(result, prec, precedence);
        }

        return toSourceNodeWhenNeeded(result, expr);
    }

    function CodeGenerator() {
    }

    // Helpers.

    CodeGenerator.prototype.maybeBlock = function(stmt, flags) {
        var result, noLeadingComment, that = this;

        noLeadingComment = !extra.comment || !stmt.leadingComments;

        if (stmt.type === Syntax.BlockStatement && noLeadingComment) {
            return [space, this.generateStatement(stmt, flags)];
        }

        if (stmt.type === Syntax.EmptyStatement && noLeadingComment) {
            return ';';
        }

        withIndent(function () {
            result = [
                newline,
                addIndent(that.generateStatement(stmt, flags))
            ];
        });

        return result;
    };

    CodeGenerator.prototype.maybeBlockSuffix = function (stmt, result) {
        var ends = endsWithLineTerminator(toSourceNodeWhenNeeded(result).toString());
        if (stmt.type === Syntax.BlockStatement && (!extra.comment || !stmt.leadingComments) && !ends) {
            return [result, space];
        }
        if (ends) {
            return [result, base];
        }
        return [result, newline, base];
    };

    function generateIdentifier(node) {
        return toSourceNodeWhenNeeded(node.name, node);
    }

    function generateAsyncPrefix(node, spaceRequired) {
        return node.async ? 'async' + (spaceRequired ? noEmptySpace() : space) : '';
    }

    function generateStarSuffix(node) {
        var isGenerator = node.generator && !extra.moz.starlessGenerator;
        return isGenerator ? '*' + space : '';
    }

    function generateMethodPrefix(prop) {
        var func = prop.value, prefix = '';
        if (func.async) {
            prefix += generateAsyncPrefix(func, !prop.computed);
        }
        if (func.generator) {
            // avoid space before method name
            prefix += generateStarSuffix(func) ? '*' : '';
        }
        return prefix;
    }

    CodeGenerator.prototype.generatePattern = function (node, precedence, flags) {
        if (node.type === Syntax.Identifier) {
            return generateIdentifier(node);
        }
        return this.generateExpression(node, precedence, flags);
    };

    CodeGenerator.prototype.generateFunctionParams = function (node) {
        var i, iz, result, hasDefault;

        hasDefault = false;

        if (node.type === Syntax.ArrowFunctionExpression &&
                !node.rest && (!node.defaults || node.defaults.length === 0) &&
                node.params.length === 1 && node.params[0].type === Syntax.Identifier) {
            // arg => { } case
            result = [generateAsyncPrefix(node, true), generateIdentifier(node.params[0])];
        } else {
            result = node.type === Syntax.ArrowFunctionExpression ? [generateAsyncPrefix(node, false)] : [];
            result.push('(');
            if (node.defaults) {
                hasDefault = true;
            }
            for (i = 0, iz = node.params.length; i < iz; ++i) {
                if (hasDefault && node.defaults[i]) {
                    // Handle default values.
                    result.push(this.generateAssignment(node.params[i], node.defaults[i], '=', Precedence.Assignment, E_TTT));
                } else {
                    result.push(this.generatePattern(node.params[i], Precedence.Assignment, E_TTT));
                }
                if (i + 1 < iz) {
                    result.push(',' + space);
                }
            }

            if (node.rest) {
                if (node.params.length) {
                    result.push(',' + space);
                }
                result.push('...');
                result.push(generateIdentifier(node.rest));
            }

            result.push(')');
        }

        return result;
    };

    CodeGenerator.prototype.generateFunctionBody = function (node) {
        var result, expr;

        result = this.generateFunctionParams(node);

        if (node.type === Syntax.ArrowFunctionExpression) {
            result.push(space);
            result.push('=>');
        }

        if (node.expression) {
            result.push(space);
            expr = this.generateExpression(node.body, Precedence.Assignment, E_TTT);
            if (expr.toString().charAt(0) === '{') {
                expr = ['(', expr, ')'];
            }
            result.push(expr);
        } else {
            result.push(this.maybeBlock(node.body, S_TTFF));
        }

        return result;
    };

    CodeGenerator.prototype.generateIterationForStatement = function (operator, stmt, flags) {
        var result = ['for' + space + (stmt.await ? 'await' + space : '') + '('], that = this;
        withIndent(function () {
            if (stmt.left.type === Syntax.VariableDeclaration) {
                withIndent(function () {
                    result.push(stmt.left.kind + noEmptySpace());
                    result.push(that.generateStatement(stmt.left.declarations[0], S_FFFF));
                });
            } else {
                result.push(that.generateExpression(stmt.left, Precedence.Call, E_TTT));
            }

            result = join(result, operator);
            result = [join(
                result,
                that.generateExpression(stmt.right, Precedence.Assignment, E_TTT)
            ), ')'];
        });
        result.push(this.maybeBlock(stmt.body, flags));
        return result;
    };

    CodeGenerator.prototype.generatePropertyKey = function (expr, computed) {
        var result = [];

        if (computed) {
            result.push('[');
        }

        result.push(this.generateExpression(expr, Precedence.Sequence, E_TTT));

        if (computed) {
            result.push(']');
        }

        return result;
    };

    CodeGenerator.prototype.generateAssignment = function (left, right, operator, precedence, flags) {
        if (Precedence.Assignment < precedence) {
            flags |= F_ALLOW_IN;
        }

        return parenthesize(
            [
                this.generateExpression(left, Precedence.Call, flags),
                space + operator + space,
                this.generateExpression(right, Precedence.Assignment, flags)
            ],
            Precedence.Assignment,
            precedence
        );
    };

    CodeGenerator.prototype.semicolon = function (flags) {
        if (!semicolons && flags & F_SEMICOLON_OPT) {
            return '';
        }
        return ';';
    };

    // Statements.

    CodeGenerator.Statement = {

        BlockStatement: function (stmt, flags) {
            var range, content, result = ['{', newline], that = this;

            withIndent(function () {
                // handle functions without any code
                if (stmt.body.length === 0 && preserveBlankLines) {
                    range = stmt.range;
                    if (range[1] - range[0] > 2) {
                        content = sourceCode.substring(range[0] + 1, range[1] - 1);
                        if (content[0] === '\n') {
                            result = ['{'];
                        }
                        result.push(content);
                    }
                }

                var i, iz, fragment, bodyFlags;
                bodyFlags = S_TFFF;
                if (flags & F_FUNC_BODY) {
                    bodyFlags |= F_DIRECTIVE_CTX;
                }

                for (i = 0, iz = stmt.body.length; i < iz; ++i) {
                    if (preserveBlankLines) {
                        // handle spaces before the first line
                        if (i === 0) {
                            if (stmt.body[0].leadingComments) {
                                range = stmt.body[0].leadingComments[0].extendedRange;
                                content = sourceCode.substring(range[0], range[1]);
                                if (content[0] === '\n') {
                                    result = ['{'];
                                }
                            }
                            if (!stmt.body[0].leadingComments) {
                                generateBlankLines(stmt.range[0], stmt.body[0].range[0], result);
                            }
                        }

                        // handle spaces between lines
                        if (i > 0) {
                            if (!stmt.body[i - 1].trailingComments  && !stmt.body[i].leadingComments) {
                                generateBlankLines(stmt.body[i - 1].range[1], stmt.body[i].range[0], result);
                            }
                        }
                    }

                    if (i === iz - 1) {
                        bodyFlags |= F_SEMICOLON_OPT;
                    }

                    if (stmt.body[i].leadingComments && preserveBlankLines) {
                        fragment = that.generateStatement(stmt.body[i], bodyFlags);
                    } else {
                        fragment = addIndent(that.generateStatement(stmt.body[i], bodyFlags));
                    }

                    result.push(fragment);
                    if (!endsWithLineTerminator(toSourceNodeWhenNeeded(fragment).toString())) {
                        if (preserveBlankLines && i < iz - 1) {
                            // don't add a new line if there are leading coments
                            // in the next statement
                            if (!stmt.body[i + 1].leadingComments) {
                                result.push(newline);
                            }
                        } else {
                            result.push(newline);
                        }
                    }

                    if (preserveBlankLines) {
                        // handle spaces after the last line
                        if (i === iz - 1) {
                            if (!stmt.body[i].trailingComments) {
                                generateBlankLines(stmt.body[i].range[1], stmt.range[1], result);
                            }
                        }
                    }
                }
            });

            result.push(addIndent('}'));
            return result;
        },

        BreakStatement: function (stmt, flags) {
            if (stmt.label) {
                return 'break ' + stmt.label.name + this.semicolon(flags);
            }
            return 'break' + this.semicolon(flags);
        },

        ContinueStatement: function (stmt, flags) {
            if (stmt.label) {
                return 'continue ' + stmt.label.name + this.semicolon(flags);
            }
            return 'continue' + this.semicolon(flags);
        },

        ClassBody: function (stmt, flags) {
            var result = [ '{', newline], that = this;

            withIndent(function (indent) {
                var i, iz;

                for (i = 0, iz = stmt.body.length; i < iz; ++i) {
                    result.push(indent);
                    result.push(that.generateExpression(stmt.body[i], Precedence.Sequence, E_TTT));
                    if (i + 1 < iz) {
                        result.push(newline);
                    }
                }
            });

            if (!endsWithLineTerminator(toSourceNodeWhenNeeded(result).toString())) {
                result.push(newline);
            }
            result.push(base);
            result.push('}');
            return result;
        },

        ClassDeclaration: function (stmt, flags) {
            var result, fragment;
            result  = ['class'];
            if (stmt.id) {
                result = join(result, this.generateExpression(stmt.id, Precedence.Sequence, E_TTT));
            }
            if (stmt.superClass) {
                fragment = join('extends', this.generateExpression(stmt.superClass, Precedence.Assignment, E_TTT));
                result = join(result, fragment);
            }
            result.push(space);
            result.push(this.generateStatement(stmt.body, S_TFFT));
            return result;
        },

        DirectiveStatement: function (stmt, flags) {
            if (extra.raw && stmt.raw) {
                return stmt.raw + this.semicolon(flags);
            }
            return escapeDirective(stmt.directive) + this.semicolon(flags);
        },

        DoWhileStatement: function (stmt, flags) {
            // Because `do 42 while (cond)` is Syntax Error. We need semicolon.
            var result = join('do', this.maybeBlock(stmt.body, S_TFFF));
            result = this.maybeBlockSuffix(stmt.body, result);
            return join(result, [
                'while' + space + '(',
                this.generateExpression(stmt.test, Precedence.Sequence, E_TTT),
                ')' + this.semicolon(flags)
            ]);
        },

        CatchClause: function (stmt, flags) {
            var result, that = this;
            withIndent(function () {
                var guard;

                result = [
                    'catch' + space + '(',
                    that.generateExpression(stmt.param, Precedence.Sequence, E_TTT),
                    ')'
                ];

                if (stmt.guard) {
                    guard = that.generateExpression(stmt.guard, Precedence.Sequence, E_TTT);
                    result.splice(2, 0, ' if ', guard);
                }
            });
            result.push(this.maybeBlock(stmt.body, S_TFFF));
            return result;
        },

        DebuggerStatement: function (stmt, flags) {
            return 'debugger' + this.semicolon(flags);
        },

        EmptyStatement: function (stmt, flags) {
            return ';';
        },

        ExportDefaultDeclaration: function (stmt, flags) {
            var result = [ 'export' ], bodyFlags;

            bodyFlags = (flags & F_SEMICOLON_OPT) ? S_TFFT : S_TFFF;

            // export default HoistableDeclaration[Default]
            // export default AssignmentExpression[In] ;
            result = join(result, 'default');
            if (isStatement(stmt.declaration)) {
                result = join(result, this.generateStatement(stmt.declaration, bodyFlags));
            } else {
                result = join(result, this.generateExpression(stmt.declaration, Precedence.Assignment, E_TTT) + this.semicolon(flags));
            }
            return result;
        },

        ExportNamedDeclaration: function (stmt, flags) {
            var result = [ 'export' ], bodyFlags, that = this;

            bodyFlags = (flags & F_SEMICOLON_OPT) ? S_TFFT : S_TFFF;

            // export VariableStatement
            // export Declaration[Default]
            if (stmt.declaration) {
                return join(result, this.generateStatement(stmt.declaration, bodyFlags));
            }

            // export ExportClause[NoReference] FromClause ;
            // export ExportClause ;
            if (stmt.specifiers) {
                if (stmt.specifiers.length === 0) {
                    result = join(result, '{' + space + '}');
                } else if (stmt.specifiers[0].type === Syntax.ExportBatchSpecifier) {
                    result = join(result, this.generateExpression(stmt.specifiers[0], Precedence.Sequence, E_TTT));
                } else {
                    result = join(result, '{');
                    withIndent(function (indent) {
                        var i, iz;
                        result.push(newline);
                        for (i = 0, iz = stmt.specifiers.length; i < iz; ++i) {
                            result.push(indent);
                            result.push(that.generateExpression(stmt.specifiers[i], Precedence.Sequence, E_TTT));
                            if (i + 1 < iz) {
                                result.push(',' + newline);
                            }
                        }
                    });
                    if (!endsWithLineTerminator(toSourceNodeWhenNeeded(result).toString())) {
                        result.push(newline);
                    }
                    result.push(base + '}');
                }

                if (stmt.source) {
                    result = join(result, [
                        'from' + space,
                        // ModuleSpecifier
                        this.generateExpression(stmt.source, Precedence.Sequence, E_TTT),
                        this.semicolon(flags)
                    ]);
                } else {
                    result.push(this.semicolon(flags));
                }
            }
            return result;
        },

        ExportAllDeclaration: function (stmt, flags) {
            // export * FromClause ;
            return [
                'export' + space,
                '*' + space,
                'from' + space,
                // ModuleSpecifier
                this.generateExpression(stmt.source, Precedence.Sequence, E_TTT),
                this.semicolon(flags)
            ];
        },

        ExpressionStatement: function (stmt, flags) {
            var result, fragment;

            function isClassPrefixed(fragment) {
                var code;
                if (fragment.slice(0, 5) !== 'class') {
                    return false;
                }
                code = fragment.charCodeAt(5);
                return code === 0x7B  /* '{' */ || esutils.code.isWhiteSpace(code) || esutils.code.isLineTerminator(code);
            }

            function isFunctionPrefixed(fragment) {
                var code;
                if (fragment.slice(0, 8) !== 'function') {
                    return false;
                }
                code = fragment.charCodeAt(8);
                return code === 0x28 /* '(' */ || esutils.code.isWhiteSpace(code) || code === 0x2A  /* '*' */ || esutils.code.isLineTerminator(code);
            }

            function isAsyncPrefixed(fragment) {
                var code, i, iz;
                if (fragment.slice(0, 5) !== 'async') {
                    return false;
                }
                if (!esutils.code.isWhiteSpace(fragment.charCodeAt(5))) {
                    return false;
                }
                for (i = 6, iz = fragment.length; i < iz; ++i) {
                    if (!esutils.code.isWhiteSpace(fragment.charCodeAt(i))) {
                        break;
                    }
                }
                if (i === iz) {
                    return false;
                }
                if (fragment.slice(i, i + 8) !== 'function') {
                    return false;
                }
                code = fragment.charCodeAt(i + 8);
                return code === 0x28 /* '(' */ || esutils.code.isWhiteSpace(code) || code === 0x2A  /* '*' */ || esutils.code.isLineTerminator(code);
            }

            result = [this.generateExpression(stmt.expression, Precedence.Sequence, E_TTT)];
            // 12.4 '{', 'function', 'class' is not allowed in this position.
            // wrap expression with parentheses
            fragment = toSourceNodeWhenNeeded(result).toString();
            if (fragment.charCodeAt(0) === 0x7B  /* '{' */ ||  // ObjectExpression
                    isClassPrefixed(fragment) ||
                    isFunctionPrefixed(fragment) ||
                    isAsyncPrefixed(fragment) ||
                    (directive && (flags & F_DIRECTIVE_CTX) && stmt.expression.type === Syntax.Literal && typeof stmt.expression.value === 'string')) {
                result = ['(', result, ')' + this.semicolon(flags)];
            } else {
                result.push(this.semicolon(flags));
            }
            return result;
        },

        ImportDeclaration: function (stmt, flags) {
            // ES6: 15.2.1 valid import declarations:
            //     - import ImportClause FromClause ;
            //     - import ModuleSpecifier ;
            var result, cursor, that = this;

            // If no ImportClause is present,
            // this should be `import ModuleSpecifier` so skip `from`
            // ModuleSpecifier is StringLiteral.
            if (stmt.specifiers.length === 0) {
                // import ModuleSpecifier ;
                return [
                    'import',
                    space,
                    // ModuleSpecifier
                    this.generateExpression(stmt.source, Precedence.Sequence, E_TTT),
                    this.semicolon(flags)
                ];
            }

            // import ImportClause FromClause ;
            result = [
                'import'
            ];
            cursor = 0;

