pretty-print-worker.js

(function (factory) {
    typeof define === 'function' && define.amd ? define(factory) :
    factory();
})((function () { 'use strict';

    (function() {
        const env = {"NODE_ENV":"production"};
        try {
            if (process) {
                process.env = Object.assign({}, process.env);
                Object.assign(process.env, env);
                return;
            }
        } catch (e) {} // avoid ReferenceError: process is not defined
        globalThis.process = { env:env };
    })();

    var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};

    function getAugmentedNamespace(n) {
      if (n.__esModule) return n;
      var f = n.default;
    	if (typeof f == "function") {
    		var a = function a () {
    			if (this instanceof a) {
    				var args = [null];
    				args.push.apply(args, arguments);
    				var Ctor = Function.bind.apply(f, args);
    				return new Ctor();
    			}
    			return f.apply(this, arguments);
    		};
    		a.prototype = f.prototype;
      } else a = {};
      Object.defineProperty(a, '__esModule', {value: true});
    	Object.keys(n).forEach(function (k) {
    		var d = Object.getOwnPropertyDescriptor(n, k);
    		Object.defineProperty(a, k, d.get ? d : {
    			enumerable: true,
    			get: function () {
    				return n[k];
    			}
    		});
    	});
    	return a;
    }

    var sourceMap$1 = {};

    var sourceMapGenerator = {};

    var base64Vlq = {};

    var base64 = {};

    var hasRequiredBase64;

    function requireBase64 () {
    	if (hasRequiredBase64) return base64;
    	hasRequiredBase64 = 1;
    	/*
    	 * Copyright 2011 Mozilla Foundation and contributors
    	 * Licensed under the New BSD license. See LICENSE or:
    	 * http://opensource.org/licenses/BSD-3-Clause
    	 */

    	const intToCharMap = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".split("");

    	/**
    	 * Encode an integer in the range of 0 to 63 to a single base 64 digit.
    	 */
    	base64.encode = function(number) {
    	  if (0 <= number && number < intToCharMap.length) {
    	    return intToCharMap[number];
    	  }
    	  throw new TypeError("Must be between 0 and 63: " + number);
    	};
    	return base64;
    }

    var hasRequiredBase64Vlq;

    function requireBase64Vlq () {
    	if (hasRequiredBase64Vlq) return base64Vlq;
    	hasRequiredBase64Vlq = 1;
    	/*
    	 * Copyright 2011 Mozilla Foundation and contributors
    	 * Licensed under the New BSD license. See LICENSE or:
    	 * http://opensource.org/licenses/BSD-3-Clause
    	 *
    	 * Based on the Base 64 VLQ implementation in Closure Compiler:
    	 * https://code.google.com/p/closure-compiler/source/browse/trunk/src/com/google/debugging/sourcemap/Base64VLQ.java
    	 *
    	 * Copyright 2011 The Closure Compiler Authors. All rights reserved.
    	 * 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.
    	 *  * Neither the name of Google Inc. nor the names of its
    	 *    contributors may be used to endorse or promote products derived
    	 *    from this software without specific prior written permission.
    	 *
    	 * 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 THE COPYRIGHT
    	 * OWNER OR CONTRIBUTORS 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.
    	 */

    	const base64 = requireBase64();

    	// A single base 64 digit can contain 6 bits of data. For the base 64 variable
    	// length quantities we use in the source map spec, the first bit is the sign,
    	// the next four bits are the actual value, and the 6th bit is the
    	// continuation bit. The continuation bit tells us whether there are more
    	// digits in this value following this digit.
    	//
    	//   Continuation
    	//   |    Sign
    	//   |    |
    	//   V    V
    	//   101011

    	const VLQ_BASE_SHIFT = 5;

    	// binary: 100000
    	const VLQ_BASE = 1 << VLQ_BASE_SHIFT;

    	// binary: 011111
    	const VLQ_BASE_MASK = VLQ_BASE - 1;

    	// binary: 100000
    	const VLQ_CONTINUATION_BIT = VLQ_BASE;

    	/**
    	 * Converts from a two-complement value to a value where the sign bit is
    	 * placed in the least significant bit.  For example, as decimals:
    	 *   1 becomes 2 (10 binary), -1 becomes 3 (11 binary)
    	 *   2 becomes 4 (100 binary), -2 becomes 5 (101 binary)
    	 */
    	function toVLQSigned(aValue) {
    	  return aValue < 0
    	    ? ((-aValue) << 1) + 1
    	    : (aValue << 1) + 0;
    	}

    	/**
    	 * Returns the base 64 VLQ encoded value.
    	 */
    	base64Vlq.encode = function base64VLQ_encode(aValue) {
    	  let encoded = "";
    	  let digit;

    	  let vlq = toVLQSigned(aValue);

    	  do {
    	    digit = vlq & VLQ_BASE_MASK;
    	    vlq >>>= VLQ_BASE_SHIFT;
    	    if (vlq > 0) {
    	      // There are still more digits in this value, so we must make sure the
    	      // continuation bit is marked.
    	      digit |= VLQ_CONTINUATION_BIT;
    	    }
    	    encoded += base64.encode(digit);
    	  } while (vlq > 0);

    	  return encoded;
    	};
    	return base64Vlq;
    }

    var util = {};

    var hasRequiredUtil;

    function requireUtil () {
    	if (hasRequiredUtil) return util;
    	hasRequiredUtil = 1;
    	(function (exports) {
    		/*
    		 * Copyright 2011 Mozilla Foundation and contributors
    		 * Licensed under the New BSD license. See LICENSE or:
    		 * http://opensource.org/licenses/BSD-3-Clause
    		 */

    		/**
    		 * This is a helper function for getting values from parameter/options
    		 * objects.
    		 *
    		 * @param args The object we are extracting values from
    		 * @param name The name of the property we are getting.
    		 * @param defaultValue An optional value to return if the property is missing
    		 * from the object. If this is not specified and the property is missing, an
    		 * error will be thrown.
    		 */
    		function getArg(aArgs, aName, aDefaultValue) {
    		  if (aName in aArgs) {
    		    return aArgs[aName];
    		  } else if (arguments.length === 3) {
    		    return aDefaultValue;
    		  }
    		    throw new Error('"' + aName + '" is a required argument.');

    		}
    		exports.getArg = getArg;

    		const urlRegexp = /^(?:([\w+\-.]+):)?\/\/(?:(\w+:\w+)@)?([\w.-]*)(?::(\d+))?(.*)$/;
    		const dataUrlRegexp = /^data:.+\,.+$/;

    		function urlParse(aUrl) {
    		  const match = aUrl.match(urlRegexp);
    		  if (!match) {
    		    return null;
    		  }
    		  return {
    		    scheme: match[1],
    		    auth: match[2],
    		    host: match[3],
    		    port: match[4],
    		    path: match[5]
    		  };
    		}
    		exports.urlParse = urlParse;

    		function urlGenerate(aParsedUrl) {
    		  let url = "";
    		  if (aParsedUrl.scheme) {
    		    url += aParsedUrl.scheme + ":";
    		  }
    		  url += "//";
    		  if (aParsedUrl.auth) {
    		    url += aParsedUrl.auth + "@";
    		  }
    		  if (aParsedUrl.host) {
    		    url += aParsedUrl.host;
    		  }
    		  if (aParsedUrl.port) {
    		    url += ":" + aParsedUrl.port;
    		  }
    		  if (aParsedUrl.path) {
    		    url += aParsedUrl.path;
    		  }
    		  return url;
    		}
    		exports.urlGenerate = urlGenerate;

    		const MAX_CACHED_INPUTS = 32;

    		/**
    		 * Takes some function `f(input) -> result` and returns a memoized version of
    		 * `f`.
    		 *
    		 * We keep at most `MAX_CACHED_INPUTS` memoized results of `f` alive. The
    		 * memoization is a dumb-simple, linear least-recently-used cache.
    		 */
    		function lruMemoize(f) {
    		  const cache = [];

    		  return function(input) {
    		    for (let i = 0; i < cache.length; i++) {
    		      if (cache[i].input === input) {
    		        const temp = cache[0];
    		        cache[0] = cache[i];
    		        cache[i] = temp;
    		        return cache[0].result;
    		      }
    		    }

    		    const result = f(input);

    		    cache.unshift({
    		      input,
    		      result,
    		    });

    		    if (cache.length > MAX_CACHED_INPUTS) {
    		      cache.pop();
    		    }

    		    return result;
    		  };
    		}

    		/**
    		 * Normalizes a path, or the path portion of a URL:
    		 *
    		 * - Replaces consecutive slashes with one slash.
    		 * - Removes unnecessary '.' parts.
    		 * - Removes unnecessary '<dir>/..' parts.
    		 *
    		 * Based on code in the Node.js 'path' core module.
    		 *
    		 * @param aPath The path or url to normalize.
    		 */
    		const normalize = lruMemoize(function normalize(aPath) {
    		  let path = aPath;
    		  const url = urlParse(aPath);
    		  if (url) {
    		    if (!url.path) {
    		      return aPath;
    		    }
    		    path = url.path;
    		  }
    		  const isAbsolute = exports.isAbsolute(path);

    		  // Split the path into parts between `/` characters. This is much faster than
    		  // using `.split(/\/+/g)`.
    		  const parts = [];
    		  let start = 0;
    		  let i = 0;
    		  while (true) {
    		    start = i;
    		    i = path.indexOf("/", start);
    		    if (i === -1) {
    		      parts.push(path.slice(start));
    		      break;
    		    } else {
    		      parts.push(path.slice(start, i));
    		      while (i < path.length && path[i] === "/") {
    		        i++;
    		      }
    		    }
    		  }

    		  let up = 0;
    		  for (i = parts.length - 1; i >= 0; i--) {
    		    const part = parts[i];
    		    if (part === ".") {
    		      parts.splice(i, 1);
    		    } else if (part === "..") {
    		      up++;
    		    } else if (up > 0) {
    		      if (part === "") {
    		        // The first part is blank if the path is absolute. Trying to go
    		        // above the root is a no-op. Therefore we can remove all '..' parts
    		        // directly after the root.
    		        parts.splice(i + 1, up);
    		        up = 0;
    		      } else {
    		        parts.splice(i, 2);
    		        up--;
    		      }
    		    }
    		  }
    		  path = parts.join("/");

    		  if (path === "") {
    		    path = isAbsolute ? "/" : ".";
    		  }

    		  if (url) {
    		    url.path = path;
    		    return urlGenerate(url);
    		  }
    		  return path;
    		});
    		exports.normalize = normalize;

    		/**
    		 * Joins two paths/URLs.
    		 *
    		 * @param aRoot The root path or URL.
    		 * @param aPath The path or URL to be joined with the root.
    		 *
    		 * - If aPath is a URL or a data URI, aPath is returned, unless aPath is a
    		 *   scheme-relative URL: Then the scheme of aRoot, if any, is prepended
    		 *   first.
    		 * - Otherwise aPath is a path. If aRoot is a URL, then its path portion
    		 *   is updated with the result and aRoot is returned. Otherwise the result
    		 *   is returned.
    		 *   - If aPath is absolute, the result is aPath.
    		 *   - Otherwise the two paths are joined with a slash.
    		 * - Joining for example 'http://' and 'www.example.com' is also supported.
    		 */
    		function join(aRoot, aPath) {
    		  if (aRoot === "") {
    		    aRoot = ".";
    		  }
    		  if (aPath === "") {
    		    aPath = ".";
    		  }
    		  const aPathUrl = urlParse(aPath);
    		  const aRootUrl = urlParse(aRoot);
    		  if (aRootUrl) {
    		    aRoot = aRootUrl.path || "/";
    		  }

    		  // `join(foo, '//www.example.org')`
    		  if (aPathUrl && !aPathUrl.scheme) {
    		    if (aRootUrl) {
    		      aPathUrl.scheme = aRootUrl.scheme;
    		    }
    		    return urlGenerate(aPathUrl);
    		  }

    		  if (aPathUrl || aPath.match(dataUrlRegexp)) {
    		    return aPath;
    		  }

    		  // `join('http://', 'www.example.com')`
    		  if (aRootUrl && !aRootUrl.host && !aRootUrl.path) {
    		    aRootUrl.host = aPath;
    		    return urlGenerate(aRootUrl);
    		  }

    		  const joined = aPath.charAt(0) === "/"
    		    ? aPath
    		    : normalize(aRoot.replace(/\/+$/, "") + "/" + aPath);

    		  if (aRootUrl) {
    		    aRootUrl.path = joined;
    		    return urlGenerate(aRootUrl);
    		  }
    		  return joined;
    		}
    		exports.join = join;

    		exports.isAbsolute = function(aPath) {
    		  return aPath.charAt(0) === "/" || urlRegexp.test(aPath);
    		};

    		/**
    		 * Make a path relative to a URL or another path.
    		 *
    		 * @param aRoot The root path or URL.
    		 * @param aPath The path or URL to be made relative to aRoot.
    		 */
    		function relative(aRoot, aPath) {
    		  if (aRoot === "") {
    		    aRoot = ".";
    		  }

    		  aRoot = aRoot.replace(/\/$/, "");

    		  // It is possible for the path to be above the root. In this case, simply
    		  // checking whether the root is a prefix of the path won't work. Instead, we
    		  // need to remove components from the root one by one, until either we find
    		  // a prefix that fits, or we run out of components to remove.
    		  let level = 0;
    		  while (aPath.indexOf(aRoot + "/") !== 0) {
    		    const index = aRoot.lastIndexOf("/");
    		    if (index < 0) {
    		      return aPath;
    		    }

    		    // If the only part of the root that is left is the scheme (i.e. http://,
    		    // file:///, etc.), one or more slashes (/), or simply nothing at all, we
    		    // have exhausted all components, so the path is not relative to the root.
    		    aRoot = aRoot.slice(0, index);
    		    if (aRoot.match(/^([^\/]+:\/)?\/*$/)) {
    		      return aPath;
    		    }

    		    ++level;
    		  }

    		  // Make sure we add a "../" for each component we removed from the root.
    		  return Array(level + 1).join("../") + aPath.substr(aRoot.length + 1);
    		}
    		exports.relative = relative;

    		const supportsNullProto = (function() {
    		  const obj = Object.create(null);
    		  return !("__proto__" in obj);
    		}());

    		function identity(s) {
    		  return s;
    		}

    		/**
    		 * Because behavior goes wacky when you set `__proto__` on objects, we
    		 * have to prefix all the strings in our set with an arbitrary character.
    		 *
    		 * See https://github.com/mozilla/source-map/pull/31 and
    		 * https://github.com/mozilla/source-map/issues/30
    		 *
    		 * @param String aStr
    		 */
    		function toSetString(aStr) {
    		  if (isProtoString(aStr)) {
    		    return "$" + aStr;
    		  }

    		  return aStr;
    		}
    		exports.toSetString = supportsNullProto ? identity : toSetString;

    		function fromSetString(aStr) {
    		  if (isProtoString(aStr)) {
    		    return aStr.slice(1);
    		  }

    		  return aStr;
    		}
    		exports.fromSetString = supportsNullProto ? identity : fromSetString;

    		function isProtoString(s) {
    		  if (!s) {
    		    return false;
    		  }

    		  const length = s.length;

    		  if (length < 9 /* "__proto__".length */) {
    		    return false;
    		  }

    		  /* eslint-disable no-multi-spaces */
    		  if (s.charCodeAt(length - 1) !== 95  /* '_' */ ||
    		      s.charCodeAt(length - 2) !== 95  /* '_' */ ||
    		      s.charCodeAt(length - 3) !== 111 /* 'o' */ ||
    		      s.charCodeAt(length - 4) !== 116 /* 't' */ ||
    		      s.charCodeAt(length - 5) !== 111 /* 'o' */ ||
    		      s.charCodeAt(length - 6) !== 114 /* 'r' */ ||
    		      s.charCodeAt(length - 7) !== 112 /* 'p' */ ||
    		      s.charCodeAt(length - 8) !== 95  /* '_' */ ||
    		      s.charCodeAt(length - 9) !== 95  /* '_' */) {
    		    return false;
    		  }
    		  /* eslint-enable no-multi-spaces */

    		  for (let i = length - 10; i >= 0; i--) {
    		    if (s.charCodeAt(i) !== 36 /* '$' */) {
    		      return false;
    		    }
    		  }

    		  return true;
    		}

    		/**
    		 * Comparator between two mappings where the original positions are compared.
    		 *
    		 * Optionally pass in `true` as `onlyCompareGenerated` to consider two
    		 * mappings with the same original source/line/column, but different generated
    		 * line and column the same. Useful when searching for a mapping with a
    		 * stubbed out mapping.
    		 */
    		function compareByOriginalPositions(mappingA, mappingB, onlyCompareOriginal) {
    		  let cmp = strcmp(mappingA.source, mappingB.source);
    		  if (cmp !== 0) {
    		    return cmp;
    		  }

    		  cmp = mappingA.originalLine - mappingB.originalLine;
    		  if (cmp !== 0) {
    		    return cmp;
    		  }

    		  cmp = mappingA.originalColumn - mappingB.originalColumn;
    		  if (cmp !== 0 || onlyCompareOriginal) {
    		    return cmp;
    		  }

    		  cmp = mappingA.generatedColumn - mappingB.generatedColumn;
    		  if (cmp !== 0) {
    		    return cmp;
    		  }

    		  cmp = mappingA.generatedLine - mappingB.generatedLine;
    		  if (cmp !== 0) {
    		    return cmp;
    		  }

    		  return strcmp(mappingA.name, mappingB.name);
    		}
    		exports.compareByOriginalPositions = compareByOriginalPositions;

    		/**
    		 * Comparator between two mappings with deflated source and name indices where
    		 * the generated positions are compared.
    		 *
    		 * Optionally pass in `true` as `onlyCompareGenerated` to consider two
    		 * mappings with the same generated line and column, but different
    		 * source/name/original line and column the same. Useful when searching for a
    		 * mapping with a stubbed out mapping.
    		 */
    		function compareByGeneratedPositionsDeflated(mappingA, mappingB, onlyCompareGenerated) {
    		  let cmp = mappingA.generatedLine - mappingB.generatedLine;
    		  if (cmp !== 0) {
    		    return cmp;
    		  }

    		  cmp = mappingA.generatedColumn - mappingB.generatedColumn;
    		  if (cmp !== 0 || onlyCompareGenerated) {
    		    return cmp;
    		  }

    		  cmp = strcmp(mappingA.source, mappingB.source);
    		  if (cmp !== 0) {
    		    return cmp;
    		  }

    		  cmp = mappingA.originalLine - mappingB.originalLine;
    		  if (cmp !== 0) {
    		    return cmp;
    		  }

    		  cmp = mappingA.originalColumn - mappingB.originalColumn;
    		  if (cmp !== 0) {
    		    return cmp;
    		  }

    		  return strcmp(mappingA.name, mappingB.name);
    		}
    		exports.compareByGeneratedPositionsDeflated = compareByGeneratedPositionsDeflated;

    		function strcmp(aStr1, aStr2) {
    		  if (aStr1 === aStr2) {
    		    return 0;
    		  }

    		  if (aStr1 === null) {
    		    return 1; // aStr2 !== null
    		  }

    		  if (aStr2 === null) {
    		    return -1; // aStr1 !== null
    		  }

    		  if (aStr1 > aStr2) {
    		    return 1;
    		  }

    		  return -1;
    		}

    		/**
    		 * Comparator between two mappings with inflated source and name strings where
    		 * the generated positions are compared.
    		 */
    		function compareByGeneratedPositionsInflated(mappingA, mappingB) {
    		  let cmp = mappingA.generatedLine - mappingB.generatedLine;
    		  if (cmp !== 0) {
    		    return cmp;
    		  }

    		  cmp = mappingA.generatedColumn - mappingB.generatedColumn;
    		  if (cmp !== 0) {
    		    return cmp;
    		  }

    		  cmp = strcmp(mappingA.source, mappingB.source);
    		  if (cmp !== 0) {
    		    return cmp;
    		  }

    		  cmp = mappingA.originalLine - mappingB.originalLine;
    		  if (cmp !== 0) {
    		    return cmp;
    		  }

    		  cmp = mappingA.originalColumn - mappingB.originalColumn;
    		  if (cmp !== 0) {
    		    return cmp;
    		  }

    		  return strcmp(mappingA.name, mappingB.name);
    		}
    		exports.compareByGeneratedPositionsInflated = compareByGeneratedPositionsInflated;

    		/**
    		 * Strip any JSON XSSI avoidance prefix from the string (as documented
    		 * in the source maps specification), and then parse the string as
    		 * JSON.
    		 */
    		function parseSourceMapInput(str) {
    		  return JSON.parse(str.replace(/^\)]}'[^\n]*\n/, ""));
    		}
    		exports.parseSourceMapInput = parseSourceMapInput;

    		/**
    		 * Compute the URL of a source given the the source root, the source's
    		 * URL, and the source map's URL.
    		 */
    		function computeSourceURL(sourceRoot, sourceURL, sourceMapURL) {
    		  sourceURL = sourceURL || "";

    		  if (sourceRoot) {
    		    // This follows what Chrome does.
    		    if (sourceRoot[sourceRoot.length - 1] !== "/" && sourceURL[0] !== "/") {
    		      sourceRoot += "/";
    		    }
    		    // The spec says:
    		    //   Line 4: An optional source root, useful for relocating source
    		    //   files on a server or removing repeated values in the
    		    //   “sources” entry.  This value is prepended to the individual
    		    //   entries in the “source” field.
    		    sourceURL = sourceRoot + sourceURL;
    		  }

    		  // Historically, SourceMapConsumer did not take the sourceMapURL as
    		  // a parameter.  This mode is still somewhat supported, which is why
    		  // this code block is conditional.  However, it's preferable to pass
    		  // the source map URL to SourceMapConsumer, so that this function
    		  // can implement the source URL resolution algorithm as outlined in
    		  // the spec.  This block is basically the equivalent of:
    		  //    new URL(sourceURL, sourceMapURL).toString()
    		  // ... except it avoids using URL, which wasn't available in the
    		  // older releases of node still supported by this library.
    		  //
    		  // The spec says:
    		  //   If the sources are not absolute URLs after prepending of the
    		  //   “sourceRoot”, the sources are resolved relative to the
    		  //   SourceMap (like resolving script src in a html document).
    		  if (sourceMapURL) {
    		    const parsed = urlParse(sourceMapURL);
    		    if (!parsed) {
    		      throw new Error("sourceMapURL could not be parsed");
    		    }
    		    if (parsed.path) {
    		      // Strip the last path component, but keep the "/".
    		      const index = parsed.path.lastIndexOf("/");
    		      if (index >= 0) {
    		        parsed.path = parsed.path.substring(0, index + 1);
    		      }
    		    }
    		    sourceURL = join(urlGenerate(parsed), sourceURL);
    		  }

    		  return normalize(sourceURL);
    		}
    		exports.computeSourceURL = computeSourceURL; 
    	} (util));
    	return util;
    }

    var arraySet = {};

    var hasRequiredArraySet;

    function requireArraySet () {
    	if (hasRequiredArraySet) return arraySet;
    	hasRequiredArraySet = 1;
    	/*
    	 * Copyright 2011 Mozilla Foundation and contributors
    	 * Licensed under the New BSD license. See LICENSE or:
    	 * http://opensource.org/licenses/BSD-3-Clause
    	 */

    	/**
    	 * A data structure which is a combination of an array and a set. Adding a new
    	 * member is O(1), testing for membership is O(1), and finding the index of an
    	 * element is O(1). Removing elements from the set is not supported. Only
    	 * strings are supported for membership.
    	 */
    	class ArraySet {
    	  constructor() {
    	    this._array = [];
    	    this._set = new Map();
    	  }

    	  /**
    	   * Static method for creating ArraySet instances from an existing array.
    	   */
    	  static fromArray(aArray, aAllowDuplicates) {
    	    const set = new ArraySet();
    	    for (let i = 0, len = aArray.length; i < len; i++) {
    	      set.add(aArray[i], aAllowDuplicates);
    	    }
    	    return set;
    	  }

    	  /**
    	   * Return how many unique items are in this ArraySet. If duplicates have been
    	   * added, than those do not count towards the size.
    	   *
    	   * @returns Number
    	   */
    	  size() {
    	    return this._set.size;
    	  }

    	  /**
    	   * Add the given string to this set.
    	   *
    	   * @param String aStr
    	   */
    	  add(aStr, aAllowDuplicates) {
    	    const isDuplicate = this.has(aStr);
    	    const idx = this._array.length;
    	    if (!isDuplicate || aAllowDuplicates) {
    	      this._array.push(aStr);
    	    }
    	    if (!isDuplicate) {
    	      this._set.set(aStr, idx);
    	    }
    	  }

    	  /**
    	   * Is the given string a member of this set?
    	   *
    	   * @param String aStr
    	   */
    	  has(aStr) {
    	      return this._set.has(aStr);
    	  }

    	  /**
    	   * What is the index of the given string in the array?
    	   *
    	   * @param String aStr
    	   */
    	  indexOf(aStr) {
    	    const idx = this._set.get(aStr);
    	    if (idx >= 0) {
    	        return idx;
    	    }
    	    throw new Error('"' + aStr + '" is not in the set.');
    	  }

    	  /**
    	   * What is the element at the given index?
    	   *
    	   * @param Number aIdx
    	   */
    	  at(aIdx) {
    	    if (aIdx >= 0 && aIdx < this._array.length) {
    	      return this._array[aIdx];
    	    }
    	    throw new Error("No element indexed by " + aIdx);
    	  }

    	  /**
    	   * Returns the array representation of this set (which has the proper indices
    	   * indicated by indexOf). Note that this is a copy of the internal array used
    	   * for storing the members so that no one can mess with internal state.
    	   */
    	  toArray() {
    	    return this._array.slice();
    	  }
    	}
    	arraySet.ArraySet = ArraySet;
    	return arraySet;
    }

    var mappingList = {};

    var hasRequiredMappingList;

    function requireMappingList () {
    	if (hasRequiredMappingList) return mappingList;
    	hasRequiredMappingList = 1;
    	/*
    	 * Copyright 2014 Mozilla Foundation and contributors
    	 * Licensed under the New BSD license. See LICENSE or:
    	 * http://opensource.org/licenses/BSD-3-Clause
    	 */

    	const util = requireUtil();

    	/**
    	 * Determine whether mappingB is after mappingA with respect to generated
    	 * position.
    	 */
    	function generatedPositionAfter(mappingA, mappingB) {
    	  // Optimized for most common case
    	  const lineA = mappingA.generatedLine;
    	  const lineB = mappingB.generatedLine;
    	  const columnA = mappingA.generatedColumn;
    	  const columnB = mappingB.generatedColumn;
    	  return lineB > lineA || lineB == lineA && columnB >= columnA ||
    	         util.compareByGeneratedPositionsInflated(mappingA, mappingB) <= 0;
    	}

    	/**
    	 * A data structure to provide a sorted view of accumulated mappings in a
    	 * performance conscious manner. It trades a negligible overhead in general
    	 * case for a large speedup in case of mappings being added in order.
    	 */
    	class MappingList {
    	  constructor() {
    	    this._array = [];
    	    this._sorted = true;
    	    // Serves as infimum
    	    this._last = {generatedLine: -1, generatedColumn: 0};
    	  }

    	  /**
    	   * Iterate through internal items. This method takes the same arguments that
    	   * `Array.prototype.forEach` takes.
    	   *
    	   * NOTE: The order of the mappings is NOT guaranteed.
    	   */
    	  unsortedForEach(aCallback, aThisArg) {
    	    this._array.forEach(aCallback, aThisArg);
    	  }

    	  /**
    	   * Add the given source mapping.
    	   *
    	   * @param Object aMapping
    	   */
    	  add(aMapping) {
    	    if (generatedPositionAfter(this._last, aMapping)) {
    	      this._last = aMapping;
    	      this._array.push(aMapping);
    	    } else {
    	      this._sorted = false;
    	      this._array.push(aMapping);
    	    }
    	  }

    	  /**
    	   * Returns the flat, sorted array of mappings. The mappings are sorted by
    	   * generated position.
    	   *
    	   * WARNING: This method returns internal data without copying, for
    	   * performance. The return value must NOT be mutated, and should be treated as
    	   * an immutable borrow. If you want to take ownership, you must make your own
    	   * copy.
    	   */
    	  toArray() {
    	    if (!this._sorted) {
    	      this._array.sort(util.compareByGeneratedPositionsInflated);
    	      this._sorted = true;
    	    }
    	    return this._array;
    	  }
    	}

    	mappingList.MappingList = MappingList;
    	return mappingList;
    }

    var hasRequiredSourceMapGenerator;

    function requireSourceMapGenerator () {
    	if (hasRequiredSourceMapGenerator) return sourceMapGenerator;
    	hasRequiredSourceMapGenerator = 1;
    	/*
    	 * Copyright 2011 Mozilla Foundation and contributors
    	 * Licensed under the New BSD license. See LICENSE or:
    	 * http://opensource.org/licenses/BSD-3-Clause
    	 */

    	const base64VLQ = requireBase64Vlq();
    	const util = requireUtil();
    	const ArraySet = requireArraySet().ArraySet;
    	const MappingList = requireMappingList().MappingList;