            // ImportedBinding
            if (stmt.specifiers[cursor].type === Syntax.ImportDefaultSpecifier) {
                result = join(result, [
                        this.generateExpression(stmt.specifiers[cursor], Precedence.Sequence, E_TTT)
                ]);
                ++cursor;
            }

            if (stmt.specifiers[cursor]) {
                if (cursor !== 0) {
                    result.push(',');
                }

                if (stmt.specifiers[cursor].type === Syntax.ImportNamespaceSpecifier) {
                    // NameSpaceImport
                    result = join(result, [
                            space,
                            this.generateExpression(stmt.specifiers[cursor], Precedence.Sequence, E_TTT)
                    ]);
                } else {
                    // NamedImports
                    result.push(space + '{');

                    if ((stmt.specifiers.length - cursor) === 1) {
                        // import { ... } from "...";
                        result.push(space);
                        result.push(this.generateExpression(stmt.specifiers[cursor], Precedence.Sequence, E_TTT));
                        result.push(space + '}' + space);
                    } else {
                        // import {
                        //    ...,
                        //    ...,
                        // } from "...";
                        withIndent(function (indent) {
                            var i, iz;
                            result.push(newline);
                            for (i = cursor, iz = stmt.specifiers.length; i < iz; ++i) {
                                result.push(indent);
                                result.push(that.generateExpression(stmt.specifiers[i], Precedence.Sequence, E_TTT));
                                if (i + 1 < iz) {
                                    result.push(',' + newline);
                                }
                            }
                        });
                        if (!endsWithLineTerminator(toSourceNodeWhenNeeded(result).toString())) {
                            result.push(newline);
                        }
                        result.push(base + '}' + space);
                    }
                }
            }

            result = join(result, [
                'from' + space,
                // ModuleSpecifier
                this.generateExpression(stmt.source, Precedence.Sequence, E_TTT),
                this.semicolon(flags)
            ]);
            return result;
        },

        VariableDeclarator: function (stmt, flags) {
            var itemFlags = (flags & F_ALLOW_IN) ? E_TTT : E_FTT;
            if (stmt.init) {
                return [
                    this.generateExpression(stmt.id, Precedence.Assignment, itemFlags),
                    space,
                    '=',
                    space,
                    this.generateExpression(stmt.init, Precedence.Assignment, itemFlags)
                ];
            }
            return this.generatePattern(stmt.id, Precedence.Assignment, itemFlags);
        },

        VariableDeclaration: function (stmt, flags) {
            // VariableDeclarator is typed as Statement,
            // but joined with comma (not LineTerminator).
            // So if comment is attached to target node, we should specialize.
            var result, i, iz, node, bodyFlags, that = this;

            result = [ stmt.kind ];

            bodyFlags = (flags & F_ALLOW_IN) ? S_TFFF : S_FFFF;

            function block() {
                node = stmt.declarations[0];
                if (extra.comment && node.leadingComments) {
                    result.push('\n');
                    result.push(addIndent(that.generateStatement(node, bodyFlags)));
                } else {
                    result.push(noEmptySpace());
                    result.push(that.generateStatement(node, bodyFlags));
                }

                for (i = 1, iz = stmt.declarations.length; i < iz; ++i) {
                    node = stmt.declarations[i];
                    if (extra.comment && node.leadingComments) {
                        result.push(',' + newline);
                        result.push(addIndent(that.generateStatement(node, bodyFlags)));
                    } else {
                        result.push(',' + space);
                        result.push(that.generateStatement(node, bodyFlags));
                    }
                }
            }

            if (stmt.declarations.length > 1) {
                withIndent(block);
            } else {
                block();
            }

            result.push(this.semicolon(flags));

            return result;
        },

        ThrowStatement: function (stmt, flags) {
            return [join(
                'throw',
                this.generateExpression(stmt.argument, Precedence.Sequence, E_TTT)
            ), this.semicolon(flags)];
        },

        TryStatement: function (stmt, flags) {
            var result, i, iz, guardedHandlers;

            result = ['try', this.maybeBlock(stmt.block, S_TFFF)];
            result = this.maybeBlockSuffix(stmt.block, result);

            if (stmt.handlers) {
                // old interface
                for (i = 0, iz = stmt.handlers.length; i < iz; ++i) {
                    result = join(result, this.generateStatement(stmt.handlers[i], S_TFFF));
                    if (stmt.finalizer || i + 1 !== iz) {
                        result = this.maybeBlockSuffix(stmt.handlers[i].body, result);
                    }
                }
            } else {
                guardedHandlers = stmt.guardedHandlers || [];

                for (i = 0, iz = guardedHandlers.length; i < iz; ++i) {
                    result = join(result, this.generateStatement(guardedHandlers[i], S_TFFF));
                    if (stmt.finalizer || i + 1 !== iz) {
                        result = this.maybeBlockSuffix(guardedHandlers[i].body, result);
                    }
                }

                // new interface
                if (stmt.handler) {
                    if (Array.isArray(stmt.handler)) {
                        for (i = 0, iz = stmt.handler.length; i < iz; ++i) {
                            result = join(result, this.generateStatement(stmt.handler[i], S_TFFF));
                            if (stmt.finalizer || i + 1 !== iz) {
                                result = this.maybeBlockSuffix(stmt.handler[i].body, result);
                            }
                        }
                    } else {
                        result = join(result, this.generateStatement(stmt.handler, S_TFFF));
                        if (stmt.finalizer) {
                            result = this.maybeBlockSuffix(stmt.handler.body, result);
                        }
                    }
                }
            }
            if (stmt.finalizer) {
                result = join(result, ['finally', this.maybeBlock(stmt.finalizer, S_TFFF)]);
            }
            return result;
        },

        SwitchStatement: function (stmt, flags) {
            var result, fragment, i, iz, bodyFlags, that = this;
            withIndent(function () {
                result = [
                    'switch' + space + '(',
                    that.generateExpression(stmt.discriminant, Precedence.Sequence, E_TTT),
                    ')' + space + '{' + newline
                ];
            });
            if (stmt.cases) {
                bodyFlags = S_TFFF;
                for (i = 0, iz = stmt.cases.length; i < iz; ++i) {
                    if (i === iz - 1) {
                        bodyFlags |= F_SEMICOLON_OPT;
                    }
                    fragment = addIndent(this.generateStatement(stmt.cases[i], bodyFlags));
                    result.push(fragment);
                    if (!endsWithLineTerminator(toSourceNodeWhenNeeded(fragment).toString())) {
                        result.push(newline);
                    }
                }
            }
            result.push(addIndent('}'));
            return result;
        },

        SwitchCase: function (stmt, flags) {
            var result, fragment, i, iz, bodyFlags, that = this;
            withIndent(function () {
                if (stmt.test) {
                    result = [
                        join('case', that.generateExpression(stmt.test, Precedence.Sequence, E_TTT)),
                        ':'
                    ];
                } else {
                    result = ['default:'];
                }

                i = 0;
                iz = stmt.consequent.length;
                if (iz && stmt.consequent[0].type === Syntax.BlockStatement) {
                    fragment = that.maybeBlock(stmt.consequent[0], S_TFFF);
                    result.push(fragment);
                    i = 1;
                }

                if (i !== iz && !endsWithLineTerminator(toSourceNodeWhenNeeded(result).toString())) {
                    result.push(newline);
                }

                bodyFlags = S_TFFF;
                for (; i < iz; ++i) {
                    if (i === iz - 1 && flags & F_SEMICOLON_OPT) {
                        bodyFlags |= F_SEMICOLON_OPT;
                    }
                    fragment = addIndent(that.generateStatement(stmt.consequent[i], bodyFlags));
                    result.push(fragment);
                    if (i + 1 !== iz && !endsWithLineTerminator(toSourceNodeWhenNeeded(fragment).toString())) {
                        result.push(newline);
                    }
                }
            });
            return result;
        },

        IfStatement: function (stmt, flags) {
            var result, bodyFlags, semicolonOptional, that = this;
            withIndent(function () {
                result = [
                    'if' + space + '(',
                    that.generateExpression(stmt.test, Precedence.Sequence, E_TTT),
                    ')'
                ];
            });
            semicolonOptional = flags & F_SEMICOLON_OPT;
            bodyFlags = S_TFFF;
            if (semicolonOptional) {
                bodyFlags |= F_SEMICOLON_OPT;
            }
            if (stmt.alternate) {
                result.push(this.maybeBlock(stmt.consequent, S_TFFF));
                result = this.maybeBlockSuffix(stmt.consequent, result);
                if (stmt.alternate.type === Syntax.IfStatement) {
                    result = join(result, ['else ', this.generateStatement(stmt.alternate, bodyFlags)]);
                } else {
                    result = join(result, join('else', this.maybeBlock(stmt.alternate, bodyFlags)));
                }
            } else {
                result.push(this.maybeBlock(stmt.consequent, bodyFlags));
            }
            return result;
        },

        ForStatement: function (stmt, flags) {
            var result, that = this;
            withIndent(function () {
                result = ['for' + space + '('];
                if (stmt.init) {
                    if (stmt.init.type === Syntax.VariableDeclaration) {
                        result.push(that.generateStatement(stmt.init, S_FFFF));
                    } else {
                        // F_ALLOW_IN becomes false.
                        result.push(that.generateExpression(stmt.init, Precedence.Sequence, E_FTT));
                        result.push(';');
                    }
                } else {
                    result.push(';');
                }

                if (stmt.test) {
                    result.push(space);
                    result.push(that.generateExpression(stmt.test, Precedence.Sequence, E_TTT));
                    result.push(';');
                } else {
                    result.push(';');
                }

                if (stmt.update) {
                    result.push(space);
                    result.push(that.generateExpression(stmt.update, Precedence.Sequence, E_TTT));
                    result.push(')');
                } else {
                    result.push(')');
                }
            });

            result.push(this.maybeBlock(stmt.body, flags & F_SEMICOLON_OPT ? S_TFFT : S_TFFF));
            return result;
        },

        ForInStatement: function (stmt, flags) {
            return this.generateIterationForStatement('in', stmt, flags & F_SEMICOLON_OPT ? S_TFFT : S_TFFF);
        },

        ForOfStatement: function (stmt, flags) {
            return this.generateIterationForStatement('of', stmt, flags & F_SEMICOLON_OPT ? S_TFFT : S_TFFF);
        },

        LabeledStatement: function (stmt, flags) {
            return [stmt.label.name + ':', this.maybeBlock(stmt.body, flags & F_SEMICOLON_OPT ? S_TFFT : S_TFFF)];
        },

        Program: function (stmt, flags) {
            var result, fragment, i, iz, bodyFlags;
            iz = stmt.body.length;
            result = [safeConcatenation && iz > 0 ? '\n' : ''];
            bodyFlags = S_TFTF;
            for (i = 0; i < iz; ++i) {
                if (!safeConcatenation && i === iz - 1) {
                    bodyFlags |= F_SEMICOLON_OPT;
                }

                if (preserveBlankLines) {
                    // handle spaces before the first line
                    if (i === 0) {
                        if (!stmt.body[0].leadingComments) {
                            generateBlankLines(stmt.range[0], stmt.body[i].range[0], result);
                        }
                    }

                    // handle spaces between lines
                    if (i > 0) {
                        if (!stmt.body[i - 1].trailingComments && !stmt.body[i].leadingComments) {
                            generateBlankLines(stmt.body[i - 1].range[1], stmt.body[i].range[0], result);
                        }
                    }
                }

                fragment = addIndent(this.generateStatement(stmt.body[i], bodyFlags));
                result.push(fragment);
                if (i + 1 < iz && !endsWithLineTerminator(toSourceNodeWhenNeeded(fragment).toString())) {
                    if (preserveBlankLines) {
                        if (!stmt.body[i + 1].leadingComments) {
                            result.push(newline);
                        }
                    } else {
                        result.push(newline);
                    }
                }

                if (preserveBlankLines) {
                    // handle spaces after the last line
                    if (i === iz - 1) {
                        if (!stmt.body[i].trailingComments) {
                            generateBlankLines(stmt.body[i].range[1], stmt.range[1], result);
                        }
                    }
                }
            }
            return result;
        },

        FunctionDeclaration: function (stmt, flags) {
            return [
                generateAsyncPrefix(stmt, true),
                'function',
                generateStarSuffix(stmt) || noEmptySpace(),
                stmt.id ? generateIdentifier(stmt.id) : '',
                this.generateFunctionBody(stmt)
            ];
        },

        ReturnStatement: function (stmt, flags) {
            if (stmt.argument) {
                return [join(
                    'return',
                    this.generateExpression(stmt.argument, Precedence.Sequence, E_TTT)
                ), this.semicolon(flags)];
            }
            return ['return' + this.semicolon(flags)];
        },

        WhileStatement: function (stmt, flags) {
            var result, that = this;
            withIndent(function () {
                result = [
                    'while' + space + '(',
                    that.generateExpression(stmt.test, Precedence.Sequence, E_TTT),
                    ')'
                ];
            });
            result.push(this.maybeBlock(stmt.body, flags & F_SEMICOLON_OPT ? S_TFFT : S_TFFF));
            return result;
        },

        WithStatement: function (stmt, flags) {
            var result, that = this;
            withIndent(function () {
                result = [
                    'with' + space + '(',
                    that.generateExpression(stmt.object, Precedence.Sequence, E_TTT),
                    ')'
                ];
            });
            result.push(this.maybeBlock(stmt.body, flags & F_SEMICOLON_OPT ? S_TFFT : S_TFFF));
            return result;
        }
    };

    merge(CodeGenerator.prototype, CodeGenerator.Statement);

    // Expressions.

    CodeGenerator.Expression = {

        SequenceExpression: function (expr, precedence, flags) {
            var result, i, iz;
            if (Precedence.Sequence < precedence) {
                flags |= F_ALLOW_IN;
            }
            result = [];
            for (i = 0, iz = expr.expressions.length; i < iz; ++i) {
                result.push(this.generateExpression(expr.expressions[i], Precedence.Assignment, flags));
                if (i + 1 < iz) {
                    result.push(',' + space);
                }
            }
            return parenthesize(result, Precedence.Sequence, precedence);
        },

        AssignmentExpression: function (expr, precedence, flags) {
            return this.generateAssignment(expr.left, expr.right, expr.operator, precedence, flags);
        },

        ArrowFunctionExpression: function (expr, precedence, flags) {
            return parenthesize(this.generateFunctionBody(expr), Precedence.ArrowFunction, precedence);
        },

        ConditionalExpression: function (expr, precedence, flags) {
            if (Precedence.Conditional < precedence) {
                flags |= F_ALLOW_IN;
            }
            return parenthesize(
                [
                    this.generateExpression(expr.test, Precedence.LogicalOR, flags),
                    space + '?' + space,
                    this.generateExpression(expr.consequent, Precedence.Assignment, flags),
                    space + ':' + space,
                    this.generateExpression(expr.alternate, Precedence.Assignment, flags)
                ],
                Precedence.Conditional,
                precedence
            );
        },

        LogicalExpression: function (expr, precedence, flags) {
            return this.BinaryExpression(expr, precedence, flags);
        },

        BinaryExpression: function (expr, precedence, flags) {
            var result, currentPrecedence, fragment, leftSource;
            currentPrecedence = BinaryPrecedence[expr.operator];

            if (currentPrecedence < precedence) {
                flags |= F_ALLOW_IN;
            }

            fragment = this.generateExpression(expr.left, currentPrecedence, flags);

            leftSource = fragment.toString();

            if (leftSource.charCodeAt(leftSource.length - 1) === 0x2F /* / */ && esutils.code.isIdentifierPartES5(expr.operator.charCodeAt(0))) {
                result = [fragment, noEmptySpace(), expr.operator];
            } else {
                result = join(fragment, expr.operator);
            }

            fragment = this.generateExpression(expr.right, currentPrecedence + 1, flags);

            if (expr.operator === '/' && fragment.toString().charAt(0) === '/' ||
            expr.operator.slice(-1) === '<' && fragment.toString().slice(0, 3) === '!--') {
                // If '/' concats with '/' or `<` concats with `!--`, it is interpreted as comment start
                result.push(noEmptySpace());
                result.push(fragment);
            } else {
                result = join(result, fragment);
            }

            if (expr.operator === 'in' && !(flags & F_ALLOW_IN)) {
                return ['(', result, ')'];
            }
            return parenthesize(result, currentPrecedence, precedence);
        },

        CallExpression: function (expr, precedence, flags) {
            var result, i, iz;
            // F_ALLOW_UNPARATH_NEW becomes false.
            result = [this.generateExpression(expr.callee, Precedence.Call, E_TTF)];
            result.push('(');
            for (i = 0, iz = expr['arguments'].length; i < iz; ++i) {
                result.push(this.generateExpression(expr['arguments'][i], Precedence.Assignment, E_TTT));
                if (i + 1 < iz) {
                    result.push(',' + space);
                }
            }
            result.push(')');

            if (!(flags & F_ALLOW_CALL)) {
                return ['(', result, ')'];
            }
            return parenthesize(result, Precedence.Call, precedence);
        },

        NewExpression: function (expr, precedence, flags) {
            var result, length, i, iz, itemFlags;
            length = expr['arguments'].length;

            // F_ALLOW_CALL becomes false.
            // F_ALLOW_UNPARATH_NEW may become false.
            itemFlags = (flags & F_ALLOW_UNPARATH_NEW && !parentheses && length === 0) ? E_TFT : E_TFF;

            result = join(
                'new',
                this.generateExpression(expr.callee, Precedence.New, itemFlags)
            );

            if (!(flags & F_ALLOW_UNPARATH_NEW) || parentheses || length > 0) {
                result.push('(');
                for (i = 0, iz = length; i < iz; ++i) {
                    result.push(this.generateExpression(expr['arguments'][i], Precedence.Assignment, E_TTT));
                    if (i + 1 < iz) {
                        result.push(',' + space);
                    }
                }
                result.push(')');
            }

            return parenthesize(result, Precedence.New, precedence);
        },

        MemberExpression: function (expr, precedence, flags) {
            var result, fragment;

            // F_ALLOW_UNPARATH_NEW becomes false.
            result = [this.generateExpression(expr.object, Precedence.Call, (flags & F_ALLOW_CALL) ? E_TTF : E_TFF)];

            if (expr.computed) {
                result.push('[');
                result.push(this.generateExpression(expr.property, Precedence.Sequence, flags & F_ALLOW_CALL ? E_TTT : E_TFT));
                result.push(']');
            } else {
                if (expr.object.type === Syntax.Literal && typeof expr.object.value === 'number') {
                    fragment = toSourceNodeWhenNeeded(result).toString();
                    // When the following conditions are all true,
                    //   1. No floating point
                    //   2. Don't have exponents
                    //   3. The last character is a decimal digit
                    //   4. Not hexadecimal OR octal number literal
                    // we should add a floating point.
                    if (
                            fragment.indexOf('.') < 0 &&
                            !/[eExX]/.test(fragment) &&
                            esutils.code.isDecimalDigit(fragment.charCodeAt(fragment.length - 1)) &&
                            !(fragment.length >= 2 && fragment.charCodeAt(0) === 48)  // '0'
                            ) {
                        result.push(' ');
                    }
                }
                result.push('.');
                result.push(generateIdentifier(expr.property));
            }

            return parenthesize(result, Precedence.Member, precedence);
        },

        MetaProperty: function (expr, precedence, flags) {
            var result;
            result = [];
            result.push(typeof expr.meta === "string" ? expr.meta : generateIdentifier(expr.meta));
            result.push('.');
            result.push(typeof expr.property === "string" ? expr.property : generateIdentifier(expr.property));
            return parenthesize(result, Precedence.Member, precedence);
        },

        UnaryExpression: function (expr, precedence, flags) {
            var result, fragment, rightCharCode, leftSource, leftCharCode;
            fragment = this.generateExpression(expr.argument, Precedence.Unary, E_TTT);

            if (space === '') {
                result = join(expr.operator, fragment);
            } else {
                result = [expr.operator];
                if (expr.operator.length > 2) {
                    // delete, void, typeof
                    // get `typeof []`, not `typeof[]`
                    result = join(result, fragment);
                } else {
                    // Prevent inserting spaces between operator and argument if it is unnecessary
                    // like, `!cond`
                    leftSource = toSourceNodeWhenNeeded(result).toString();
                    leftCharCode = leftSource.charCodeAt(leftSource.length - 1);
                    rightCharCode = fragment.toString().charCodeAt(0);

                    if (((leftCharCode === 0x2B  /* + */ || leftCharCode === 0x2D  /* - */) && leftCharCode === rightCharCode) ||
                            (esutils.code.isIdentifierPartES5(leftCharCode) && esutils.code.isIdentifierPartES5(rightCharCode))) {
                        result.push(noEmptySpace());
                        result.push(fragment);
                    } else {
                        result.push(fragment);
                    }
                }
            }
            return parenthesize(result, Precedence.Unary, precedence);
        },

        YieldExpression: function (expr, precedence, flags) {
            var result;
            if (expr.delegate) {
                result = 'yield*';
            } else {
                result = 'yield';
            }
            if (expr.argument) {
                result = join(
                    result,
                    this.generateExpression(expr.argument, Precedence.Yield, E_TTT)
                );
            }
            return parenthesize(result, Precedence.Yield, precedence);
        },

        AwaitExpression: function (expr, precedence, flags) {
            var result = join(
                expr.all ? 'await*' : 'await',
                this.generateExpression(expr.argument, Precedence.Await, E_TTT)
            );
            return parenthesize(result, Precedence.Await, precedence);
        },

        UpdateExpression: function (expr, precedence, flags) {
            if (expr.prefix) {
                return parenthesize(
                    [
                        expr.operator,
                        this.generateExpression(expr.argument, Precedence.Unary, E_TTT)
                    ],
                    Precedence.Unary,
                    precedence
                );
            }
            return parenthesize(
                [
                    this.generateExpression(expr.argument, Precedence.Postfix, E_TTT),
                    expr.operator
                ],
                Precedence.Postfix,
                precedence
            );
        },

        FunctionExpression: function (expr, precedence, flags) {
            var result = [
                generateAsyncPrefix(expr, true),
                'function'
            ];
            if (expr.id) {
                result.push(generateStarSuffix(expr) || noEmptySpace());
                result.push(generateIdentifier(expr.id));
            } else {
                result.push(generateStarSuffix(expr) || space);
            }
            result.push(this.generateFunctionBody(expr));
            return result;
        },

        ArrayPattern: function (expr, precedence, flags) {
            return this.ArrayExpression(expr, precedence, flags, true);
        },

        ArrayExpression: function (expr, precedence, flags, isPattern) {
            var result, multiline, that = this;
            if (!expr.elements.length) {
                return '[]';
            }
            multiline = isPattern ? false : expr.elements.length > 1;
            result = ['[', multiline ? newline : ''];
            withIndent(function (indent) {
                var i, iz;
                for (i = 0, iz = expr.elements.length; i < iz; ++i) {
                    if (!expr.elements[i]) {
                        if (multiline) {
                            result.push(indent);
                        }
                        if (i + 1 === iz) {
                            result.push(',');
                        }
                    } else {
                        result.push(multiline ? indent : '');
                        result.push(that.generateExpression(expr.elements[i], Precedence.Assignment, E_TTT));
                    }
                    if (i + 1 < iz) {
                        result.push(',' + (multiline ? newline : space));
                    }
                }
            });
            if (multiline && !endsWithLineTerminator(toSourceNodeWhenNeeded(result).toString())) {
                result.push(newline);
            }
            result.push(multiline ? base : '');
            result.push(']');
            return result;
        },

        RestElement: function(expr, precedence, flags) {
            return '...' + this.generatePattern(expr.argument);
        },

        ClassExpression: function (expr, precedence, flags) {
            var result, fragment;
            result = ['class'];
            if (expr.id) {
                result = join(result, this.generateExpression(expr.id, Precedence.Sequence, E_TTT));
            }
            if (expr.superClass) {
                fragment = join('extends', this.generateExpression(expr.superClass, Precedence.Assignment, E_TTT));
                result = join(result, fragment);
            }
            result.push(space);
            result.push(this.generateStatement(expr.body, S_TFFT));
            return result;
        },

        MethodDefinition: function (expr, precedence, flags) {
            var result, fragment;
            if (expr['static']) {
                result = ['static' + space];
            } else {
                result = [];
            }
            if (expr.kind === 'get' || expr.kind === 'set') {
                fragment = [
                    join(expr.kind, this.generatePropertyKey(expr.key, expr.computed)),
                    this.generateFunctionBody(expr.value)
                ];
            } else {
                fragment = [
                    generateMethodPrefix(expr),
                    this.generatePropertyKey(expr.key, expr.computed),
                    this.generateFunctionBody(expr.value)
                ];
            }
            return join(result, fragment);
        },

        Property: function (expr, precedence, flags) {
            if (expr.kind === 'get' || expr.kind === 'set') {
                return [
                    expr.kind, noEmptySpace(),
                    this.generatePropertyKey(expr.key, expr.computed),
                    this.generateFunctionBody(expr.value)
                ];
            }

            if (expr.shorthand) {
                if (expr.value.type === "AssignmentPattern") {
                    return this.AssignmentPattern(expr.value, Precedence.Sequence, E_TTT);
                }
                return this.generatePropertyKey(expr.key, expr.computed);
            }

            if (expr.method) {
                return [
                    generateMethodPrefix(expr),
                    this.generatePropertyKey(expr.key, expr.computed),
                    this.generateFunctionBody(expr.value)
                ];
            }

            return [
                this.generatePropertyKey(expr.key, expr.computed),
                ':' + space,
                this.generateExpression(expr.value, Precedence.Assignment, E_TTT)
            ];
        },

        ObjectExpression: function (expr, precedence, flags) {
            var multiline, result, fragment, that = this;

            if (!expr.properties.length) {
                return '{}';
            }
            multiline = expr.properties.length > 1;

            withIndent(function () {
                fragment = that.generateExpression(expr.properties[0], Precedence.Sequence, E_TTT);
            });

            if (!multiline) {
                // issues 4
                // Do not transform from
                //   dejavu.Class.declare({
                //       method2: function () {}
                //   });
                // to
                //   dejavu.Class.declare({method2: function () {
                //       }});
                if (!hasLineTerminator(toSourceNodeWhenNeeded(fragment).toString())) {
                    return [ '{', space, fragment, space, '}' ];
                }
            }

            withIndent(function (indent) {
                var i, iz;
                result = [ '{', newline, indent, fragment ];

                if (multiline) {
                    result.push(',' + newline);
                    for (i = 1, iz = expr.properties.length; i < iz; ++i) {
                        result.push(indent);
                        result.push(that.generateExpression(expr.properties[i], Precedence.Sequence, E_TTT));
                        if (i + 1 < iz) {
                            result.push(',' + newline);
                        }
                    }
                }
            });

            if (!endsWithLineTerminator(toSourceNodeWhenNeeded(result).toString())) {
                result.push(newline);
            }
            result.push(base);
            result.push('}');
            return result;
        },

        AssignmentPattern: function(expr, precedence, flags) {
            return this.generateAssignment(expr.left, expr.right, '=', precedence, flags);
        },

        ObjectPattern: function (expr, precedence, flags) {
            var result, i, iz, multiline, property, that = this;
            if (!expr.properties.length) {
                return '{}';
            }

            multiline = false;
            if (expr.properties.length === 1) {
                property = expr.properties[0];
                if (property.value.type !== Syntax.Identifier) {
                    multiline = true;
                }
            } else {
                for (i = 0, iz = expr.properties.length; i < iz; ++i) {
                    property = expr.properties[i];
                    if (!property.shorthand) {
                        multiline = true;
                        break;
                    }
                }
            }
            result = ['{', multiline ? newline : '' ];

            withIndent(function (indent) {
                var i, iz;
                for (i = 0, iz = expr.properties.length; i < iz; ++i) {
                    result.push(multiline ? indent : '');
                    result.push(that.generateExpression(expr.properties[i], Precedence.Sequence, E_TTT));
                    if (i + 1 < iz) {
                        result.push(',' + (multiline ? newline : space));
                    }
                }
            });

            if (multiline && !endsWithLineTerminator(toSourceNodeWhenNeeded(result).toString())) {
                result.push(newline);
            }
            result.push(multiline ? base : '');
            result.push('}');
            return result;
        },

        ThisExpression: function (expr, precedence, flags) {
            return 'this';
        },

        Super: function (expr, precedence, flags) {
            return 'super';
        },

        Identifier: function (expr, precedence, flags) {
            return generateIdentifier(expr);
        },

        ImportDefaultSpecifier: function (expr, precedence, flags) {
            return generateIdentifier(expr.id || expr.local);
        },

        ImportNamespaceSpecifier: function (expr, precedence, flags) {
            var result = ['*'];
            var id = expr.id || expr.local;
            if (id) {
                result.push(space + 'as' + noEmptySpace() + generateIdentifier(id));
            }
            return result;
        },

        ImportSpecifier: function (expr, precedence, flags) {
            var imported = expr.imported;
            var result = [ imported.name ];
            var local = expr.local;
            if (local && local.name !== imported.name) {
                result.push(noEmptySpace() + 'as' + noEmptySpace() + generateIdentifier(local));
            }
            return result;
        },

        ExportSpecifier: function (expr, precedence, flags) {
            var local = expr.local;
            var result = [ local.name ];
            var exported = expr.exported;
            if (exported && exported.name !== local.name) {
                result.push(noEmptySpace() + 'as' + noEmptySpace() + generateIdentifier(exported));
            }
            return result;
        },

        Literal: function (expr, precedence, flags) {
            var raw;
            if (expr.hasOwnProperty('raw') && parse && extra.raw) {
                try {
                    raw = parse(expr.raw).body[0].expression;
                    if (raw.type === Syntax.Literal) {
                        if (raw.value === expr.value) {
                            return expr.raw;
                        }
                    }
                } catch (e) {
                    // not use raw property
                }
            }

            if (expr.value === null) {
                return 'null';
            }

            if (typeof expr.value === 'string') {
                return escapeString(expr.value);
            }

            if (typeof expr.value === 'number') {
                return generateNumber(expr.value);
            }

            if (typeof expr.value === 'boolean') {
                return expr.value ? 'true' : 'false';
            }

            if (expr.regex) {
              return '/' + expr.regex.pattern + '/' + expr.regex.flags;
            }
            return generateRegExp(expr.value);
        },

        GeneratorExpression: function (expr, precedence, flags) {
            return this.ComprehensionExpression(expr, precedence, flags);
        },

        ComprehensionExpression: function (expr, precedence, flags) {
            // GeneratorExpression should be parenthesized with (...), ComprehensionExpression with [...]
            // Due to https://bugzilla.mozilla.org/show_bug.cgi?id=883468 position of expr.body can differ in Spidermonkey and ES6

            var result, i, iz, fragment, that = this;
            result = (expr.type === Syntax.GeneratorExpression) ? ['('] : ['['];

            if (extra.moz.comprehensionExpressionStartsWithAssignment) {
                fragment = this.generateExpression(expr.body, Precedence.Assignment, E_TTT);
                result.push(fragment);
            }

            if (expr.blocks) {
                withIndent(function () {
                    for (i = 0, iz = expr.blocks.length; i < iz; ++i) {
                        fragment = that.generateExpression(expr.blocks[i], Precedence.Sequence, E_TTT);
                        if (i > 0 || extra.moz.comprehensionExpressionStartsWithAssignment) {
                            result = join(result, fragment);
                        } else {
                            result.push(fragment);
                        }
                    }
                });
            }

            if (expr.filter) {
                result = join(result, 'if' + space);
                fragment = this.generateExpression(expr.filter, Precedence.Sequence, E_TTT);
                result = join(result, [ '(', fragment, ')' ]);
            }

            if (!extra.moz.comprehensionExpressionStartsWithAssignment) {
                fragment = this.generateExpression(expr.body, Precedence.Assignment, E_TTT);

                result = join(result, fragment);
            }

            result.push((expr.type === Syntax.GeneratorExpression) ? ')' : ']');
            return result;
        },

        ComprehensionBlock: function (expr, precedence, flags) {
            var fragment;
            if (expr.left.type === Syntax.VariableDeclaration) {
                fragment = [
                    expr.left.kind, noEmptySpace(),
                    this.generateStatement(expr.left.declarations[0], S_FFFF)
                ];
            } else {
                fragment = this.generateExpression(expr.left, Precedence.Call, E_TTT);
            }

            fragment = join(fragment, expr.of ? 'of' : 'in');
            fragment = join(fragment, this.generateExpression(expr.right, Precedence.Sequence, E_TTT));

            return [ 'for' + space + '(', fragment, ')' ];
        },

        SpreadElement: function (expr, precedence, flags) {
            return [
                '...',
                this.generateExpression(expr.argument, Precedence.Assignment, E_TTT)
            ];
        },

        TaggedTemplateExpression: function (expr, precedence, flags) {
            var itemFlags = E_TTF;
            if (!(flags & F_ALLOW_CALL)) {
                itemFlags = E_TFF;
            }
            var result = [
                this.generateExpression(expr.tag, Precedence.Call, itemFlags),
                this.generateExpression(expr.quasi, Precedence.Primary, E_FFT)
            ];
            return parenthesize(result, Precedence.TaggedTemplate, precedence);
        },

        TemplateElement: function (expr, precedence, flags) {
            // Don't use "cooked". Since tagged template can use raw template
            // representation. So if we do so, it breaks the script semantics.
            return expr.value.raw;
        },

        TemplateLiteral: function (expr, precedence, flags) {
            var result, i, iz;
            result = [ '`' ];
            for (i = 0, iz = expr.quasis.length; i < iz; ++i) {
                result.push(this.generateExpression(expr.quasis[i], Precedence.Primary, E_TTT));
                if (i + 1 < iz) {
                    result.push('${' + space);
                    result.push(this.generateExpression(expr.expressions[i], Precedence.Sequence, E_TTT));
                    result.push(space + '}');
                }
            }
            result.push('`');
            return result;
        },

        ModuleSpecifier: function (expr, precedence, flags) {
            return this.Literal(expr, precedence, flags);
        },

        ImportExpression: function(expr, precedence, flag) {
            return parenthesize([
                'import(',
                this.generateExpression(expr.source, Precedence.Assignment, E_TTT),
                ')'
            ], Precedence.Call, precedence);
        },
    };

    merge(CodeGenerator.prototype, CodeGenerator.Expression);