    	/**
    	 * An instance of the SourceMapGenerator represents a source map which is
    	 * being built incrementally. You may pass an object with the following
    	 * properties:
    	 *
    	 *   - file: The filename of the generated source.
    	 *   - sourceRoot: A root for all relative URLs in this source map.
    	 */
    	class SourceMapGenerator {
    	  constructor(aArgs) {
    	    if (!aArgs) {
    	      aArgs = {};
    	    }
    	    this._file = util.getArg(aArgs, "file", null);
    	    this._sourceRoot = util.getArg(aArgs, "sourceRoot", null);
    	    this._skipValidation = util.getArg(aArgs, "skipValidation", false);
    	    this._sources = new ArraySet();
    	    this._names = new ArraySet();
    	    this._mappings = new MappingList();
    	    this._sourcesContents = null;
    	  }

    	  /**
    	   * Creates a new SourceMapGenerator based on a SourceMapConsumer
    	   *
    	   * @param aSourceMapConsumer The SourceMap.
    	   */
    	  static fromSourceMap(aSourceMapConsumer) {
    	    const sourceRoot = aSourceMapConsumer.sourceRoot;
    	    const generator = new SourceMapGenerator({
    	      file: aSourceMapConsumer.file,
    	      sourceRoot
    	    });
    	    aSourceMapConsumer.eachMapping(function(mapping) {
    	      const newMapping = {
    	        generated: {
    	          line: mapping.generatedLine,
    	          column: mapping.generatedColumn
    	        }
    	      };

    	      if (mapping.source != null) {
    	        newMapping.source = mapping.source;
    	        if (sourceRoot != null) {
    	          newMapping.source = util.relative(sourceRoot, newMapping.source);
    	        }

    	        newMapping.original = {
    	          line: mapping.originalLine,
    	          column: mapping.originalColumn
    	        };

    	        if (mapping.name != null) {
    	          newMapping.name = mapping.name;
    	        }
    	      }

    	      generator.addMapping(newMapping);
    	    });
    	    aSourceMapConsumer.sources.forEach(function(sourceFile) {
    	      let sourceRelative = sourceFile;
    	      if (sourceRoot !== null) {
    	        sourceRelative = util.relative(sourceRoot, sourceFile);
    	      }

    	      if (!generator._sources.has(sourceRelative)) {
    	        generator._sources.add(sourceRelative);
    	      }

    	      const content = aSourceMapConsumer.sourceContentFor(sourceFile);
    	      if (content != null) {
    	        generator.setSourceContent(sourceFile, content);
    	      }
    	    });
    	    return generator;
    	  }

    	  /**
    	   * Add a single mapping from original source line and column to the generated
    	   * source's line and column for this source map being created. The mapping
    	   * object should have the following properties:
    	   *
    	   *   - generated: An object with the generated line and column positions.
    	   *   - original: An object with the original line and column positions.
    	   *   - source: The original source file (relative to the sourceRoot).
    	   *   - name: An optional original token name for this mapping.
    	   */
    	  addMapping(aArgs) {
    	    const generated = util.getArg(aArgs, "generated");
    	    const original = util.getArg(aArgs, "original", null);
    	    let source = util.getArg(aArgs, "source", null);
    	    let name = util.getArg(aArgs, "name", null);

    	    if (!this._skipValidation) {
    	      this._validateMapping(generated, original, source, name);
    	    }

    	    if (source != null) {
    	      source = String(source);
    	      if (!this._sources.has(source)) {
    	        this._sources.add(source);
    	      }
    	    }

    	    if (name != null) {
    	      name = String(name);
    	      if (!this._names.has(name)) {
    	        this._names.add(name);
    	      }
    	    }

    	    this._mappings.add({
    	      generatedLine: generated.line,
    	      generatedColumn: generated.column,
    	      originalLine: original != null && original.line,
    	      originalColumn: original != null && original.column,
    	      source,
    	      name
    	    });
    	  }

    	  /**
    	   * Set the source content for a source file.
    	   */
    	  setSourceContent(aSourceFile, aSourceContent) {
    	    let source = aSourceFile;
    	    if (this._sourceRoot != null) {
    	      source = util.relative(this._sourceRoot, source);
    	    }

    	    if (aSourceContent != null) {
    	      // Add the source content to the _sourcesContents map.
    	      // Create a new _sourcesContents map if the property is null.
    	      if (!this._sourcesContents) {
    	        this._sourcesContents = Object.create(null);
    	      }
    	      this._sourcesContents[util.toSetString(source)] = aSourceContent;
    	    } else if (this._sourcesContents) {
    	      // Remove the source file from the _sourcesContents map.
    	      // If the _sourcesContents map is empty, set the property to null.
    	      delete this._sourcesContents[util.toSetString(source)];
    	      if (Object.keys(this._sourcesContents).length === 0) {
    	        this._sourcesContents = null;
    	      }
    	    }
    	  }

    	  /**
    	   * Applies the mappings of a sub-source-map for a specific source file to the
    	   * source map being generated. Each mapping to the supplied source file is
    	   * rewritten using the supplied source map. Note: The resolution for the
    	   * resulting mappings is the minimium of this map and the supplied map.
    	   *
    	   * @param aSourceMapConsumer The source map to be applied.
    	   * @param aSourceFile Optional. The filename of the source file.
    	   *        If omitted, SourceMapConsumer's file property will be used.
    	   * @param aSourceMapPath Optional. The dirname of the path to the source map
    	   *        to be applied. If relative, it is relative to the SourceMapConsumer.
    	   *        This parameter is needed when the two source maps aren't in the same
    	   *        directory, and the source map to be applied contains relative source
    	   *        paths. If so, those relative source paths need to be rewritten
    	   *        relative to the SourceMapGenerator.
    	   */
    	  applySourceMap(aSourceMapConsumer, aSourceFile, aSourceMapPath) {
    	    let sourceFile = aSourceFile;
    	    // If aSourceFile is omitted, we will use the file property of the SourceMap
    	    if (aSourceFile == null) {
    	      if (aSourceMapConsumer.file == null) {
    	        throw new Error(
    	          "SourceMapGenerator.prototype.applySourceMap requires either an explicit source file, " +
    	          'or the source map\'s "file" property. Both were omitted.'
    	        );
    	      }
    	      sourceFile = aSourceMapConsumer.file;
    	    }
    	    const sourceRoot = this._sourceRoot;
    	    // Make "sourceFile" relative if an absolute Url is passed.
    	    if (sourceRoot != null) {
    	      sourceFile = util.relative(sourceRoot, sourceFile);
    	    }
    	    // Applying the SourceMap can add and remove items from the sources and
    	    // the names array.
    	    const newSources = this._mappings.toArray().length > 0
    	      ? new ArraySet()
    	      : this._sources;
    	    const newNames = new ArraySet();

    	    // Find mappings for the "sourceFile"
    	    this._mappings.unsortedForEach(function(mapping) {
    	      if (mapping.source === sourceFile && mapping.originalLine != null) {
    	        // Check if it can be mapped by the source map, then update the mapping.
    	        const original = aSourceMapConsumer.originalPositionFor({
    	          line: mapping.originalLine,
    	          column: mapping.originalColumn
    	        });
    	        if (original.source != null) {
    	          // Copy mapping
    	          mapping.source = original.source;
    	          if (aSourceMapPath != null) {
    	            mapping.source = util.join(aSourceMapPath, mapping.source);
    	          }
    	          if (sourceRoot != null) {
    	            mapping.source = util.relative(sourceRoot, mapping.source);
    	          }
    	          mapping.originalLine = original.line;
    	          mapping.originalColumn = original.column;
    	          if (original.name != null) {
    	            mapping.name = original.name;
    	          }
    	        }
    	      }

    	      const source = mapping.source;
    	      if (source != null && !newSources.has(source)) {
    	        newSources.add(source);
    	      }

    	      const name = mapping.name;
    	      if (name != null && !newNames.has(name)) {
    	        newNames.add(name);
    	      }

    	    }, this);
    	    this._sources = newSources;
    	    this._names = newNames;

    	    // Copy sourcesContents of applied map.
    	    aSourceMapConsumer.sources.forEach(function(srcFile) {
    	      const content = aSourceMapConsumer.sourceContentFor(srcFile);
    	      if (content != null) {
    	        if (aSourceMapPath != null) {
    	          srcFile = util.join(aSourceMapPath, srcFile);
    	        }
    	        if (sourceRoot != null) {
    	          srcFile = util.relative(sourceRoot, srcFile);
    	        }
    	        this.setSourceContent(srcFile, content);
    	      }
    	    }, this);
    	  }

    	  /**
    	   * A mapping can have one of the three levels of data:
    	   *
    	   *   1. Just the generated position.
    	   *   2. The Generated position, original position, and original source.
    	   *   3. Generated and original position, original source, as well as a name
    	   *      token.
    	   *
    	   * To maintain consistency, we validate that any new mapping being added falls
    	   * in to one of these categories.
    	   */
    	  _validateMapping(aGenerated, aOriginal, aSource, aName) {
    	    // When aOriginal is truthy but has empty values for .line and .column,
    	    // it is most likely a programmer error. In this case we throw a very
    	    // specific error message to try to guide them the right way.
    	    // For example: https://github.com/Polymer/polymer-bundler/pull/519
    	    if (aOriginal && typeof aOriginal.line !== "number" && typeof aOriginal.column !== "number") {
    	        throw new Error(
    	            "original.line and original.column are not numbers -- you probably meant to omit " +
    	            "the original mapping entirely and only map the generated position. If so, pass " +
    	            "null for the original mapping instead of an object with empty or null values."
    	        );
    	    }

    	    if (aGenerated && "line" in aGenerated && "column" in aGenerated
    	        && aGenerated.line > 0 && aGenerated.column >= 0
    	        && !aOriginal && !aSource && !aName) ; else if (aGenerated && "line" in aGenerated && "column" in aGenerated
    	             && aOriginal && "line" in aOriginal && "column" in aOriginal
    	             && aGenerated.line > 0 && aGenerated.column >= 0
    	             && aOriginal.line > 0 && aOriginal.column >= 0
    	             && aSource) ; else {
    	      throw new Error("Invalid mapping: " + JSON.stringify({
    	        generated: aGenerated,
    	        source: aSource,
    	        original: aOriginal,
    	        name: aName
    	      }));
    	    }
    	  }

    	  /**
    	   * Serialize the accumulated mappings in to the stream of base 64 VLQs
    	   * specified by the source map format.
    	   */
    	  _serializeMappings() {
    	    let previousGeneratedColumn = 0;
    	    let previousGeneratedLine = 1;
    	    let previousOriginalColumn = 0;
    	    let previousOriginalLine = 0;
    	    let previousName = 0;
    	    let previousSource = 0;
    	    let result = "";
    	    let next;
    	    let mapping;
    	    let nameIdx;
    	    let sourceIdx;

    	    const mappings = this._mappings.toArray();
    	    for (let i = 0, len = mappings.length; i < len; i++) {
    	      mapping = mappings[i];
    	      next = "";

    	      if (mapping.generatedLine !== previousGeneratedLine) {
    	        previousGeneratedColumn = 0;
    	        while (mapping.generatedLine !== previousGeneratedLine) {
    	          next += ";";
    	          previousGeneratedLine++;
    	        }
    	      } else if (i > 0) {
    	        if (!util.compareByGeneratedPositionsInflated(mapping, mappings[i - 1])) {
    	          continue;
    	        }
    	        next += ",";
    	      }

    	      next += base64VLQ.encode(mapping.generatedColumn
    	                                 - previousGeneratedColumn);
    	      previousGeneratedColumn = mapping.generatedColumn;

    	      if (mapping.source != null) {
    	        sourceIdx = this._sources.indexOf(mapping.source);
    	        next += base64VLQ.encode(sourceIdx - previousSource);
    	        previousSource = sourceIdx;

    	        // lines are stored 0-based in SourceMap spec version 3
    	        next += base64VLQ.encode(mapping.originalLine - 1
    	                                   - previousOriginalLine);
    	        previousOriginalLine = mapping.originalLine - 1;

    	        next += base64VLQ.encode(mapping.originalColumn
    	                                   - previousOriginalColumn);
    	        previousOriginalColumn = mapping.originalColumn;

    	        if (mapping.name != null) {
    	          nameIdx = this._names.indexOf(mapping.name);
    	          next += base64VLQ.encode(nameIdx - previousName);
    	          previousName = nameIdx;
    	        }
    	      }

    	      result += next;
    	    }

    	    return result;
    	  }

    	  _generateSourcesContent(aSources, aSourceRoot) {
    	    return aSources.map(function(source) {
    	      if (!this._sourcesContents) {
    	        return null;
    	      }
    	      if (aSourceRoot != null) {
    	        source = util.relative(aSourceRoot, source);
    	      }
    	      const key = util.toSetString(source);
    	      return Object.prototype.hasOwnProperty.call(this._sourcesContents, key)
    	        ? this._sourcesContents[key]
    	        : null;
    	    }, this);
    	  }

    	  /**
    	   * Externalize the source map.
    	   */
    	  toJSON() {
    	    const map = {
    	      version: this._version,
    	      sources: this._sources.toArray(),
    	      names: this._names.toArray(),
    	      mappings: this._serializeMappings()
    	    };
    	    if (this._file != null) {
    	      map.file = this._file;
    	    }
    	    if (this._sourceRoot != null) {
    	      map.sourceRoot = this._sourceRoot;
    	    }
    	    if (this._sourcesContents) {
    	      map.sourcesContent = this._generateSourcesContent(map.sources, map.sourceRoot);
    	    }

    	    return map;
    	  }

    	  /**
    	   * Render the source map being generated to a string.
    	   */
    	  toString() {
    	    return JSON.stringify(this.toJSON());
    	  }
    	}

    	SourceMapGenerator.prototype._version = 3;
    	sourceMapGenerator.SourceMapGenerator = SourceMapGenerator;
    	return sourceMapGenerator;
    }

    var sourceMapConsumer = {};

    var binarySearch = {};

    var hasRequiredBinarySearch;

    function requireBinarySearch () {
    	if (hasRequiredBinarySearch) return binarySearch;
    	hasRequiredBinarySearch = 1;
    	(function (exports) {
    		/*
    		 * Copyright 2011 Mozilla Foundation and contributors
    		 * Licensed under the New BSD license. See LICENSE or:
    		 * http://opensource.org/licenses/BSD-3-Clause
    		 */

    		exports.GREATEST_LOWER_BOUND = 1;
    		exports.LEAST_UPPER_BOUND = 2;

    		/**
    		 * Recursive implementation of binary search.
    		 *
    		 * @param aLow Indices here and lower do not contain the needle.
    		 * @param aHigh Indices here and higher do not contain the needle.
    		 * @param aNeedle The element being searched for.
    		 * @param aHaystack The non-empty array being searched.
    		 * @param aCompare Function which takes two elements and returns -1, 0, or 1.
    		 * @param aBias Either 'binarySearch.GREATEST_LOWER_BOUND' or
    		 *     'binarySearch.LEAST_UPPER_BOUND'. Specifies whether to return the
    		 *     closest element that is smaller than or greater than the one we are
    		 *     searching for, respectively, if the exact element cannot be found.
    		 */
    		function recursiveSearch(aLow, aHigh, aNeedle, aHaystack, aCompare, aBias) {
    		  // This function terminates when one of the following is true:
    		  //
    		  //   1. We find the exact element we are looking for.
    		  //
    		  //   2. We did not find the exact element, but we can return the index of
    		  //      the next-closest element.
    		  //
    		  //   3. We did not find the exact element, and there is no next-closest
    		  //      element than the one we are searching for, so we return -1.
    		  const mid = Math.floor((aHigh - aLow) / 2) + aLow;
    		  const cmp = aCompare(aNeedle, aHaystack[mid], true);
    		  if (cmp === 0) {
    		    // Found the element we are looking for.
    		    return mid;
    		  } else if (cmp > 0) {
    		    // Our needle is greater than aHaystack[mid].
    		    if (aHigh - mid > 1) {
    		      // The element is in the upper half.
    		      return recursiveSearch(mid, aHigh, aNeedle, aHaystack, aCompare, aBias);
    		    }

    		    // The exact needle element was not found in this haystack. Determine if
    		    // we are in termination case (3) or (2) and return the appropriate thing.
    		    if (aBias == exports.LEAST_UPPER_BOUND) {
    		      return aHigh < aHaystack.length ? aHigh : -1;
    		    }
    		    return mid;
    		  }

    		  // Our needle is less than aHaystack[mid].
    		  if (mid - aLow > 1) {
    		    // The element is in the lower half.
    		    return recursiveSearch(aLow, mid, aNeedle, aHaystack, aCompare, aBias);
    		  }

    		  // we are in termination case (3) or (2) and return the appropriate thing.
    		  if (aBias == exports.LEAST_UPPER_BOUND) {
    		    return mid;
    		  }
    		  return aLow < 0 ? -1 : aLow;
    		}

    		/**
    		 * This is an implementation of binary search which will always try and return
    		 * the index of the closest element if there is no exact hit. This is because
    		 * mappings between original and generated line/col pairs are single points,
    		 * and there is an implicit region between each of them, so a miss just means
    		 * that you aren't on the very start of a region.
    		 *
    		 * @param aNeedle The element you are looking for.
    		 * @param aHaystack The array that is being searched.
    		 * @param aCompare A function which takes the needle and an element in the
    		 *     array and returns -1, 0, or 1 depending on whether the needle is less
    		 *     than, equal to, or greater than the element, respectively.
    		 * @param aBias Either 'binarySearch.GREATEST_LOWER_BOUND' or
    		 *     'binarySearch.LEAST_UPPER_BOUND'. Specifies whether to return the
    		 *     closest element that is smaller than or greater than the one we are
    		 *     searching for, respectively, if the exact element cannot be found.
    		 *     Defaults to 'binarySearch.GREATEST_LOWER_BOUND'.
    		 */
    		exports.search = function search(aNeedle, aHaystack, aCompare, aBias) {
    		  if (aHaystack.length === 0) {
    		    return -1;
    		  }

    		  let index = recursiveSearch(-1, aHaystack.length, aNeedle, aHaystack,
    		                              aCompare, aBias || exports.GREATEST_LOWER_BOUND);
    		  if (index < 0) {
    		    return -1;
    		  }

    		  // We have found either the exact element, or the next-closest element than
    		  // the one we are searching for. However, there may be more than one such
    		  // element. Make sure we always return the smallest of these.
    		  while (index - 1 >= 0) {
    		    if (aCompare(aHaystack[index], aHaystack[index - 1], true) !== 0) {
    		      break;
    		    }
    		    --index;
    		  }

    		  return index;
    		}; 
    	} (binarySearch));
    	return binarySearch;
    }

    var readWasm = {exports: {}};

    var empty = {};

    var empty$1 = /*#__PURE__*/Object.freeze({
        __proto__: null,
        default: empty
    });

    var require$$0 = /*@__PURE__*/getAugmentedNamespace(empty$1);

    // Copyright Joyent, Inc. and other Node contributors.
    //
    // Permission is hereby granted, free of charge, to any person obtaining a
    // copy of this software and associated documentation files (the
    // "Software"), to deal in the Software without restriction, including
    // without limitation the rights to use, copy, modify, merge, publish,
    // distribute, sublicense, and/or sell copies of the Software, and to permit
    // persons to whom the Software is furnished to do so, subject to the
    // following conditions:
    //
    // The above copyright notice and this permission notice shall be included
    // in all copies or substantial portions of the Software.
    //
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
    // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
    // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
    // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
    // USE OR OTHER DEALINGS IN THE SOFTWARE.

    // resolves . and .. elements in a path array with directory names there
    // must be no slashes, empty elements, or device names (c:\) in the array
    // (so also no leading and trailing slashes - it does not distinguish
    // relative and absolute paths)
    function normalizeArray(parts, allowAboveRoot) {
      // if the path tries to go above the root, `up` ends up > 0
      var up = 0;
      for (var i = parts.length - 1; i >= 0; i--) {
        var last = parts[i];
        if (last === '.') {
          parts.splice(i, 1);
        } else if (last === '..') {
          parts.splice(i, 1);
          up++;
        } else if (up) {
          parts.splice(i, 1);
          up--;
        }
      }

      // if the path is allowed to go above the root, restore leading ..s
      if (allowAboveRoot) {
        for (; up--; up) {
          parts.unshift('..');
        }
      }

      return parts;
    }

    // Split a filename into [root, dir, basename, ext], unix version
    // 'root' is just a slash, or nothing.
    var splitPathRe =
        /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;
    var splitPath = function(filename) {
      return splitPathRe.exec(filename).slice(1);
    };

    // path.resolve([from ...], to)
    // posix version
    function resolve() {
      var resolvedPath = '',
          resolvedAbsolute = false;

      for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
        var path = (i >= 0) ? arguments[i] : '/';

        // Skip empty and invalid entries
        if (typeof path !== 'string') {
          throw new TypeError('Arguments to path.resolve must be strings');
        } else if (!path) {
          continue;
        }

        resolvedPath = path + '/' + resolvedPath;
        resolvedAbsolute = path.charAt(0) === '/';
      }

      // At this point the path should be resolved to a full absolute path, but
      // handle relative paths to be safe (might happen when process.cwd() fails)

      // Normalize the path
      resolvedPath = normalizeArray(filter(resolvedPath.split('/'), function(p) {
        return !!p;
      }), !resolvedAbsolute).join('/');

      return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';
    }
    // path.normalize(path)
    // posix version
    function normalize(path) {
      var isPathAbsolute = isAbsolute(path),
          trailingSlash = substr(path, -1) === '/';

      // Normalize the path
      path = normalizeArray(filter(path.split('/'), function(p) {
        return !!p;
      }), !isPathAbsolute).join('/');

      if (!path && !isPathAbsolute) {
        path = '.';
      }
      if (path && trailingSlash) {
        path += '/';
      }

      return (isPathAbsolute ? '/' : '') + path;
    }
    // posix version
    function isAbsolute(path) {
      return path.charAt(0) === '/';
    }

    // posix version
    function join() {
      var paths = Array.prototype.slice.call(arguments, 0);
      return normalize(filter(paths, function(p, index) {
        if (typeof p !== 'string') {
          throw new TypeError('Arguments to path.join must be strings');
        }
        return p;
      }).join('/'));
    }


    // path.relative(from, to)
    // posix version
    function relative(from, to) {
      from = resolve(from).substr(1);
      to = resolve(to).substr(1);

      function trim(arr) {
        var start = 0;
        for (; start < arr.length; start++) {
          if (arr[start] !== '') break;
        }

        var end = arr.length - 1;
        for (; end >= 0; end--) {
          if (arr[end] !== '') break;
        }

        if (start > end) return [];
        return arr.slice(start, end - start + 1);
      }

      var fromParts = trim(from.split('/'));
      var toParts = trim(to.split('/'));

      var length = Math.min(fromParts.length, toParts.length);
      var samePartsLength = length;
      for (var i = 0; i < length; i++) {
        if (fromParts[i] !== toParts[i]) {
          samePartsLength = i;
          break;
        }
      }

      var outputParts = [];
      for (var i = samePartsLength; i < fromParts.length; i++) {
        outputParts.push('..');
      }

      outputParts = outputParts.concat(toParts.slice(samePartsLength));

      return outputParts.join('/');
    }

    var sep = '/';
    var delimiter = ':';

    function dirname(path) {
      var result = splitPath(path),
          root = result[0],
          dir = result[1];

      if (!root && !dir) {
        // No dirname whatsoever
        return '.';
      }

      if (dir) {
        // It has a dirname, strip trailing slash
        dir = dir.substr(0, dir.length - 1);
      }

      return root + dir;
    }

    function basename(path, ext) {
      var f = splitPath(path)[2];
      // TODO: make this comparison case-insensitive on windows?
      if (ext && f.substr(-1 * ext.length) === ext) {
        f = f.substr(0, f.length - ext.length);
      }
      return f;
    }


    function extname(path) {
      return splitPath(path)[3];
    }
    var path = {
      extname: extname,
      basename: basename,
      dirname: dirname,
      sep: sep,
      delimiter: delimiter,
      relative: relative,
      join: join,
      isAbsolute: isAbsolute,
      normalize: normalize,
      resolve: resolve
    };
    function filter (xs, f) {
        if (xs.filter) return xs.filter(f);
        var res = [];
        for (var i = 0; i < xs.length; i++) {
            if (f(xs[i], i, xs)) res.push(xs[i]);
        }
        return res;
    }

    // String.prototype.substr - negative index don't work in IE8
    var substr = 'ab'.substr(-1) === 'b' ?
        function (str, start, len) { return str.substr(start, len) } :
        function (str, start, len) {
            if (start < 0) start = str.length + start;
            return str.substr(start, len);
        }
    ;

    var path$1 = /*#__PURE__*/Object.freeze({
        __proto__: null,
        basename: basename,
        default: path,
        delimiter: delimiter,
        dirname: dirname,
        extname: extname,
        isAbsolute: isAbsolute,
        join: join,
        normalize: normalize,
        relative: relative,
        resolve: resolve,
        sep: sep
    });

    var require$$1 = /*@__PURE__*/getAugmentedNamespace(path$1);

    var hasRequiredReadWasm;

    function requireReadWasm () {
    	if (hasRequiredReadWasm) return readWasm.exports;
    	hasRequiredReadWasm = 1;
    	const isBrowserEnvironment = (function() {
    	    // eslint-disable-next-line no-undef
    	    return (typeof window !== "undefined") && (this === window);
    	}).call();

    	if (isBrowserEnvironment) {
    	  // Web version of reading a wasm file into an array buffer.

    	  let mappingsWasm = null;

    	  readWasm.exports = function readWasm() {
    	    if (typeof mappingsWasm === "string") {
    	      return fetch(mappingsWasm)
    	        .then(response => response.arrayBuffer());
    	    }
    	    if (mappingsWasm instanceof ArrayBuffer) {
    	      return Promise.resolve(mappingsWasm);
    	    }
    	    throw new Error("You must provide the string URL or ArrayBuffer contents " +
    	                    "of lib/mappings.wasm by calling " +
    	                    "SourceMapConsumer.initialize({ 'lib/mappings.wasm': ... }) " +
    	                    "before using SourceMapConsumer");
    	  };

    	  readWasm.exports.initialize = input => mappingsWasm = input;
    	} else {
    	  // Node version of reading a wasm file into an array buffer.
    	  const fs = require$$0;
    	  const path = require$$1;

    	  readWasm.exports = function readWasm() {
    	    return new Promise((resolve, reject) => {
    	      const wasmPath = path.join(__dirname, "mappings.wasm");
    	      fs.readFile(wasmPath, null, (error, data) => {
    	        if (error) {
    	          reject(error);
    	          return;
    	        }

    	        resolve(data.buffer);
    	      });
    	    });
    	  };

    	  readWasm.exports.initialize = _ => {
    	    console.debug("SourceMapConsumer.initialize is a no-op when running in node.js");
    	  };
    	}
    	return readWasm.exports;
    }

    var wasm;
    var hasRequiredWasm;

    function requireWasm () {
    	if (hasRequiredWasm) return wasm;
    	hasRequiredWasm = 1;
    	const readWasm = requireReadWasm();