    CodeGenerator.prototype.generateExpression = function (expr, precedence, flags) {
        var result, type;

        type = expr.type || Syntax.Property;

        if (extra.verbatim && expr.hasOwnProperty(extra.verbatim)) {
            return generateVerbatim(expr, precedence);
        }

        result = this[type](expr, precedence, flags);


        if (extra.comment) {
            result = addComments(expr, result);
        }
        return toSourceNodeWhenNeeded(result, expr);
    };

    CodeGenerator.prototype.generateStatement = function (stmt, flags) {
        var result,
            fragment;

        result = this[stmt.type](stmt, flags);

        // Attach comments

        if (extra.comment) {
            result = addComments(stmt, result);
        }

        fragment = toSourceNodeWhenNeeded(result).toString();
        if (stmt.type === Syntax.Program && !safeConcatenation && newline === '' &&  fragment.charAt(fragment.length - 1) === '\n') {
            result = sourceMap ? toSourceNodeWhenNeeded(result).replaceRight(/\s+$/, '') : fragment.replace(/\s+$/, '');
        }

        return toSourceNodeWhenNeeded(result, stmt);
    };

    function generateInternal(node) {
        var codegen;

        codegen = new CodeGenerator();
        if (isStatement(node)) {
            return codegen.generateStatement(node, S_TFFF);
        }

        if (isExpression(node)) {
            return codegen.generateExpression(node, Precedence.Sequence, E_TTT);
        }

        throw new Error('Unknown node type: ' + node.type);
    }

    function generate(node, options) {
        var defaultOptions = getDefaultOptions(), result, pair;

        if (options != null) {
            // Obsolete options
            //
            //   `options.indent`
            //   `options.base`
            //
            // Instead of them, we can use `option.format.indent`.
            if (typeof options.indent === 'string') {
                defaultOptions.format.indent.style = options.indent;
            }
            if (typeof options.base === 'number') {
                defaultOptions.format.indent.base = options.base;
            }
            options = updateDeeply(defaultOptions, options);
            indent = options.format.indent.style;
            if (typeof options.base === 'string') {
                base = options.base;
            } else {
                base = stringRepeat(indent, options.format.indent.base);
            }
        } else {
            options = defaultOptions;
            indent = options.format.indent.style;
            base = stringRepeat(indent, options.format.indent.base);
        }
        json = options.format.json;
        renumber = options.format.renumber;
        hexadecimal = json ? false : options.format.hexadecimal;
        quotes = json ? 'double' : options.format.quotes;
        escapeless = options.format.escapeless;
        newline = options.format.newline;
        space = options.format.space;
        if (options.format.compact) {
            newline = space = indent = base = '';
        }
        parentheses = options.format.parentheses;
        semicolons = options.format.semicolons;
        safeConcatenation = options.format.safeConcatenation;
        directive = options.directive;
        parse = json ? null : options.parse;
        sourceMap = options.sourceMap;
        sourceCode = options.sourceCode;
        preserveBlankLines = options.format.preserveBlankLines && sourceCode !== null;
        extra = options;

        if (sourceMap) {
            if (!exports.browser) {
                // We assume environment is node.js
                // And prevent from including source-map by browserify
                // hack-istanbul - inline-require
                SourceNode = {};
            } else {
                SourceNode = global.sourceMap.SourceNode;
            }
        }

        result = generateInternal(node);

        if (!sourceMap) {
            pair = {code: result.toString(), map: null};
            return options.sourceMapWithCode ? pair : pair.code;
        }


        pair = result.toStringWithSourceMap({
            file: options.file,
            sourceRoot: options.sourceMapRoot
        });

        if (options.sourceContent) {
            pair.map.setSourceContent(options.sourceMap,
                                      options.sourceContent);
        }

        if (options.sourceMapWithCode) {
            return pair;
        }

        return pair.map.toString();
    }

    FORMAT_MINIFY = {
        indent: {
            style: '',
            base: 0
        },
        renumber: true,
        hexadecimal: true,
        quotes: 'auto',
        escapeless: true,
        compact: true,
        parentheses: false,
        semicolons: false
    };

    FORMAT_DEFAULTS = getDefaultOptions().format;

    // hack-istanbul - inline-require
    exports.version = {};
    exports.generate = generate;
    exports.attachComments = estraverse.attachComments;
    exports.Precedence = updateDeeply({}, Precedence);
    exports.browser = false;
    exports.FORMAT_MINIFY = FORMAT_MINIFY;
    exports.FORMAT_DEFAULTS = FORMAT_DEFAULTS;
}());
/* vim: set sw=4 ts=4 et tw=80 : */
// hack-istanbul - inline-require
}());


/*
repo https://github.com/gotwarlost/istanbul/tree/v0.4.5
committed 2016-08-21T19:53:22Z
*/


/*
file https://github.com/gotwarlost/istanbul/blob/v0.4.5/lib/instrumenter.js
*/
// hack-istanbul - inline-require
/* istanbul ignore next */
(function () { let module, window; module = undefined; window = local;
/*
 Copyright (c) 2012, Yahoo! Inc.  All rights reserved.
 Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
 */

/*global esprima, escodegen, window */
(function (isNode) {
    "use strict";
    var SYNTAX,
        nodeType,
        ESP = isNode ? require('esprima') : esprima,
        ESPGEN = isNode ? require('escodegen') : escodegen,  //TODO - package as dependency
        crypto = isNode ? require('crypto') : null,
        LEADER_WRAP = '(function () { ',
        TRAILER_WRAP = '\n}());',
        COMMENT_RE = /^\s*istanbul\s+ignore\s+(if|else|next)(?=\W|$)/,
        astgen,
        preconditions,
        cond,
        isArray = Array.isArray;

    /* istanbul ignore if: untestable */
    if (!isArray) {
        isArray = function (thing) { return thing &&  Object.prototype.toString.call(thing) === '[object Array]'; };
    }

    if (!isNode) {
        preconditions = {
            'Could not find esprima': ESP,
            'Could not find escodegen': ESPGEN,
            'JSON object not in scope': JSON,
            'Array does not implement push': [].push,
            'Array does not implement unshift': [].unshift
        };
        /* istanbul ignore next: untestable */
        for (cond in preconditions) {
            if (preconditions.hasOwnProperty(cond)) {
                if (!preconditions[cond]) { throw new Error(cond); }
            }
        }
    }

    function generateTrackerVar(filename, omitSuffix) {
        var hash, suffix;
        if (crypto !== null) {
            hash = crypto.createHash('md5');
            hash.update(filename);
            suffix = hash.digest('base64');
            //trim trailing equal signs, turn identifier unsafe chars to safe ones + => _ and / => $
            suffix = suffix.replace(new RegExp('=', 'g'), '')
                .replace(new RegExp('\\+', 'g'), '_')
                .replace(new RegExp('/', 'g'), '$');
        } else {
            window.__cov_seq = window.__cov_seq || 0;
            window.__cov_seq += 1;
            suffix = window.__cov_seq;
        }
        // hack-istanbul - random coverage-identifier
        return '__cov_' + Math.random().toString(16).slice(2);
    }

    function pushAll(ary, thing) {
        if (!isArray(thing)) {
            thing = [ thing ];
        }
        Array.prototype.push.apply(ary, thing);
    }

    SYNTAX = {
        // keep in sync with estraverse's VisitorKeys
        AssignmentExpression: ['left', 'right'],
        AssignmentPattern: ['left', 'right'],
        ArrayExpression: ['elements'],
        ArrayPattern: ['elements'],
        ArrowFunctionExpression: ['params', 'body'],
        AwaitExpression: ['argument'], // CAUTION: It's deferred to ES7.
        BlockStatement: ['body'],
        BinaryExpression: ['left', 'right'],
        BreakStatement: ['label'],
        CallExpression: ['callee', 'arguments'],
        CatchClause: ['param', 'body'],
        ClassBody: ['body'],
        ClassDeclaration: ['id', 'superClass', 'body'],
        ClassExpression: ['id', 'superClass', 'body'],
        ComprehensionBlock: ['left', 'right'],  // CAUTION: It's deferred to ES7.
        ComprehensionExpression: ['blocks', 'filter', 'body'],  // CAUTION: It's deferred to ES7.
        ConditionalExpression: ['test', 'consequent', 'alternate'],
        ContinueStatement: ['label'],
        DebuggerStatement: [],
        DirectiveStatement: [],
        DoWhileStatement: ['body', 'test'],
        EmptyStatement: [],
        ExportAllDeclaration: ['source'],
        ExportDefaultDeclaration: ['declaration'],
        ExportNamedDeclaration: ['declaration', 'specifiers', 'source'],
        ExportSpecifier: ['exported', 'local'],
        ExpressionStatement: ['expression'],
        ForStatement: ['init', 'test', 'update', 'body'],
        ForInStatement: ['left', 'right', 'body'],
        ForOfStatement: ['left', 'right', 'body'],
        FunctionDeclaration: ['id', 'params', 'body'],
        FunctionExpression: ['id', 'params', 'body'],
        GeneratorExpression: ['blocks', 'filter', 'body'],  // CAUTION: It's deferred to ES7.
        Identifier: [],
        IfStatement: ['test', 'consequent', 'alternate'],
        ImportDeclaration: ['specifiers', 'source'],
        ImportDefaultSpecifier: ['local'],
        ImportNamespaceSpecifier: ['local'],
        ImportSpecifier: ['imported', 'local'],
        Literal: [],
        LabeledStatement: ['label', 'body'],
        LogicalExpression: ['left', 'right'],
        MetaProperty: ['meta', 'property'],
        MemberExpression: ['object', 'property'],
        MethodDefinition: ['key', 'value'],
        ModuleSpecifier: [],
        NewExpression: ['callee', 'arguments'],
        ObjectExpression: ['properties'],
        ObjectPattern: ['properties'],
        Program: ['body'],
        Property: ['key', 'value'],
        RestElement: [ 'argument' ],
        ReturnStatement: ['argument'],
        SequenceExpression: ['expressions'],
        SpreadElement: ['argument'],
        Super: [],
        SwitchStatement: ['discriminant', 'cases'],
        SwitchCase: ['test', 'consequent'],
        TaggedTemplateExpression: ['tag', 'quasi'],
        TemplateElement: [],
        TemplateLiteral: ['quasis', 'expressions'],
        ThisExpression: [],
        ThrowStatement: ['argument'],
        TryStatement: ['block', 'handler', 'finalizer'],
        UnaryExpression: ['argument'],
        UpdateExpression: ['argument'],
        VariableDeclaration: ['declarations'],
        VariableDeclarator: ['id', 'init'],
        WhileStatement: ['test', 'body'],
        WithStatement: ['object', 'body'],
        YieldExpression: ['argument']
    };

    for (nodeType in SYNTAX) {
        /* istanbul ignore else: has own property */
        if (SYNTAX.hasOwnProperty(nodeType)) {
            SYNTAX[nodeType] = { name: nodeType, children: SYNTAX[nodeType] };
        }
    }

    astgen = {
        variable: function (name) { return { type: SYNTAX.Identifier.name, name: name }; },
        stringLiteral: function (str) { return { type: SYNTAX.Literal.name, value: String(str) }; },
        numericLiteral: function (num) { return { type: SYNTAX.Literal.name, value: Number(num) }; },
        statement: function (contents) { return { type: SYNTAX.ExpressionStatement.name, expression: contents }; },
        dot: function (obj, field) { return { type: SYNTAX.MemberExpression.name, computed: false, object: obj, property: field }; },
        subscript: function (obj, sub) { return { type: SYNTAX.MemberExpression.name, computed: true, object: obj, property: sub }; },
        postIncrement: function (obj) { return { type: SYNTAX.UpdateExpression.name, operator: '++', prefix: false, argument: obj }; },
        sequence: function (one, two) { return { type: SYNTAX.SequenceExpression.name, expressions: [one, two] }; },
        returnStatement: function (expr) { return { type: SYNTAX.ReturnStatement.name, argument: expr }; }
    };

    function Walker(walkMap, preprocessor, scope, debug) {
        this.walkMap = walkMap;
        this.preprocessor = preprocessor;
        this.scope = scope;
        this.debug = debug;
        if (this.debug) {
            this.level = 0;
            this.seq = true;
        }
    }

    function defaultWalker(node, walker) {

        var type = node.type,
            preprocessor,
            postprocessor,
            children = SYNTAX[type],
            // don't run generated nodes thru custom walks otherwise we will attempt to instrument the instrumentation code :)
            applyCustomWalker = !!node.loc || node.type === SYNTAX.Program.name,
            walkerFn = applyCustomWalker ? walker.walkMap[type] : null,
            i,
            j,
            walkFnIndex,
            childType,
            childNode,
            ret,
            childArray,
            childElement,
            pathElement,
            assignNode,
            isLast;

        if (!SYNTAX[type]) {
            console.error(node);
            console.error('Unsupported node type:' + type);
            return;
        }
        children = SYNTAX[type].children;
        /* istanbul ignore if: guard */
        if (node.walking) { throw new Error('Infinite regress: Custom walkers may NOT call walker.apply(node)'); }
        node.walking = true;

        ret = walker.apply(node, walker.preprocessor);

        preprocessor = ret.preprocessor;
        if (preprocessor) {
            delete ret.preprocessor;
            ret = walker.apply(node, preprocessor);
        }

        if (isArray(walkerFn)) {
            for (walkFnIndex = 0; walkFnIndex < walkerFn.length; walkFnIndex += 1) {
                isLast = walkFnIndex === walkerFn.length - 1;
                ret = walker.apply(ret, walkerFn[walkFnIndex]);
                /*istanbul ignore next: paranoid check */
                if (ret.type !== type && !isLast) {
                    throw new Error('Only the last walker is allowed to change the node type: [type was: ' + type + ' ]');
                }
            }
        } else {
            if (walkerFn) {
                ret = walker.apply(node, walkerFn);
            }
        }

        if (node.skipSelf) {
            return;
        }

        for (i = 0; i < children.length; i += 1) {
            childType = children[i];
            childNode = node[childType];
            if (childNode && !childNode.skipWalk) {
                pathElement = { node: node, property: childType };
                if (isArray(childNode)) {
                    childArray = [];
                    for (j = 0; j < childNode.length; j += 1) {
                        childElement = childNode[j];
                        pathElement.index = j;
                        if (childElement) {
                          assignNode = walker.apply(childElement, null, pathElement);
                          if (isArray(assignNode.prepend)) {
                              pushAll(childArray, assignNode.prepend);
                              delete assignNode.prepend;
                          }
                        } else {
                            assignNode = undefined;
                        }
                        pushAll(childArray, assignNode);
                    }
                    node[childType] = childArray;
                } else {
                    assignNode = walker.apply(childNode, null, pathElement);
                    /*istanbul ignore if: paranoid check */
                    if (isArray(assignNode.prepend)) {
                        throw new Error('Internal error: attempt to prepend statements in disallowed (non-array) context');
                        /* if this should be allowed, this is how to solve it
                        tmpNode = { type: 'BlockStatement', body: [] };
                        pushAll(tmpNode.body, assignNode.prepend);
                        pushAll(tmpNode.body, assignNode);
                        node[childType] = tmpNode;
                        delete assignNode.prepend;
                        */
                    } else {
                        node[childType] = assignNode;
                    }
                }
            }
        }

        postprocessor = ret.postprocessor;
        if (postprocessor) {
            delete ret.postprocessor;
            ret = walker.apply(ret, postprocessor);
        }

        delete node.walking;

        return ret;
    }

    Walker.prototype = {
        startWalk: function (node) {
            this.path = [];
            this.apply(node);
        },

        apply: function (node, walkFn, pathElement) {
            var ret, i, seq, prefix;

            walkFn = walkFn || defaultWalker;
            if (this.debug) {
                this.seq += 1;
                this.level += 1;
                seq = this.seq;
                prefix = '';
                for (i = 0; i < this.level; i += 1) { prefix += '    '; }
                console.log(prefix + 'Enter (' + seq + '):' + node.type);
            }
            if (pathElement) { this.path.push(pathElement); }
            ret = walkFn.call(this.scope, node, this);
            if (pathElement) { this.path.pop(); }
            if (this.debug) {
                this.level -= 1;
                console.log(prefix + 'Return (' + seq + '):' + node.type);
            }
            return ret || node;
        },

        startLineForNode: function (node) {
            return node && node.loc && node.loc.start ? node.loc.start.line : /* istanbul ignore next: guard */ null;
        },

        ancestor: function (n) {
            return this.path.length > n - 1 ? this.path[this.path.length - n] : /* istanbul ignore next: guard */ null;
        },

        parent: function () {
            return this.ancestor(1);
        },

        isLabeled: function () {
            var el = this.parent();
            return el && el.node.type === SYNTAX.LabeledStatement.name;
        }
    };

    /**
     * mechanism to instrument code for coverage. It uses the `esprima` and
     * `escodegen` libraries for JS parsing and code generation respectively.
     *
     * Works on `node` as well as the browser.
     *
     * Usage on nodejs
     * ---------------
     *
     *      var instrumenter = new require('istanbul').Instrumenter(),
     *          changed = instrumenter.instrumentSync('function meaningOfLife() { return 42; }', 'filename.js');
     *
     * Usage in a browser
     * ------------------
     *
     * Load `esprima.js`, `escodegen.js` and `instrumenter.js` (this file) using `script` tags or other means.
     *
     * Create an instrumenter object as:
     *
     *      var instrumenter = new Instrumenter(),
     *          changed = instrumenter.instrumentSync('function meaningOfLife() { return 42; }', 'filename.js');
     *
     * Aside from demonstration purposes, it is unclear why you would want to instrument code in a browser.
     *
     * @class Instrumenter
     * @constructor
     * @param {Object} options Optional. Configuration options.
     * @param {String} [options.coverageVariable] the global variable name to use for
     *      tracking coverage. Defaults to `__coverage__`
     * @param {Boolean} [options.embedSource] whether to embed the source code of every
     *      file as an array in the file coverage object for that file. Defaults to `false`
     * @param {Boolean} [options.preserveComments] whether comments should be preserved in the output. Defaults to `false`
     * @param {Boolean} [options.noCompact] emit readable code when set. Defaults to `false`
     * @param {Boolean} [options.esModules] whether the code to instrument contains uses es
     *      imports or exports.
     * @param {Boolean} [options.noAutoWrap] do not automatically wrap the source in
     *      an anonymous function before covering it. By default, code is wrapped in
     *      an anonymous function before it is parsed. This is done because
     *      some nodejs libraries have `return` statements outside of
     *      a function which is technically invalid Javascript and causes the parser to fail.
     *      This construct, however, works correctly in node since module loading
     *      is done in the context of an anonymous function.
     *
     * Note that the semantics of the code *returned* by the instrumenter does not change in any way.
     * The function wrapper is "unwrapped" before the instrumented code is generated.
     * @param {Object} [options.codeGenerationOptions] an object that is directly passed to the `escodegen`
     *      library as configuration for code generation. The `noCompact` setting is not honored when this
     *      option is specified
     * @param {Boolean} [options.debug] assist in debugging. Currently, the only effect of
     *      setting this option is a pretty-print of the coverage variable. Defaults to `false`
     * @param {Boolean} [options.walkDebug] assist in debugging of the AST walker used by this class.
     *
     */
    function Instrumenter(options) {
        this.opts = options || {
            debug: false,
            walkDebug: false,
            coverageVariable: '__coverage__',
            codeGenerationOptions: undefined,
            noAutoWrap: false,
            noCompact: false,
            embedSource: false,
            preserveComments: false,
            esModules: false
        };

        if (this.opts.esModules && !this.opts.noAutoWrap) {
            this.opts.noAutoWrap = true;
            if (this.opts.debug) {
                console.log('Setting noAutoWrap to true as required by esModules');
            }
        }

        this.walker = new Walker({
            ArrowFunctionExpression: [ this.arrowBlockConverter ],
            ExpressionStatement: this.coverStatement,
            ExportNamedDeclaration: this.coverExport,
            BreakStatement: this.coverStatement,
            ContinueStatement: this.coverStatement,
            DebuggerStatement: this.coverStatement,
            ReturnStatement: this.coverStatement,
            ThrowStatement: this.coverStatement,
            TryStatement: [ this.paranoidHandlerCheck, this.coverStatement],
            VariableDeclaration: this.coverStatement,
            IfStatement: [ this.ifBlockConverter, this.coverStatement, this.ifBranchInjector ],
            ForStatement: [ this.skipInit, this.loopBlockConverter, this.coverStatement ],
            ForInStatement: [ this.skipLeft, this.loopBlockConverter, this.coverStatement ],
            ForOfStatement: [ this.skipLeft, this.loopBlockConverter, this.coverStatement ],
            WhileStatement: [ this.loopBlockConverter, this.coverStatement ],
            DoWhileStatement: [ this.loopBlockConverter, this.coverStatement ],
            SwitchStatement: [ this.coverStatement, this.switchBranchInjector ],
            SwitchCase: [ this.switchCaseInjector ],
            WithStatement: [ this.withBlockConverter, this.coverStatement ],
            FunctionDeclaration: [ this.coverFunction, this.coverStatement ],
            FunctionExpression: this.coverFunction,
            LabeledStatement: this.coverStatement,
            ConditionalExpression: this.conditionalBranchInjector,
            LogicalExpression: this.logicalExpressionBranchInjector,
            ObjectExpression: this.maybeAddType,
            MetaProperty: this.coverMetaProperty,
        }, this.extractCurrentHint, this, this.opts.walkDebug);

        //unit testing purposes only
        if (this.opts.backdoor && this.opts.backdoor.omitTrackerSuffix) {
            this.omitTrackerSuffix = true;
        }
    }

    Instrumenter.prototype = {
        /**
         * synchronous instrumentation method. Throws when illegal code is passed to it
         * @method instrumentSync
         * @param {String} code the code to be instrumented as a String
         * @param {String} filename Optional. The name of the file from which
         *  the code was read. A temporary filename is generated when not specified.
         *  Not specifying a filename is only useful for unit tests and demonstrations
         *  of this library.
         */
        instrumentSync: function (code, filename) {
            var program;

            //protect from users accidentally passing in a Buffer object instead
            if (typeof code !== 'string') { throw new Error('Code must be string'); }
            if (code.charAt(0) === '#') { //shebang, 'comment' it out, won't affect syntax tree locations for things we care about
                code = '//' + code;
            }
            if (!this.opts.noAutoWrap) {
                code = LEADER_WRAP + code + TRAILER_WRAP;
            }
            try {
                // hack-istanbul - inline acorn-opt
                let opt = {
                    locations: true,
                    onComment: [],
                    onToken: this.opts.preserveComments,
                    ranges: true,
                    sourceType: this.opts.esModules ? 'module' : 'script'
                };
                program = ESP.parse(code, opt);
                program.comments = opt.onComment
            } catch (e) {
                console.log('Failed to parse file: ' + filename);
                throw e;
            }
            if (this.opts.preserveComments) {
                program = ESPGEN.attachComments(program, program.comments, program.tokens);
            }
            if (!this.opts.noAutoWrap) {
                program = {
                    type: SYNTAX.Program.name,
                    body: program.body[0].expression.callee.body.body,
                    comments: program.comments
                };
            }
            return this.instrumentASTSync(program, filename, code);
        },
        filterHints: function (comments) {
            var ret = [],
                i,
                comment,
                groups;
            if (!(comments && isArray(comments))) {
                return ret;
            }
            for (i = 0; i < comments.length; i += 1) {
                comment = comments[i];
                /* istanbul ignore else: paranoid check */
                if (comment && comment.value && comment.range && isArray(comment.range)) {
                    groups = String(comment.value).match(COMMENT_RE);
                    if (groups) {
                        ret.push({ type: groups[1], start: comment.range[0], end: comment.range[1] });
                    }
                }
            }
            return ret;
        },
        extractCurrentHint: function (node) {
            if (!node.range) { return; }
            var i = this.currentState.lastHintPosition + 1,
                hints = this.currentState.hints,
                nodeStart = node.range[0],
                hint;
            this.currentState.currentHint = null;
            // hack-istanbul - allow top-level istanbul-ignore-next
            if (node.type === "Program") { return; }
            while (i < hints.length) {
                hint = hints[i];
                if (hint.end < nodeStart) {
                    this.currentState.currentHint = hint;
                    this.currentState.lastHintPosition = i;
                    i += 1;
                } else {
                    break;
                }
            }
        },
        /**
         * synchronous instrumentation method that instruments an AST instead.
         * @method instrumentASTSync
         * @param {String} program the AST to be instrumented
         * @param {String} filename Optional. The name of the file from which
         *  the code was read. A temporary filename is generated when not specified.
         *  Not specifying a filename is only useful for unit tests and demonstrations
         *  of this library.
         *  @param {String} originalCode the original code corresponding to the AST,
         *  used for embedding the source into the coverage object
         */
        instrumentASTSync: function (program, filename, originalCode) {
            var usingStrict = false,
                codegenOptions,
                generated,
                preamble,
                lineCount,
                i;
            filename = filename || String(new Date().getTime()) + '.js';
            this.sourceMap = null;
            this.coverState = {
                path: filename,
                s: {},
                b: {},
                f: {},
                fnMap: {},
                statementMap: {},
                branchMap: {}
            };
            this.currentState = {
                trackerVar: generateTrackerVar(filename, this.omitTrackerSuffix),
                func: 0,
                branch: 0,
                variable: 0,
                statement: 0,
                hints: this.filterHints(program.comments),
                currentHint: null,
                lastHintPosition: -1,
                ignoring: 0
            };
            if (program.body && program.body.length > 0 && this.isUseStrictExpression(program.body[0])) {
                //nuke it
                program.body.shift();
                //and add it back at code generation time
                usingStrict = true;
            }
            this.walker.startWalk(program);
            codegenOptions = this.opts.codeGenerationOptions || { format: { compact: !this.opts.noCompact }};
            codegenOptions.comment = this.opts.preserveComments;
            //console.log(JSON.stringify(program, undefined, 2));

            generated = ESPGEN.generate(program, codegenOptions);
            preamble = this.getPreamble(originalCode || '', usingStrict);

            if (generated.map && generated.code) {
                lineCount = preamble.split(/\r\n|\r|\n/).length;
                // offset all the generated line numbers by the number of lines in the preamble
                for (i = 0; i < generated.map._mappings._array.length; i += 1) {
                    generated.map._mappings._array[i].generatedLine += lineCount;
                }
                this.sourceMap = generated.map;
                generated = generated.code;
            }

            return preamble + '\n' + generated + '\n';
        },
        /**
         * Callback based instrumentation. Note that this still executes synchronously in the same process tick
         * and calls back immediately. It only provides the options for callback style error handling as
         * opposed to a `try-catch` style and nothing more. Implemented as a wrapper over `instrumentSync`
         *
         * @method instrument
         * @param {String} code the code to be instrumented as a String
         * @param {String} filename Optional. The name of the file from which
         *  the code was read. A temporary filename is generated when not specified.
         *  Not specifying a filename is only useful for unit tests and demonstrations
         *  of this library.
         * @param {Function(err, instrumentedCode)} callback - the callback function
         */
        instrument: function (code, filename, callback) {

            if (!callback && typeof filename === 'function') {
                callback = filename;
                filename = null;
            }
            try {
                callback(null, this.instrumentSync(code, filename));
            } catch (ex) {
                callback(ex);
            }
        },
        /**
         * returns the file coverage object for the code that was instrumented
         * just before calling this method. Note that this represents a
         * "zero-coverage" object which is not even representative of the code
         * being loaded in node or a browser (which would increase the statement
         * counts for mainline code).
         * @method lastFileCoverage
         * @return {Object} a "zero-coverage" file coverage object for the code last instrumented
         * by this instrumenter
         */
        lastFileCoverage: function () {
            return this.coverState;
        },
        /**
         * returns the source map object for the code that was instrumented
         * just before calling this method.
         * @method lastSourceMap
         * @return {Object} a source map object for the code last instrumented
         * by this instrumenter
         */
        lastSourceMap: function () {
            return this.sourceMap;
        },
        fixColumnPositions: function (coverState) {
            var offset = LEADER_WRAP.length,
                fixer = function (loc) {
                    if (loc.start.line === 1) {
                        loc.start.column -= offset;
                    }
                    if (loc.end.line === 1) {
                        loc.end.column -= offset;
                    }
                },
                k,
                obj,
                i,
                locations;

            obj = coverState.statementMap;
            for (k in obj) {
                /* istanbul ignore else: has own property */
                if (obj.hasOwnProperty(k)) { fixer(obj[k]); }
            }
            obj = coverState.fnMap;
            for (k in obj) {
                /* istanbul ignore else: has own property */
                if (obj.hasOwnProperty(k)) { fixer(obj[k].loc); }
            }
            obj = coverState.branchMap;
            for (k in obj) {
                /* istanbul ignore else: has own property */
                if (obj.hasOwnProperty(k)) {
                    locations = obj[k].locations;
                    for (i = 0; i < locations.length; i += 1) {
                        fixer(locations[i]);
                    }
                }
            }
        },

        getPreamble: function (sourceCode, emitUseStrict) {
            var varName = this.opts.coverageVariable || '__coverage__',
                file = this.coverState.path.replace(/\\/g, '\\\\'),
                tracker = this.currentState.trackerVar,
                coverState,
                strictLine = emitUseStrict ? '"use strict";' : '',
                // return replacements using the function to ensure that the replacement is
                // treated like a dumb string and not as a string with RE replacement patterns
                replacer = function (s) {
                    return function () { return s; };
                },
                code;
            if (!this.opts.noAutoWrap) {
                this.fixColumnPositions(this.coverState);
            }
            if (this.opts.embedSource) {
                this.coverState.code = sourceCode.split(/(?:\r?\n)|\r/);
            }
            coverState = this.opts.debug ? JSON.stringify(this.coverState, undefined, 4) : JSON.stringify(this.coverState);
            code = [
                "%STRICT%",
                "var %VAR% = (Function('return this'))();",
                "if (!%VAR%.%GLOBAL%) { %VAR%.%GLOBAL% = {}; }",
                "%VAR% = %VAR%.%GLOBAL%;",
                "if (!(%VAR%['%FILE%'])) {",
                "   %VAR%['%FILE%'] = %OBJECT%;",
                "}",
                "%VAR% = %VAR%['%FILE%'];"
            ].join("\n")
                .replace(/%STRICT%/g, replacer(strictLine))
                .replace(/%VAR%/g, replacer(tracker))
                .replace(/%GLOBAL%/g, replacer(varName))
                .replace(/%FILE%/g, replacer(file))
                .replace(/%OBJECT%/g, replacer(coverState));
            return code;
        },

        startIgnore: function () {
            this.currentState.ignoring += 1;
        },

        endIgnore: function () {
            this.currentState.ignoring -= 1;
        },

        convertToBlock: function (node) {
            if (!node) {
                return { type: 'BlockStatement', body: [] };
            } else if (node.type === 'BlockStatement') {
                return node;
            } else {
                return { type: 'BlockStatement', body: [ node ] };
            }
        },

        arrowBlockConverter: function (node) {
            var retStatement;
            if (node.expression) { // turn expression nodes into a block with a return statement
                retStatement = astgen.returnStatement(node.body);
                // ensure the generated return statement is covered
                retStatement.loc = node.body.loc;
                node.body = this.convertToBlock(retStatement);
                node.expression = false;
            }
        },

        paranoidHandlerCheck: function (node) {
            // if someone is using an older esprima on the browser
            // convert handlers array to single handler attribute
            // containing its first element
            /* istanbul ignore next */
            if (!node.handler && node.handlers) {
                node.handler = node.handlers[0];
            }
        },

        ifBlockConverter: function (node) {
            node.consequent = this.convertToBlock(node.consequent);
            node.alternate = this.convertToBlock(node.alternate);
        },

        loopBlockConverter: function (node) {
            node.body = this.convertToBlock(node.body);
        },

        withBlockConverter: function (node) {
            node.body = this.convertToBlock(node.body);
        },

        statementName: function (location, initValue) {
            var sName,
                ignoring = !!this.currentState.ignoring;

            location.skip = ignoring || undefined;
            initValue = initValue || 0;
            this.currentState.statement += 1;
            sName = this.currentState.statement;
            this.coverState.statementMap[sName] = location;
            this.coverState.s[sName] = initValue;
            return sName;
        },

        skipInit: function (node /*, walker */) {
            if (node.init) {
                node.init.skipWalk = true;
            }
        },

        skipLeft: function (node /*, walker */) {
            node.left.skipWalk = true;
        },

        isUseStrictExpression: function (node) {
            return node && node.type === SYNTAX.ExpressionStatement.name &&
                node.expression  && node.expression.type === SYNTAX.Literal.name &&
                node.expression.value === 'use strict';
        },

        maybeSkipNode: function (node, type) {
            var alreadyIgnoring = !!this.currentState.ignoring,
                hint = this.currentState.currentHint,
                ignoreThis = !alreadyIgnoring && hint && hint.type === type;

            if (ignoreThis) {
                this.startIgnore();
                node.postprocessor = this.endIgnore;
                return true;
            }
            return false;
        },

        coverMetaProperty: function(node /* , walker */) {
           node.skipSelf = true;
        },

        coverStatement: function (node, walker) {
            var sName,
                incrStatementCount,
                parent,
                grandParent;

            this.maybeSkipNode(node, 'next');

            if (this.isUseStrictExpression(node)) {
                grandParent = walker.ancestor(2);
                /* istanbul ignore else: difficult to test */
                if (grandParent) {
                    if ((grandParent.node.type === SYNTAX.FunctionExpression.name ||
                        grandParent.node.type === SYNTAX.FunctionDeclaration.name)  &&
                        walker.parent().node.body[0] === node) {
                        return;
                    }
                }
            }

            if (node.type === SYNTAX.FunctionDeclaration.name) {
                // Called for the side-effect of setting the function's statement count to 1.
                this.statementName(node.loc, 1);
            } else {
                // We let `coverExport` handle ExportNamedDeclarations.
                parent = walker.parent();
                if (parent && parent.node.type === SYNTAX.ExportNamedDeclaration.name) {
                    return;
                }