    	/**
    	 * Provide the JIT with a nice shape / hidden class.
    	 */
    	function Mapping() {
    	  this.generatedLine = 0;
    	  this.generatedColumn = 0;
    	  this.lastGeneratedColumn = null;
    	  this.source = null;
    	  this.originalLine = null;
    	  this.originalColumn = null;
    	  this.name = null;
    	}

    	let cachedWasm = null;

    	wasm = function wasm() {
    	  if (cachedWasm) {
    	    return cachedWasm;
    	  }

    	  const callbackStack = [];

    	  cachedWasm = readWasm().then(buffer => {
    	      return WebAssembly.instantiate(buffer, {
    	        env: {
    	          mapping_callback(
    	            generatedLine,
    	            generatedColumn,

    	            hasLastGeneratedColumn,
    	            lastGeneratedColumn,

    	            hasOriginal,
    	            source,
    	            originalLine,
    	            originalColumn,

    	            hasName,
    	            name
    	          ) {
    	            const mapping = new Mapping();
    	            // JS uses 1-based line numbers, wasm uses 0-based.
    	            mapping.generatedLine = generatedLine + 1;
    	            mapping.generatedColumn = generatedColumn;

    	            if (hasLastGeneratedColumn) {
    	              // JS uses inclusive last generated column, wasm uses exclusive.
    	              mapping.lastGeneratedColumn = lastGeneratedColumn - 1;
    	            }

    	            if (hasOriginal) {
    	              mapping.source = source;
    	              // JS uses 1-based line numbers, wasm uses 0-based.
    	              mapping.originalLine = originalLine + 1;
    	              mapping.originalColumn = originalColumn;

    	              if (hasName) {
    	                mapping.name = name;
    	              }
    	            }

    	            callbackStack[callbackStack.length - 1](mapping);
    	          },

    	          start_all_generated_locations_for() { console.time("all_generated_locations_for"); },
    	          end_all_generated_locations_for() { console.timeEnd("all_generated_locations_for"); },

    	          start_compute_column_spans() { console.time("compute_column_spans"); },
    	          end_compute_column_spans() { console.timeEnd("compute_column_spans"); },

    	          start_generated_location_for() { console.time("generated_location_for"); },
    	          end_generated_location_for() { console.timeEnd("generated_location_for"); },

    	          start_original_location_for() { console.time("original_location_for"); },
    	          end_original_location_for() { console.timeEnd("original_location_for"); },

    	          start_parse_mappings() { console.time("parse_mappings"); },
    	          end_parse_mappings() { console.timeEnd("parse_mappings"); },

    	          start_sort_by_generated_location() { console.time("sort_by_generated_location"); },
    	          end_sort_by_generated_location() { console.timeEnd("sort_by_generated_location"); },

    	          start_sort_by_original_location() { console.time("sort_by_original_location"); },
    	          end_sort_by_original_location() { console.timeEnd("sort_by_original_location"); },
    	        }
    	      });
    	  }).then(Wasm => {
    	    return {
    	      exports: Wasm.instance.exports,
    	      withMappingCallback: (mappingCallback, f) => {
    	        callbackStack.push(mappingCallback);
    	        try {
    	          f();
    	        } finally {
    	          callbackStack.pop();
    	        }
    	      }
    	    };
    	  }).then(null, e => {
    	    cachedWasm = null;
    	    throw e;
    	  });

    	  return cachedWasm;
    	};
    	return wasm;
    }

    var hasRequiredSourceMapConsumer;

    function requireSourceMapConsumer () {
    	if (hasRequiredSourceMapConsumer) return sourceMapConsumer;
    	hasRequiredSourceMapConsumer = 1;
    	/*
    	 * Copyright 2011 Mozilla Foundation and contributors
    	 * Licensed under the New BSD license. See LICENSE or:
    	 * http://opensource.org/licenses/BSD-3-Clause
    	 */

    	const util = requireUtil();
    	const binarySearch = requireBinarySearch();
    	const ArraySet = requireArraySet().ArraySet;
    	requireBase64Vlq(); // eslint-disable-line no-unused-vars
    	const readWasm = requireReadWasm();
    	const wasm = requireWasm();

    	const INTERNAL = Symbol("smcInternal");

    	class SourceMapConsumer {
    	  constructor(aSourceMap, aSourceMapURL) {
    	    // If the constructor was called by super(), just return Promise<this>.
    	    // Yes, this is a hack to retain the pre-existing API of the base-class
    	    // constructor also being an async factory function.
    	    if (aSourceMap == INTERNAL) {
    	      return Promise.resolve(this);
    	    }

    	    return _factory(aSourceMap, aSourceMapURL);
    	  }

    	  static initialize(opts) {
    	    readWasm.initialize(opts["lib/mappings.wasm"]);
    	  }

    	  static fromSourceMap(aSourceMap, aSourceMapURL) {
    	    return _factoryBSM(aSourceMap, aSourceMapURL);
    	  }

    	  /**
    	   * Construct a new `SourceMapConsumer` from `rawSourceMap` and `sourceMapUrl`
    	   * (see the `SourceMapConsumer` constructor for details. Then, invoke the `async
    	   * function f(SourceMapConsumer) -> T` with the newly constructed consumer, wait
    	   * for `f` to complete, call `destroy` on the consumer, and return `f`'s return
    	   * value.
    	   *
    	   * You must not use the consumer after `f` completes!
    	   *
    	   * By using `with`, you do not have to remember to manually call `destroy` on
    	   * the consumer, since it will be called automatically once `f` completes.
    	   *
    	   * ```js
    	   * const xSquared = await SourceMapConsumer.with(
    	   *   myRawSourceMap,
    	   *   null,
    	   *   async function (consumer) {
    	   *     // Use `consumer` inside here and don't worry about remembering
    	   *     // to call `destroy`.
    	   *
    	   *     const x = await whatever(consumer);
    	   *     return x * x;
    	   *   }
    	   * );
    	   *
    	   * // You may not use that `consumer` anymore out here; it has
    	   * // been destroyed. But you can use `xSquared`.
    	   * console.log(xSquared);
    	   * ```
    	   */
    	  static async with(rawSourceMap, sourceMapUrl, f) {
    	    const consumer = await new SourceMapConsumer(rawSourceMap, sourceMapUrl);
    	    try {
    	      return await f(consumer);
    	    } finally {
    	      consumer.destroy();
    	    }
    	  }

    	  /**
    	   * Parse the mappings in a string in to a data structure which we can easily
    	   * query (the ordered arrays in the `this.__generatedMappings` and
    	   * `this.__originalMappings` properties).
    	   */
    	  _parseMappings(aStr, aSourceRoot) {
    	    throw new Error("Subclasses must implement _parseMappings");
    	  }

    	  /**
    	   * Iterate over each mapping between an original source/line/column and a
    	   * generated line/column in this source map.
    	   *
    	   * @param Function aCallback
    	   *        The function that is called with each mapping.
    	   * @param Object aContext
    	   *        Optional. If specified, this object will be the value of `this` every
    	   *        time that `aCallback` is called.
    	   * @param aOrder
    	   *        Either `SourceMapConsumer.GENERATED_ORDER` or
    	   *        `SourceMapConsumer.ORIGINAL_ORDER`. Specifies whether you want to
    	   *        iterate over the mappings sorted by the generated file's line/column
    	   *        order or the original's source/line/column order, respectively. Defaults to
    	   *        `SourceMapConsumer.GENERATED_ORDER`.
    	   */
    	  eachMapping(aCallback, aContext, aOrder) {
    	    throw new Error("Subclasses must implement eachMapping");
    	  }

    	  /**
    	   * Returns all generated line and column information for the original source,
    	   * line, and column provided. If no column is provided, returns all mappings
    	   * corresponding to a either the line we are searching for or the next
    	   * closest line that has any mappings. Otherwise, returns all mappings
    	   * corresponding to the given line and either the column we are searching for
    	   * or the next closest column that has any offsets.
    	   *
    	   * The only argument is an object with the following properties:
    	   *
    	   *   - source: The filename of the original source.
    	   *   - line: The line number in the original source.  The line number is 1-based.
    	   *   - column: Optional. the column number in the original source.
    	   *    The column number is 0-based.
    	   *
    	   * and an array of objects is returned, each with the following properties:
    	   *
    	   *   - line: The line number in the generated source, or null.  The
    	   *    line number is 1-based.
    	   *   - column: The column number in the generated source, or null.
    	   *    The column number is 0-based.
    	   */
    	  allGeneratedPositionsFor(aArgs) {
    	    throw new Error("Subclasses must implement allGeneratedPositionsFor");
    	  }

    	  destroy() {
    	    throw new Error("Subclasses must implement destroy");
    	  }
    	}

    	/**
    	 * The version of the source mapping spec that we are consuming.
    	 */
    	SourceMapConsumer.prototype._version = 3;
    	SourceMapConsumer.GENERATED_ORDER = 1;
    	SourceMapConsumer.ORIGINAL_ORDER = 2;

    	SourceMapConsumer.GREATEST_LOWER_BOUND = 1;
    	SourceMapConsumer.LEAST_UPPER_BOUND = 2;

    	sourceMapConsumer.SourceMapConsumer = SourceMapConsumer;

    	/**
    	 * A BasicSourceMapConsumer instance represents a parsed source map which we can
    	 * query for information about the original file positions by giving it a file
    	 * position in the generated source.
    	 *
    	 * The first parameter is the raw source map (either as a JSON string, or
    	 * already parsed to an object). According to the spec, source maps have the
    	 * following attributes:
    	 *
    	 *   - version: Which version of the source map spec this map is following.
    	 *   - sources: An array of URLs to the original source files.
    	 *   - names: An array of identifiers which can be referenced by individual mappings.
    	 *   - sourceRoot: Optional. The URL root from which all sources are relative.
    	 *   - sourcesContent: Optional. An array of contents of the original source files.
    	 *   - mappings: A string of base64 VLQs which contain the actual mappings.
    	 *   - file: Optional. The generated file this source map is associated with.
    	 *
    	 * Here is an example source map, taken from the source map spec[0]:
    	 *
    	 *     {
    	 *       version : 3,
    	 *       file: "out.js",
    	 *       sourceRoot : "",
    	 *       sources: ["foo.js", "bar.js"],
    	 *       names: ["src", "maps", "are", "fun"],
    	 *       mappings: "AA,AB;;ABCDE;"
    	 *     }
    	 *
    	 * The second parameter, if given, is a string whose value is the URL
    	 * at which the source map was found.  This URL is used to compute the
    	 * sources array.
    	 *
    	 * [0]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit?pli=1#
    	 */
    	class BasicSourceMapConsumer extends SourceMapConsumer {
    	  constructor(aSourceMap, aSourceMapURL) {
    	    return super(INTERNAL).then(that => {
    	      let sourceMap = aSourceMap;
    	      if (typeof aSourceMap === "string") {
    	        sourceMap = util.parseSourceMapInput(aSourceMap);
    	      }

    	      const version = util.getArg(sourceMap, "version");
    	      let sources = util.getArg(sourceMap, "sources");
    	      // Sass 3.3 leaves out the 'names' array, so we deviate from the spec (which
    	      // requires the array) to play nice here.
    	      const names = util.getArg(sourceMap, "names", []);
    	      let sourceRoot = util.getArg(sourceMap, "sourceRoot", null);
    	      const sourcesContent = util.getArg(sourceMap, "sourcesContent", null);
    	      const mappings = util.getArg(sourceMap, "mappings");
    	      const file = util.getArg(sourceMap, "file", null);

    	      // Once again, Sass deviates from the spec and supplies the version as a
    	      // string rather than a number, so we use loose equality checking here.
    	      if (version != that._version) {
    	        throw new Error("Unsupported version: " + version);
    	      }

    	      if (sourceRoot) {
    	        sourceRoot = util.normalize(sourceRoot);
    	      }

    	      sources = sources
    	        .map(String)
    	        // Some source maps produce relative source paths like "./foo.js" instead of
    	        // "foo.js".  Normalize these first so that future comparisons will succeed.
    	        // See bugzil.la/1090768.
    	        .map(util.normalize)
    	        // Always ensure that absolute sources are internally stored relative to
    	        // the source root, if the source root is absolute. Not doing this would
    	        // be particularly problematic when the source root is a prefix of the
    	        // source (valid, but why??). See github issue #199 and bugzil.la/1188982.
    	        .map(function(source) {
    	          return sourceRoot && util.isAbsolute(sourceRoot) && util.isAbsolute(source)
    	            ? util.relative(sourceRoot, source)
    	            : source;
    	        });

    	      // Pass `true` below to allow duplicate names and sources. While source maps
    	      // are intended to be compressed and deduplicated, the TypeScript compiler
    	      // sometimes generates source maps with duplicates in them. See Github issue
    	      // #72 and bugzil.la/889492.
    	      that._names = ArraySet.fromArray(names.map(String), true);
    	      that._sources = ArraySet.fromArray(sources, true);

    	      that._absoluteSources = that._sources.toArray().map(function(s) {
    	        return util.computeSourceURL(sourceRoot, s, aSourceMapURL);
    	      });

    	      that.sourceRoot = sourceRoot;
    	      that.sourcesContent = sourcesContent;
    	      that._mappings = mappings;
    	      that._sourceMapURL = aSourceMapURL;
    	      that.file = file;

    	      that._computedColumnSpans = false;
    	      that._mappingsPtr = 0;
    	      that._wasm = null;

    	      return wasm().then(w => {
    	        that._wasm = w;
    	        return that;
    	      });
    	    });
    	  }

    	  /**
    	   * Utility function to find the index of a source.  Returns -1 if not
    	   * found.
    	   */
    	  _findSourceIndex(aSource) {
    	    let relativeSource = aSource;
    	    if (this.sourceRoot != null) {
    	      relativeSource = util.relative(this.sourceRoot, relativeSource);
    	    }

    	    if (this._sources.has(relativeSource)) {
    	      return this._sources.indexOf(relativeSource);
    	    }

    	    // Maybe aSource is an absolute URL as returned by |sources|.  In
    	    // this case we can't simply undo the transform.
    	    for (let i = 0; i < this._absoluteSources.length; ++i) {
    	      if (this._absoluteSources[i] == aSource) {
    	        return i;
    	      }
    	    }

    	    return -1;
    	  }

    	  /**
    	   * Create a BasicSourceMapConsumer from a SourceMapGenerator.
    	   *
    	   * @param SourceMapGenerator aSourceMap
    	   *        The source map that will be consumed.
    	   * @param String aSourceMapURL
    	   *        The URL at which the source map can be found (optional)
    	   * @returns BasicSourceMapConsumer
    	   */
    	  static fromSourceMap(aSourceMap, aSourceMapURL) {
    	    return new BasicSourceMapConsumer(aSourceMap.toString());
    	  }

    	  get sources() {
    	    return this._absoluteSources.slice();
    	  }

    	  _getMappingsPtr() {
    	    if (this._mappingsPtr === 0) {
    	      this._parseMappings(this._mappings, this.sourceRoot);
    	    }

    	    return this._mappingsPtr;
    	  }

    	  /**
    	   * Parse the mappings in a string in to a data structure which we can easily
    	   * query (the ordered arrays in the `this.__generatedMappings` and
    	   * `this.__originalMappings` properties).
    	   */
    	  _parseMappings(aStr, aSourceRoot) {
    	    const size = aStr.length;

    	    const mappingsBufPtr = this._wasm.exports.allocate_mappings(size);
    	    const mappingsBuf = new Uint8Array(this._wasm.exports.memory.buffer, mappingsBufPtr, size);
    	    for (let i = 0; i < size; i++) {
    	      mappingsBuf[i] = aStr.charCodeAt(i);
    	    }

    	    const mappingsPtr = this._wasm.exports.parse_mappings(mappingsBufPtr);

    	    if (!mappingsPtr) {
    	      const error = this._wasm.exports.get_last_error();
    	      let msg = `Error parsing mappings (code ${error}): `;

    	      // XXX: keep these error codes in sync with `fitzgen/source-map-mappings`.
    	      switch (error) {
    	        case 1:
    	          msg += "the mappings contained a negative line, column, source index, or name index";
    	          break;
    	        case 2:
    	          msg += "the mappings contained a number larger than 2**32";
    	          break;
    	        case 3:
    	          msg += "reached EOF while in the middle of parsing a VLQ";
    	          break;
    	        case 4:
    	          msg += "invalid base 64 character while parsing a VLQ";
    	          break;
    	        default:
    	          msg += "unknown error code";
    	          break;
    	      }

    	      throw new Error(msg);
    	    }

    	    this._mappingsPtr = mappingsPtr;
    	  }

    	  eachMapping(aCallback, aContext, aOrder) {
    	    const context = aContext || null;
    	    const order = aOrder || SourceMapConsumer.GENERATED_ORDER;
    	    const sourceRoot = this.sourceRoot;

    	    this._wasm.withMappingCallback(
    	      mapping => {
    	        if (mapping.source !== null) {
    	          mapping.source = this._sources.at(mapping.source);
    	          mapping.source = util.computeSourceURL(sourceRoot, mapping.source, this._sourceMapURL);

    	          if (mapping.name !== null) {
    	            mapping.name = this._names.at(mapping.name);
    	          }
    	        }

    	        aCallback.call(context, mapping);
    	      },
    	      () => {
    	        switch (order) {
    	        case SourceMapConsumer.GENERATED_ORDER:
    	          this._wasm.exports.by_generated_location(this._getMappingsPtr());
    	          break;
    	        case SourceMapConsumer.ORIGINAL_ORDER:
    	          this._wasm.exports.by_original_location(this._getMappingsPtr());
    	          break;
    	        default:
    	          throw new Error("Unknown order of iteration.");
    	        }
    	      }
    	    );
    	  }

    	  allGeneratedPositionsFor(aArgs) {
    	    let source = util.getArg(aArgs, "source");
    	    const originalLine = util.getArg(aArgs, "line");
    	    const originalColumn = aArgs.column || 0;

    	    source = this._findSourceIndex(source);
    	    if (source < 0) {
    	      return [];
    	    }

    	    if (originalLine < 1) {
    	      throw new Error("Line numbers must be >= 1");
    	    }

    	    if (originalColumn < 0) {
    	      throw new Error("Column numbers must be >= 0");
    	    }

    	    const mappings = [];

    	    this._wasm.withMappingCallback(
    	      m => {
    	        let lastColumn = m.lastGeneratedColumn;
    	        if (this._computedColumnSpans && lastColumn === null) {
    	          lastColumn = Infinity;
    	        }
    	        mappings.push({
    	          line: m.generatedLine,
    	          column: m.generatedColumn,
    	          lastColumn,
    	        });
    	      }, () => {
    	        this._wasm.exports.all_generated_locations_for(
    	          this._getMappingsPtr(),
    	          source,
    	          originalLine - 1,
    	          "column" in aArgs,
    	          originalColumn
    	        );
    	      }
    	    );

    	    return mappings;
    	  }

    	  destroy() {
    	    if (this._mappingsPtr !== 0) {
    	      this._wasm.exports.free_mappings(this._mappingsPtr);
    	      this._mappingsPtr = 0;
    	    }
    	  }

    	  /**
    	   * Compute the last column for each generated mapping. The last column is
    	   * inclusive.
    	   */
    	  computeColumnSpans() {
    	    if (this._computedColumnSpans) {
    	      return;
    	    }

    	    this._wasm.exports.compute_column_spans(this._getMappingsPtr());
    	    this._computedColumnSpans = true;
    	  }

    	  /**
    	   * Returns the original source, line, and column information for the generated
    	   * source's line and column positions provided. The only argument is an object
    	   * with the following properties:
    	   *
    	   *   - line: The line number in the generated source.  The line number
    	   *     is 1-based.
    	   *   - column: The column number in the generated source.  The column
    	   *     number is 0-based.
    	   *   - bias: Either 'SourceMapConsumer.GREATEST_LOWER_BOUND' or
    	   *     'SourceMapConsumer.LEAST_UPPER_BOUND'. Specifies whether to return the
    	   *     closest element that is smaller than or greater than the one we are
    	   *     searching for, respectively, if the exact element cannot be found.
    	   *     Defaults to 'SourceMapConsumer.GREATEST_LOWER_BOUND'.
    	   *
    	   * and an object is returned with the following properties:
    	   *
    	   *   - source: The original source file, or null.
    	   *   - line: The line number in the original source, or null.  The
    	   *     line number is 1-based.
    	   *   - column: The column number in the original source, or null.  The
    	   *     column number is 0-based.
    	   *   - name: The original identifier, or null.
    	   */
    	  originalPositionFor(aArgs) {
    	    const needle = {
    	      generatedLine: util.getArg(aArgs, "line"),
    	      generatedColumn: util.getArg(aArgs, "column")
    	    };

    	    if (needle.generatedLine < 1) {
    	      throw new Error("Line numbers must be >= 1");
    	    }

    	    if (needle.generatedColumn < 0) {
    	      throw new Error("Column numbers must be >= 0");
    	    }

    	    let bias = util.getArg(aArgs, "bias", SourceMapConsumer.GREATEST_LOWER_BOUND);
    	    if (bias == null) {
    	      bias = SourceMapConsumer.GREATEST_LOWER_BOUND;
    	    }

    	    let mapping;
    	    this._wasm.withMappingCallback(m => mapping = m, () => {
    	      this._wasm.exports.original_location_for(
    	        this._getMappingsPtr(),
    	        needle.generatedLine - 1,
    	        needle.generatedColumn,
    	        bias
    	      );
    	    });

    	    if (mapping) {
    	      if (mapping.generatedLine === needle.generatedLine) {
    	        let source = util.getArg(mapping, "source", null);
    	        if (source !== null) {
    	          source = this._sources.at(source);
    	          source = util.computeSourceURL(this.sourceRoot, source, this._sourceMapURL);
    	        }

    	        let name = util.getArg(mapping, "name", null);
    	        if (name !== null) {
    	          name = this._names.at(name);
    	        }

    	        return {
    	          source,
    	          line: util.getArg(mapping, "originalLine", null),
    	          column: util.getArg(mapping, "originalColumn", null),
    	          name
    	        };
    	      }
    	    }

    	    return {
    	      source: null,
    	      line: null,
    	      column: null,
    	      name: null
    	    };
    	  }

    	  /**
    	   * Return true if we have the source content for every source in the source
    	   * map, false otherwise.
    	   */
    	  hasContentsOfAllSources() {
    	    if (!this.sourcesContent) {
    	      return false;
    	    }
    	    return this.sourcesContent.length >= this._sources.size() &&
    	      !this.sourcesContent.some(function(sc) { return sc == null; });
    	  }

    	  /**
    	   * Returns the original source content. The only argument is the url of the
    	   * original source file. Returns null if no original source content is
    	   * available.
    	   */
    	  sourceContentFor(aSource, nullOnMissing) {
    	    if (!this.sourcesContent) {
    	      return null;
    	    }

    	    const index = this._findSourceIndex(aSource);
    	    if (index >= 0) {
    	      return this.sourcesContent[index];
    	    }

    	    let relativeSource = aSource;
    	    if (this.sourceRoot != null) {
    	      relativeSource = util.relative(this.sourceRoot, relativeSource);
    	    }

    	    let url;
    	    if (this.sourceRoot != null
    	        && (url = util.urlParse(this.sourceRoot))) {
    	      // XXX: file:// URIs and absolute paths lead to unexpected behavior for
    	      // many users. We can help them out when they expect file:// URIs to
    	      // behave like it would if they were running a local HTTP server. See
    	      // https://bugzilla.mozilla.org/show_bug.cgi?id=885597.
    	      const fileUriAbsPath = relativeSource.replace(/^file:\/\//, "");
    	      if (url.scheme == "file"
    	          && this._sources.has(fileUriAbsPath)) {
    	        return this.sourcesContent[this._sources.indexOf(fileUriAbsPath)];
    	      }

    	      if ((!url.path || url.path == "/")
    	          && this._sources.has("/" + relativeSource)) {
    	        return this.sourcesContent[this._sources.indexOf("/" + relativeSource)];
    	      }
    	    }

    	    // This function is used recursively from
    	    // IndexedSourceMapConsumer.prototype.sourceContentFor. In that case, we
    	    // don't want to throw if we can't find the source - we just want to
    	    // return null, so we provide a flag to exit gracefully.
    	    if (nullOnMissing) {
    	      return null;
    	    }

    	    throw new Error('"' + relativeSource + '" is not in the SourceMap.');
    	  }

    	  /**
    	   * Returns the generated line and column information for the original source,
    	   * line, and column positions provided. The only argument is an object with
    	   * the following properties:
    	   *
    	   *   - source: The filename of the original source.
    	   *   - line: The line number in the original source.  The line number
    	   *     is 1-based.
    	   *   - column: The column number in the original source.  The column
    	   *     number is 0-based.
    	   *   - bias: Either 'SourceMapConsumer.GREATEST_LOWER_BOUND' or
    	   *     'SourceMapConsumer.LEAST_UPPER_BOUND'. Specifies whether to return the
    	   *     closest element that is smaller than or greater than the one we are
    	   *     searching for, respectively, if the exact element cannot be found.
    	   *     Defaults to 'SourceMapConsumer.GREATEST_LOWER_BOUND'.
    	   *
    	   * and an object is returned with the following properties:
    	   *
    	   *   - line: The line number in the generated source, or null.  The
    	   *     line number is 1-based.
    	   *   - column: The column number in the generated source, or null.
    	   *     The column number is 0-based.
    	   */
    	  generatedPositionFor(aArgs) {
    	    let source = util.getArg(aArgs, "source");
    	    source = this._findSourceIndex(source);
    	    if (source < 0) {
    	      return {
    	        line: null,
    	        column: null,
    	        lastColumn: null
    	      };
    	    }

    	    const needle = {
    	      source,
    	      originalLine: util.getArg(aArgs, "line"),
    	      originalColumn: util.getArg(aArgs, "column")
    	    };

    	    if (needle.originalLine < 1) {
    	      throw new Error("Line numbers must be >= 1");
    	    }

    	    if (needle.originalColumn < 0) {
    	      throw new Error("Column numbers must be >= 0");
    	    }

    	    let bias = util.getArg(aArgs, "bias", SourceMapConsumer.GREATEST_LOWER_BOUND);
    	    if (bias == null) {
    	      bias = SourceMapConsumer.GREATEST_LOWER_BOUND;
    	    }

    	    let mapping;
    	    this._wasm.withMappingCallback(m => mapping = m, () => {
    	      this._wasm.exports.generated_location_for(
    	        this._getMappingsPtr(),
    	        needle.source,
    	        needle.originalLine - 1,
    	        needle.originalColumn,
    	        bias
    	      );
    	    });

    	    if (mapping) {
    	      if (mapping.source === needle.source) {
    	        let lastColumn = mapping.lastGeneratedColumn;
    	        if (this._computedColumnSpans && lastColumn === null) {
    	          lastColumn = Infinity;
    	        }
    	        return {
    	          line: util.getArg(mapping, "generatedLine", null),
    	          column: util.getArg(mapping, "generatedColumn", null),
    	          lastColumn,
    	        };
    	      }
    	    }

    	    return {
    	      line: null,
    	      column: null,
    	      lastColumn: null
    	    };
    	  }
    	}

    	BasicSourceMapConsumer.prototype.consumer = SourceMapConsumer;
    	sourceMapConsumer.BasicSourceMapConsumer = BasicSourceMapConsumer;

    	/**
    	 * An IndexedSourceMapConsumer instance represents a parsed source map which
    	 * we can query for information. It differs from BasicSourceMapConsumer in
    	 * that it takes "indexed" source maps (i.e. ones with a "sections" field) as
    	 * input.
    	 *
    	 * The first parameter is a raw source map (either as a JSON string, or already
    	 * parsed to an object). According to the spec for indexed source maps, they
    	 * have the following attributes:
    	 *
    	 *   - version: Which version of the source map spec this map is following.
    	 *   - file: Optional. The generated file this source map is associated with.
    	 *   - sections: A list of section definitions.
    	 *
    	 * Each value under the "sections" field has two fields:
    	 *   - offset: The offset into the original specified at which this section
    	 *       begins to apply, defined as an object with a "line" and "column"
    	 *       field.
    	 *   - map: A source map definition. This source map could also be indexed,
    	 *       but doesn't have to be.
    	 *
    	 * Instead of the "map" field, it's also possible to have a "url" field
    	 * specifying a URL to retrieve a source map from, but that's currently
    	 * unsupported.
    	 *
    	 * Here's an example source map, taken from the source map spec[0], but
    	 * modified to omit a section which uses the "url" field.
    	 *
    	 *  {
    	 *    version : 3,
    	 *    file: "app.js",
    	 *    sections: [{
    	 *      offset: {line:100, column:10},
    	 *      map: {
    	 *        version : 3,
    	 *        file: "section.js",
    	 *        sources: ["foo.js", "bar.js"],
    	 *        names: ["src", "maps", "are", "fun"],
    	 *        mappings: "AAAA,E;;ABCDE;"
    	 *      }
    	 *    }],
    	 *  }
    	 *
    	 * The second parameter, if given, is a string whose value is the URL
    	 * at which the source map was found.  This URL is used to compute the
    	 * sources array.
    	 *
    	 * [0]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit#heading=h.535es3xeprgt
    	 */
    	class IndexedSourceMapConsumer extends SourceMapConsumer {
    	  constructor(aSourceMap, aSourceMapURL) {
    	    return super(INTERNAL).then(that => {
    	      let sourceMap = aSourceMap;
    	      if (typeof aSourceMap === "string") {
    	        sourceMap = util.parseSourceMapInput(aSourceMap);
    	      }

    	      const version = util.getArg(sourceMap, "version");
    	      const sections = util.getArg(sourceMap, "sections");

    	      if (version != that._version) {
    	        throw new Error("Unsupported version: " + version);
    	      }

    	      that._sources = new ArraySet();
    	      that._names = new ArraySet();
    	      that.__generatedMappings = null;
    	      that.__originalMappings = null;
    	      that.__generatedMappingsUnsorted = null;
    	      that.__originalMappingsUnsorted = null;

    	      let lastOffset = {
    	        line: -1,
    	        column: 0
    	      };
    	      return Promise.all(sections.map(s => {
    	        if (s.url) {
    	          // The url field will require support for asynchronicity.
    	          // See https://github.com/mozilla/source-map/issues/16
    	          throw new Error("Support for url field in sections not implemented.");
    	        }
    	        const offset = util.getArg(s, "offset");
    	        const offsetLine = util.getArg(offset, "line");
    	        const offsetColumn = util.getArg(offset, "column");

    	        if (offsetLine < lastOffset.line ||
    	            (offsetLine === lastOffset.line && offsetColumn < lastOffset.column)) {
    	          throw new Error("Section offsets must be ordered and non-overlapping.");
    	        }
    	        lastOffset = offset;

    	        const cons = new SourceMapConsumer(util.getArg(s, "map"), aSourceMapURL);
    	        return cons.then(consumer => {
    	          return {
    	            generatedOffset: {
    	              // The offset fields are 0-based, but we use 1-based indices when
    	              // encoding/decoding from VLQ.
    	              generatedLine: offsetLine + 1,
    	              generatedColumn: offsetColumn + 1
    	            },
    	            consumer
    	          };
    	        });
    	      })).then(s => {
    	        that._sections = s;
    	        return that;
    	      });
    	    });
    	  }

    	  // `__generatedMappings` and `__originalMappings` are arrays that hold the
    	  // parsed mapping coordinates from the source map's "mappings" attribute. They
    	  // are lazily instantiated, accessed via the `_generatedMappings` and
    	  // `_originalMappings` getters respectively, and we only parse the mappings
    	  // and create these arrays once queried for a source location. We jump through
    	  // these hoops because there can be many thousands of mappings, and parsing
    	  // them is expensive, so we only want to do it if we must.
    	  //
    	  // Each object in the arrays is of the form:
    	  //
    	  //     {
    	  //       generatedLine: The line number in the generated code,
    	  //       generatedColumn: The column number in the generated code,
    	  //       source: The path to the original source file that generated this
    	  //               chunk of code,
    	  //       originalLine: The line number in the original source that
    	  //                     corresponds to this chunk of generated code,
    	  //       originalColumn: The column number in the original source that
    	  //                       corresponds to this chunk of generated code,
    	  //       name: The name of the original symbol which generated this chunk of
    	  //             code.
    	  //     }
    	  //
    	  // All properties except for `generatedLine` and `generatedColumn` can be
    	  // `null`.
    	  //
    	  // `_generatedMappings` is ordered by the generated positions.
    	  //
    	  // `_originalMappings` is ordered by the original positions.
    	  get _generatedMappings() {
    	    if (!this.__generatedMappings) {
    	      this._sortGeneratedMappings();
    	    }

    	    return this.__generatedMappings;
    	  }

    	  get _originalMappings() {
    	    if (!this.__originalMappings) {
    	      this._sortOriginalMappings();
    	    }

    	    return this.__originalMappings;
    	  }

    	  get _generatedMappingsUnsorted() {
    	    if (!this.__generatedMappingsUnsorted) {
    	      this._parseMappings(this._mappings, this.sourceRoot);
    	    }

    	    return this.__generatedMappingsUnsorted;
    	  }

    	  get _originalMappingsUnsorted() {
    	    if (!this.__originalMappingsUnsorted) {
    	      this._parseMappings(this._mappings, this.sourceRoot);
    	    }

    	    return this.__originalMappingsUnsorted;
    	  }

    	  _sortGeneratedMappings() {
    	    const mappings = this._generatedMappingsUnsorted;
    	    mappings.sort(util.compareByGeneratedPositionsDeflated);
    	    this.__generatedMappings = mappings;
    	  }

    	  _sortOriginalMappings() {
    	    const mappings = this._originalMappingsUnsorted;
    	    mappings.sort(util.compareByOriginalPositions);
    	    this.__originalMappings = mappings;
    	  }

    	  /**
    	   * The list of original sources.
    	   */
    	  get sources() {
    	    const sources = [];
    	    for (let i = 0; i < this._sections.length; i++) {
    	      for (let j = 0; j < this._sections[i].consumer.sources.length; j++) {
    	        sources.push(this._sections[i].consumer.sources[j]);
    	      }
    	    }
    	    return sources;
    	  }

    	  /**
    	   * Returns the original source, line, and column information for the generated
    	   * source's line and column positions provided. The only argument is an object
    	   * with the following properties:
    	   *
    	   *   - line: The line number in the generated source.  The line number
    	   *     is 1-based.
    	   *   - column: The column number in the generated source.  The column
    	   *     number is 0-based.
    	   *
    	   * and an object is returned with the following properties:
    	   *
    	   *   - source: The original source file, or null.
    	   *   - line: The line number in the original source, or null.  The
    	   *     line number is 1-based.
    	   *   - column: The column number in the original source, or null.  The
    	   *     column number is 0-based.
    	   *   - name: The original identifier, or null.
    	   */
    	  originalPositionFor(aArgs) {
    	    const needle = {
    	      generatedLine: util.getArg(aArgs, "line"),
    	      generatedColumn: util.getArg(aArgs, "column")
    	    };

    	    // Find the section containing the generated position we're trying to map
    	    // to an original position.
    	    const sectionIndex = binarySearch.search(needle, this._sections,
    	      function(aNeedle, section) {
    	        const cmp = aNeedle.generatedLine - section.generatedOffset.generatedLine;
    	        if (cmp) {
    	          return cmp;
    	        }

    	        return (aNeedle.generatedColumn -
    	                section.generatedOffset.generatedColumn);
    	      });
    	    const section = this._sections[sectionIndex];

    	    if (!section) {
    	      return {
    	        source: null,
    	        line: null,
    	        column: null,
    	        name: null
    	      };
    	    }

    	    return section.consumer.originalPositionFor({
    	      line: needle.generatedLine -
    	        (section.generatedOffset.generatedLine - 1),
    	      column: needle.generatedColumn -
    	        (section.generatedOffset.generatedLine === needle.generatedLine
    	         ? section.generatedOffset.generatedColumn - 1
    	         : 0),
    	      bias: aArgs.bias
    	    });
    	  }

    	  /**
    	   * Return true if we have the source content for every source in the source
    	   * map, false otherwise.
    	   */
    	  hasContentsOfAllSources() {
    	    return this._sections.every(function(s) {
    	      return s.consumer.hasContentsOfAllSources();
    	    });
    	  }

    	  /**
    	   * Returns the original source content. The only argument is the url of the
    	   * original source file. Returns null if no original source content is
    	   * available.
    	   */
    	  sourceContentFor(aSource, nullOnMissing) {
    	    for (let i = 0; i < this._sections.length; i++) {
    	      const section = this._sections[i];

    	      const content = section.consumer.sourceContentFor(aSource, true);
    	      if (content) {
    	        return content;
    	      }
    	    }
    	    if (nullOnMissing) {
    	      return null;
    	    }
    	    throw new Error('"' + aSource + '" is not in the SourceMap.');
    	  }

    	  /**
    	   * Returns the generated line and column information for the original source,
    	   * line, and column positions provided. The only argument is an object with
    	   * the following properties:
    	   *
    	   *   - source: The filename of the original source.
    	   *   - line: The line number in the original source.  The line number
    	   *     is 1-based.
    	   *   - column: The column number in the original source.  The column
    	   *     number is 0-based.
    	   *
    	   * and an object is returned with the following properties:
    	   *
    	   *   - line: The line number in the generated source, or null.  The
    	   *     line number is 1-based.
    	   *   - column: The column number in the generated source, or null.
    	   *     The column number is 0-based.
    	   */
    	  generatedPositionFor(aArgs) {
    	    for (let i = 0; i < this._sections.length; i++) {
    	      const section = this._sections[i];

    	      // Only consider this section if the requested source is in the list of
    	      // sources of the consumer.
    	      if (section.consumer._findSourceIndex(util.getArg(aArgs, "source")) === -1) {
    	        continue;
    	      }
    	      const generatedPosition = section.consumer.generatedPositionFor(aArgs);
    	      if (generatedPosition) {
    	        const ret = {
    	          line: generatedPosition.line +
    	            (section.generatedOffset.generatedLine - 1),
    	          column: generatedPosition.column +
    	            (section.generatedOffset.generatedLine === generatedPosition.line
    	             ? section.generatedOffset.generatedColumn - 1
    	             : 0)
    	        };
    	        return ret;
    	      }
    	    }

    	    return {
    	      line: null,
    	      column: null
    	    };
    	  }

    	  /**
    	   * Parse the mappings in a string in to a data structure which we can easily
    	   * query (the ordered arrays in the `this.__generatedMappings` and
    	   * `this.__originalMappings` properties).
    	   */
    	  _parseMappings(aStr, aSourceRoot) {
    	    const generatedMappings = this.__generatedMappingsUnsorted = [];
    	    const originalMappings = this.__originalMappingsUnsorted = [];
    	    for (let i = 0; i < this._sections.length; i++) {
    	      const section = this._sections[i];

    	      const sectionMappings = [];
    	      section.consumer.eachMapping(m => sectionMappings.push(m));

    	      for (let j = 0; j < sectionMappings.length; j++) {
    	        const mapping = sectionMappings[j];

    	        // TODO: test if null is correct here.  The original code used
    	        // `source`, which would actually have gotten used as null because
    	        // var's get hoisted.
    	        // See: https://github.com/mozilla/source-map/issues/333
    	        let source = util.computeSourceURL(section.consumer.sourceRoot, null, this._sourceMapURL);
    	        this._sources.add(source);
    	        source = this._sources.indexOf(source);

    	        let name = null;
    	        if (mapping.name) {
    	          this._names.add(mapping.name);
    	          name = this._names.indexOf(mapping.name);
    	        }

    	        // The mappings coming from the consumer for the section have
    	        // generated positions relative to the start of the section, so we
    	        // need to offset them to be relative to the start of the concatenated
    	        // generated file.
    	        const adjustedMapping = {
    	          source,
    	          generatedLine: mapping.generatedLine +
    	            (section.generatedOffset.generatedLine - 1),
    	          generatedColumn: mapping.generatedColumn +
    	            (section.generatedOffset.generatedLine === mapping.generatedLine
    	            ? section.generatedOffset.generatedColumn - 1
    	            : 0),
    	          originalLine: mapping.originalLine,
    	          originalColumn: mapping.originalColumn,
    	          name
    	        };

    	        generatedMappings.push(adjustedMapping);
    	        if (typeof adjustedMapping.originalLine === "number") {
    	          originalMappings.push(adjustedMapping);
    	        }
    	      }
    	    }
    	  }

    	  eachMapping(aCallback, aContext, aOrder) {
    	    const context = aContext || null;
    	    const order = aOrder || SourceMapConsumer.GENERATED_ORDER;

    	    let mappings;
    	    switch (order) {
    	    case SourceMapConsumer.GENERATED_ORDER:
    	      mappings = this._generatedMappings;
    	      break;
    	    case SourceMapConsumer.ORIGINAL_ORDER:
    	      mappings = this._originalMappings;
    	      break;
    	    default:
    	      throw new Error("Unknown order of iteration.");
    	    }

    	    const sourceRoot = this.sourceRoot;
    	    mappings.map(function(mapping) {
    	      let source = null;
    	      if (mapping.source !== null) {
    	        source = this._sources.at(mapping.source);
    	        source = util.computeSourceURL(sourceRoot, source, this._sourceMapURL);
    	      }
    	      return {
    	        source,
    	        generatedLine: mapping.generatedLine,
    	        generatedColumn: mapping.generatedColumn,
    	        originalLine: mapping.originalLine,
    	        originalColumn: mapping.originalColumn,
    	        name: mapping.name === null ? null : this._names.at(mapping.name)
    	      };
    	    }, this).forEach(aCallback, context);
    	  }

    	  /**
    	   * Find the mapping that best matches the hypothetical "needle" mapping that
    	   * we are searching for in the given "haystack" of mappings.
    	   */
    	  _findMapping(aNeedle, aMappings, aLineName,
    	              aColumnName, aComparator, aBias) {
    	    // To return the position we are searching for, we must first find the
    	    // mapping for the given position and then return the opposite position it
    	    // points to. Because the mappings are sorted, we can use binary search to
    	    // find the best mapping.

    	    if (aNeedle[aLineName] <= 0) {
    	      throw new TypeError("Line must be greater than or equal to 1, got "
    	                          + aNeedle[aLineName]);
    	    }
    	    if (aNeedle[aColumnName] < 0) {
    	      throw new TypeError("Column must be greater than or equal to 0, got "
    	                          + aNeedle[aColumnName]);
    	    }

    	    return binarySearch.search(aNeedle, aMappings, aComparator, aBias);
    	  }

    	  allGeneratedPositionsFor(aArgs) {
    	    const line = util.getArg(aArgs, "line");

    	    // When there is no exact match, BasicSourceMapConsumer.prototype._findMapping
    	    // returns the index of the closest mapping less than the needle. By
    	    // setting needle.originalColumn to 0, we thus find the last mapping for
    	    // the given line, provided such a mapping exists.
    	    const needle = {
    	      source: util.getArg(aArgs, "source"),
    	      originalLine: line,
    	      originalColumn: util.getArg(aArgs, "column", 0)
    	    };

    	    needle.source = this._findSourceIndex(needle.source);
    	    if (needle.source < 0) {
    	      return [];
    	    }

    	    if (needle.originalLine < 1) {
    	      throw new Error("Line numbers must be >= 1");
    	    }

    	    if (needle.originalColumn < 0) {
    	      throw new Error("Column numbers must be >= 0");
    	    }

    	    const mappings = [];

    	    let index = this._findMapping(needle,
    	                                  this._originalMappings,
    	                                  "originalLine",
    	                                  "originalColumn",
    	                                  util.compareByOriginalPositions,
    	                                  binarySearch.LEAST_UPPER_BOUND);
    	    if (index >= 0) {
    	      let mapping = this._originalMappings[index];

    	      if (aArgs.column === undefined) {
    	        const originalLine = mapping.originalLine;

    	        // Iterate until either we run out of mappings, or we run into
    	        // a mapping for a different line than the one we found. Since
    	        // mappings are sorted, this is guaranteed to find all mappings for
    	        // the line we found.
    	        while (mapping && mapping.originalLine === originalLine) {
    	          let lastColumn = mapping.lastGeneratedColumn;
    	          if (this._computedColumnSpans && lastColumn === null) {
    	            lastColumn = Infinity;
    	          }
    	          mappings.push({
    	            line: util.getArg(mapping, "generatedLine", null),
    	            column: util.getArg(mapping, "generatedColumn", null),
    	            lastColumn,
    	          });

    	          mapping = this._originalMappings[++index];
    	        }
    	      } else {
    	        const originalColumn = mapping.originalColumn;

    	        // Iterate until either we run out of mappings, or we run into
    	        // a mapping for a different line than the one we were searching for.
    	        // Since mappings are sorted, this is guaranteed to find all mappings for
    	        // the line we are searching for.
    	        while (mapping &&
    	               mapping.originalLine === line &&
    	               mapping.originalColumn == originalColumn) {
    	          let lastColumn = mapping.lastGeneratedColumn;
    	          if (this._computedColumnSpans && lastColumn === null) {
    	            lastColumn = Infinity;
    	          }
    	          mappings.push({
    	            line: util.getArg(mapping, "generatedLine", null),
    	            column: util.getArg(mapping, "generatedColumn", null),
    	            lastColumn,
    	          });

    	          mapping = this._originalMappings[++index];
    	        }
    	      }
    	    }

    	    return mappings;
    	  }

    	  destroy() {
    	    for (let i = 0; i < this._sections.length; i++) {
    	      this._sections[i].consumer.destroy();
    	    }
    	  }
    	}
    	sourceMapConsumer.IndexedSourceMapConsumer = IndexedSourceMapConsumer;

    	/*
    	 * Cheat to get around inter-twingled classes.  `factory()` can be at the end
    	 * where it has access to non-hoisted classes, but it gets hoisted itself.
    	 */
    	function _factory(aSourceMap, aSourceMapURL) {
    	  let sourceMap = aSourceMap;
    	  if (typeof aSourceMap === "string") {
    	    sourceMap = util.parseSourceMapInput(aSourceMap);
    	  }

    	  const consumer = sourceMap.sections != null
    	      ? new IndexedSourceMapConsumer(sourceMap, aSourceMapURL)
    	      : new BasicSourceMapConsumer(sourceMap, aSourceMapURL);
    	  return Promise.resolve(consumer);
    	}

    	function _factoryBSM(aSourceMap, aSourceMapURL) {
    	  return BasicSourceMapConsumer.fromSourceMap(aSourceMap, aSourceMapURL);
    	}
    	return sourceMapConsumer;
    }

    var sourceNode = {};

    var hasRequiredSourceNode;

    function requireSourceNode () {
    	if (hasRequiredSourceNode) return sourceNode;
    	hasRequiredSourceNode = 1;
    	/*
    	 * Copyright 2011 Mozilla Foundation and contributors
    	 * Licensed under the New BSD license. See LICENSE or:
    	 * http://opensource.org/licenses/BSD-3-Clause
    	 */

    	const SourceMapGenerator = requireSourceMapGenerator().SourceMapGenerator;
    	const util = requireUtil();

    	// Matches a Windows-style `\r\n` newline or a `\n` newline used by all other
    	// operating systems these days (capturing the result).
    	const REGEX_NEWLINE = /(\r?\n)/;

    	// Newline character code for charCodeAt() comparisons
    	const NEWLINE_CODE = 10;

    	// Private symbol for identifying `SourceNode`s when multiple versions of
    	// the source-map library are loaded. This MUST NOT CHANGE across
    	// versions!
    	const isSourceNode = "$$$isSourceNode$$$";

    	/**
    	 * SourceNodes provide a way to abstract over interpolating/concatenating
    	 * snippets of generated JavaScript source code while maintaining the line and
    	 * column information associated with the original source code.
    	 *
    	 * @param aLine The original line number.
    	 * @param aColumn The original column number.
    	 * @param aSource The original source's filename.
    	 * @param aChunks Optional. An array of strings which are snippets of
    	 *        generated JS, or other SourceNodes.
    	 * @param aName The original identifier.
    	 */
    	class SourceNode {
    	  constructor(aLine, aColumn, aSource, aChunks, aName) {
    	    this.children = [];
    	    this.sourceContents = {};
    	    this.line = aLine == null ? null : aLine;
    	    this.column = aColumn == null ? null : aColumn;
    	    this.source = aSource == null ? null : aSource;
    	    this.name = aName == null ? null : aName;
    	    this[isSourceNode] = true;
    	    if (aChunks != null) this.add(aChunks);
    	  }

    	  /**
    	   * Creates a SourceNode from generated code and a SourceMapConsumer.
    	   *
    	   * @param aGeneratedCode The generated code
    	   * @param aSourceMapConsumer The SourceMap for the generated code
    	   * @param aRelativePath Optional. The path that relative sources in the
    	   *        SourceMapConsumer should be relative to.
    	   */
    	  static fromStringWithSourceMap(aGeneratedCode, aSourceMapConsumer, aRelativePath) {
    	    // The SourceNode we want to fill with the generated code
    	    // and the SourceMap
    	    const node = new SourceNode();

    	    // All even indices of this array are one line of the generated code,
    	    // while all odd indices are the newlines between two adjacent lines
    	    // (since `REGEX_NEWLINE` captures its match).
    	    // Processed fragments are accessed by calling `shiftNextLine`.
    	    const remainingLines = aGeneratedCode.split(REGEX_NEWLINE);
    	    let remainingLinesIndex = 0;
    	    const shiftNextLine = function() {
    	      const lineContents = getNextLine();
    	      // The last line of a file might not have a newline.
    	      const newLine = getNextLine() || "";
    	      return lineContents + newLine;

    	      function getNextLine() {
    	        return remainingLinesIndex < remainingLines.length ?
    	            remainingLines[remainingLinesIndex++] : undefined;
    	      }
    	    };

    	    // We need to remember the position of "remainingLines"
    	    let lastGeneratedLine = 1, lastGeneratedColumn = 0;

    	    // The generate SourceNodes we need a code range.
    	    // To extract it current and last mapping is used.
    	    // Here we store the last mapping.
    	    let lastMapping = null;
    	    let nextLine;

    	    aSourceMapConsumer.eachMapping(function(mapping) {
    	      if (lastMapping !== null) {
    	        // We add the code from "lastMapping" to "mapping":
    	        // First check if there is a new line in between.
    	        if (lastGeneratedLine < mapping.generatedLine) {
    	          // Associate first line with "lastMapping"
    	          addMappingWithCode(lastMapping, shiftNextLine());
    	          lastGeneratedLine++;
    	          lastGeneratedColumn = 0;
    	          // The remaining code is added without mapping
    	        } else {
    	          // There is no new line in between.
    	          // Associate the code between "lastGeneratedColumn" and
    	          // "mapping.generatedColumn" with "lastMapping"
    	          nextLine = remainingLines[remainingLinesIndex] || "";
    	          const code = nextLine.substr(0, mapping.generatedColumn -
    	                                        lastGeneratedColumn);
    	          remainingLines[remainingLinesIndex] = nextLine.substr(mapping.generatedColumn -
    	                                              lastGeneratedColumn);
    	          lastGeneratedColumn = mapping.generatedColumn;
    	          addMappingWithCode(lastMapping, code);
    	          // No more remaining code, continue
    	          lastMapping = mapping;
    	          return;
    	        }
    	      }
    	      // We add the generated code until the first mapping
    	      // to the SourceNode without any mapping.
    	      // Each line is added as separate string.
    	      while (lastGeneratedLine < mapping.generatedLine) {
    	        node.add(shiftNextLine());
    	        lastGeneratedLine++;
    	      }
    	      if (lastGeneratedColumn < mapping.generatedColumn) {
    	        nextLine = remainingLines[remainingLinesIndex] || "";
    	        node.add(nextLine.substr(0, mapping.generatedColumn));
    	        remainingLines[remainingLinesIndex] = nextLine.substr(mapping.generatedColumn);
    	        lastGeneratedColumn = mapping.generatedColumn;
    	      }
    	      lastMapping = mapping;
    	    }, this);
    	    // We have processed all mappings.
    	    if (remainingLinesIndex < remainingLines.length) {
    	      if (lastMapping) {
    	        // Associate the remaining code in the current line with "lastMapping"
    	        addMappingWithCode(lastMapping, shiftNextLine());
    	      }
    	      // and add the remaining lines without any mapping
    	      node.add(remainingLines.splice(remainingLinesIndex).join(""));
    	    }

    	    // Copy sourcesContent into SourceNode
    	    aSourceMapConsumer.sources.forEach(function(sourceFile) {
    	      const content = aSourceMapConsumer.sourceContentFor(sourceFile);
    	      if (content != null) {
    	        if (aRelativePath != null) {
    	          sourceFile = util.join(aRelativePath, sourceFile);
    	        }
    	        node.setSourceContent(sourceFile, content);
    	      }
    	    });

    	    return node;

    	    function addMappingWithCode(mapping, code) {
    	      if (mapping === null || mapping.source === undefined) {
    	        node.add(code);
    	      } else {
    	        const source = aRelativePath
    	          ? util.join(aRelativePath, mapping.source)
    	          : mapping.source;
    	        node.add(new SourceNode(mapping.originalLine,
    	                                mapping.originalColumn,
    	                                source,
    	                                code,
    	                                mapping.name));
    	      }
    	    }
    	  }

    	  /**
    	   * Add a chunk of generated JS to this source node.
    	   *
    	   * @param aChunk A string snippet of generated JS code, another instance of
    	   *        SourceNode, or an array where each member is one of those things.
    	   */
    	  add(aChunk) {
    	    if (Array.isArray(aChunk)) {
    	      aChunk.forEach(function(chunk) {
    	        this.add(chunk);
    	      }, this);
    	    } else if (aChunk[isSourceNode] || typeof aChunk === "string") {
    	      if (aChunk) {
    	        this.children.push(aChunk);
    	      }
    	    } else {
    	      throw new TypeError(
    	        "Expected a SourceNode, string, or an array of SourceNodes and strings. Got " + aChunk
    	      );
    	    }
    	    return this;
    	  }

    	  /**
    	   * Add a chunk of generated JS to the beginning of this source node.
    	   *
    	   * @param aChunk A string snippet of generated JS code, another instance of
    	   *        SourceNode, or an array where each member is one of those things.
    	   */
    	  prepend(aChunk) {
    	    if (Array.isArray(aChunk)) {
    	      for (let i = aChunk.length - 1; i >= 0; i--) {
    	        this.prepend(aChunk[i]);
    	      }
    	    } else if (aChunk[isSourceNode] || typeof aChunk === "string") {
    	      this.children.unshift(aChunk);
    	    } else {
    	      throw new TypeError(
    	        "Expected a SourceNode, string, or an array of SourceNodes and strings. Got " + aChunk
    	      );
    	    }
    	    return this;
    	  }

    	  /**
    	   * Walk over the tree of JS snippets in this node and its children. The
    	   * walking function is called once for each snippet of JS and is passed that
    	   * snippet and the its original associated source's line/column location.
    	   *
    	   * @param aFn The traversal function.
    	   */
    	  walk(aFn) {
    	    let chunk;
    	    for (let i = 0, len = this.children.length; i < len; i++) {
    	      chunk = this.children[i];
    	      if (chunk[isSourceNode]) {
    	        chunk.walk(aFn);
    	      } else if (chunk !== "") {
    	        aFn(chunk, { source: this.source,
    	                      line: this.line,
    	                      column: this.column,
    	                      name: this.name });
    	      }
    	    }
    	  }

    	  /**
    	   * Like `String.prototype.join` except for SourceNodes. Inserts `aStr` between
    	   * each of `this.children`.
    	   *
    	   * @param aSep The separator.
    	   */
    	  join(aSep) {
    	    let newChildren;
    	    let i;
    	    const len = this.children.length;
    	    if (len > 0) {
    	      newChildren = [];
    	      for (i = 0; i < len - 1; i++) {
    	        newChildren.push(this.children[i]);
    	        newChildren.push(aSep);
    	      }
    	      newChildren.push(this.children[i]);
    	      this.children = newChildren;
    	    }
    	    return this;
    	  }

    	  /**
    	   * Call String.prototype.replace on the very right-most source snippet. Useful
    	   * for trimming whitespace from the end of a source node, etc.
    	   *
    	   * @param aPattern The pattern to replace.
    	   * @param aReplacement The thing to replace the pattern with.
    	   */
    	  replaceRight(aPattern, aReplacement) {
    	    const lastChild = this.children[this.children.length - 1];
    	    if (lastChild[isSourceNode]) {
    	      lastChild.replaceRight(aPattern, aReplacement);
    	    } else if (typeof lastChild === "string") {
    	      this.children[this.children.length - 1] = lastChild.replace(aPattern, aReplacement);
    	    } else {
    	      this.children.push("".replace(aPattern, aReplacement));
    	    }
    	    return this;
    	  }

    	  /**
    	   * Set the source content for a source file. This will be added to the SourceMapGenerator
    	   * in the sourcesContent field.
    	   *
    	   * @param aSourceFile The filename of the source file
    	   * @param aSourceContent The content of the source file
    	   */
    	  setSourceContent(aSourceFile, aSourceContent) {
    	    this.sourceContents[util.toSetString(aSourceFile)] = aSourceContent;
    	  }

    	  /**
    	   * Walk over the tree of SourceNodes. The walking function is called for each
    	   * source file content and is passed the filename and source content.
    	   *
    	   * @param aFn The traversal function.
    	   */
    	  walkSourceContents(aFn) {
    	    for (let i = 0, len = this.children.length; i < len; i++) {
    	      if (this.children[i][isSourceNode]) {
    	        this.children[i].walkSourceContents(aFn);
    	      }
    	    }

    	    const sources = Object.keys(this.sourceContents);
    	    for (let i = 0, len = sources.length; i < len; i++) {
    	      aFn(util.fromSetString(sources[i]), this.sourceContents[sources[i]]);
    	    }
    	  }

    	  /**
    	   * Return the string representation of this source node. Walks over the tree
    	   * and concatenates all the various snippets together to one string.
    	   */
    	  toString() {
    	    let str = "";
    	    this.walk(function(chunk) {
    	      str += chunk;
    	    });
    	    return str;
    	  }