                sName = this.statementName(node.loc);

                incrStatementCount = astgen.statement(
                    astgen.postIncrement(
                        astgen.subscript(
                            astgen.dot(astgen.variable(this.currentState.trackerVar), astgen.variable('s')),
                            astgen.stringLiteral(sName)
                        )
                    )
                );

                this.splice(incrStatementCount, node, walker);
            }
        },

        coverExport: function (node, walker) {
            var sName, incrStatementCount;

            if ( !node.declaration || !node.declaration.declarations ) { return; }

            this.maybeSkipNode(node, 'next');

            sName = this.statementName(node.declaration.loc);
            incrStatementCount = astgen.statement(
                astgen.postIncrement(
                    astgen.subscript(
                        astgen.dot(astgen.variable(this.currentState.trackerVar), astgen.variable('s')),
                        astgen.stringLiteral(sName)
                    )
                )
            );

            this.splice(incrStatementCount, node, walker);
        },

        splice: function (statements, node, walker) {
            var targetNode = walker.isLabeled() ? walker.parent().node : node;
            targetNode.prepend = targetNode.prepend || [];
            pushAll(targetNode.prepend, statements);
        },

        functionName: function (node, line, location) {
            this.currentState.func += 1;
            var id = this.currentState.func,
                ignoring = !!this.currentState.ignoring,
                name = node.id ? node.id.name : '(anonymous_' + id + ')',
                clone = function (attr) {
                    var obj = location[attr] || /* istanbul ignore next */ {};
                    return { line: obj.line, column: obj.column };
                };
            this.coverState.fnMap[id] = {
                name: name, line: line,
                loc: {
                    start: clone('start'),
                    end: clone('end')
                },
                skip: ignoring || undefined
            };
            this.coverState.f[id] = 0;
            return id;
        },

        coverFunction: function (node, walker) {
            var id,
                body = node.body,
                blockBody = body.body,
                popped;

            this.maybeSkipNode(node, 'next');

            id = this.functionName(node, walker.startLineForNode(node), {
                start: node.loc.start,
                end: { line: node.body.loc.start.line, column: node.body.loc.start.column }
            });

            if (blockBody.length > 0 && this.isUseStrictExpression(blockBody[0])) {
                popped = blockBody.shift();
            }
            blockBody.unshift(
                astgen.statement(
                    astgen.postIncrement(
                        astgen.subscript(
                            astgen.dot(astgen.variable(this.currentState.trackerVar), astgen.variable('f')),
                            astgen.stringLiteral(id)
                        )
                    )
                )
            );
            if (popped) {
                blockBody.unshift(popped);
            }
        },

        branchName: function (type, startLine, pathLocations) {
            var bName,
                paths = [],
                locations = [],
                i,
                ignoring = !!this.currentState.ignoring;
            this.currentState.branch += 1;
            bName = this.currentState.branch;
            for (i = 0; i < pathLocations.length; i += 1) {
                pathLocations[i].skip = pathLocations[i].skip || ignoring || undefined;
                locations.push(pathLocations[i]);
                paths.push(0);
            }
            this.coverState.b[bName] = paths;
            this.coverState.branchMap[bName] = { line: startLine, type: type, locations: locations };
            return bName;
        },

        branchIncrementExprAst: function (varName, branchIndex, down) {
            var ret = astgen.postIncrement(
                astgen.subscript(
                    astgen.subscript(
                        astgen.dot(astgen.variable(this.currentState.trackerVar), astgen.variable('b')),
                        astgen.stringLiteral(varName)
                    ),
                    astgen.numericLiteral(branchIndex)
                ),
                down
            );
            return ret;
        },

        locationsForNodes: function (nodes) {
            var ret = [],
                i;
            for (i = 0; i < nodes.length; i += 1) {
                ret.push(nodes[i].loc);
            }
            return ret;
        },

        ifBranchInjector: function (node, walker) {
            var alreadyIgnoring = !!this.currentState.ignoring,
                hint = this.currentState.currentHint,
                ignoreThen = !alreadyIgnoring && hint && hint.type === 'if',
                ignoreElse = !alreadyIgnoring && hint && hint.type === 'else',
                line = node.loc.start.line,
                col = node.loc.start.column,
                makeLoc = function () { return  { line: line, column: col }; },
                bName = this.branchName('if', walker.startLineForNode(node), [
                    { start: makeLoc(), end: makeLoc(), skip: ignoreThen || undefined },
                    { start: makeLoc(), end: makeLoc(), skip: ignoreElse || undefined }
                ]),
                thenBody = node.consequent.body,
                elseBody = node.alternate.body,
                child;
            thenBody.unshift(astgen.statement(this.branchIncrementExprAst(bName, 0)));
            elseBody.unshift(astgen.statement(this.branchIncrementExprAst(bName, 1)));
            if (ignoreThen) { child = node.consequent; child.preprocessor = this.startIgnore; child.postprocessor = this.endIgnore; }
            if (ignoreElse) { child = node.alternate; child.preprocessor = this.startIgnore; child.postprocessor = this.endIgnore; }
        },

        branchLocationFor: function (name, index) {
            return this.coverState.branchMap[name].locations[index];
        },

        switchBranchInjector: function (node, walker) {
            var cases = node.cases,
                bName,
                i;

            if (!(cases && cases.length > 0)) {
                return;
            }
            bName = this.branchName('switch', walker.startLineForNode(node), this.locationsForNodes(cases));
            for (i = 0; i < cases.length; i += 1) {
                cases[i].branchLocation = this.branchLocationFor(bName, i);
                cases[i].consequent.unshift(astgen.statement(this.branchIncrementExprAst(bName, i)));
            }
        },

        switchCaseInjector: function (node) {
            var location = node.branchLocation;
            delete node.branchLocation;
            if (this.maybeSkipNode(node, 'next')) {
                location.skip = true;
            }
        },

        conditionalBranchInjector: function (node, walker) {
            var bName = this.branchName('cond-expr', walker.startLineForNode(node), this.locationsForNodes([ node.consequent, node.alternate ])),
                ast1 = this.branchIncrementExprAst(bName, 0),
                ast2 = this.branchIncrementExprAst(bName, 1);

            node.consequent.preprocessor = this.maybeAddSkip(this.branchLocationFor(bName, 0));
            node.alternate.preprocessor = this.maybeAddSkip(this.branchLocationFor(bName, 1));
            node.consequent = astgen.sequence(ast1, node.consequent);
            node.alternate = astgen.sequence(ast2, node.alternate);
        },

        maybeAddSkip: function (branchLocation) {
            return function (node) {
                var alreadyIgnoring = !!this.currentState.ignoring,
                    hint = this.currentState.currentHint,
                    ignoreThis = !alreadyIgnoring && hint && hint.type === 'next';
                if (ignoreThis) {
                    this.startIgnore();
                    node.postprocessor = this.endIgnore;
                }
                if (ignoreThis || alreadyIgnoring) {
                    branchLocation.skip = true;
                }
            };
        },

        logicalExpressionBranchInjector: function (node, walker) {
            var parent = walker.parent(),
                leaves = [],
                bName,
                tuple,
                i;

            this.maybeSkipNode(node, 'next');

            if (parent && parent.node.type === SYNTAX.LogicalExpression.name) {
                //already covered
                return;
            }

            this.findLeaves(node, leaves);
            bName = this.branchName('binary-expr',
                walker.startLineForNode(node),
                this.locationsForNodes(leaves.map(function (item) { return item.node; }))
            );
            for (i = 0; i < leaves.length; i += 1) {
                tuple = leaves[i];
                tuple.parent[tuple.property] = astgen.sequence(this.branchIncrementExprAst(bName, i), tuple.node);
                tuple.node.preprocessor = this.maybeAddSkip(this.branchLocationFor(bName, i));
            }
        },

        findLeaves: function (node, accumulator, parent, property) {
            if (node.type === SYNTAX.LogicalExpression.name) {
                this.findLeaves(node.left, accumulator, node, 'left');
                this.findLeaves(node.right, accumulator, node, 'right');
            } else {
                accumulator.push({ node: node, parent: parent, property: property });
            }
        },
        maybeAddType: function (node /*, walker */) {
            var props = node.properties,
                i,
                child;
            for (i = 0; i < props.length; i += 1) {
                child = props[i];
                if (!child.type) {
                    child.type = SYNTAX.Property.name;
                }
            }
        },
    };

    if (isNode) {
        module.exports = Instrumenter;
    } else {
        window.Instrumenter = Instrumenter;
    }
}(typeof module !== 'undefined' && typeof module.exports !== 'undefined' && typeof exports !== 'undefined'));
// hack-istanbul - inline-require
}());


/*
file https://github.com/gotwarlost/istanbul/blob/v0.2.16/lib/report/templates/head.txt
*/
local.templateCoverageReport = '\
{{#if isBrowser}}\n\
<div>\n\
{{#unless isBrowser}}\n\
<!doctype html>\n\
<html lang="en" class="x-istanbul">\n\
{{/if isBrowser}}\n\
<head>\n\
    <title>Code coverage report for {{nameOrAllFiles}}</title>\n\
    <meta charset="utf-8">\n\
<style>\n\
/* jslint utility2:true */\n\
/*csslint\n\
    box-model: false,\n\
    important: false,\n\
*/\n\
/* csslint ignore:start */\n\
*,\n\
*:after,\n\
*:before {\n\
    box-sizing: border-box;\n\
}\n\
/* csslint ignore:end */\n\
.x-istanbul {\n\
    font-family: Helvetica Neue, Helvetica, Arial;\n\
    font-size: 10pt;\n\
    margin: 0;\n\
    padding: 0;\n\
}\n\
.x-istanbul pre {\n\
    font-family: Consolas, Menlo, Monaco, monospace;\n\
    font-size: 14px;\n\
    margin: 0;\n\
    padding: 0;\n\
    tab-size: 2;\n\
}\n\
.x-istanbul .cbranch-no {\n\
    background: yellow !important;\n\
    color: #111;\n\
}\n\
.x-istanbul .cbranch-skip {\n\
    background: #ddd !important;\n\
    color: #111;\n\
}\n\
.x-istanbul .com {\n\
    color: #999 !important;\n\
}\n\
.x-istanbul .cover-empty,\n\
.x-istanbul .cover-fill {\n\
    background: white;\n\
    border: 1px solid #999;\n\
    display: inline-block;\n\
    height: 12px;\n\
}\n\
.x-istanbul .cover-empty {\n\
    background: white;\n\
    border-left: none;\n\
}\n\
.x-istanbul .cover-fill {\n\
    background: #ccc;\n\
    border-right: 1px solid #999;\n\
}\n\
.x-istanbul .cover-full {\n\
    border-right: none !important;\n\
}\n\
.x-istanbul .coverage {\n\
    border-collapse: collapse;\n\
    margin: 0;\n\
    padding: 0\n\
}\n\
.x-istanbul .coverage td {\n\
    color: #111;\n\
    margin: 0;\n\
    padding: 0;\n\
    vertical-align: top;\n\
}\n\
.x-istanbul .coverage td .cline-any {\n\
    display: inline-block;\n\
    padding: 0 5px;\n\
    width: 60px;\n\
}\n\
.x-istanbul .coverage td .cline-neutral {\n\
    background: #eee;\n\
}\n\
.x-istanbul .coverage td .cline-no {\n\
    background: #fc8c84;\n\
}\n\
.x-istanbul .coverage td .cline-yes {\n\
    background: #b5d592;\n\
    color: #999;\n\
}\n\
.x-istanbul .coverage .line-count {\n\
    padding-right: 5px;\n\
    text-align: right;\n\
    width: 50px;\n\
}\n\
.x-istanbul .coverage .line-count a {\n\
    text-decoration: none;\n\
}\n\
.x-istanbul .coverage .line-coverage {\n\
    border-left: 1px solid #999;\n\
    border-right: 1px solid #999;\n\
    color: #777 !important;\n\
    text-align: right;\n\
}\n\
.x-istanbul .coverage-summary {\n\
    padding: 20px;\n\
}\n\
.x-istanbul .coverage-summary table {\n\
    border-collapse: collapse;\n\
    margin: auto;\n\
    table-layout: fixed;\n\
    text-align: left;\n\
    width: 100%\n\
}\n\
.x-istanbul .coverage-summary td {\n\
    border: 1px solid #999;\n\
    margin: 0;\n\
    padding: 5px;\n\
    white-space: nowrap;\n\
}\n\
.x-istanbul .coverage-summary th {\n\
    margin: 0;\n\
    padding: 0 0 2px 0;\n\
}\n\
.x-istanbul .cstat-no {\n\
    background: #fc8c84;\n\
    color: #111;\n\
}\n\
.x-istanbul .cstat-skip {\n\
    background: #ddd;\n\
    color: #111;\n\
}\n\
.x-istanbul .cstat-yes {\n\
    color: #111;\n\
}\n\
.x-istanbul .entity,\n\
.x-istanbul .metric {\n\
    font-weight: bold;\n\
}\n\
.x-istanbul .footer,\n\
.x-istanbul .header {\n\
    background: #eee;\n\
    padding: 20px;\n\
}\n\
.x-istanbul .footer {\n\
    border-top: 1px solid #999;\n\
}\n\
.x-istanbul .fstat-no {\n\
    background: #ffc520;\n\
    color: #111 !important;\n\
}\n\
.x-istanbul .fstat-skip {\n\
    background: #ddd;\n\
    color: #111 !important;\n\
}\n\
.x-istanbul .header {\n\
    border-bottom: 1px solid #999;\n\
    top: 0;\n\
    width: 100%;\n\
}\n\
.x-istanbul .high {\n\
    background: #b5d592 !important;\n\
}\n\
.x-istanbul .ignore-none {\n\
    color: #999;\n\
    font-weight: normal;\n\
}\n\
.x-istanbul .low {\n\
    background: #fc8c84 !important;\n\
}\n\
.x-istanbul .medium {\n\
    background: #ffe87c !important;\n\
}\n\
.x-istanbul .meta {\n\
    text-align: center;\n\
}\n\
.x-istanbul .metric {\n\
    background: white;\n\
    border: 1px solid #999;\n\
    display: inline-block;\n\
    padding: .3em;\n\
}\n\
.x-istanbul .missing-if-branch {\n\
    background: black;\n\
    color: yellow;\n\
    display: inline-block;\n\
    margin-right: 10px;\n\
    padding: 0 4px;\n\
    position: relative;\n\
}\n\
.x-istanbul .missing-if-branch .typ,\n\
.x-istanbul .skip-if-branch .typ {\n\
    color: inherit !important;\n\
}\n\
.x-istanbul .prettyprint {\n\
    border: none !important;\n\
    margin: 0 !important;\n\
    padding: 0 !important;\n\
}\n\
.x-istanbul .skip-if-branch {\n\
    background: #ccc;\n\
    color: white;\n\
    display: none;\n\
    margin-right: 10px;\n\
    padding: 0 4px;\n\
    position: relative;\n\
}\n\
/* validateLineSortedReset */\n\
.x-istanbul a {\n\
    color: #00d;\n\
    text-decoration: underline;\n\
}\n\
.x-istanbul pre {\n\
    overflow: visible;\n\
    white-space: pre\n\
}\n\
.x-istanbul .file div {\n\
    margin-bottom: 2px;\n\
    overflow-wrap: break-word;\n\
    white-space: normal;\n\
    width: 100%;\n\
}\n\
.x-istanbul .tableHeader {\n\
    border-collapse: collapse;\n\
    margin: 0 auto 10px auto;\n\
    table-layout: fixed;\n\
    text-align: left;\n\
    width: 100%;\n\
}\n\
.x-istanbul .tableHeader td {\n\
    background: #fff;\n\
    border: 1px solid #999;\n\
    padding: 5px;\n\
}\n\
.x-istanbul .tableHeader th {\n\
    padding: 0 0 2px 0;\n\
}\n\
</style>\n\
</head>\n\
{{#if isBrowser}}\n\
<div class="x-istanbul">\n\
{{#unless isBrowser}}\n\
<body class="x-istanbul">\n\
{{/if isBrowser}}\n\
<script>\n\
// init domOnEventSelectAllWithinPre\n\
(function () {\n\
/*\n\
 * this function will limit select-all within <pre tabIndex="0"> elements\n\
 * https://stackoverflow.com/questions/985272/selecting-text-in-an-element-akin-to-highlighting-with-your-mouse\n\
 */\n\
    "use strict";\n\
    if (window.domOnEventSelectAllWithinPre) {\n\
        return;\n\
    }\n\
    window.domOnEventSelectAllWithinPre = function (evt) {\n\
        var range;\n\
        var selection;\n\
        if (\n\
            evt\n\
            && evt.key === "a"\n\
            && (evt.ctrlKey || evt.metaKey)\n\
            && evt.target.closest(\n\
                "pre"\n\
            )\n\
        ) {\n\
            range = document.createRange();\n\
            range.selectNodeContents(evt.target.closest(\n\
                "pre"\n\
            ));\n\
            selection = window.getSelection();\n\
            selection.removeAllRanges();\n\
            selection.addRange(range);\n\
            evt.preventDefault();\n\
        }\n\
    };\n\
    // handle evt\n\
    document.addEventListener(\n\
        "keydown",\n\
        window.domOnEventSelectAllWithinPre\n\
    );\n\
}());\n\
</script>\n\
<div class="header {{metrics.statements.score}}">\n\
{{#if env.npm_package_homepage}}\n\
    <h2 style="font-weight: bold;">\n\
        <a href="{{env.npm_package_homepage}}">{{env.npm_package_name}} ({{env.npm_package_version}})</a>\n\
    </h2>\n\
{{/if env.npm_package_homepage}}\n\
    <h2>Code coverage report for <span class="entity">{{nameOrAllFiles}}</span></h2>\n\
    <table class="tableHeader">\n\
    <thead>\n\
    <tr>\n\
        <th>Ignored</th>\n\
        <th>Statements</th>\n\
        <th>Branches</th>\n\
        <th>Functions</th>\n\
        <th>Lines</th>\n\
    </tr>\n\
    </thead>\n\
    <tbody>\n\
        <td>\n\
            Statements: {{metrics.statements.skipped}}<br>\n\
            Branches: {{metrics.branches.skipped}}<br>\n\
            Functions: {{metrics.functions.skipped}}\n\
        </td>\n\
        <td>\n\
            {{metrics.statements.pct}}%<br>\n\
            ({{metrics.statements.covered}} / {{metrics.statements.total}})\n\
        </td>\n\
        <td>\n\
            {{metrics.branches.pct}}%<br>\n\
            ({{metrics.branches.covered}} / {{metrics.branches.total}})\n\
        </td>\n\
        <td>\n\
            {{metrics.functions.pct}}%<br>\n\
            ({{metrics.functions.covered}} / {{metrics.functions.total}})\n\
        </td>\n\
        <td>\n\
            {{metrics.lines.pct}}%<br>\n\
            ({{metrics.lines.covered}} / {{metrics.lines.total}})\n\
        </td>\n\
    </tbody>\n\
    </table>\n\
    <div class="path">{{htmlPath notHtmlSafe}}</div>\n\
</div>\n\
<div class="body">\n\
{{#if isFile}}\n\
<pre><table class="coverage"><tr>\n\
        <td class="line-count">{{htmlLineIi notHtmlSafe}}</td>\n\
        <td class="line-coverage">{{htmlLineCnt notHtmlSafe}}</td>\n\
        <td class="text"><pre class="prettyprint lang-js" tabIndex="0">{{htmlLineCode}}</pre></td>\n\
</tr></table></pre>\n\
{{#unless isFile}}\n\
<div class="coverage-summary">\n\
    <table>\n\
    <thead>\n\
    <tr>\n\
        <th data-col="file" data-fmt="html" data-html="true" class="file">File</th>\n\
        <th data-col="statements" data-type="number" data-fmt="pct" class="pct">Statements</th>\n\
        <th data-col="branches" data-type="number" data-fmt="pct" class="pct">Branches</th>\n\
        <th data-col="functions" data-type="number" data-fmt="pct" class="pct">Functions</th>\n\
        <th data-col="lines" data-type="number" data-fmt="pct" class="pct">Lines</th>\n\
    </tr>\n\
    </thead>\n\
    <tbody>\n\
{{#each children}}\n\
    <tr>\n\
        <td class="file {{metrics.statements.score}}" data-value="{{relativeName}}">\n\
            <a href="{{href}}">{{relativeName}}<br>\n\
            <span class="cover-fill cover-full" style="width: {{metrics.statements.width1}}px;"></span><span class="cover-empty" style="width: {{metrics.statements.width2}}px;"></span></a>\n\
        </td>\n\
        <td>\n\
            {{metrics.statements.pct}}%<br>\n\
            ({{metrics.statements.covered}} / {{metrics.statements.total}})\n\
        </td>\n\
        <td>\n\
            {{metrics.branches.pct}}%<br>\n\
            ({{metrics.branches.covered}} / {{metrics.branches.total}})\n\
        </td>\n\
        <td>\n\
            {{metrics.functions.pct}}%<br>\n\
            ({{metrics.functions.covered}} / {{metrics.functions.total}})\n\
        </td>\n\
        <td>\n\
            {{metrics.lines.pct}}%<br>\n\
            ({{metrics.lines.covered}} / {{metrics.lines.total}})\n\
        </td>\n\
    </tr>\n\
{{/each children}}\n\
    </tbody>\n\
    </table>\n\
</div>\n\
{{/if isFile}}\n\
</div>\n\
<div class="footer">\n\
<div class="meta">\n\
    Generated by <a href="https://github.com/kaizhu256/node-utility2" target="_blank">utility2</a> at ${datetime}\n\
</div>\n\
</div>\n\
{{#if isBrowser}}\n\
</div>\n\
</div>\n\
{{#unless isBrowser}}\n\
</body>\n\
</html>\n\
{{/if isBrowser}}\n\
';