    	  /**
    	   * Returns the string representation of this source node along with a source
    	   * map.
    	   */
    	  toStringWithSourceMap(aArgs) {
    	    const generated = {
    	      code: "",
    	      line: 1,
    	      column: 0
    	    };
    	    const map = new SourceMapGenerator(aArgs);
    	    let sourceMappingActive = false;
    	    let lastOriginalSource = null;
    	    let lastOriginalLine = null;
    	    let lastOriginalColumn = null;
    	    let lastOriginalName = null;
    	    this.walk(function(chunk, original) {
    	      generated.code += chunk;
    	      if (original.source !== null
    	          && original.line !== null
    	          && original.column !== null) {
    	        if (lastOriginalSource !== original.source
    	          || lastOriginalLine !== original.line
    	          || lastOriginalColumn !== original.column
    	          || lastOriginalName !== original.name) {
    	          map.addMapping({
    	            source: original.source,
    	            original: {
    	              line: original.line,
    	              column: original.column
    	            },
    	            generated: {
    	              line: generated.line,
    	              column: generated.column
    	            },
    	            name: original.name
    	          });
    	        }
    	        lastOriginalSource = original.source;
    	        lastOriginalLine = original.line;
    	        lastOriginalColumn = original.column;
    	        lastOriginalName = original.name;
    	        sourceMappingActive = true;
    	      } else if (sourceMappingActive) {
    	        map.addMapping({
    	          generated: {
    	            line: generated.line,
    	            column: generated.column
    	          }
    	        });
    	        lastOriginalSource = null;
    	        sourceMappingActive = false;
    	      }
    	      for (let idx = 0, length = chunk.length; idx < length; idx++) {
    	        if (chunk.charCodeAt(idx) === NEWLINE_CODE) {
    	          generated.line++;
    	          generated.column = 0;
    	          // Mappings end at eol
    	          if (idx + 1 === length) {
    	            lastOriginalSource = null;
    	            sourceMappingActive = false;
    	          } else if (sourceMappingActive) {
    	            map.addMapping({
    	              source: original.source,
    	              original: {
    	                line: original.line,
    	                column: original.column
    	              },
    	              generated: {
    	                line: generated.line,
    	                column: generated.column
    	              },
    	              name: original.name
    	            });
    	          }
    	        } else {
    	          generated.column++;
    	        }
    	      }
    	    });
    	    this.walkSourceContents(function(sourceFile, sourceContent) {
    	      map.setSourceContent(sourceFile, sourceContent);
    	    });

    	    return { code: generated.code, map };
    	  }
    	}

    	sourceNode.SourceNode = SourceNode;
    	return sourceNode;
    }

    var hasRequiredSourceMap;

    function requireSourceMap () {
    	if (hasRequiredSourceMap) return sourceMap$1;
    	hasRequiredSourceMap = 1;
    	sourceMap$1.SourceMapGenerator = requireSourceMapGenerator().SourceMapGenerator;
    	sourceMap$1.SourceMapConsumer = requireSourceMapConsumer().SourceMapConsumer;
    	sourceMap$1.SourceNode = requireSourceNode().SourceNode;
    	return sourceMap$1;
    }

    var workerUtils = {exports: {}};

    var hasRequiredWorkerUtils;

    function requireWorkerUtils () {
    	if (hasRequiredWorkerUtils) return workerUtils.exports;
    	hasRequiredWorkerUtils = 1;
    	(function (module) {

    		class WorkerDispatcher {
    		  #msgId = 1;
    		  #worker = null;
    		  // Map of message ids -> promise resolution functions, for dispatching worker responses
    		  #pendingCalls = new Map();
    		  #url = "";

    		  constructor(url) {
    		    this.#url = url;
    		  }

    		  start() {
    		    // When running in debugger jest test, we don't have access to ChromeWorker
    		    if (typeof ChromeWorker == "function") {
    		      this.#worker = new ChromeWorker(this.#url);
    		    } else {
    		      this.#worker = new Worker(this.#url);
    		    }
    		    this.#worker.onerror = err => {
    		      console.error(`Error in worker ${this.#url}`, err.message);
    		    };
    		    this.#worker.addEventListener("message", this.#onMessage);
    		  }

    		  stop() {
    		    if (!this.#worker) {
    		      return;
    		    }

    		    this.#worker.removeEventListener("message", this.#onMessage);
    		    this.#worker.terminate();
    		    this.#worker = null;
    		    this.#pendingCalls.clear();
    		  }

    		  task(method, { queue = false } = {}) {
    		    const calls = [];
    		    const push = args => {
    		      return new Promise((resolve, reject) => {
    		        if (queue && calls.length === 0) {
    		          Promise.resolve().then(flush);
    		        }

    		        calls.push({ args, resolve, reject });

    		        if (!queue) {
    		          flush();
    		        }
    		      });
    		    };

    		    const flush = () => {
    		      const items = calls.slice();
    		      calls.length = 0;

    		      if (!this.#worker) {
    		        this.start();
    		      }

    		      const id = this.#msgId++;
    		      this.#worker.postMessage({
    		        id,
    		        method,
    		        calls: items.map(item => item.args),
    		      });

    		      this.#pendingCalls.set(id, items);
    		    };

    		    return (...args) => push(args);
    		  }

    		  invoke(method, ...args) {
    		    return this.task(method)(...args);
    		  }

    		  #onMessage = ({ data: result }) => {
    		    const items = this.#pendingCalls.get(result.id);
    		    this.#pendingCalls.delete(result.id);
    		    if (!items) {
    		      return;
    		    }

    		    if (!this.#worker) {
    		      return;
    		    }

    		    result.results.forEach((resultData, i) => {
    		      const { resolve, reject } = items[i];

    		      if (resultData.error) {
    		        const err = new Error(resultData.message);
    		        err.metadata = resultData.metadata;
    		        reject(err);
    		      } else {
    		        resolve(resultData.response);
    		      }
    		    });
    		  };
    		}

    		function workerHandler(publicInterface) {
    		  return function (msg) {
    		    const { id, method, calls } = msg.data;

    		    Promise.all(
    		      calls.map(args => {
    		        try {
    		          const response = publicInterface[method].apply(undefined, args);
    		          if (response instanceof Promise) {
    		            return response.then(
    		              val => ({ response: val }),
    		              err => asErrorMessage(err)
    		            );
    		          }
    		          return { response };
    		        } catch (error) {
    		          return asErrorMessage(error);
    		        }
    		      })
    		    ).then(results => {
    		      globalThis.postMessage({ id, results });
    		    });
    		  };
    		}

    		function asErrorMessage(error) {
    		  if (typeof error === "object" && error && "message" in error) {
    		    // Error can't be sent via postMessage, so be sure to convert to
    		    // string.
    		    return {
    		      error: true,
    		      message: error.message,
    		      metadata: error.metadata,
    		    };
    		  }

    		  return {
    		    error: true,
    		    message: error == null ? error : error.toString(),
    		    metadata: undefined,
    		  };
    		}

    		// Might be loaded within a worker thread where `module` isn't available.
    		{
    		  module.exports = {
    		    WorkerDispatcher,
    		    workerHandler,
    		  };
    		} 
    	} (workerUtils));
    	return workerUtils.exports;
    }

    var workerUtilsExports = requireWorkerUtils();

    var acorn$1 = {exports: {}};

    var hasRequiredAcorn;

    function requireAcorn () {
    	if (hasRequiredAcorn) return acorn$1.exports;
    	hasRequiredAcorn = 1;
    	(function (module, exports) {
    		(function (global, factory) {
    		  factory(exports) ;
    		})(commonjsGlobal, (function (exports) {
    		  // This file was generated. Do not modify manually!
    		  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, 370, 1, 81, 2, 71, 10, 50, 3, 123, 2, 54, 14, 32, 10, 3, 1, 11, 3, 46, 10, 8, 0, 46, 9, 7, 2, 37, 13, 2, 9, 6, 1, 45, 0, 13, 2, 49, 13, 9, 3, 2, 11, 83, 11, 7, 0, 3, 0, 158, 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, 71, 5, 2, 1, 3, 3, 2, 0, 2, 1, 13, 9, 120, 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, 10, 1, 2, 0, 49, 6, 4, 4, 14, 9, 5351, 0, 7, 14, 13835, 9, 87, 9, 39, 4, 60, 6, 26, 9, 1014, 0, 2, 54, 8, 3, 82, 0, 12, 1, 19628, 1, 4706, 45, 3, 22, 543, 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, 101, 0, 161, 6, 10, 9, 357, 0, 62, 13, 499, 13, 983, 6, 110, 6, 6, 9, 4759, 9, 787719, 239];

    		  // This file was generated. Do not modify manually!
    		  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, 13, 10, 2, 14, 2, 6, 2, 1, 2, 10, 2, 14, 2, 6, 2, 1, 68, 310, 10, 21, 11, 7, 25, 5, 2, 41, 2, 8, 70, 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, 349, 41, 7, 1, 79, 28, 11, 0, 9, 21, 43, 17, 47, 20, 28, 22, 13, 52, 58, 1, 3, 0, 14, 44, 33, 24, 27, 35, 30, 0, 3, 0, 9, 34, 4, 0, 13, 47, 15, 3, 22, 0, 2, 0, 36, 17, 2, 24, 20, 1, 64, 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, 2, 31, 47, 21, 1, 2, 0, 185, 46, 42, 3, 37, 47, 21, 0, 60, 42, 14, 0, 72, 26, 38, 6, 186, 43, 117, 63, 32, 7, 3, 0, 3, 7, 2, 1, 2, 23, 16, 0, 2, 0, 95, 7, 3, 38, 17, 0, 2, 0, 29, 0, 11, 39, 8, 0, 22, 0, 12, 45, 20, 0, 19, 72, 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, 16, 0, 2, 12, 2, 33, 125, 0, 80, 921, 103, 110, 18, 195, 2637, 96, 16, 1071, 18, 5, 4026, 582, 8634, 568, 8, 30, 18, 78, 18, 29, 19, 47, 17, 3, 32, 20, 6, 18, 689, 63, 129, 74, 6, 0, 67, 12, 65, 1, 2, 0, 29, 6135, 9, 1237, 43, 8, 8936, 3, 2, 6, 2, 1, 2, 290, 16, 0, 30, 2, 3, 0, 15, 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, 1845, 30, 7, 5, 262, 61, 147, 44, 11, 6, 17, 0, 322, 29, 19, 43, 485, 27, 757, 6, 2, 3, 2, 1, 2, 14, 2, 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, 42719, 33, 4153, 7, 221, 3, 5761, 15, 7472, 3104, 541, 1507, 4938, 6, 4191];

    		  // This file was generated. Do not modify manually!
    		  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\u0898-\u089f\u08ca-\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\u0b55-\u0b57\u0b62\u0b63\u0b66-\u0b6f\u0b82\u0bbe-\u0bc2\u0bc6-\u0bc8\u0bca-\u0bcd\u0bd7\u0be6-\u0bef\u0c00-\u0c04\u0c3c\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\u0cf3\u0d00-\u0d03\u0d3b\u0d3c\u0d3e-\u0d44\u0d46-\u0d48\u0d4a-\u0d4d\u0d57\u0d62\u0d63\u0d66-\u0d6f\u0d81-\u0d83\u0dca\u0dcf-\u0dd4\u0dd6\u0dd8-\u0ddf\u0de6-\u0def\u0df2\u0df3\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0e50-\u0e59\u0eb1\u0eb4-\u0ebc\u0ec8-\u0ece\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-\u1715\u1732-\u1734\u1752\u1753\u1772\u1773\u17b4-\u17d3\u17dd\u17e0-\u17e9\u180b-\u180d\u180f-\u1819\u18a9\u1920-\u192b\u1930-\u193b\u1946-\u194f\u19d0-\u19da\u1a17-\u1a1b\u1a55-\u1a5e\u1a60-\u1a7c\u1a7f-\u1a89\u1a90-\u1a99\u1ab0-\u1abd\u1abf-\u1ace\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-\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\ua82c\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";

    		  // This file was generated. Do not modify manually!
    		  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\u0870-\u0887\u0889-\u088e\u08a0-\u08c9\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\u0c5d\u0c60\u0c61\u0c80\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cdd\u0cde\u0ce0\u0ce1\u0cf1\u0cf2\u0d04-\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-\u1711\u171f-\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-\u1b4c\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-\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-\u31bf\u31f0-\u31ff\u3400-\u4dbf\u4e00-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua69d\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua7ca\ua7d0\ua7d1\ua7d3\ua7d5-\ua7d9\ua7f2-\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-\uab69\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";

    		  // These are a run-length and offset encoded representation of the

    		  // 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$1 = {
    		    5: ecma5AndLessKeywords,
    		    "5module": ecma5AndLessKeywords + " export import",
    		    6: ecma5AndLessKeywords + " const class extends export import super"
    		  };

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

    		  // ## Character categories

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

    		  // 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 }
    		    }
    		    return false
    		  }

    		  // 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 = {};

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

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

    		  var types$1 = {
    		    num: new TokenType("num", startsExpr),
    		    regexp: new TokenType("regexp", startsExpr),
    		    string: new TokenType("string", startsExpr),
    		    name: new TokenType("name", startsExpr),
    		    privateId: new TokenType("privateId", 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),
    		    questionDot: new TokenType("?."),
    		    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}),
    		    coalesce: binop("??", 1),

    		    // 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) {
    		    return code === 10 || code === 13 || code === 0x2028 || code === 0x2029
    		  }

    		  function nextLineBreak(code, from, end) {
    		    if ( end === void 0 ) end = code.length;

    		    for (var i = from; i < end; i++) {
    		      var next = code.charCodeAt(i);
    		      if (isNewLine(next))
    		        { return i < end - 1 && next === 13 && code.charCodeAt(i + 1) === 10 ? i + 2 : i + 1 }
    		    }
    		    return -1
    		  }

    		  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;

    		  var hasOwn = Object.hasOwn || (function (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, "|") + ")$")
    		  }

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

    		  var loneSurrogate = /(?:[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF])/;

    		  // 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;;) {
    		      var nextBreak = nextLineBreak(input, cur, offset);
    		      if (nextBreak < 0) { return new Position(line, offset - cur) }
    		      ++line;
    		      cur = nextBreak;
    		    }
    		  }

    		  // A second argument must be given to configure the parser process.
    		  // These options are recognized (only `ecmaVersion` is required):

    		  var defaultOptions = {
    		    // `ecmaVersion` indicates the ECMAScript version to parse. Must be
    		    // either 3, 5, 6 (or 2015), 7 (2016), 8 (2017), 9 (2018), 10
    		    // (2019), 11 (2020), 12 (2021), 13 (2022), 14 (2023), or `"latest"`
    		    // (the latest version the library supports). This influences
    		    // support for strict mode, the set of reserved words, and support
    		    // for new syntax features.
    		    ecmaVersion: null,
    		    // `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, and an import.meta expression
    		    // in a script isn't considered an error.
    		    allowImportExportEverywhere: false,
    		    // By default, await identifiers are allowed to appear at the top-level scope only if ecmaVersion >= 2022.
    		    // When enabled, await identifiers are allowed to appear at the top-level scope,
    		    // but they are still not allowed in non-async functions.
    		    allowAwaitOutsideFunction: null,
    		    // When enabled, super identifiers are not constrained to
    		    // appearing in methods and do not raise an error when they appear elsewhere.
    		    allowSuperOutsideMethod: null,
    		    // When enabled, hashbang directive in the beginning of file is
    		    // allowed and treated as a line comment. Enabled by default when
    		    // `ecmaVersion` >= 2023.
    		    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

    		  var warnedAboutEcmaVersion = false;

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

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

    		    if (options.ecmaVersion === "latest") {
    		      options.ecmaVersion = 1e8;
    		    } else if (options.ecmaVersion == null) {
    		      if (!warnedAboutEcmaVersion && typeof console === "object" && console.warn) {
    		        warnedAboutEcmaVersion = true;
    		        console.warn("Since Acorn 8.0.0, options.ecmaVersion is required.\nDefaulting to 2020, but this will stop working in the future.");
    		      }
    		      options.ecmaVersion = 11;
    		    } else if (options.ecmaVersion >= 2015) {
    		      options.ecmaVersion -= 2009;
    		    }

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

    		    if (!opts || opts.allowHashBang == null)
    		      { options.allowHashBang = options.ecmaVersion >= 14; }

    		    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_ASYNC = 4,
    		      SCOPE_GENERATOR = 8,
    		      SCOPE_ARROW = 16,
    		      SCOPE_SIMPLE_CATCH = 32,
    		      SCOPE_SUPER = 64,
    		      SCOPE_DIRECT_SUPER = 128,
    		      SCOPE_CLASS_STATIC_BLOCK = 256,
    		      SCOPE_VAR = SCOPE_TOP | SCOPE_FUNCTION | SCOPE_CLASS_STATIC_BLOCK;

    		  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$1[options.ecmaVersion >= 6 ? 6 : options.sourceType === "module" ? "5module" : 5]);
    		    var reserved = "";
    		    if (options.allowReserved !== true) {
    		      reserved = reservedWords[options.ecmaVersion >= 6 ? 6 : options.ecmaVersion === 5 ? 5 : 3];
    		      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$1.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;
    		    this.potentialArrowInForAwait = false;

    		    // 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 = Object.create(null);

    		    // 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;

    		    // The stack of private names.
    		    // Each element has two properties: 'declared' and 'used'.
    		    // When it exited from the outermost class definition, all used private names must be declared.
    		    this.privateNameStack = [];
    		  };

    		  var prototypeAccessors = { inFunction: { configurable: true },inGenerator: { configurable: true },inAsync: { configurable: true },canAwait: { configurable: true },allowSuper: { configurable: true },allowDirectSuper: { configurable: true },treatFunctionsAsVar: { configurable: true },allowNewDotTarget: { configurable: true },inClassStaticBlock: { 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 && !this.currentVarScope().inClassFieldInit };

    		  prototypeAccessors.inAsync.get = function () { return (this.currentVarScope().flags & SCOPE_ASYNC) > 0 && !this.currentVarScope().inClassFieldInit };

    		  prototypeAccessors.canAwait.get = function () {
    		    for (var i = this.scopeStack.length - 1; i >= 0; i--) {
    		      var scope = this.scopeStack[i];
    		      if (scope.inClassFieldInit || scope.flags & SCOPE_CLASS_STATIC_BLOCK) { return false }
    		      if (scope.flags & SCOPE_FUNCTION) { return (scope.flags & SCOPE_ASYNC) > 0 }
    		    }
    		    return (this.inModule && this.options.ecmaVersion >= 13) || this.options.allowAwaitOutsideFunction
    		  };

    		  prototypeAccessors.allowSuper.get = function () {
    		    var ref = this.currentThisScope();
    		      var flags = ref.flags;
    		      var inClassFieldInit = ref.inClassFieldInit;
    		    return (flags & SCOPE_SUPER) > 0 || inClassFieldInit || this.options.allowSuperOutsideMethod
    		  };

    		  prototypeAccessors.allowDirectSuper.get = function () { return (this.currentThisScope().flags & SCOPE_DIRECT_SUPER) > 0 };

    		  prototypeAccessors.treatFunctionsAsVar.get = function () { return this.treatFunctionsAsVarInScope(this.currentScope()) };

    		  prototypeAccessors.allowNewDotTarget.get = function () {
    		    var ref = this.currentThisScope();
    		      var flags = ref.flags;
    		      var inClassFieldInit = ref.inClassFieldInit;
    		    return (flags & (SCOPE_FUNCTION | SCOPE_CLASS_STATIC_BLOCK)) > 0 || inClassFieldInit
    		  };

    		  prototypeAccessors.inClassStaticBlock.get = function () {
    		    return (this.currentVarScope().flags & SCOPE_CLASS_STATIC_BLOCK) > 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$9 = Parser.prototype;

    		  // ## Parser utilities

    		  var literal = /^(?:'((?:\\.|[^'\\])*?)'|"((?:\\.|[^"\\])*?)")/;
    		  pp$9.strictDirective = function(start) {
    		    if (this.options.ecmaVersion < 5) { return false }
    		    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") {
    		        skipWhiteSpace.lastIndex = start + match[0].length;
    		        var spaceAfter = skipWhiteSpace.exec(this.input), end = spaceAfter.index + spaceAfter[0].length;
    		        var next = this.input.charAt(end);
    		        return next === ";" || next === "}" ||
    		          (lineBreak.test(spaceAfter[0]) &&
    		           !(/[(`.[+\-/*%<>=,?^&]/.test(next) || next === "!" && this.input.charAt(end + 1) === "="))
    		      }
    		      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$9.eat = function(type) {
    		    if (this.type === type) {
    		      this.next();
    		      return true
    		    } else {
    		      return false
    		    }
    		  };

    		  // Tests whether parsed token is a contextual keyword.

    		  pp$9.isContextual = function(name) {
    		    return this.type === types$1.name && this.value === name && !this.containsEsc
    		  };

    		  // Consumes contextual keyword if possible.

    		  pp$9.eatContextual = function(name) {
    		    if (!this.isContextual(name)) { return false }
    		    this.next();
    		    return true
    		  };

    		  // Asserts that following token is given contextual keyword.

    		  pp$9.expectContextual = function(name) {
    		    if (!this.eatContextual(name)) { this.unexpected(); }
    		  };

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

    		  pp$9.canInsertSemicolon = function() {
    		    return this.type === types$1.eof ||
    		      this.type === types$1.braceR ||
    		      lineBreak.test(this.input.slice(this.lastTokEnd, this.start))
    		  };

    		  pp$9.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$9.semicolon = function() {
    		    if (!this.eat(types$1.semi) && !this.insertSemicolon()) { this.unexpected(); }
    		  };

    		  pp$9.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$9.expect = function(type) {
    		    this.eat(type) || this.unexpected();
    		  };

    		  // Raise an unexpected token error.

    		  pp$9.unexpected = function(pos) {
    		    this.raise(pos != null ? pos : this.start, "Unexpected token");
    		  };

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

    		  pp$9.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, isAssign ? "Assigning to rvalue" : "Parenthesized pattern"); }
    		  };

    		  pp$9.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$9.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$9.isSimpleAssignTarget = function(expr) {
    		    if (expr.type === "ParenthesizedExpression")
    		      { return this.isSimpleAssignTarget(expr.expression) }
    		    return expr.type === "Identifier" || expr.type === "MemberExpression"
    		  };

    		  var pp$8 = 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$8.parseTopLevel = function(node) {
    		    var exports = Object.create(null);
    		    if (!node.body) { node.body = []; }
    		    while (this.type !== types$1.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$8.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 || nextCh === 92) { return true } // '[', '/'
    		    if (context) { return false }

    		    if (nextCh === 123 || nextCh > 0xd7ff && nextCh < 0xdc00) { return true } // '{', astral
    		    if (isIdentifierStart(nextCh, true)) {
    		      var pos = next + 1;
    		      while (isIdentifierChar(nextCh = this.input.charCodeAt(pos), true)) { ++pos; }
    		      if (nextCh === 92 || nextCh > 0xd7ff && nextCh < 0xdc00) { return true }
    		      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$8.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, after;
    		    return !lineBreak.test(this.input.slice(this.pos, next)) &&
    		      this.input.slice(next, next + 8) === "function" &&
    		      (next + 8 === this.input.length ||
    		       !(isIdentifierChar(after = this.input.charCodeAt(next + 8)) || after > 0xd7ff && after < 0xdc00))
    		  };

    		  // 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$8.parseStatement = function(context, topLevel, exports) {
    		    var starttype = this.type, node = this.startNode(), kind;

    		    if (this.isLet(context)) {
    		      starttype = types$1._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$1._break: case types$1._continue: return this.parseBreakContinueStatement(node, starttype.keyword)
    		    case types$1._debugger: return this.parseDebuggerStatement(node)
    		    case types$1._do: return this.parseDoStatement(node)
    		    case types$1._for: return this.parseForStatement(node)
    		    case types$1._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$1._class:
    		      if (context) { this.unexpected(); }
    		      return this.parseClass(node, true)
    		    case types$1._if: return this.parseIfStatement(node)
    		    case types$1._return: return this.parseReturnStatement(node)
    		    case types$1._switch: return this.parseSwitchStatement(node)
    		    case types$1._throw: return this.parseThrowStatement(node)
    		    case types$1._try: return this.parseTryStatement(node)
    		    case types$1._const: case types$1._var:
    		      kind = kind || this.value;
    		      if (context && kind !== "var") { this.unexpected(); }
    		      return this.parseVarStatement(node, kind)
    		    case types$1._while: return this.parseWhileStatement(node)
    		    case types$1._with: return this.parseWithStatement(node)
    		    case types$1.braceL: return this.parseBlock(true, node)
    		    case types$1.semi: return this.parseEmptyStatement(node)
    		    case types$1._export:
    		    case types$1._import:
    		      if (this.options.ecmaVersion > 10 && starttype === types$1._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 || nextCh === 46) // '(' or '.'
    		          { 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$1._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$1.name && expr.type === "Identifier" && this.eat(types$1.colon))
    		        { return this.parseLabeledStatement(node, maybeName, expr, context) }
    		      else { return this.parseExpressionStatement(node, expr) }
    		    }
    		  };

    		  pp$8.parseBreakContinueStatement = function(node, keyword) {
    		    var isBreak = keyword === "break";
    		    this.next();
    		    if (this.eat(types$1.semi) || this.insertSemicolon()) { node.label = null; }
    		    else if (this.type !== types$1.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$8.parseDebuggerStatement = function(node) {
    		    this.next();
    		    this.semicolon();
    		    return this.finishNode(node, "DebuggerStatement")
    		  };

    		  pp$8.parseDoStatement = function(node) {
    		    this.next();
    		    this.labels.push(loopLabel);
    		    node.body = this.parseStatement("do");
    		    this.labels.pop();
    		    this.expect(types$1._while);
    		    node.test = this.parseParenExpression();
    		    if (this.options.ecmaVersion >= 6)
    		      { this.eat(types$1.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$8.parseForStatement = function(node) {
    		    this.next();
    		    var awaitAt = (this.options.ecmaVersion >= 9 && this.canAwait && this.eatContextual("await")) ? this.lastTokStart : -1;
    		    this.labels.push(loopLabel);
    		    this.enterScope(0);
    		    this.expect(types$1.parenL);
    		    if (this.type === types$1.semi) {
    		      if (awaitAt > -1) { this.unexpected(awaitAt); }
    		      return this.parseFor(node, null)
    		    }
    		    var isLet = this.isLet();
    		    if (this.type === types$1._var || this.type === types$1._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$1._in || (this.options.ecmaVersion >= 6 && this.isContextual("of"))) && init$1.declarations.length === 1) {
    		        if (this.options.ecmaVersion >= 9) {
    		          if (this.type === types$1._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 startsWithLet = this.isContextual("let"), isForOf = false;
    		    var refDestructuringErrors = new DestructuringErrors;
    		    var init = this.parseExpression(awaitAt > -1 ? "await" : true, refDestructuringErrors);
    		    if (this.type === types$1._in || (isForOf = this.options.ecmaVersion >= 6 && this.isContextual("of"))) {
    		      if (this.options.ecmaVersion >= 9) {
    		        if (this.type === types$1._in) {
    		          if (awaitAt > -1) { this.unexpected(awaitAt); }
    		        } else { node.await = awaitAt > -1; }
    		      }
    		      if (startsWithLet && isForOf) { this.raise(init.start, "The left-hand side of a for-of loop may not start with 'let'."); }
    		      this.toAssignable(init, false, refDestructuringErrors);
    		      this.checkLValPattern(init);
    		      return this.parseForIn(node, init)
    		    } else {
    		      this.checkExpressionErrors(refDestructuringErrors, true);
    		    }
    		    if (awaitAt > -1) { this.unexpected(awaitAt); }
    		    return this.parseFor(node, init)
    		  };

    		  pp$8.parseFunctionStatement = function(node, isAsync, declarationPosition) {
    		    this.next();
    		    return this.parseFunction(node, FUNC_STATEMENT | (declarationPosition ? 0 : FUNC_HANGING_STATEMENT), false, isAsync)
    		  };

    		  pp$8.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$1._else) ? this.parseStatement("if") : null;
    		    return this.finishNode(node, "IfStatement")
    		  };

    		  pp$8.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$1.semi) || this.insertSemicolon()) { node.argument = null; }
    		    else { node.argument = this.parseExpression(); this.semicolon(); }
    		    return this.finishNode(node, "ReturnStatement")
    		  };

    		  pp$8.parseSwitchStatement = function(node) {
    		    this.next();
    		    node.discriminant = this.parseParenExpression();
    		    node.cases = [];
    		    this.expect(types$1.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$1.braceR;) {
    		      if (this.type === types$1._case || this.type === types$1._default) {
    		        var isCase = this.type === types$1._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$1.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$8.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$1 = [];

    		  pp$8.parseTryStatement = function(node) {
    		    this.next();
    		    node.block = this.parseBlock();
    		    node.handler = null;
    		    if (this.type === types$1._catch) {
    		      var clause = this.startNode();
    		      this.next();
    		      if (this.eat(types$1.parenL)) {
    		        clause.param = this.parseBindingAtom();
    		        var simple = clause.param.type === "Identifier";
    		        this.enterScope(simple ? SCOPE_SIMPLE_CATCH : 0);
    		        this.checkLValPattern(clause.param, simple ? BIND_SIMPLE_CATCH : BIND_LEXICAL);
    		        this.expect(types$1.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$1._finally) ? this.parseBlock() : null;
    		    if (!node.handler && !node.finalizer)
    		      { this.raise(node.start, "Missing catch or finally clause"); }
    		    return this.finishNode(node, "TryStatement")
    		  };

    		  pp$8.parseVarStatement = function(node, kind) {
    		    this.next();
    		    this.parseVar(node, false, kind);
    		    this.semicolon();
    		    return this.finishNode(node, "VariableDeclaration")
    		  };

    		  pp$8.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$8.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$8.parseEmptyStatement = function(node) {
    		    this.next();
    		    return this.finishNode(node, "EmptyStatement")
    		  };

    		  pp$8.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$1._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$8.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$8.parseBlock = function(createNewLexicalScope, node, exitStrict) {
    		    if ( createNewLexicalScope === void 0 ) createNewLexicalScope = true;
    		    if ( node === void 0 ) node = this.startNode();

    		    node.body = [];
    		    this.expect(types$1.braceL);
    		    if (createNewLexicalScope) { this.enterScope(0); }
    		    while (this.type !== types$1.braceR) {
    		      var stmt = this.parseStatement(null);
    		      node.body.push(stmt);
    		    }
    		    if (exitStrict) { this.strict = false; }
    		    this.next();
    		    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$8.parseFor = function(node, init) {
    		    node.init = init;
    		    this.expect(types$1.semi);
    		    node.test = this.type === types$1.semi ? null : this.parseExpression();
    		    this.expect(types$1.semi);
    		    node.update = this.type === types$1.parenR ? null : this.parseExpression();
    		    this.expect(types$1.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$8.parseForIn = function(node, init) {
    		    var isForIn = this.type === types$1._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")
    		      );
    		    }
    		    node.left = init;
    		    node.right = isForIn ? this.parseExpression() : this.parseMaybeAssign();
    		    this.expect(types$1.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$8.parseVar = function(node, isFor, kind) {
    		    node.declarations = [];
    		    node.kind = kind;
    		    for (;;) {
    		      var decl = this.startNode();
    		      this.parseVarId(decl, kind);
    		      if (this.eat(types$1.eq)) {
    		        decl.init = this.parseMaybeAssign(isFor);
    		      } else if (kind === "const" && !(this.type === types$1._in || (this.options.ecmaVersion >= 6 && this.isContextual("of")))) {
    		        this.unexpected();
    		      } else if (decl.id.type !== "Identifier" && !(isFor && (this.type === types$1._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$1.comma)) { break }
    		    }
    		    return node
    		  };

    		  pp$8.parseVarId = function(decl, kind) {
    		    decl.id = this.parseBindingAtom();
    		    this.checkLValPattern(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$8.parseFunction = function(node, statement, allowExpressionBody, isAsync, forInit) {
    		    this.initFunction(node);
    		    if (this.options.ecmaVersion >= 9 || this.options.ecmaVersion >= 6 && !isAsync) {
    		      if (this.type === types$1.star && (statement & FUNC_HANGING_STATEMENT))
    		        { this.unexpected(); }
    		      node.generator = this.eat(types$1.star);
    		    }
    		    if (this.options.ecmaVersion >= 8)
    		      { node.async = !!isAsync; }

    		    if (statement & FUNC_STATEMENT) {
    		      node.id = (statement & FUNC_NULLABLE_ID) && this.type !== types$1.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.checkLValSimple(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$1.name ? this.parseIdent() : null; }

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

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

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

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

    		  pp$8.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 privateNameMap = this.enterClassBody();
    		    var classBody = this.startNode();
    		    var hadConstructor = false;
    		    classBody.body = [];
    		    this.expect(types$1.braceL);
    		    while (this.type !== types$1.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;
    		        } else if (element.key && element.key.type === "PrivateIdentifier" && isPrivateNameConflicted(privateNameMap, element)) {
    		          this.raiseRecoverable(element.key.start, ("Identifier '#" + (element.key.name) + "' has already been declared"));
    		        }
    		      }
    		    }
    		    this.strict = oldStrict;
    		    this.next();
    		    node.body = this.finishNode(classBody, "ClassBody");
    		    this.exitClassBody();
    		    return this.finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression")
    		  };

    		  pp$8.parseClassElement = function(constructorAllowsSuper) {
    		    if (this.eat(types$1.semi)) { return null }

    		    var ecmaVersion = this.options.ecmaVersion;
    		    var node = this.startNode();
    		    var keyName = "";
    		    var isGenerator = false;
    		    var isAsync = false;
    		    var kind = "method";
    		    var isStatic = false;

    		    if (this.eatContextual("static")) {
    		      // Parse static init block
    		      if (ecmaVersion >= 13 && this.eat(types$1.braceL)) {
    		        this.parseClassStaticBlock(node);
    		        return node
    		      }
    		      if (this.isClassElementNameStart() || this.type === types$1.star) {
    		        isStatic = true;
    		      } else {
    		        keyName = "static";
    		      }
    		    }
    		    node.static = isStatic;
    		    if (!keyName && ecmaVersion >= 8 && this.eatContextual("async")) {
    		      if ((this.isClassElementNameStart() || this.type === types$1.star) && !this.canInsertSemicolon()) {
    		        isAsync = true;
    		      } else {
    		        keyName = "async";
    		      }
    		    }
    		    if (!keyName && (ecmaVersion >= 9 || !isAsync) && this.eat(types$1.star)) {
    		      isGenerator = true;
    		    }
    		    if (!keyName && !isAsync && !isGenerator) {
    		      var lastValue = this.value;
    		      if (this.eatContextual("get") || this.eatContextual("set")) {
    		        if (this.isClassElementNameStart()) {
    		          kind = lastValue;
    		        } else {
    		          keyName = lastValue;
    		        }
    		      }
    		    }

    		    // Parse element name
    		    if (keyName) {
    		      // 'async', 'get', 'set', or 'static' were not a keyword contextually.
    		      // The last token is any of those. Make it the element name.
    		      node.computed = false;
    		      node.key = this.startNodeAt(this.lastTokStart, this.lastTokStartLoc);
    		      node.key.name = keyName;
    		      this.finishNode(node.key, "Identifier");
    		    } else {
    		      this.parseClassElementName(node);
    		    }

    		    // Parse element value
    		    if (ecmaVersion < 13 || this.type === types$1.parenL || kind !== "method" || isGenerator || isAsync) {
    		      var isConstructor = !node.static && checkKeyName(node, "constructor");
    		      var allowsDirectSuper = isConstructor && constructorAllowsSuper;
    		      // Couldn't move this check into the 'parseClassMethod' method for backward compatibility.
    		      if (isConstructor && kind !== "method") { this.raise(node.key.start, "Constructor can't have get/set modifier"); }
    		      node.kind = isConstructor ? "constructor" : kind;
    		      this.parseClassMethod(node, isGenerator, isAsync, allowsDirectSuper);
    		    } else {
    		      this.parseClassField(node);
    		    }

    		    return node
    		  };

    		  pp$8.isClassElementNameStart = function() {
    		    return (
    		      this.type === types$1.name ||
    		      this.type === types$1.privateId ||
    		      this.type === types$1.num ||
    		      this.type === types$1.string ||
    		      this.type === types$1.bracketL ||
    		      this.type.keyword
    		    )
    		  };

    		  pp$8.parseClassElementName = function(element) {
    		    if (this.type === types$1.privateId) {
    		      if (this.value === "constructor") {
    		        this.raise(this.start, "Classes can't have an element named '#constructor'");
    		      }
    		      element.computed = false;
    		      element.key = this.parsePrivateIdent();
    		    } else {
    		      this.parsePropertyName(element);
    		    }
    		  };

    		  pp$8.parseClassMethod = function(method, isGenerator, isAsync, allowsDirectSuper) {
    		    // Check key and flags
    		    var key = method.key;
    		    if (method.kind === "constructor") {
    		      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"); }
    		    } else if (method.static && checkKeyName(method, "prototype")) {
    		      this.raise(key.start, "Classes may not have a static property named prototype");
    		    }

    		    // Parse value
    		    var value = method.value = this.parseMethod(isGenerator, isAsync, allowsDirectSuper);

    		    // Check value
    		    if (method.kind === "get" && value.params.length !== 0)
    		      { this.raiseRecoverable(value.start, "getter should have no params"); }
    		    if (method.kind === "set" && value.params.length !== 1)
    		      { this.raiseRecoverable(value.start, "setter should have exactly one param"); }
    		    if (method.kind === "set" && value.params[0].type === "RestElement")
    		      { this.raiseRecoverable(value.params[0].start, "Setter cannot use rest params"); }

    		    return this.finishNode(method, "MethodDefinition")
    		  };

    		  pp$8.parseClassField = function(field) {
    		    if (checkKeyName(field, "constructor")) {
    		      this.raise(field.key.start, "Classes can't have a field named 'constructor'");
    		    } else if (field.static && checkKeyName(field, "prototype")) {
    		      this.raise(field.key.start, "Classes can't have a static field named 'prototype'");
    		    }

    		    if (this.eat(types$1.eq)) {
    		      // To raise SyntaxError if 'arguments' exists in the initializer.
    		      var scope = this.currentThisScope();
    		      var inClassFieldInit = scope.inClassFieldInit;
    		      scope.inClassFieldInit = true;
    		      field.value = this.parseMaybeAssign();
    		      scope.inClassFieldInit = inClassFieldInit;
    		    } else {
    		      field.value = null;
    		    }
    		    this.semicolon();

    		    return this.finishNode(field, "PropertyDefinition")
    		  };

    		  pp$8.parseClassStaticBlock = function(node) {
    		    node.body = [];

    		    var oldLabels = this.labels;
    		    this.labels = [];
    		    this.enterScope(SCOPE_CLASS_STATIC_BLOCK | SCOPE_SUPER);
    		    while (this.type !== types$1.braceR) {
    		      var stmt = this.parseStatement(null);
    		      node.body.push(stmt);
    		    }
    		    this.next();
    		    this.exitScope();
    		    this.labels = oldLabels;

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

    		  pp$8.parseClassId = function(node, isStatement) {
    		    if (this.type === types$1.name) {
    		      node.id = this.parseIdent();
    		      if (isStatement)
    		        { this.checkLValSimple(node.id, BIND_LEXICAL, false); }
    		    } else {
    		      if (isStatement === true)
    		        { this.unexpected(); }
    		      node.id = null;
    		    }
    		  };

    		  pp$8.parseClassSuper = function(node) {
    		    node.superClass = this.eat(types$1._extends) ? this.parseExprSubscripts(null, false) : null;
    		  };

    		  pp$8.enterClassBody = function() {
    		    var element = {declared: Object.create(null), used: []};
    		    this.privateNameStack.push(element);
    		    return element.declared
    		  };

    		  pp$8.exitClassBody = function() {
    		    var ref = this.privateNameStack.pop();
    		    var declared = ref.declared;
    		    var used = ref.used;
    		    var len = this.privateNameStack.length;
    		    var parent = len === 0 ? null : this.privateNameStack[len - 1];
    		    for (var i = 0; i < used.length; ++i) {
    		      var id = used[i];
    		      if (!hasOwn(declared, id.name)) {
    		        if (parent) {
    		          parent.used.push(id);
    		        } else {
    		          this.raiseRecoverable(id.start, ("Private field '#" + (id.name) + "' must be declared in an enclosing class"));
    		        }
    		      }
    		    }
    		  };

    		  function isPrivateNameConflicted(privateNameMap, element) {
    		    var name = element.key.name;
    		    var curr = privateNameMap[name];

    		    var next = "true";
    		    if (element.type === "MethodDefinition" && (element.kind === "get" || element.kind === "set")) {
    		      next = (element.static ? "s" : "i") + element.kind;
    		    }

    		    // `class { get #a(){}; static set #a(_){} }` is also conflict.
    		    if (
    		      curr === "iget" && next === "iset" ||
    		      curr === "iset" && next === "iget" ||
    		      curr === "sget" && next === "sset" ||
    		      curr === "sset" && next === "sget"
    		    ) {
    		      privateNameMap[name] = "true";
    		      return false
    		    } else if (!curr) {
    		      privateNameMap[name] = next;
    		      return false
    		    } else {
    		      return true
    		    }
    		  }

    		  function checkKeyName(node, name) {
    		    var computed = node.computed;
    		    var key = node.key;
    		    return !computed && (
    		      key.type === "Identifier" && key.name === name ||
    		      key.type === "Literal" && key.value === name
    		    )
    		  }

    		  // Parses module export declaration.

    		  pp$8.parseExport = function(node, exports) {
    		    this.next();
    		    // export * from '...'
    		    if (this.eat(types$1.star)) {
    		      if (this.options.ecmaVersion >= 11) {
    		        if (this.eatContextual("as")) {
    		          node.exported = this.parseModuleExportName();
    		          this.checkExport(exports, node.exported, this.lastTokStart);
    		        } else {
    		          node.exported = null;
    		        }
    		      }
    		      this.expectContextual("from");
    		      if (this.type !== types$1.string) { this.unexpected(); }
    		      node.source = this.parseExprAtom();
    		      this.semicolon();
    		      return this.finishNode(node, "ExportAllDeclaration")
    		    }
    		    if (this.eat(types$1._default)) { // export default ...
    		      this.checkExport(exports, "default", this.lastTokStart);
    		      var isAsync;
    		      if (this.type === types$1._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$1._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, 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$1.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);

    		          if (spec.local.type === "Literal") {
    		            this.raise(spec.local.start, "A string literal cannot be used as an exported binding without `from`.");
    		          }
    		        }

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

    		  pp$8.checkExport = function(exports, name, pos) {
    		    if (!exports) { return }
    		    if (typeof name !== "string")
    		      { name = name.type === "Identifier" ? name.name : name.value; }
    		    if (hasOwn(exports, name))
    		      { this.raiseRecoverable(pos, "Duplicate export '" + name + "'"); }
    		    exports[name] = true;
    		  };

    		  pp$8.checkPatternExport = function(exports, pat) {
    		    var type = pat.type;
    		    if (type === "Identifier")
    		      { this.checkExport(exports, pat, 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$8.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$8.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$8.parseExportSpecifiers = function(exports) {
    		    var nodes = [], first = true;
    		    // export { x, y as z } [from '...']
    		    this.expect(types$1.braceL);
    		    while (!this.eat(types$1.braceR)) {
    		      if (!first) {
    		        this.expect(types$1.comma);
    		        if (this.afterTrailingComma(types$1.braceR)) { break }
    		      } else { first = false; }

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

    		  // Parses import declaration.

    		  pp$8.parseImport = function(node) {
    		    this.next();
    		    // import '...'
    		    if (this.type === types$1.string) {
    		      node.specifiers = empty$1;
    		      node.source = this.parseExprAtom();
    		    } else {
    		      node.specifiers = this.parseImportSpecifiers();
    		      this.expectContextual("from");
    		      node.source = this.type === types$1.string ? this.parseExprAtom() : this.unexpected();
    		    }
    		    this.semicolon();
    		    return this.finishNode(node, "ImportDeclaration")
    		  };

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

    		  pp$8.parseImportSpecifiers = function() {
    		    var nodes = [], first = true;
    		    if (this.type === types$1.name) {
    		      // import defaultObj, { x, y as z } from '...'
    		      var node = this.startNode();
    		      node.local = this.parseIdent();
    		      this.checkLValSimple(node.local, BIND_LEXICAL);
    		      nodes.push(this.finishNode(node, "ImportDefaultSpecifier"));
    		      if (!this.eat(types$1.comma)) { return nodes }
    		    }
    		    if (this.type === types$1.star) {
    		      var node$1 = this.startNode();
    		      this.next();
    		      this.expectContextual("as");
    		      node$1.local = this.parseIdent();
    		      this.checkLValSimple(node$1.local, BIND_LEXICAL);
    		      nodes.push(this.finishNode(node$1, "ImportNamespaceSpecifier"));
    		      return nodes
    		    }
    		    this.expect(types$1.braceL);
    		    while (!this.eat(types$1.braceR)) {
    		      if (!first) {
    		        this.expect(types$1.comma);
    		        if (this.afterTrailingComma(types$1.braceR)) { break }
    		      } else { first = false; }

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

    		  pp$8.parseModuleExportName = function() {
    		    if (this.options.ecmaVersion >= 13 && this.type === types$1.string) {
    		      var stringLiteral = this.parseLiteral(this.value);
    		      if (loneSurrogate.test(stringLiteral.value)) {
    		        this.raise(stringLiteral.start, "An export name cannot include a lone surrogate.");
    		      }
    		      return stringLiteral
    		    }
    		    return this.parseIdent(true)
    		  };

    		  // Set `ExpressionStatement#directive` property for directive prologues.
    		  pp$8.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$8.isDirectiveCandidate = function(statement) {
    		    return (
    		      this.options.ecmaVersion >= 5 &&
    		      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$7 = Parser.prototype;

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

    		  pp$7.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 "AssignmentPattern":
    		      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);
    		        break

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

    		      case "ChainExpression":
    		        this.raiseRecoverable(node.start, "Optional chaining cannot appear in left-hand side");
    		        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$7.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$7.parseSpread = function(refDestructuringErrors) {
    		    var node = this.startNode();
    		    this.next();
    		    node.argument = this.parseMaybeAssign(false, refDestructuringErrors);
    		    return this.finishNode(node, "SpreadElement")
    		  };

    		  pp$7.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$1.name)
    		      { this.unexpected(); }

    		    node.argument = this.parseBindingAtom();

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

    		  // Parses lvalue (assignable) atom.

    		  pp$7.parseBindingAtom = function() {
    		    if (this.options.ecmaVersion >= 6) {
    		      switch (this.type) {
    		      case types$1.bracketL:
    		        var node = this.startNode();
    		        this.next();
    		        node.elements = this.parseBindingList(types$1.bracketR, true, true);
    		        return this.finishNode(node, "ArrayPattern")

    		      case types$1.braceL:
    		        return this.parseObj(true)
    		      }
    		    }
    		    return this.parseIdent()
    		  };

    		  pp$7.parseBindingList = function(close, allowEmpty, allowTrailingComma) {
    		    var elts = [], first = true;
    		    while (!this.eat(close)) {
    		      if (first) { first = false; }
    		      else { this.expect(types$1.comma); }
    		      if (allowEmpty && this.type === types$1.comma) {
    		        elts.push(null);
    		      } else if (allowTrailingComma && this.afterTrailingComma(close)) {
    		        break
    		      } else if (this.type === types$1.ellipsis) {
    		        var rest = this.parseRestBinding();
    		        this.parseBindingListItem(rest);
    		        elts.push(rest);
    		        if (this.type === types$1.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$7.parseBindingListItem = function(param) {
    		    return param
    		  };

    		  // Parses assignment pattern around given atom if possible.

    		  pp$7.parseMaybeDefault = function(startPos, startLoc, left) {
    		    left = left || this.parseBindingAtom();
    		    if (this.options.ecmaVersion < 6 || !this.eat(types$1.eq)) { return left }
    		    var node = this.startNodeAt(startPos, startLoc);
    		    node.left = left;
    		    node.right = this.parseMaybeAssign();
    		    return this.finishNode(node, "AssignmentPattern")
    		  };

    		  // The following three functions all verify that a node is an lvalue —
    		  // something that can be bound, or assigned to. In order to do so, they perform
    		  // a variety of checks:
    		  //
    		  // - Check that none of the bound/assigned-to identifiers are reserved words.
    		  // - Record name declarations for bindings in the appropriate scope.
    		  // - Check duplicate argument names, if checkClashes is set.
    		  //
    		  // If a complex binding pattern is encountered (e.g., object and array
    		  // destructuring), the entire pattern is recursively checked.
    		  //
    		  // There are three versions of checkLVal*() appropriate for different
    		  // circumstances:
    		  //
    		  // - checkLValSimple() shall be used if the syntactic construct supports
    		  //   nothing other than identifiers and member expressions. Parenthesized
    		  //   expressions are also correctly handled. This is generally appropriate for
    		  //   constructs for which the spec says
    		  //
    		  //   > It is a Syntax Error if AssignmentTargetType of [the production] is not
    		  //   > simple.
    		  //
    		  //   It is also appropriate for checking if an identifier is valid and not
    		  //   defined elsewhere, like import declarations or function/class identifiers.
    		  //
    		  //   Examples where this is used include:
    		  //     a += …;
    		  //     import a from '…';
    		  //   where a is the node to be checked.
    		  //
    		  // - checkLValPattern() shall be used if the syntactic construct supports
    		  //   anything checkLValSimple() supports, as well as object and array
    		  //   destructuring patterns. This is generally appropriate for constructs for
    		  //   which the spec says
    		  //
    		  //   > It is a Syntax Error if [the production] is neither an ObjectLiteral nor
    		  //   > an ArrayLiteral and AssignmentTargetType of [the production] is not
    		  //   > simple.
    		  //
    		  //   Examples where this is used include:
    		  //     (a = …);
    		  //     const a = …;
    		  //     try { … } catch (a) { … }
    		  //   where a is the node to be checked.
    		  //
    		  // - checkLValInnerPattern() shall be used if the syntactic construct supports
    		  //   anything checkLValPattern() supports, as well as default assignment
    		  //   patterns, rest elements, and other constructs that may appear within an
    		  //   object or array destructuring pattern.
    		  //
    		  //   As a special case, function parameters also use checkLValInnerPattern(),
    		  //   as they also support defaults and rest constructs.
    		  //
    		  // These functions deliberately support both assignment and binding constructs,
    		  // as the logic for both is exceedingly similar. If the node is the target of
    		  // an assignment, then bindingType should be set to BIND_NONE. Otherwise, it
    		  // should be set to the appropriate BIND_* constant, like BIND_VAR or
    		  // BIND_LEXICAL.
    		  //
    		  // If the function is called with a non-BIND_NONE bindingType, then
    		  // additionally a checkClashes object may be specified to allow checking for
    		  // duplicate argument names. checkClashes is ignored if the provided construct
    		  // is an assignment (i.e., bindingType is BIND_NONE).

    		  pp$7.checkLValSimple = function(expr, bindingType, checkClashes) {
    		    if ( bindingType === void 0 ) bindingType = BIND_NONE;

    		    var isBind = bindingType !== BIND_NONE;

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

    		    case "ChainExpression":
    		      this.raiseRecoverable(expr.start, "Optional chaining cannot appear in left-hand side");
    		      break

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

    		    case "ParenthesizedExpression":
    		      if (isBind) { this.raiseRecoverable(expr.start, "Binding parenthesized expression"); }
    		      return this.checkLValSimple(expr.expression, bindingType, checkClashes)

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

    		  pp$7.checkLValPattern = function(expr, bindingType, checkClashes) {
    		    if ( bindingType === void 0 ) bindingType = BIND_NONE;

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

    		      this.checkLValInnerPattern(prop, 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.checkLValInnerPattern(elem, bindingType, checkClashes); }
    		      }
    		      break

    		    default:
    		      this.checkLValSimple(expr, bindingType, checkClashes);
    		    }
    		  };

    		  pp$7.checkLValInnerPattern = function(expr, bindingType, checkClashes) {
    		    if ( bindingType === void 0 ) bindingType = BIND_NONE;

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

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

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

    		    default:
    		      this.checkLValPattern(expr, bindingType, checkClashes);
    		    }
    		  };

    		  // 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 = {
    		    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$6 = Parser.prototype;

    		  pp$6.initialContext = function() {
    		    return [types.b_stat]
    		  };

    		  pp$6.curContext = function() {
    		    return this.context[this.context.length - 1]
    		  };

    		  pp$6.braceIsBlock = function(prevType) {
    		    var parent = this.curContext();
    		    if (parent === types.f_expr || parent === types.f_stat)
    		      { return true }
    		    if (prevType === types$1.colon && (parent === types.b_stat || parent === types.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$1._return || prevType === types$1.name && this.exprAllowed)
    		      { return lineBreak.test(this.input.slice(this.lastTokEnd, this.start)) }
    		    if (prevType === types$1._else || prevType === types$1.semi || prevType === types$1.eof || prevType === types$1.parenR || prevType === types$1.arrow)
    		      { return true }
    		    if (prevType === types$1.braceL)
    		      { return parent === types.b_stat }
    		    if (prevType === types$1._var || prevType === types$1._const || prevType === types$1.name)
    		      { return false }
    		    return !this.exprAllowed
    		  };

    		  pp$6.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$6.updateContext = function(prevType) {
    		    var update, type = this.type;
    		    if (type.keyword && prevType === types$1.dot)
    		      { this.exprAllowed = false; }
    		    else if (update = type.updateContext)
    		      { update.call(this, prevType); }
    		    else
    		      { this.exprAllowed = type.beforeExpr; }
    		  };

    		  // Used to handle egde cases when token context could not be inferred correctly during tokenization phase

    		  pp$6.overrideContext = function(tokenCtx) {
    		    if (this.curContext() !== tokenCtx) {
    		      this.context[this.context.length - 1] = tokenCtx;
    		    }
    		  };

    		  // Token-specific context update code

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

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

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

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

    		  types$1.incDec.updateContext = function() {
    		    // tokExprAllowed stays unchanged
    		  };

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

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

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

    		  types$1.name.updateContext = function(prevType) {
    		    var allowed = false;
    		    if (this.options.ecmaVersion >= 6 && prevType !== types$1.dot) {
    		      if (this.value === "of" && !this.exprAllowed ||
    		          this.value === "yield" && this.inGeneratorContext())
    		        { allowed = true; }
    		    }
    		    this.exprAllowed = allowed;
    		  };

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

    		  var pp$5 = 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$5.checkPropClash = function(prop, propHash, refDestructuringErrors) {
    		    if (this.options.ecmaVersion >= 9 && prop.type === "SpreadElement")
    		      { return }
    		    if (this.options.ecmaVersion >= 6 && (prop.computed || prop.method || prop.shorthand))
    		      { return }
    		    var key = prop.key;
    		    var name;
    		    switch (key.type) {
    		    case "Identifier": name = key.name; break
    		    case "Literal": name = String(key.value); break
    		    default: return
    		    }
    		    var kind = prop.kind;
    		    if (this.options.ecmaVersion >= 6) {
    		      if (name === "__proto__" && kind === "init") {
    		        if (propHash.proto) {
    		          if (refDestructuringErrors) {
    		            if (refDestructuringErrors.doubleProto < 0) {
    		              refDestructuringErrors.doubleProto = key.start;
    		            }
    		          } else {
    		            this.raiseRecoverable(key.start, "Redefinition of __proto__ property");
    		          }
    		        }
    		        propHash.proto = true;
    		      }
    		      return
    		    }
    		    name = "$" + 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$5.parseExpression = function(forInit, refDestructuringErrors) {
    		    var startPos = this.start, startLoc = this.startLoc;
    		    var expr = this.parseMaybeAssign(forInit, refDestructuringErrors);
    		    if (this.type === types$1.comma) {
    		      var node = this.startNodeAt(startPos, startLoc);
    		      node.expressions = [expr];
    		      while (this.eat(types$1.comma)) { node.expressions.push(this.parseMaybeAssign(forInit, refDestructuringErrors)); }
    		      return this.finishNode(node, "SequenceExpression")
    		    }
    		    return expr
    		  };

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

    		  pp$5.parseMaybeAssign = function(forInit, refDestructuringErrors, afterLeftParse) {
    		    if (this.isContextual("yield")) {
    		      if (this.inGenerator) { return this.parseYield(forInit) }
    		      // 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, oldDoubleProto = -1;
    		    if (refDestructuringErrors) {
    		      oldParenAssign = refDestructuringErrors.parenthesizedAssign;
    		      oldTrailingComma = refDestructuringErrors.trailingComma;
    		      oldDoubleProto = refDestructuringErrors.doubleProto;
    		      refDestructuringErrors.parenthesizedAssign = refDestructuringErrors.trailingComma = -1;
    		    } else {
    		      refDestructuringErrors = new DestructuringErrors;
    		      ownDestructuringErrors = true;
    		    }

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

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

    		  pp$5.parseMaybeConditional = function(forInit, refDestructuringErrors) {
    		    var startPos = this.start, startLoc = this.startLoc;
    		    var expr = this.parseExprOps(forInit, refDestructuringErrors);
    		    if (this.checkExpressionErrors(refDestructuringErrors)) { return expr }
    		    if (this.eat(types$1.question)) {
    		      var node = this.startNodeAt(startPos, startLoc);
    		      node.test = expr;
    		      node.consequent = this.parseMaybeAssign();
    		      this.expect(types$1.colon);
    		      node.alternate = this.parseMaybeAssign(forInit);
    		      return this.finishNode(node, "ConditionalExpression")
    		    }
    		    return expr
    		  };

    		  // Start the precedence parser.

    		  pp$5.parseExprOps = function(forInit, refDestructuringErrors) {
    		    var startPos = this.start, startLoc = this.startLoc;
    		    var expr = this.parseMaybeUnary(refDestructuringErrors, false, false, forInit);
    		    if (this.checkExpressionErrors(refDestructuringErrors)) { return expr }
    		    return expr.start === startPos && expr.type === "ArrowFunctionExpression" ? expr : this.parseExprOp(expr, startPos, startLoc, -1, forInit)
    		  };