/*
file https://img.shields.io/badge/coverage-100.0%-00dd00.svg?style=flat
*/
local.templateCoverageBadgeSvg =
'<svg xmlns="http://www.w3.org/2000/svg" width="117" height="20"><linearGradient id="a" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><rect rx="0" width="117" height="20" fill="#555"/><rect rx="0" x="63" width="54" height="20" fill="#0d0"/><path fill="#0d0" d="M63 0h4v20h-4z"/><rect rx="0" width="117" height="20" fill="url(#a)"/><g fill="#fff" text-anchor="middle" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="11"><text x="32.5" y="15" fill="#010101" fill-opacity=".3">coverage</text><text x="32.5" y="14">coverage</text><text x="89" y="15" fill="#010101" fill-opacity=".3">100.0%</text><text x="89" y="14">100.0%</text></g></svg>';
/* jslint ignore:end */


/*
file none
*/


let fileWrite;
let path;
let reportHtmlWrite;
let reportTextWrite;
// mock path
path = {
    dirname: function (file) {
        return file.replace((
            /\/[\w\-.]+?$/
        ), "");
    },
    resolve: function (...argList) {
        return argList[argList.length - 1];
    },
    sep: "/"
};
// require path
try {
    path = require("path");
} catch (ignore) {}
// init function
fileWrite = function (file, data) {
/*
 * this function will write <data> to <file>
 */
    local.fsWriteFileWithMkdirpSync(file, data);
};
reportHtmlWrite = function (node, dirCoverage, coverage) {
/*
 * this function will recursively write coverage-report of <node> in html-format
 * to <dirCoverage>
 */
    let datetime;
    let htmlAll;
    let lineInsertAt;
    let lineWrapAt;
    let recurse;
    // init function
    lineInsertAt = function (lineObj, col, str, insertBefore) {
    /*
     * this function will insert <str> into <lineObj> at <col>
     */
        let ii;
        let offset;
        let offsetObj;
        col = Math.min(col, lineObj.length0);
        // find offset from col
        offset = col;
        ii = 0;
        while (ii < lineObj.offsets.length) {
            offsetObj = lineObj.offsets[ii];
            if (
                offsetObj.col < col
                || (offsetObj.col === col && !insertBefore)
            ) {
                offset += offsetObj.len;
            }
            if (offsetObj.col >= col) {
                break;
            }
            ii += 1;
        }
        if (offsetObj && offsetObj.col === col) {
            offsetObj.len += str.length;
        } else {
            lineObj.offsets.splice(ii, 0, {
                col,
                len: str.length
            });
        }
        // insert str at offset
        lineObj.text = (
            lineObj.text.slice(0, offset) + str + lineObj.text.slice(offset)
        );
    };
    lineWrapAt = function (lineObj, startCol, startText, endCol, endText) {
    /*
     * this function will wrap <lineObj>.slice(<startCol>, <endCol>)
     * inside <startText> and <endText>
     */
        startCol = Math.min(startCol, lineObj.length0);
        // consumeBlanks
        if (startCol <= lineObj.startCol) {
            startCol = 0;
        }
        lineInsertAt(lineObj, startCol, startText);
        lineInsertAt(lineObj, endCol, endText);
    };
    recurse = function (node, level, dir) {
    /*
     * this function will recursively write <htmlData> from <node>
     * to <dir>/<htmlFile>
     */
        let fileCoverage;
        let htmlData;
        let htmlFile;
        let htmlLineCnt;
        let htmlLineCode;
        let htmlLineIi;
        let htmlPath;
        let ii;
        let jj;
        let kk;
        let lineList;
        let parent;
        let tmp;
        // render htmlPath
        tmp = node;
        parent = tmp.parent;
        htmlPath = tmp.relativeName;
        ii = 1;
        while (parent) {
            htmlPath = (
                "index.html\">" + parent.relativeNameOrAllFiles + "</a>"
                + " &#187; " + htmlPath
            );
            jj = 0;
            while (jj < ii) {
                kk = 0;
                while (kk < tmp.relativeName.split(path.sep).length - 1) {
                    htmlPath = "../" + htmlPath;
                    kk += 1;
                }
                tmp = tmp.parent;
                jj += 1;
            }
            htmlPath = "<a href=\"" + htmlPath;
            parent = parent.parent;
            ii += 1;
        }
        // write dir
        if (!node.isFile) {
            htmlFile = dir + "/index.html";
            htmlData = local.templateRender(
                local.templateCoverageReport,
                Object.assign({
                    datetime,
                    env: process.env,
                    htmlPath,
                    isBrowser: local.isBrowser
                }, node)
            );
            htmlAll += htmlData + "\n\n";
            fileWrite(htmlFile, htmlData);
            node.children.forEach(function (child) {
                recurse(child, level + 1, dir + "/" + child.relativeName);
            });
            return;
        }
        // write file
        htmlFile = dir + ".html";
        fileCoverage = coverage[node.pathname];
        lineList = [].concat("", fileCoverage.code, "").map(function (text) {
            let endCol;
            let startCol;
            // new InsertionText
            // init startCol
            startCol = -1;
            ii = 0;
            while (ii < text.length) {
                if (!text[ii].match(
                    /[\u0020\f\n\r\t\u000b\u00a0\u2028\u2029]/
                )) {
                    startCol = ii;
                    break;
                }
                ii += 1;
            }
            // init endCol
            endCol = text.length + 1;
            ii = text.length - 1;
            while (ii >= 0) {
                if (!text[ii].match(
                    /[\u0020\f\n\r\t\u000b\u00a0\u2028\u2029]/
                )) {
                    endCol = ii;
                    break;
                }
                ii -= 1;
            }
            return {
                endCol,
                length0: text.length,
                offsets: [],
                startCol,
                text
            };
        });
        //note: order is important, since statements typically result
        //in spanning the whole line and doing branches late
        //causes mismatched tags
        // annotateBranches(fileCoverage, lineList);
        Object.entries(fileCoverage.b).forEach(function ([
            key,
            list
        ]) {
            if (list.reduce(function (aa, bb) {
                return aa + bb;
            }, 0) <= 0) {
                return;
            }
            //only highlight if partial branches are missing
            list.forEach(function (cnt, ii) {
                let endCol;
                let endLine;
                let lineObj;
                let meta;
                let startLine;
                if (cnt !== 0) {
                    return;
                }
                meta = fileCoverage.branchMap[key].locations[ii];
                endCol = meta.end.column + 1;
                endLine = meta.end.line;
                startLine = meta.start.line;
                //skip branches taken
                if (endLine !== startLine) {
                    endLine = startLine;
                    endCol = lineList[startLine].length0;
                }
                lineObj = lineList[startLine];
                if (fileCoverage.branchMap[key].type === "if") {
                    // and "if" is a special case since the else branch
                    // might not be visible, being non-existent
                    lineInsertAt(
                        lineObj,
                        meta.start.column,
                        "\u0001span class=\"" + (
                            meta.skip
                            ? "skip-if-branch"
                            : "missing-if-branch"
                        ) + "\" title=\"" + (
                            ii === 0
                            ? "if path not taken\"\u0002I"
                            : "else path not taken\"\u0002E"
                        ) + "\u0001/span\u0002",
                        true
                    );
                    return;
                }
                lineWrapAt(
                    lineObj,
                    meta.start.column,
                    "\u0001span class=\"branch-" + ii + " " + (
                        meta.skip
                        ? "cbranch-skip"
                        : "cbranch-no"
                    ) + "\" title=\"branch not covered\"\u0002",
                    endCol,
                    "\u0001/span\u0002"
                );
            });
        });
        // annotateFunctions(fileCoverage, lineList);
        Object.entries(fileCoverage.f).forEach(function ([
            key,
            cnt
        ]) {
            let endCol;
            let endLine;
            let lineObj;
            let meta;
            let startLine;
            if (cnt !== 0) {
                return;
            }
            meta = fileCoverage.fnMap[key];
            endCol = meta.loc.end.column + 1;
            endLine = meta.loc.end.line;
            startLine = meta.loc.start.line;
            if (endLine !== startLine) {
                endLine = startLine;
                endCol = lineList[startLine].length0;
            }
            lineObj = lineList[startLine];
            lineWrapAt(
                lineObj,
                meta.loc.start.column,
                "\u0001span class=\"" + (
                    meta.skip
                    ? "fstat-skip"
                    : "fstat-no"
                ) + "\" title=\"function not covered\"\u0002",
                endCol,
                "\u0001/span\u0002"
            );
        });
        // annotateStatements(fileCoverage, lineList);
        Object.entries(fileCoverage.s).forEach(function ([
            key,
            cnt
        ]) {
            let endCol;
            let endLine;
            let lineObj;
            let meta;
            let startLine;
            if (cnt !== 0) {
                return;
            }
            meta = fileCoverage.statementMap[key];
            endCol = meta.end.column + 1;
            startLine = meta.start.line;
            endLine = meta.end.line;
            if (endLine !== startLine) {
                endLine = startLine;
                endCol = lineList[startLine].length0;
            }
            lineObj = lineList[startLine];
            lineWrapAt(
                lineObj,
                meta.start.column,
                "\u0001span class=\"" + (
                    meta.skip
                    ? "cstat-skip"
                    : "cstat-no"
                ) + "\" title=\"statement not covered\"\u0002",
                endCol,
                "\u0001/span\u0002"
            );
        });
        // remove trailing whitespace
        ii = lineList.length - 1;
        while (ii > 1 && !lineList[ii].text.trim()) {
            lineList.pop();
            ii -= 1;
        }
        htmlLineCnt = "";
        htmlLineCode = "\n";
        htmlLineIi = "";
        ii = 1;
        while (ii < lineList.length) {
            // render htmlLineIi
            htmlLineIi += `<a href="#l${ii}" id="l${ii}">${ii}</a>` + "\n";
            tmp = fileCoverage.l[ii];
            htmlLineCnt += (
                tmp === undefined
                ? `<span class="cline-any cline-neutral">&nbsp;</span>`
                : tmp > 0
                ? `<span class="cline-any cline-yes">${tmp}</span>`
                : `<span class="cline-any cline-no">&nbsp;</span>`
            ) + "\n";
            htmlLineCode += lineList[ii].text + "\n";
            ii += 1;
        }
        htmlLineCode = htmlLineCode.replace((
            /&/g
        ), "&amp;").replace((
            /</g
        ), "&lt;").replace((
            />/g
        ), "&gt;").replace((
            /\u0001/g
        ), "<").replace((
            /\u0002/g
        ), ">");
        htmlData = local.templateRender(
            local.templateCoverageReport,
            Object.assign({
                datetime,
                env: process.env,
                htmlLineCnt,
                htmlLineIi,
                htmlPath,
                isBrowser: local.isBrowser,
                lineList
            }, node)
        );
        htmlData = htmlData.split("{{htmlLineCode}}");
        htmlData.splice(1, 0, htmlLineCode);
        htmlData = htmlData.join("");
        htmlAll += htmlData + "\n\n";
        fileWrite(htmlFile, htmlData);
    };
    // init datetime
    datetime = new Date().toGMTString();
    // init htmlAll
    htmlAll = (
        `<div class="coverageReportDiv">
<h2>coverage-report</h2>
<div style="background: #fff; border: 1px solid #999; margin 0; padding: 0;">`
    ) + "\n";
    // recursively write html
    recurse(node, 0, dirCoverage);
    htmlAll += "</div>\n</div>\n";
    // write coverage.all.html
    fileWrite(dirCoverage + "/coverage.all.html", htmlAll);
    // return htmlAll
    return htmlAll;
};
reportTextWrite = function (node, dircoverage) {
/*
 * this function will recursively write coverage-report of <node> in text-format
 * to <dircoverage>/coverage.txt
 */
    let nodeNameWidth;
    let recurse;
    let result;
    let stringPad;
    // init function
    recurse = function (node, level) {
        // update nodeNameWidth
        nodeNameWidth = Math.max(
            nodeNameWidth,
            Math.max(level, 0) * 2 + node.relativeNameOrAllFiles.length
        );
        // format metrics
        return [
            node.metrics.statements,
            node.metrics.statements,
            node.metrics.branches,
            node.metrics.functions,
            node.metrics.lines
        ].map(function ({
            pct,
            score
        }, ii) {
            return (
                ii === 0
                ? stringPad(
                    node.relativeNameOrAllFiles,
                    nodeNameWidth,
                    false,
                    Math.max(level, 0) * 2,
                    score
                )
                : stringPad(String(pct), 8, true, 0, score)
            );
        }).join(" |") + " |\n" + node.children.map(function (child) {
            return recurse(child, level + 1);
        }).join("");
    };
    stringPad = function (str, width, right, indent, score) {
    /*
     * this function will pad <str> to given <width>
     */
        let fillStr;
        let fmtStr;
        fmtStr = "";
        fillStr = " ".repeat(width - indent - str.length);
        fmtStr = (
            right
            ? fillStr + str
            : str + fillStr
        );
        // colorize
        switch (process.stdout.isTTY && score) {
        case "high":
            fmtStr = "\u001b[92m" + fmtStr + "\u001b[0m";
            break;
        case "low":
            fmtStr = "\u001b[91m" + fmtStr + "\u001b[0m";
            break;
        case "medium":
            fmtStr = "\u001b[93m" + fmtStr + "\u001b[0m";
            break;
        }
        return " ".repeat(indent) + fmtStr;
    };
    // init nodeNameWidth
    nodeNameWidth = 0;
    recurse(node, -1);
    // write coverage-report
    result = (
        "-".repeat(nodeNameWidth)
        + "-|---------|---------|---------|---------|\n"
    );
    result = (
        result
        + stringPad("File", nodeNameWidth, false, 0, "")
        + " | % Stmts | % Brchs | % Funcs | % Lines |\n"
        + result
        + recurse(node, -1)
        + result
    );
    console.error(result);
    fileWrite(dircoverage + "/coverage.txt", result);
};