    		  // 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$5.parseExprOp = function(left, leftStartPos, leftStartLoc, minPrec, forInit) {
    		    var prec = this.type.binop;
    		    if (prec != null && (!forInit || this.type !== types$1._in)) {
    		      if (prec > minPrec) {
    		        var logical = this.type === types$1.logicalOR || this.type === types$1.logicalAND;
    		        var coalesce = this.type === types$1.coalesce;
    		        if (coalesce) {
    		          // Handle the precedence of `tt.coalesce` as equal to the range of logical expressions.
    		          // In other words, `node.right` shouldn't contain logical expressions in order to check the mixed error.
    		          prec = types$1.logicalAND.binop;
    		        }
    		        var op = this.value;
    		        this.next();
    		        var startPos = this.start, startLoc = this.startLoc;
    		        var right = this.parseExprOp(this.parseMaybeUnary(null, false, false, forInit), startPos, startLoc, prec, forInit);
    		        var node = this.buildBinary(leftStartPos, leftStartLoc, left, right, op, logical || coalesce);
    		        if ((logical && this.type === types$1.coalesce) || (coalesce && (this.type === types$1.logicalOR || this.type === types$1.logicalAND))) {
    		          this.raiseRecoverable(this.start, "Logical expressions and coalesce expressions cannot be mixed. Wrap either by parentheses");
    		        }
    		        return this.parseExprOp(node, leftStartPos, leftStartLoc, minPrec, forInit)
    		      }
    		    }
    		    return left
    		  };

    		  pp$5.buildBinary = function(startPos, startLoc, left, right, op, logical) {
    		    if (right.type === "PrivateIdentifier") { this.raise(right.start, "Private identifier can only be left side of binary expression"); }
    		    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$5.parseMaybeUnary = function(refDestructuringErrors, sawUnary, incDec, forInit) {
    		    var startPos = this.start, startLoc = this.startLoc, expr;
    		    if (this.isContextual("await") && this.canAwait) {
    		      expr = this.parseAwait(forInit);
    		      sawUnary = true;
    		    } else if (this.type.prefix) {
    		      var node = this.startNode(), update = this.type === types$1.incDec;
    		      node.operator = this.value;
    		      node.prefix = true;
    		      this.next();
    		      node.argument = this.parseMaybeUnary(null, true, update, forInit);
    		      this.checkExpressionErrors(refDestructuringErrors, true);
    		      if (update) { this.checkLValSimple(node.argument); }
    		      else if (this.strict && node.operator === "delete" &&
    		               node.argument.type === "Identifier")
    		        { this.raiseRecoverable(node.start, "Deleting local variable in strict mode"); }
    		      else if (node.operator === "delete" && isPrivateFieldAccess(node.argument))
    		        { this.raiseRecoverable(node.start, "Private fields can not be deleted"); }
    		      else { sawUnary = true; }
    		      expr = this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression");
    		    } else if (!sawUnary && this.type === types$1.privateId) {
    		      if (forInit || this.privateNameStack.length === 0) { this.unexpected(); }
    		      expr = this.parsePrivateIdent();
    		      // only could be private fields in 'in', such as #x in obj
    		      if (this.type !== types$1._in) { this.unexpected(); }
    		    } else {
    		      expr = this.parseExprSubscripts(refDestructuringErrors, forInit);
    		      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.checkLValSimple(expr);
    		        this.next();
    		        expr = this.finishNode(node$1, "UpdateExpression");
    		      }
    		    }

    		    if (!incDec && this.eat(types$1.starstar)) {
    		      if (sawUnary)
    		        { this.unexpected(this.lastTokStart); }
    		      else
    		        { return this.buildBinary(startPos, startLoc, expr, this.parseMaybeUnary(null, false, false, forInit), "**", false) }
    		    } else {
    		      return expr
    		    }
    		  };

    		  function isPrivateFieldAccess(node) {
    		    return (
    		      node.type === "MemberExpression" && node.property.type === "PrivateIdentifier" ||
    		      node.type === "ChainExpression" && isPrivateFieldAccess(node.expression)
    		    )
    		  }

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

    		  pp$5.parseExprSubscripts = function(refDestructuringErrors, forInit) {
    		    var startPos = this.start, startLoc = this.startLoc;
    		    var expr = this.parseExprAtom(refDestructuringErrors, forInit);
    		    if (expr.type === "ArrowFunctionExpression" && this.input.slice(this.lastTokStart, this.lastTokEnd) !== ")")
    		      { return expr }
    		    var result = this.parseSubscripts(expr, startPos, startLoc, false, forInit);
    		    if (refDestructuringErrors && result.type === "MemberExpression") {
    		      if (refDestructuringErrors.parenthesizedAssign >= result.start) { refDestructuringErrors.parenthesizedAssign = -1; }
    		      if (refDestructuringErrors.parenthesizedBind >= result.start) { refDestructuringErrors.parenthesizedBind = -1; }
    		      if (refDestructuringErrors.trailingComma >= result.start) { refDestructuringErrors.trailingComma = -1; }
    		    }
    		    return result
    		  };

    		  pp$5.parseSubscripts = function(base, startPos, startLoc, noCalls, forInit) {
    		    var maybeAsyncArrow = this.options.ecmaVersion >= 8 && base.type === "Identifier" && base.name === "async" &&
    		        this.lastTokEnd === base.end && !this.canInsertSemicolon() && base.end - base.start === 5 &&
    		        this.potentialArrowAt === base.start;
    		    var optionalChained = false;

    		    while (true) {
    		      var element = this.parseSubscript(base, startPos, startLoc, noCalls, maybeAsyncArrow, optionalChained, forInit);

    		      if (element.optional) { optionalChained = true; }
    		      if (element === base || element.type === "ArrowFunctionExpression") {
    		        if (optionalChained) {
    		          var chainNode = this.startNodeAt(startPos, startLoc);
    		          chainNode.expression = element;
    		          element = this.finishNode(chainNode, "ChainExpression");
    		        }
    		        return element
    		      }

    		      base = element;
    		    }
    		  };

    		  pp$5.parseSubscript = function(base, startPos, startLoc, noCalls, maybeAsyncArrow, optionalChained, forInit) {
    		    var optionalSupported = this.options.ecmaVersion >= 11;
    		    var optional = optionalSupported && this.eat(types$1.questionDot);
    		    if (noCalls && optional) { this.raise(this.lastTokStart, "Optional chaining cannot appear in the callee of new expressions"); }

    		    var computed = this.eat(types$1.bracketL);
    		    if (computed || (optional && this.type !== types$1.parenL && this.type !== types$1.backQuote) || this.eat(types$1.dot)) {
    		      var node = this.startNodeAt(startPos, startLoc);
    		      node.object = base;
    		      if (computed) {
    		        node.property = this.parseExpression();
    		        this.expect(types$1.bracketR);
    		      } else if (this.type === types$1.privateId && base.type !== "Super") {
    		        node.property = this.parsePrivateIdent();
    		      } else {
    		        node.property = this.parseIdent(this.options.allowReserved !== "never");
    		      }
    		      node.computed = !!computed;
    		      if (optionalSupported) {
    		        node.optional = optional;
    		      }
    		      base = this.finishNode(node, "MemberExpression");
    		    } else if (!noCalls && this.eat(types$1.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$1.parenR, this.options.ecmaVersion >= 8, false, refDestructuringErrors);
    		      if (maybeAsyncArrow && !optional && !this.canInsertSemicolon() && this.eat(types$1.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, forInit)
    		      }
    		      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 (optionalSupported) {
    		        node$1.optional = optional;
    		      }
    		      base = this.finishNode(node$1, "CallExpression");
    		    } else if (this.type === types$1.backQuote) {
    		      if (optional || optionalChained) {
    		        this.raise(this.start, "Optional chaining cannot appear in the tag of tagged template expressions");
    		      }
    		      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$5.parseExprAtom = function(refDestructuringErrors, forInit) {
    		    // 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$1.slash) { this.readRegexp(); }

    		    var node, canBeArrow = this.potentialArrowAt === this.start;
    		    switch (this.type) {
    		    case types$1._super:
    		      if (!this.allowSuper)
    		        { this.raise(this.start, "'super' keyword outside a method"); }
    		      node = this.startNode();
    		      this.next();
    		      if (this.type === types$1.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$1.dot && this.type !== types$1.bracketL && this.type !== types$1.parenL)
    		        { this.unexpected(); }
    		      return this.finishNode(node, "Super")

    		    case types$1._this:
    		      node = this.startNode();
    		      this.next();
    		      return this.finishNode(node, "ThisExpression")

    		    case types$1.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$1._function)) {
    		        this.overrideContext(types.f_expr);
    		        return this.parseFunction(this.startNodeAt(startPos, startLoc), 0, false, true, forInit)
    		      }
    		      if (canBeArrow && !this.canInsertSemicolon()) {
    		        if (this.eat(types$1.arrow))
    		          { return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), [id], false, forInit) }
    		        if (this.options.ecmaVersion >= 8 && id.name === "async" && this.type === types$1.name && !containsEsc &&
    		            (!this.potentialArrowInForAwait || this.value !== "of" || this.containsEsc)) {
    		          id = this.parseIdent(false);
    		          if (this.canInsertSemicolon() || !this.eat(types$1.arrow))
    		            { this.unexpected(); }
    		          return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), [id], true, forInit)
    		        }
    		      }
    		      return id

    		    case types$1.regexp:
    		      var value = this.value;
    		      node = this.parseLiteral(value.value);
    		      node.regex = {pattern: value.pattern, flags: value.flags};
    		      return node

    		    case types$1.num: case types$1.string:
    		      return this.parseLiteral(this.value)

    		    case types$1._null: case types$1._true: case types$1._false:
    		      node = this.startNode();
    		      node.value = this.type === types$1._null ? null : this.type === types$1._true;
    		      node.raw = this.type.keyword;
    		      this.next();
    		      return this.finishNode(node, "Literal")

    		    case types$1.parenL:
    		      var start = this.start, expr = this.parseParenAndDistinguishExpression(canBeArrow, forInit);
    		      if (refDestructuringErrors) {
    		        if (refDestructuringErrors.parenthesizedAssign < 0 && !this.isSimpleAssignTarget(expr))
    		          { refDestructuringErrors.parenthesizedAssign = start; }
    		        if (refDestructuringErrors.parenthesizedBind < 0)
    		          { refDestructuringErrors.parenthesizedBind = start; }
    		      }
    		      return expr

    		    case types$1.bracketL:
    		      node = this.startNode();
    		      this.next();
    		      node.elements = this.parseExprList(types$1.bracketR, true, true, refDestructuringErrors);
    		      return this.finishNode(node, "ArrayExpression")

    		    case types$1.braceL:
    		      this.overrideContext(types.b_expr);
    		      return this.parseObj(false, refDestructuringErrors)

    		    case types$1._function:
    		      node = this.startNode();
    		      this.next();
    		      return this.parseFunction(node, 0)

    		    case types$1._class:
    		      return this.parseClass(this.startNode(), false)

    		    case types$1._new:
    		      return this.parseNew()

    		    case types$1.backQuote:
    		      return this.parseTemplate()

    		    case types$1._import:
    		      if (this.options.ecmaVersion >= 11) {
    		        return this.parseExprImport()
    		      } else {
    		        return this.unexpected()
    		      }

    		    default:
    		      this.unexpected();
    		    }
    		  };

    		  pp$5.parseExprImport = function() {
    		    var node = this.startNode();

    		    // Consume `import` as an identifier for `import.meta`.
    		    // Because `this.parseIdent(true)` doesn't check escape sequences, it needs the check of `this.containsEsc`.
    		    if (this.containsEsc) { this.raiseRecoverable(this.start, "Escape sequence in keyword import"); }
    		    var meta = this.parseIdent(true);

    		    switch (this.type) {
    		    case types$1.parenL:
    		      return this.parseDynamicImport(node)
    		    case types$1.dot:
    		      node.meta = meta;
    		      return this.parseImportMeta(node)
    		    default:
    		      this.unexpected();
    		    }
    		  };

    		  pp$5.parseDynamicImport = function(node) {
    		    this.next(); // skip `(`

    		    // Parse node.source.
    		    node.source = this.parseMaybeAssign();

    		    // Verify ending.
    		    if (!this.eat(types$1.parenR)) {
    		      var errorPos = this.start;
    		      if (this.eat(types$1.comma) && this.eat(types$1.parenR)) {
    		        this.raiseRecoverable(errorPos, "Trailing comma is not allowed in import()");
    		      } else {
    		        this.unexpected(errorPos);
    		      }
    		    }

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

    		  pp$5.parseImportMeta = function(node) {
    		    this.next(); // skip `.`

    		    var containsEsc = this.containsEsc;
    		    node.property = this.parseIdent(true);

    		    if (node.property.name !== "meta")
    		      { this.raiseRecoverable(node.property.start, "The only valid meta property for import is 'import.meta'"); }
    		    if (containsEsc)
    		      { this.raiseRecoverable(node.start, "'import.meta' must not contain escaped characters"); }
    		    if (this.options.sourceType !== "module" && !this.options.allowImportExportEverywhere)
    		      { this.raiseRecoverable(node.start, "Cannot use 'import.meta' outside a module"); }

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

    		  pp$5.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).replace(/_/g, ""); }
    		    this.next();
    		    return this.finishNode(node, "Literal")
    		  };

    		  pp$5.parseParenExpression = function() {
    		    this.expect(types$1.parenL);
    		    var val = this.parseExpression();
    		    this.expect(types$1.parenR);
    		    return val
    		  };

    		  pp$5.parseParenAndDistinguishExpression = function(canBeArrow, forInit) {
    		    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$1.parenR) {
    		        first ? first = false : this.expect(types$1.comma);
    		        if (allowTrailingComma && this.afterTrailingComma(types$1.parenR, true)) {
    		          lastIsComma = true;
    		          break
    		        } else if (this.type === types$1.ellipsis) {
    		          spreadStart = this.start;
    		          exprList.push(this.parseParenItem(this.parseRestBinding()));
    		          if (this.type === types$1.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.lastTokEnd, innerEndLoc = this.lastTokEndLoc;
    		      this.expect(types$1.parenR);

    		      if (canBeArrow && !this.canInsertSemicolon() && this.eat(types$1.arrow)) {
    		        this.checkPatternErrors(refDestructuringErrors, false);
    		        this.checkYieldAwaitInDefaultParams();
    		        this.yieldPos = oldYieldPos;
    		        this.awaitPos = oldAwaitPos;
    		        return this.parseParenArrowList(startPos, startLoc, exprList, forInit)
    		      }

    		      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$5.parseParenItem = function(item) {
    		    return item
    		  };

    		  pp$5.parseParenArrowList = function(startPos, startLoc, exprList, forInit) {
    		    return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), exprList, false, forInit)
    		  };

    		  // 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 = [];

    		  pp$5.parseNew = function() {
    		    if (this.containsEsc) { this.raiseRecoverable(this.start, "Escape sequence in keyword new"); }
    		    var node = this.startNode();
    		    var meta = this.parseIdent(true);
    		    if (this.options.ecmaVersion >= 6 && this.eat(types$1.dot)) {
    		      node.meta = meta;
    		      var containsEsc = this.containsEsc;
    		      node.property = this.parseIdent(true);
    		      if (node.property.name !== "target")
    		        { this.raiseRecoverable(node.property.start, "The only valid meta property for new is 'new.target'"); }
    		      if (containsEsc)
    		        { this.raiseRecoverable(node.start, "'new.target' must not contain escaped characters"); }
    		      if (!this.allowNewDotTarget)
    		        { this.raiseRecoverable(node.start, "'new.target' can only be used in functions and class static block"); }
    		      return this.finishNode(node, "MetaProperty")
    		    }
    		    var startPos = this.start, startLoc = this.startLoc, isImport = this.type === types$1._import;
    		    node.callee = this.parseSubscripts(this.parseExprAtom(), startPos, startLoc, true, false);
    		    if (isImport && node.callee.type === "ImportExpression") {
    		      this.raise(startPos, "Cannot use new with import()");
    		    }
    		    if (this.eat(types$1.parenL)) { node.arguments = this.parseExprList(types$1.parenR, this.options.ecmaVersion >= 8, false); }
    		    else { node.arguments = empty; }
    		    return this.finishNode(node, "NewExpression")
    		  };

    		  // Parse template expression.

    		  pp$5.parseTemplateElement = function(ref) {
    		    var isTagged = ref.isTagged;

    		    var elem = this.startNode();
    		    if (this.type === types$1.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$1.backQuote;
    		    return this.finishNode(elem, "TemplateElement")
    		  };

    		  pp$5.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$1.eof) { this.raise(this.pos, "Unterminated template literal"); }
    		      this.expect(types$1.dollarBraceL);
    		      node.expressions.push(this.parseExpression());
    		      this.expect(types$1.braceR);
    		      node.quasis.push(curElt = this.parseTemplateElement({isTagged: isTagged}));
    		    }
    		    this.next();
    		    return this.finishNode(node, "TemplateLiteral")
    		  };

    		  pp$5.isAsyncProp = function(prop) {
    		    return !prop.computed && prop.key.type === "Identifier" && prop.key.name === "async" &&
    		      (this.type === types$1.name || this.type === types$1.num || this.type === types$1.string || this.type === types$1.bracketL || this.type.keyword || (this.options.ecmaVersion >= 9 && this.type === types$1.star)) &&
    		      !lineBreak.test(this.input.slice(this.lastTokEnd, this.start))
    		  };

    		  // Parse an object literal or binding pattern.

    		  pp$5.parseObj = function(isPattern, refDestructuringErrors) {
    		    var node = this.startNode(), first = true, propHash = {};
    		    node.properties = [];
    		    this.next();
    		    while (!this.eat(types$1.braceR)) {
    		      if (!first) {
    		        this.expect(types$1.comma);
    		        if (this.options.ecmaVersion >= 5 && this.afterTrailingComma(types$1.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$5.parseProperty = function(isPattern, refDestructuringErrors) {
    		    var prop = this.startNode(), isGenerator, isAsync, startPos, startLoc;
    		    if (this.options.ecmaVersion >= 9 && this.eat(types$1.ellipsis)) {
    		      if (isPattern) {
    		        prop.argument = this.parseIdent(false);
    		        if (this.type === types$1.comma) {
    		          this.raise(this.start, "Comma is not permitted after the rest element");
    		        }
    		        return this.finishNode(prop, "RestElement")
    		      }
    		      // Parse argument.
    		      prop.argument = this.parseMaybeAssign(false, refDestructuringErrors);
    		      // To disallow trailing comma via `this.toAssignable()`.
    		      if (this.type === types$1.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$1.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$1.star);
    		      this.parsePropertyName(prop);
    		    } else {
    		      isAsync = false;
    		    }
    		    this.parsePropertyValue(prop, isPattern, isGenerator, isAsync, startPos, startLoc, refDestructuringErrors, containsEsc);
    		    return this.finishNode(prop, "Property")
    		  };

    		  pp$5.parsePropertyValue = function(prop, isPattern, isGenerator, isAsync, startPos, startLoc, refDestructuringErrors, containsEsc) {
    		    if ((isGenerator || isAsync) && this.type === types$1.colon)
    		      { this.unexpected(); }

    		    if (this.eat(types$1.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$1.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$1.comma && this.type !== types$1.braceR && this.type !== types$1.eq)) {
    		      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, this.copyNode(prop.key));
    		      } else if (this.type === types$1.eq && refDestructuringErrors) {
    		        if (refDestructuringErrors.shorthandAssign < 0)
    		          { refDestructuringErrors.shorthandAssign = this.start; }
    		        prop.value = this.parseMaybeDefault(startPos, startLoc, this.copyNode(prop.key));
    		      } else {
    		        prop.value = this.copyNode(prop.key);
    		      }
    		      prop.shorthand = true;
    		    } else { this.unexpected(); }
    		  };

    		  pp$5.parsePropertyName = function(prop) {
    		    if (this.options.ecmaVersion >= 6) {
    		      if (this.eat(types$1.bracketL)) {
    		        prop.computed = true;
    		        prop.key = this.parseMaybeAssign();
    		        this.expect(types$1.bracketR);
    		        return prop.key
    		      } else {
    		        prop.computed = false;
    		      }
    		    }
    		    return prop.key = this.type === types$1.num || this.type === types$1.string ? this.parseExprAtom() : this.parseIdent(this.options.allowReserved !== "never")
    		  };

    		  // Initialize empty function node.

    		  pp$5.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$5.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$1.parenL);
    		    node.params = this.parseBindingList(types$1.parenR, false, this.options.ecmaVersion >= 8);
    		    this.checkYieldAwaitInDefaultParams();
    		    this.parseFunctionBody(node, false, true, false);

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

    		  // Parse arrow function expression with given parameters.

    		  pp$5.parseArrowExpression = function(node, params, isAsync, forInit) {
    		    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, forInit);

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

    		  // Parse function body and check parameters.

    		  pp$5.parseFunctionBody = function(node, isArrowFunction, isMethod, forInit) {
    		    var isExpression = isArrowFunction && this.type !== types$1.braceL;
    		    var oldStrict = this.strict, useStrict = false;

    		    if (isExpression) {
    		      node.body = this.parseMaybeAssign(forInit);
    		      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));
    		      // Ensure the function name isn't a forbidden identifier in strict mode, e.g. 'eval'
    		      if (this.strict && node.id) { this.checkLValSimple(node.id, BIND_OUTSIDE); }
    		      node.body = this.parseBlock(false, undefined, useStrict && !oldStrict);
    		      node.expression = false;
    		      this.adaptDirectivePrologue(node.body.body);
    		      this.labels = oldLabels;
    		    }
    		    this.exitScope();
    		  };

    		  pp$5.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$5.checkParams = function(node, allowDuplicates) {
    		    var nameHash = Object.create(null);
    		    for (var i = 0, list = node.params; i < list.length; i += 1)
    		      {
    		      var param = list[i];

    		      this.checkLValInnerPattern(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$5.parseExprList = function(close, allowTrailingComma, allowEmpty, refDestructuringErrors) {
    		    var elts = [], first = true;
    		    while (!this.eat(close)) {
    		      if (!first) {
    		        this.expect(types$1.comma);
    		        if (allowTrailingComma && this.afterTrailingComma(close)) { break }
    		      } else { first = false; }

    		      var elt = (void 0);
    		      if (allowEmpty && this.type === types$1.comma)
    		        { elt = null; }
    		      else if (this.type === types$1.ellipsis) {
    		        elt = this.parseSpread(refDestructuringErrors);
    		        if (refDestructuringErrors && this.type === types$1.comma && refDestructuringErrors.trailingComma < 0)
    		          { refDestructuringErrors.trailingComma = this.start; }
    		      } else {
    		        elt = this.parseMaybeAssign(false, refDestructuringErrors);
    		      }
    		      elts.push(elt);
    		    }
    		    return elts
    		  };

    		  pp$5.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.currentThisScope().inClassFieldInit && name === "arguments")
    		      { this.raiseRecoverable(start, "Cannot use 'arguments' in class field initializer"); }
    		    if (this.inClassStaticBlock && (name === "arguments" || name === "await"))
    		      { this.raise(start, ("Cannot use " + name + " in class static initialization block")); }
    		    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$5.parseIdent = function(liberal) {
    		    var node = this.startNode();
    		    if (this.type === types$1.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(!!liberal);
    		    this.finishNode(node, "Identifier");
    		    if (!liberal) {
    		      this.checkUnreserved(node);
    		      if (node.name === "await" && !this.awaitIdentPos)
    		        { this.awaitIdentPos = node.start; }
    		    }
    		    return node
    		  };

    		  pp$5.parsePrivateIdent = function() {
    		    var node = this.startNode();
    		    if (this.type === types$1.privateId) {
    		      node.name = this.value;
    		    } else {
    		      this.unexpected();
    		    }
    		    this.next();
    		    this.finishNode(node, "PrivateIdentifier");

    		    // For validating existence
    		    if (this.privateNameStack.length === 0) {
    		      this.raise(node.start, ("Private field '#" + (node.name) + "' must be declared in an enclosing class"));
    		    } else {
    		      this.privateNameStack[this.privateNameStack.length - 1].used.push(node);
    		    }

    		    return node
    		  };

    		  // Parses yield expression inside generator.

    		  pp$5.parseYield = function(forInit) {
    		    if (!this.yieldPos) { this.yieldPos = this.start; }

    		    var node = this.startNode();
    		    this.next();
    		    if (this.type === types$1.semi || this.canInsertSemicolon() || (this.type !== types$1.star && !this.type.startsExpr)) {
    		      node.delegate = false;
    		      node.argument = null;
    		    } else {
    		      node.delegate = this.eat(types$1.star);
    		      node.argument = this.parseMaybeAssign(forInit);
    		    }
    		    return this.finishNode(node, "YieldExpression")
    		  };

    		  pp$5.parseAwait = function(forInit) {
    		    if (!this.awaitPos) { this.awaitPos = this.start; }

    		    var node = this.startNode();
    		    this.next();
    		    node.argument = this.parseMaybeUnary(null, true, false, forInit);
    		    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$3 = 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 = [];
    		    // A switch to disallow the identifier reference 'arguments'
    		    this.inClassFieldInit = false;
    		  };

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

    		  pp$3.enterScope = function(flags) {
    		    this.scopeStack.push(new Scope(flags));
    		  };

    		  pp$3.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$3.treatFunctionsAsVarInScope = function(scope) {
    		    return (scope.flags & SCOPE_FUNCTION) || !this.inModule && (scope.flags & SCOPE_TOP)
    		  };

    		  pp$3.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$3.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$3.currentScope = function() {
    		    return this.scopeStack[this.scopeStack.length - 1]
    		  };

    		  pp$3.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$3.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$2 = Parser.prototype;

    		  pp$2.startNode = function() {
    		    return new Node(this, this.start, this.startLoc)
    		  };

    		  pp$2.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$2.finishNode = function(node, type) {
    		    return finishNodeAt.call(this, node, type, this.lastTokEnd, this.lastTokEndLoc)
    		  };

    		  // Finish node at given position

    		  pp$2.finishNodeAt = function(node, type, pos, loc) {
    		    return finishNodeAt.call(this, node, type, pos, loc)
    		  };

    		  pp$2.copyNode = function(node) {
    		    var newNode = new Node(this, node.start, this.startLoc);
    		    for (var prop in node) { newNode[prop] = node[prop]; }
    		    return newNode
    		  };

    		  // 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 ecma12BinaryProperties = ecma11BinaryProperties + " EBase EComp EMod EPres ExtPict";
    		  var ecma13BinaryProperties = ecma12BinaryProperties;
    		  var ecma14BinaryProperties = ecma13BinaryProperties;

    		  var unicodeBinaryProperties = {
    		    9: ecma9BinaryProperties,
    		    10: ecma10BinaryProperties,
    		    11: ecma11BinaryProperties,
    		    12: ecma12BinaryProperties,
    		    13: ecma13BinaryProperties,
    		    14: ecma14BinaryProperties
    		  };

    		  // #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 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 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 ecma12ScriptValues = ecma11ScriptValues + " Chorasmian Chrs Diak Dives_Akuru Khitan_Small_Script Kits Yezi Yezidi";
    		  var ecma13ScriptValues = ecma12ScriptValues + " Cypro_Minoan Cpmn Old_Uyghur Ougr Tangsa Tnsa Toto Vithkuqi Vith";
    		  var ecma14ScriptValues = ecma13ScriptValues + " Kawi Nag_Mundari Nagm";

    		  var unicodeScriptValues = {
    		    9: ecma9ScriptValues,
    		    10: ecma10ScriptValues,
    		    11: ecma11ScriptValues,
    		    12: ecma12ScriptValues,
    		    13: ecma13ScriptValues,
    		    14: ecma14ScriptValues
    		  };

    		  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;
    		  }

    		  for (var i = 0, list = [9, 10, 11, 12, 13, 14]; i < list.length; i += 1) {
    		    var ecmaVersion = list[i];

    		    buildUnicodeData(ecmaVersion);
    		  }

    		  var pp$1 = Parser.prototype;

    		  var RegExpValidationState = function RegExpValidationState(parser) {
    		    this.parser = parser;
    		    this.validFlags = "gim" + (parser.options.ecmaVersion >= 6 ? "uy" : "") + (parser.options.ecmaVersion >= 9 ? "s" : "") + (parser.options.ecmaVersion >= 13 ? "d" : "");
    		    this.unicodeProperties = data[parser.options.ecmaVersion >= 14 ? 14 : 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, forceU) {
    		      if ( forceU === void 0 ) forceU = false;

    		    var s = this.source;
    		    var l = s.length;
    		    if (i >= l) {
    		      return -1
    		    }
    		    var c = s.charCodeAt(i);
    		    if (!(forceU || 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, forceU) {
    		      if ( forceU === void 0 ) forceU = false;

    		    var s = this.source;
    		    var l = s.length;
    		    if (i >= l) {
    		      return l
    		    }
    		    var c = s.charCodeAt(i), next;
    		    if (!(forceU || 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 (forceU) {
    		      if ( forceU === void 0 ) forceU = false;

    		    return this.at(this.pos, forceU)
    		  };

    		  RegExpValidationState.prototype.lookahead = function lookahead (forceU) {
    		      if ( forceU === void 0 ) forceU = false;

    		    return this.at(this.nextIndex(this.pos, forceU), forceU)
    		  };

    		  RegExpValidationState.prototype.advance = function advance (forceU) {
    		      if ( forceU === void 0 ) forceU = false;

    		    this.pos = this.nextIndex(this.pos, forceU);
    		  };

    		  RegExpValidationState.prototype.eat = function eat (ch, forceU) {
    		      if ( forceU === void 0 ) forceU = false;

    		    if (this.current(forceU) === ch) {
    		      this.advance(forceU);
    		      return true
    		    }
    		    return false
    		  };