// init local
local.coverageMerge = function (coverage1 = {}, coverage2 = {}) {
/*
 * this function will inplace-merge <coverage2> into <coverage1>
 */
    let dict1;
    let dict2;
    Object.keys(coverage2).forEach(function (file) {
        // if coverage1[file] is undefined, then override it
        if (!coverage1[file]) {
            coverage1[file] = coverage2[file];
            return;
        }
        // merge coverage2 into coverage1
        [
            "b", "f", "s"
        ].forEach(function (key) {
            dict1 = coverage1[file][key];
            dict2 = coverage2[file][key];
            switch (key) {
            // increment coverage for branch lines
            case "b":
                Object.keys(dict2).forEach(function (key) {
                    dict2[key].forEach(function (cnt, ii) {
                        dict1[key][ii] += cnt;
                    });
                });
                break;
            // increment coverage for function and statement lines
            case "f":
            case "s":
                Object.keys(dict2).forEach(function (key) {
                    dict1[key] += dict2[key];
                });
                break;
            }
        });
    });
    return coverage1;
};

local.coverageReportCreate = function ({
    coverage,
    coverageInclude
}) {
/*
 * this function will
    // 1. merge previous <dirCoverage>/coverage.json into <coverage>
    // 2. convert <coverage> to <summaryDict>
    // 3. convert <summaryDict> to <nodeRoot>
    // 4. convert <nodeRoot> to text-report <dirCoverage>/coverage.txt
    // 5. convert <nodeRoot> to html-report <dirCoverage>/\*
    // 6. return coverage-report in html-format as single document
 */
    let dirCoverage;
    let filePrefix;
    let htmlAll;
    let nodeChildAdd;
    let nodeCreate;
    let nodeDict;
    let nodeNormalize;
    let nodeRoot;
    let summaryDict;
    let tmp;
    // init function
    nodeChildAdd = function (node, child) {
    /*
     * this function will add <child> to <node>
     */
        node.children.push(child);
        child.parent = node;
    };
    nodeCreate = function (pathname) {
    /*
     * this function will create a tree-node
     */
        return {
            children: [],
            pathname,
            metrics: {
                branches: {
                    total: 0,
                    covered: 0,
                    skipped: 0,
                    pct: "Unknown"
                },
                functions: {
                    total: 0,
                    covered: 0,
                    skipped: 0,
                    pct: "Unknown"
                },
                lines: {
                    total: 0,
                    covered: 0,
                    skipped: 0,
                    pct: "Unknown"
                },
                statements: {
                    total: 0,
                    covered: 0,
                    skipped: 0,
                    pct: "Unknown"
                }
            },
            name: pathname
        };
    };
    nodeNormalize = function (node, level, filePrefix, parent) {
    /*
     * this function will recursively normalize <node> and its children
     */
        let metric;
        // init name
        if (node.name.indexOf(filePrefix) === 0) {
            node.name = node.name.slice(filePrefix.length);
        }
        if (node.name[0] === path.sep) {
            node.name = node.name.slice(1);
        }
        // init relativeName
        node.relativeName = (
            parent
            ? (
                parent.name !== "__root__/"
                ? node.name.slice(parent.name.length)
                : node.name
            )
            : node.name.slice(filePrefix.length)
        );
        // init nameOrAllFiles
        node.nameOrAllFiles = node.name || "All files";
        // init relativeNameOrAllFiles
        node.relativeNameOrAllFiles = node.relativeName || "All files";
        // init href
        node.href = node.relativeName.split(path.sep).join("/") + (
            node.isFile
            ? ".html"
            : "index.html"
        );
        // recurse
        node.children.forEach(function (child) {
            nodeNormalize(child, level + 1, filePrefix, node);
        });
        // sort children by name
        node.children.sort(function (aa, bb) {
            return (
                aa.name > bb.name
                ? 1
                : -1
            );
        });
        // init metrics
        if (!node.isFile) {
            node.children.forEach(function (child) {
                [
                    "lines", "statements", "branches", "functions"
                ].forEach(function (key) {
                    metric = node.metrics[key];
                    metric.total += child.metrics[key].total;
                    metric.covered += child.metrics[key].covered;
                    metric.skipped += child.metrics[key].skipped;
                });
            });
        }
        // calculate pct and score
        [
            "lines", "statements", "branches", "functions"
        ].forEach(function (key) {
            metric = node.metrics[key];
            metric.pct = (
                metric.total > 0
                ? Math.floor(
                    (1000 * 100 * metric.covered / metric.total + 5)
                    / 10
                ) / 100
                : 100
            );
            metric.width1 = metric.pct | 0;
            metric.width2 = 100 - metric.width1;
            metric.score = (
                metric.pct >= 80
                ? "high"
                : metric.pct >= 50
                ? "medium"
                : "low"
            );
        });
    };
    // 1. merge previous <dirCoverage>/coverage.json into <coverage>
    dirCoverage = path.resolve(".tmp/build/coverage");
    coverageInclude = coverageInclude || globalThis.__coverageInclude__;
    if (!local.isBrowser && process.env.npm_config_mode_coverage_merge) {
        console.error(
            "istanbul - merging file "
            + dirCoverage + "/coverage.json to coverage"
        );
        local.coverageMerge(coverage, local.fsReadFileOrDefaultSync(
            dirCoverage + "/coverage.json",
            "json",
            {}
        ));
        Object.keys(local.fsReadFileOrDefaultSync(
            dirCoverage + "/coverage.include.json",
            "json",
            {}
        )).forEach(function (file) {
            coverageInclude[file] = 1;
        });
    }
    // 2. convert <coverage> to <summaryDict>
    summaryDict = {};
    Object.entries(coverage).forEach(function ([
        file,
        fileCoverage
    ]) {
        let map;
        let metric;
        let skipped;
        let summary;
        if (fileCoverage && coverageInclude.hasOwnProperty(file)) {
            // reset line-cnt
            delete coverage[file].l;
            // init summary
            summary = {
                branches: {
                    total: 0,
                    covered: 0,
                    skipped: 0,
                    pct: "Unknown"
                },
                functions: {
                    total: 0,
                    covered: 0,
                    skipped: 0,
                    pct: "Unknown"
                },
                lines: {
                    total: 0,
                    covered: 0,
                    skipped: 0,
                    pct: "Unknown"
                },
                statements: {
                    total: 0,
                    covered: 0,
                    skipped: 0,
                    pct: "Unknown"
                }
            };
            // init line-cnt
            fileCoverage.l = {};
            Object.entries(fileCoverage.s).forEach(function ([
                key,
                cnt
            ]) {
                if (cnt === 0 && fileCoverage.statementMap[key].skip) {
                    cnt = 1;
                }
                fileCoverage.l[
                    fileCoverage.statementMap[key].start.line
                ] = Math.max(fileCoverage.l[
                    fileCoverage.statementMap[key].start.line
                ] | 0, cnt);
            });
            // computeSimpleTotals
            [
                [
                    "lines", "l"
                ],
                [
                    "functions", "f", "fnMap"
                ],
                [
                    "statements", "s", "statementMap"
                ]
            ].forEach(function ([
                keyMetric, keyCovered, keyMap
            ]) {
                map = fileCoverage[keyMap];
                metric = {
                    total: 0,
                    covered: 0,
                    skipped: 0
                };
                Object.entries(fileCoverage[keyCovered]).forEach(function ([
                    key,
                    covered
                ]) {
                    skipped = map && map[key].skip;
                    metric.total += 1;
                    metric.covered += Boolean(covered || skipped);
                    metric.skipped += Boolean(!covered && skipped);
                });
                summary[keyMetric] = metric;
            });
            // computeBranchTotals
            metric = {
                total: 0,
                covered: 0,
                skipped: 0
            };
            Object.entries(fileCoverage.b).forEach(function ([
                key,
                branches
            ]) {
                map = fileCoverage.branchMap[key].locations;
                branches.forEach(function (covered, ii) {
                    skipped = map && map[ii] && map[ii].skip;
                    metric.covered += Boolean(covered || skipped);
                    metric.skipped += Boolean(!covered && skipped);
                });
                metric.total += branches.length;
            });
            summary.branches = metric;
            summaryDict[file] = summary;
            // findCommonArrayPrefix
            tmp = file.split(path.sep);
            if (!filePrefix) {
                filePrefix = tmp.slice(0, -1);
                return;
            }
            filePrefix.some(function (elem, ii) {
                if (elem !== tmp[ii]) {
                    filePrefix = filePrefix.slice(0, ii);
                    return true;
                }
            });
        }
    });
    // 3. convert <summaryDict> to <nodeRoot>
    filePrefix = filePrefix || [];
    tmp = filePrefix.join(path.sep) + path.sep;
    nodeRoot = nodeCreate(tmp);
    nodeDict = {};
    nodeDict[tmp] = nodeRoot;
    Object.entries(summaryDict).forEach(function ([
        key,
        metrics
    ]) {
        let node;
        let parent;
        let parentPath;
        node = nodeCreate(key);
        node.isFile = true;
        node.metrics = metrics;
        nodeDict[key] = node;
        parentPath = path.dirname(key) + path.sep;
        if (parentPath === path.sep + path.sep) {
            parentPath = path.sep + "__root__" + path.sep;
        }
        parent = nodeDict[parentPath];
        if (!parent) {
            parent = nodeCreate(parentPath);
            nodeChildAdd(nodeRoot, parent);
            nodeDict[parentPath] = parent;
        }
        nodeChildAdd(parent, node);
    });
    nodeNormalize(nodeRoot, 0, filePrefix.join(path.sep) + path.sep);
    // 4. convert <nodeRoot> to text-report <dirCoverage>/coverage.txt
    reportTextWrite(nodeRoot, dirCoverage);
    // 5. convert <nodeRoot> to html-report <dirCoverage>/\*
    htmlAll = reportHtmlWrite(nodeRoot, dirCoverage, coverage);
    // save coverage to dirCoverage/coverage.json
    fileWrite(
        dirCoverage + "/coverage.json",
        JSON.stringify(coverage, undefined, 4)
    );
    // save coverageInclude to dirCoverage/coverage.include.json
    fileWrite(
        dirCoverage + "/coverage.include.json",
        JSON.stringify(coverageInclude, undefined, 4)
    );
    // write coverage.badge.svg
    tmp = nodeRoot.metrics.lines.pct;
    fileWrite(
        dirCoverage + "/coverage.badge.svg",
        // edit coverage badge percent
        // edit coverage badge color
        local.templateCoverageBadgeSvg.replace((
            /100.0/g
        ), tmp).replace((
            /0d0/g
        ), (
            Math.round((100 - tmp) * 2.21).toString(16).padStart(2, "0")
            + Math.round(tmp * 2.21).toString(16).padStart(2, "0")
            + "00"
        ))
    );
    console.error(
        "istanbul - created coverage file " + dirCoverage + "/index.html"
    );
    // 6. return coverage-report in html-format as single document
    return htmlAll;
};

local.instrumentInPackage = function (code, file) {
/*
 * this function will instrument <code>
 * if macro /\* istanbul instrument in package $npm_package_nameLib *\/
 * exists in <code>
 */
    return (
        (
            process.env.npm_config_mode_coverage
            && code.indexOf("/* istanbul ignore all */\n") < 0 && (
                process.env.npm_config_mode_coverage === "all"
                || process.env.npm_config_mode_coverage === "node_modules"
                || code.indexOf(
                    "/* istanbul instrument in package "
                    + process.env.npm_package_nameLib + " */\n"
                ) >= 0
                || code.indexOf(
                    "/* istanbul instrument in package "
                    + process.env.npm_config_mode_coverage + " */\n"
                ) >= 0
            )
        )
        ? local.instrumentSync(code, file)
        : code
    );
};

local.instrumentSync = function (code, file) {
/*
 * this function will
    // 1. normalize <file>
    // 2. save <code> to __coverageInclude__[<file>] for future html-report
    // 3. return instrumented-code
 */
    // 1. normalize <file>
    file = path.resolve(file);
    // 2. save <code> to __coverageInclude__[<file>] for future html-report
    // 3. return instrumented-code
    return (
        "globalThis.__coverageInclude__ = globalThis.__coverageInclude__ || {};"
        + "globalThis.__coverageInclude__[" + JSON.stringify(file) + "] = 1;\n"
    ) + new local.Instrumenter({
        embedSource: true,
        esModules: true,
        noAutoWrap: true
    }).instrumentSync(code, file).trimStart();
};
}());


// run node js-env code - init-after
/* istanbul ignore next */
(function () {
if (local.isBrowser) {
    return;
}


local.cliDict = {};
local.cliDict.cover = function () {
/*
 * <script>
 * will run and cover <script>
 */
    let moduleExtensionsJs;
    let tmp;
    try {
        tmp = JSON.parse(require("fs").readFileSync("package.json", "utf8"));
        process.env.npm_package_nameLib = (
            process.env.npm_package_nameLib
            || tmp.nameLib
            || tmp.name.replace((
                /-/g
            ), "_")
        );
    } catch (ignore) {}
    process.env.npm_config_mode_coverage = (
        process.env.npm_config_mode_coverage
        || process.env.npm_package_nameLib
        || "all"
    );
    // add coverage hook to require
    tmp = require("module");
    moduleExtensionsJs = tmp._extensions[".js"];
    tmp._extensions[".js"] = function (module, file) {
        if (typeof file === "string" && (
            file.indexOf(process.cwd() + require("path").sep) === 0 && (
                process.env.npm_config_mode_coverage === "node_modules"
                || file.indexOf(
                    require("path").resolve("node_modules")
                    + require("path").sep
                ) !== 0
            )
        )) {
            module._compile(local.instrumentInPackage(
                require("fs").readFileSync(file, "utf8"),
                file
            ), file);
            return;
        }
        moduleExtensionsJs(module, file);
    };
    // init process.argv
    process.argv.splice(1, 2);
    process.argv[1] = require("path").resolve(process.argv[1]);
    console.error("\nistanbul - covering $ " + process.argv.join(" "));
    // create coverage on exit
    process.on("exit", function () {
        local.coverageReportCreate({
            coverage: globalThis.__coverage__
        });
    });
    // re-init cli
    tmp.runMain();
};

local.cliDict.instrument = function () {
/*
 * <script>
 * will instrument <script> and print result to stdout
 */
    process.argv[3] = require("path").resolve(process.argv[3]);
    process.stdout.write(local.instrumentSync(
        require("fs").readFileSync(process.argv[3], "utf8"),
        process.argv[3]
    ));
};

local.cliDict.report = function () {
/*
 * <coverageJson>
 * will create coverage-report from file <coverageJson>
 */
    process.argv[3] = require("path").resolve(process.argv[3]);
    globalThis.__coverage__ = JSON.parse(
        require("fs").readFileSync(process.argv[3])
    );
    globalThis.__coverageInclude__ = {};
    Object.keys(globalThis.__coverage__).forEach(function (file) {
        globalThis.__coverageInclude__[file] = 1;
    });
    local.coverageReportCreate({
        coverage: globalThis.__coverage__
    });
};

local.cliDict.test = function () {
/*
 * <script>
 * will run and cover <script> if env-var $npm_config_mode_coverage is set
 */
    if (process.env.npm_config_mode_coverage) {
        process.argv[2] = "cover";
        // re-init cli
        local.cliDict[process.argv[2]]();
        return;
    }
    // restart node with __filename removed from process.argv
    process.argv.splice(1, 2);
    process.argv[1] = require("path").resolve(process.argv[1]);
    // re-init cli
    require("module").runMain();
};

// run the cli
if (module === require.main && !globalThis.utility2_rollup) {
    local.cliRun({});
}
}());
}());