    		  /**
    		   * Validate the flags part of a given RegExpLiteral.
    		   *
    		   * @param {RegExpValidationState} state The state to validate RegExp.
    		   * @returns {void}
    		   */
    		  pp$1.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$1.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$1.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$1.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$1.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$1.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$1.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$1.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$1.regexp_eatQuantifierPrefix = function(state, noError) {
    		    return (
    		      state.eat(0x2A /* * */) ||
    		      state.eat(0x2B /* + */) ||
    		      state.eat(0x3F /* ? */) ||
    		      this.regexp_eatBracedQuantifier(state, noError)
    		    )
    		  };
    		  pp$1.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$1.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$1.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$1.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$1.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$1.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$1.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$1.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$1.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$1.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 ::
    		  //   [empty]
    		  //   `?` GroupName
    		  pp$1.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 ::
    		  //   `<` RegExpIdentifierName `>`
    		  // Note: this updates `state.lastStringValue` property with the eaten name.
    		  pp$1.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 ::
    		  //   RegExpIdentifierStart
    		  //   RegExpIdentifierName RegExpIdentifierPart
    		  // Note: this updates `state.lastStringValue` property with the eaten name.
    		  pp$1.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 ::
    		  //   UnicodeIDStart
    		  //   `$`
    		  //   `_`
    		  //   `\` RegExpUnicodeEscapeSequence[+U]
    		  pp$1.regexp_eatRegExpIdentifierStart = function(state) {
    		    var start = state.pos;
    		    var forceU = this.options.ecmaVersion >= 11;
    		    var ch = state.current(forceU);
    		    state.advance(forceU);

    		    if (ch === 0x5C /* \ */ && this.regexp_eatRegExpUnicodeEscapeSequence(state, forceU)) {
    		      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 ::
    		  //   UnicodeIDContinue
    		  //   `$`
    		  //   `_`
    		  //   `\` RegExpUnicodeEscapeSequence[+U]
    		  //   <ZWNJ>
    		  //   <ZWJ>
    		  pp$1.regexp_eatRegExpIdentifierPart = function(state) {
    		    var start = state.pos;
    		    var forceU = this.options.ecmaVersion >= 11;
    		    var ch = state.current(forceU);
    		    state.advance(forceU);

    		    if (ch === 0x5C /* \ */ && this.regexp_eatRegExpUnicodeEscapeSequence(state, forceU)) {
    		      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$1.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$1.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$1.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$1.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, false) ||
    		      (!state.switchU && this.regexp_eatLegacyOctalEscapeSequence(state)) ||
    		      this.regexp_eatIdentityEscape(state)
    		    )
    		  };
    		  pp$1.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$1.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$1.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$1.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$1.regexp_eatRegExpUnicodeEscapeSequence = function(state, forceU) {
    		    if ( forceU === void 0 ) forceU = false;

    		    var start = state.pos;
    		    var switchU = forceU || state.switchU;

    		    if (state.eat(0x75 /* u */)) {
    		      if (this.regexp_eatFixedHexDigits(state, 4)) {
    		        var lead = state.lastIntValue;
    		        if (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 (
    		        switchU &&
    		        state.eat(0x7B /* { */) &&
    		        this.regexp_eatHexDigits(state) &&
    		        state.eat(0x7D /* } */) &&
    		        isValidUnicode(state.lastIntValue)
    		      ) {
    		        return true
    		      }
    		      if (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$1.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$1.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$1.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$1.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$1.regexp_validateUnicodePropertyNameAndValue = function(state, name, value) {
    		    if (!hasOwn(state.unicodeProperties.nonBinary, name))
    		      { state.raise("Invalid property name"); }
    		    if (!state.unicodeProperties.nonBinary[name].test(value))
    		      { state.raise("Invalid property value"); }
    		  };
    		  pp$1.regexp_validateUnicodePropertyNameOrValue = function(state, nameOrValue) {
    		    if (!state.unicodeProperties.binary.test(nameOrValue))
    		      { state.raise("Invalid property name"); }
    		  };

    		  // UnicodePropertyName ::
    		  //   UnicodePropertyNameCharacters
    		  pp$1.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$1.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$1.regexp_eatLoneUnicodePropertyNameOrValue = function(state) {
    		    return this.regexp_eatUnicodePropertyValue(state)
    		  };

    		  // https://www.ecma-international.org/ecma-262/8.0/#prod-CharacterClass
    		  pp$1.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$1.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$1.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$1.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$1.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$1.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$1.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$1.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$1.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$1.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$1.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 = Parser.prototype;

    		  // Move to the next token

    		  pp.next = function(ignoreEscapeSequenceInKeyword) {
    		    if (!ignoreEscapeSequenceInKeyword && this.type.keyword && this.containsEsc)
    		      { this.raiseRecoverable(this.start, "Escape sequence in keyword " + this.type.keyword); }
    		    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.getToken = function() {
    		    this.next();
    		    return new Token(this)
    		  };

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

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

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

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

    		  pp.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$1.eof) }

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

    		  pp.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.fullCharCodeAtPos = function() {
    		    var code = this.input.charCodeAt(this.pos);
    		    if (code <= 0xd7ff || code >= 0xdc00) { return code }
    		    var next = this.input.charCodeAt(this.pos + 1);
    		    return next <= 0xdbff || next >= 0xe000 ? code : (code << 10) + next - 0x35fdc00
    		  };

    		  pp.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) {
    		      for (var nextBreak = (void 0), pos = start; (nextBreak = nextLineBreak(this.input, pos, this.pos)) > -1;) {
    		        ++this.curLine;
    		        pos = this.lineStart = nextBreak;
    		      }
    		    }
    		    if (this.options.onComment)
    		      { this.options.onComment(true, this.input.slice(start + 2, end), start, this.pos,
    		                             startLoc, this.curPosition()); }
    		  };

    		  pp.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.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.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.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$1.ellipsis)
    		    } else {
    		      ++this.pos;
    		      return this.finishToken(types$1.dot)
    		    }
    		  };

    		  pp.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$1.assign, 2) }
    		    return this.finishOp(types$1.slash, 1)
    		  };

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

    		    // exponentiation operator ** and **=
    		    if (this.options.ecmaVersion >= 7 && code === 42 && next === 42) {
    		      ++size;
    		      tokentype = types$1.starstar;
    		      next = this.input.charCodeAt(this.pos + 2);
    		    }

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

    		  pp.readToken_pipe_amp = function(code) { // '|&'
    		    var next = this.input.charCodeAt(this.pos + 1);
    		    if (next === code) {
    		      if (this.options.ecmaVersion >= 12) {
    		        var next2 = this.input.charCodeAt(this.pos + 2);
    		        if (next2 === 61) { return this.finishOp(types$1.assign, 3) }
    		      }
    		      return this.finishOp(code === 124 ? types$1.logicalOR : types$1.logicalAND, 2)
    		    }
    		    if (next === 61) { return this.finishOp(types$1.assign, 2) }
    		    return this.finishOp(code === 124 ? types$1.bitwiseOR : types$1.bitwiseAND, 1)
    		  };

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

    		  pp.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$1.incDec, 2)
    		    }
    		    if (next === 61) { return this.finishOp(types$1.assign, 2) }
    		    return this.finishOp(types$1.plusMin, 1)
    		  };

    		  pp.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$1.assign, size + 1) }
    		      return this.finishOp(types$1.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$1.relational, size)
    		  };

    		  pp.readToken_eq_excl = function(code) { // '=!'
    		    var next = this.input.charCodeAt(this.pos + 1);
    		    if (next === 61) { return this.finishOp(types$1.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$1.arrow)
    		    }
    		    return this.finishOp(code === 61 ? types$1.eq : types$1.prefix, 1)
    		  };

    		  pp.readToken_question = function() { // '?'
    		    var ecmaVersion = this.options.ecmaVersion;
    		    if (ecmaVersion >= 11) {
    		      var next = this.input.charCodeAt(this.pos + 1);
    		      if (next === 46) {
    		        var next2 = this.input.charCodeAt(this.pos + 2);
    		        if (next2 < 48 || next2 > 57) { return this.finishOp(types$1.questionDot, 2) }
    		      }
    		      if (next === 63) {
    		        if (ecmaVersion >= 12) {
    		          var next2$1 = this.input.charCodeAt(this.pos + 2);
    		          if (next2$1 === 61) { return this.finishOp(types$1.assign, 3) }
    		        }
    		        return this.finishOp(types$1.coalesce, 2)
    		      }
    		    }
    		    return this.finishOp(types$1.question, 1)
    		  };

    		  pp.readToken_numberSign = function() { // '#'
    		    var ecmaVersion = this.options.ecmaVersion;
    		    var code = 35; // '#'
    		    if (ecmaVersion >= 13) {
    		      ++this.pos;
    		      code = this.fullCharCodeAtPos();
    		      if (isIdentifierStart(code, true) || code === 92 /* '\' */) {
    		        return this.finishToken(types$1.privateId, this.readWord1())
    		      }
    		    }

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

    		  pp.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$1.parenL)
    		    case 41: ++this.pos; return this.finishToken(types$1.parenR)
    		    case 59: ++this.pos; return this.finishToken(types$1.semi)
    		    case 44: ++this.pos; return this.finishToken(types$1.comma)
    		    case 91: ++this.pos; return this.finishToken(types$1.bracketL)
    		    case 93: ++this.pos; return this.finishToken(types$1.bracketR)
    		    case 123: ++this.pos; return this.finishToken(types$1.braceL)
    		    case 125: ++this.pos; return this.finishToken(types$1.braceR)
    		    case 58: ++this.pos; return this.finishToken(types$1.colon)

    		    case 96: // '`'
    		      if (this.options.ecmaVersion < 6) { break }
    		      ++this.pos;
    		      return this.finishToken(types$1.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 63: // '?'
    		      return this.readToken_question()

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

    		    case 35: // '#'
    		      return this.readToken_numberSign()
    		    }

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

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

    		  pp.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$1.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.readInt = function(radix, len, maybeLegacyOctalNumericLiteral) {
    		    // `len` is used for character escape sequences. In that case, disallow separators.
    		    var allowSeparators = this.options.ecmaVersion >= 12 && len === undefined;

    		    // `maybeLegacyOctalNumericLiteral` is true if it doesn't have prefix (0x,0o,0b)
    		    // and isn't fraction part nor exponent part. In that case, if the first digit
    		    // is zero then disallow separators.
    		    var isLegacyOctalNumericLiteral = maybeLegacyOctalNumericLiteral && this.input.charCodeAt(this.pos) === 48;

    		    var start = this.pos, total = 0, lastCode = 0;
    		    for (var i = 0, e = len == null ? Infinity : len; i < e; ++i, ++this.pos) {
    		      var code = this.input.charCodeAt(this.pos), val = (void 0);

    		      if (allowSeparators && code === 95) {
    		        if (isLegacyOctalNumericLiteral) { this.raiseRecoverable(this.pos, "Numeric separator is not allowed in legacy octal numeric literals"); }
    		        if (lastCode === 95) { this.raiseRecoverable(this.pos, "Numeric separator must be exactly one underscore"); }
    		        if (i === 0) { this.raiseRecoverable(this.pos, "Numeric separator is not allowed at the first of digits"); }
    		        lastCode = code;
    		        continue
    		      }

    		      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 }
    		      lastCode = code;
    		      total = total * radix + val;
    		    }

    		    if (allowSeparators && lastCode === 95) { this.raiseRecoverable(this.pos - 1, "Numeric separator is not allowed at the last of digits"); }
    		    if (this.pos === start || len != null && this.pos - start !== len) { return null }

    		    return total
    		  };

    		  function stringToNumber(str, isLegacyOctalNumericLiteral) {
    		    if (isLegacyOctalNumericLiteral) {
    		      return parseInt(str, 8)
    		    }

    		    // `parseFloat(value)` stops parsing at the first numeric separator then returns a wrong value.
    		    return parseFloat(str.replace(/_/g, ""))
    		  }

    		  function stringToBigInt(str) {
    		    if (typeof BigInt !== "function") {
    		      return null
    		    }

    		    // `BigInt(value)` throws syntax error if the string contains numeric separators.
    		    return BigInt(str.replace(/_/g, ""))
    		  }

    		  pp.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 = stringToBigInt(this.input.slice(start, this.pos));
    		      ++this.pos;
    		    } else if (isIdentifierStart(this.fullCharCodeAtPos())) { this.raise(this.pos, "Identifier directly after number"); }
    		    return this.finishToken(types$1.num, val)
    		  };

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

    		  pp.readNumber = function(startsWithDot) {
    		    var start = this.pos;
    		    if (!startsWithDot && this.readInt(10, undefined, true) === 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"); }
    		    var next = this.input.charCodeAt(this.pos);
    		    if (!octal && !startsWithDot && this.options.ecmaVersion >= 11 && next === 110) {
    		      var val$1 = stringToBigInt(this.input.slice(start, this.pos));
    		      ++this.pos;
    		      if (isIdentifierStart(this.fullCharCodeAtPos())) { this.raise(this.pos, "Identifier directly after number"); }
    		      return this.finishToken(types$1.num, val$1)
    		    }
    		    if (octal && /[89]/.test(this.input.slice(start, this.pos))) { octal = false; }
    		    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 val = stringToNumber(this.input.slice(start, this.pos), octal);
    		    return this.finishToken(types$1.num, val)
    		  };

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

    		  pp.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
    		  };

    		  pp.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 (ch === 0x2028 || ch === 0x2029) {
    		        if (this.options.ecmaVersion < 10) { this.raise(this.start, "Unterminated string constant"); }
    		        ++this.pos;
    		        if (this.options.locations) {
    		          this.curLine++;
    		          this.lineStart = this.pos;
    		        }
    		      } else {
    		        if (isNewLine(ch)) { this.raise(this.start, "Unterminated string constant"); }
    		        ++this.pos;
    		      }
    		    }
    		    out += this.input.slice(chunkStart, this.pos++);
    		    return this.finishToken(types$1.string, out)
    		  };

    		  // Reads template string tokens.

    		  var INVALID_TEMPLATE_ESCAPE_ERROR = {};

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

    		  pp.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$1.template || this.type === types$1.invalidTemplate)) {
    		          if (ch === 36) {
    		            this.pos += 2;
    		            return this.finishToken(types$1.dollarBraceL)
    		          } else {
    		            ++this.pos;
    		            return this.finishToken(types$1.backQuote)
    		          }
    		        }
    		        out += this.input.slice(chunkStart, this.pos);
    		        return this.finishToken(types$1.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.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$1.invalidTemplate, this.input.slice(this.start, this.pos))

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

    		  // Used to read escaped characters

    		  pp.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(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 ""
    		    case 56:
    		    case 57:
    		      if (this.strict) {
    		        this.invalidStringToken(
    		          this.pos - 1,
    		          "Invalid escape sequence"
    		        );
    		      }
    		      if (inTemplate) {
    		        var codePos = this.pos - 1;

    		        this.invalidStringToken(
    		          codePos,
    		          "Invalid escape sequence in template string"
    		        );
    		      }
    		    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.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.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(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.readWord = function() {
    		    var word = this.readWord1();
    		    var type = types$1.name;
    		    if (this.keywords.test(word)) {
    		      type = keywords[word];
    		    }
    		    return this.finishToken(type, word)
    		  };

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

    		  var version = "8.8.2";

    		  Parser.acorn = {
    		    Parser: Parser,
    		    version: version,
    		    defaultOptions: defaultOptions,
    		    Position: Position,
    		    SourceLocation: SourceLocation,
    		    getLineInfo: getLineInfo,
    		    Node: Node,
    		    TokenType: TokenType,
    		    tokTypes: types$1,
    		    keywordTypes: keywords,
    		    TokContext: TokContext,
    		    tokContexts: types,
    		    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;
    		  exports.lineBreak = lineBreak;
    		  exports.lineBreakG = lineBreakG;
    		  exports.nonASCIIwhitespace = nonASCIIwhitespace;
    		  exports.parse = parse;
    		  exports.parseExpressionAt = parseExpressionAt;
    		  exports.tokContexts = types;
    		  exports.tokTypes = types$1;
    		  exports.tokenizer = tokenizer;
    		  exports.version = version;

    		})); 
    	} (acorn$1, acorn$1.exports));
    	return acorn$1.exports;
    }

    /* eslint-disable complexity */

    var acorn = requireAcorn();
    var sourceMap = requireSourceMap();
    const NEWLINE_CODE = 10;

    function prettyFast(input, options) {
      return new PrettyFast(options).getPrettifiedCodeAndSourceMap(input);
    }

    // If any of these tokens are seen before a "[" token, we know that "[" token
    // is the start of an array literal, rather than a property access.
    //
    // The only exception is "}", which would need to be disambiguated by
    // parsing. The majority of the time, an open bracket following a closing
    // curly is going to be an array literal, so we brush the complication under
    // the rug, and handle the ambiguity by always assuming that it will be an
    // array literal.
    const PRE_ARRAY_LITERAL_TOKENS = new Set([
      "typeof",
      "void",
      "delete",
      "case",
      "do",
      "=",
      "in",
      "of",
      "...",
      "{",
      "*",
      "/",
      "%",
      "else",
      ";",
      "++",
      "--",
      "+",
      "-",
      "~",
      "!",
      ":",
      "?",
      ">>",
      ">>>",
      "<<",
      "||",
      "&&",
      "<",
      ">",
      "<=",
      ">=",
      "instanceof",
      "&",
      "^",
      "|",
      "==",
      "!=",
      "===",
      "!==",
      ",",
      "}",
    ]);

    // If any of these tokens are seen before a "{" token, we know that "{" token
    // is the start of an object literal, rather than the start of a block.
    const PRE_OBJECT_LITERAL_TOKENS = new Set([
      "typeof",
      "void",
      "delete",
      "=",
      "in",
      "of",
      "...",
      "*",
      "/",
      "%",
      "++",
      "--",
      "+",
      "-",
      "~",
      "!",
      ">>",
      ">>>",
      "<<",
      "<",
      ">",
      "<=",
      ">=",
      "instanceof",
      "&",
      "^",
      "|",
      "==",
      "!=",
      "===",
      "!==",
    ]);

    class PrettyFast {
      /**
       * @param {Object} options: Provides configurability of the pretty printing.
       * @param {String} options.url: The URL string of the ugly JS code.
       * @param {String} options.indent: The string to indent code by.
       * @param {SourceMapGenerator} options.sourceMapGenerator: An optional sourceMapGenerator
       *                             the mappings will be added to.
       * @param {Boolean} options.prefixWithNewLine: When true, the pretty printed code will start
       *                  with a line break
       * @param {Integer} options.originalStartLine: The line the passed script starts at (1-based).
       *                  This is used for inline scripts where we need to account for the lines
       *                  before the script tag
       * @param {Integer} options.originalStartColumn: The column the passed script starts at (1-based).
       *                  This is used for inline scripts where we need to account for the position
       *                  of the script tag within the line.
       * @param {Integer} options.generatedStartLine: The line where the pretty printed script
       *                  will start at (1-based). This is used for pretty printing HTML file,
       *                  where we might have handle previous inline scripts that impact the
       *                  position of this script.
       */
      constructor(options = {}) {
        // The level of indents deep we are.
        this.#indentLevel = 0;
        this.#indentChar = options.indent;

        // We will handle mappings between ugly and pretty printed code in this SourceMapGenerator.
        this.#sourceMapGenerator =
          options.sourceMapGenerator ||
          new sourceMap.SourceMapGenerator({
            file: options.url,
          });

        this.#file = options.url;
        this.#hasOriginalStartLine = "originalStartLine" in options;
        this.#hasOriginalStartColumn = "originalStartColumn" in options;
        this.#hasGeneratedStartLine = "generatedStartLine" in options;
        this.#originalStartLine = options.originalStartLine;
        this.#originalStartColumn = options.originalStartColumn;
        this.#generatedStartLine = options.generatedStartLine;
        this.#prefixWithNewLine = options.prefixWithNewLine;
      }

      /* options */
      #indentChar;
      #indentLevel;
      #file;
      #hasOriginalStartLine;
      #hasOriginalStartColumn;
      #hasGeneratedStartLine;
      #originalStartLine;
      #originalStartColumn;
      #prefixWithNewLine;
      #generatedStartLine;
      #sourceMapGenerator;

      /* internals */

      // Whether or not we added a newline on after we added the previous token.
      #addedNewline = false;
      // Whether or not we added a space after we added the previous token.
      #addedSpace = false;
      #currentCode = "";
      #currentLine = 1;
      #currentColumn = 0;
      // The tokens parsed by acorn.
      #tokenQueue;
      // The index of the current token in this.#tokenQueue.
      #currentTokenIndex;
      // The previous token we added to the pretty printed code.
      #previousToken;
      // Stack of token types/keywords that can affect whether we want to add a
      // newline or a space. We can make that decision based on what token type is
      // on the top of the stack. For example, a comma in a parameter list should
      // be followed by a space, while a comma in an object literal should be
      // followed by a newline.
      //
      // Strings that go on the stack:
      //
      //   - "{"
      //   - "{\n"
      //   - "("
      //   - "(\n"
      //   - "["
      //   - "[\n"
      //   - "do"
      //   - "?"
      //   - "switch"
      //   - "case"
      //   - "default"
      //
      // The difference between "[" and "[\n" (as well as "{" and "{\n", and "(" and "(\n")
      // is that "\n" is used when we are treating (curly) brackets/parens as line delimiters
      // and should increment and decrement the indent level when we find them.
      // "[" can represent either a property access (e.g. `x["hi"]`), or an empty array literal
      // "{" only represents an empty object literals
      // "(" can represent lots of different things (wrapping expression, if/loop condition, function call, …)
      #stack = [];

      /**
       * @param {String} input: The ugly JS code we want to pretty print.
       * @returns {Object}
       *          An object with the following properties:
       *            - code: The pretty printed code string.
       *            - map: A SourceMapGenerator instance.
       */
      getPrettifiedCodeAndSourceMap(input) {
        // Add the initial new line if needed
        if (this.#prefixWithNewLine) {
          this.#write("\n");
        }

        // Pass through acorn's tokenizer and append tokens and comments into a
        // single queue to process.  For example, the source file:
        //
        //     foo
        //     // a
        //     // b
        //     bar
        //
        // After this process, tokenQueue has the following token stream:
        //
        //     [ foo, '// a', '// b', bar]
        this.#tokenQueue = this.#getTokens(input);

        for (let i = 0, len = this.#tokenQueue.length; i < len; i++) {
          this.#currentTokenIndex = i;
          const token = this.#tokenQueue[i];
          const nextToken = this.#tokenQueue[i + 1];
          this.#handleToken(token, nextToken);

          // Acorn's tokenizer re-uses tokens, so we have to copy the previous token on
          // every iteration. We follow acorn's lead here, and reuse the previousToken
          // object the same way that acorn reuses the token object. This allows us
          // to avoid allocations and minimize GC pauses.
          if (!this.#previousToken) {
            this.#previousToken = { loc: { start: {}, end: {} } };
          }
          this.#previousToken.start = token.start;
          this.#previousToken.end = token.end;
          this.#previousToken.loc.start.line = token.loc.start.line;
          this.#previousToken.loc.start.column = token.loc.start.column;
          this.#previousToken.loc.end.line = token.loc.end.line;
          this.#previousToken.loc.end.column = token.loc.end.column;
          this.#previousToken.type = token.type;
          this.#previousToken.value = token.value;
        }

        return { code: this.#currentCode, map: this.#sourceMapGenerator };
      }

      /**
       * Write a pretty printed string to the prettified string and for tokens, add their
       * mapping to the SourceMapGenerator.
       *
       * @param String str
       *        The string to be added to the result.
       * @param Number line
       *        The line number the string came from in the ugly source.
       * @param Number column
       *        The column number the string came from in the ugly source.
       * @param Boolean isToken
       *        Set to true when writing tokens, so we can differentiate them from the
       *        whitespace we add.
       */
      #write(str, line, column, isToken) {
        this.#currentCode += str;
        if (isToken) {
          this.#sourceMapGenerator.addMapping({
            source: this.#file,
            // We need to swap original and generated locations, as the prettified text should
            // be seen by the sourcemap service as the "original" one.
            generated: {
              // originalStartLine is 1-based, and here we just want to offset by a number of
              // lines, so we need to decrement it
              line: this.#hasOriginalStartLine
                ? line + (this.#originalStartLine - 1)
                : line,
              // We only need to adjust the column number if we're looking at the first line, to
              // account for the html text before the opening <script> tag.
              column:
                line == 1 && this.#hasOriginalStartColumn
                  ? column + this.#originalStartColumn
                  : column,
            },
            original: {
              // generatedStartLine is 1-based, and here we just want to offset by a number of
              // lines, so we need to decrement it.
              line: this.#hasGeneratedStartLine
                ? this.#currentLine + (this.#generatedStartLine - 1)
                : this.#currentLine,
              column: this.#currentColumn,
            },
            name: null,
          });
        }

        for (let idx = 0, length = str.length; idx < length; idx++) {
          if (str.charCodeAt(idx) === NEWLINE_CODE) {
            this.#currentLine++;
            this.#currentColumn = 0;
          } else {
            this.#currentColumn++;
          }
        }
      }

      /**
       * Add the given token to the pretty printed results.
       *
       * @param Object token
       *        The token to add.
       */
      #writeToken(token) {
        if (token.type.label == "string") {
          this.#write(
            `'${stringSanitize(token.value)}'`,
            token.loc.start.line,
            token.loc.start.column,
            true
          );
        } else if (token.type.label == "template") {
          // The backticks, '${', '}' and the template literal's string content are
          // all separate tokens.
          //
          // For example, `AAA${BBB}CCC` becomes the following token sequence,
          // where the first template's token.value being 'AAA' and the second
          // template's token.value being 'CCC'.
          //
          //  * token.type.label == '`'
          //  * token.type.label == 'template'
          //  * token.type.label == '${'
          //  * token.type.label == 'name'
          //  * token.type.label == '}'
          //  * token.type.label == 'template'
          //  * token.type.label == '`'
          //
          // So, just sanitize the token.value without enclosing with backticks.
          this.#write(
            templateSanitize(token.value),
            token.loc.start.line,
            token.loc.start.column,
            true
          );
        } else if (token.type.label == "regexp") {
          this.#write(
            String(token.value.value),
            token.loc.start.line,
            token.loc.start.column,
            true
          );
        } else {
          let value;
          if (token.value != null) {
            value = token.value;
            if (token.type.label === "privateId") {
              value = `#${value}`;
            }
          } else {
            value = token.type.label;
          }
          this.#write(
            String(value),
            token.loc.start.line,
            token.loc.start.column,
            true
          );
        }
      }

      /**
       * Returns the tokens computed with acorn.
       *
       * @param String input
       *        The JS code we want the tokens of.
       * @returns Array<Object>
       */
      #getTokens(input) {
        const tokens = [];

        const res = acorn.tokenizer(input, {
          locations: true,
          ecmaVersion: "latest",
          onComment(block, text, start, end, startLoc, endLoc) {
            tokens.push({
              type: {},
              comment: true,
              block,
              text,
              loc: { start: startLoc, end: endLoc },
            });
          },
        });

        for (;;) {
          const token = res.getToken();
          tokens.push(token);
          if (token.type.label == "eof") {
            break;
          }
        }

        return tokens;
      }

      /**
       * Add the required whitespace before this token, whether that is a single
       * space, newline, and/or the indent on fresh lines.
       *
       * @param Object token
       *        The token we are currently handling.
       * @param {Object|undefined} nextToken
       *        The next token, might not exist if we're on the last token
       */
      #handleToken(token, nextToken) {
        if (token.comment) {
          let commentIndentLevel = this.#indentLevel;
          if (this.#previousToken?.loc?.end?.line == token.loc.start.line) {
            commentIndentLevel = 0;
            this.#write(" ");
          }
          this.#addComment(
            commentIndentLevel,
            token.block,
            token.text,
            token.loc.start.line,
            nextToken
          );
          return;
        }

        // Shorthand for token.type.keyword, so we don't have to repeatedly access
        // properties.
        const ttk = token.type.keyword;

        if (ttk && this.#previousToken?.type?.label == ".") {
          token.type = acorn.tokTypes.name;
        }

        // Shorthand for token.type.label, so we don't have to repeatedly access
        // properties.
        const ttl = token.type.label;

        if (ttl == "eof") {
          if (!this.#addedNewline) {
            this.#write("\n");
          }
          return;
        }

        if (belongsOnStack(token)) {
          let stackEntry;

          if (isArrayLiteral(token, this.#previousToken)) {
            // Don't add new lines for empty array literals
            stackEntry = nextToken?.type?.label === "]" ? "[" : "[\n";
          } else if (isObjectLiteral(token, this.#previousToken)) {
            // Don't add new lines for empty object literals
            stackEntry = nextToken?.type?.label === "}" ? "{" : "{\n";
          } else if (
            isRoundBracketStartingLongParenthesis(
              token,
              this.#tokenQueue,
              this.#currentTokenIndex
            )
          ) {
            stackEntry = "(\n";
          } else if (ttl == "{") {
            // We need to add a line break for "{" which are not empty object literals
            stackEntry = "{\n";
          } else {
            stackEntry = ttl || ttk;
          }

          this.#stack.push(stackEntry);
        }

        this.#maybeDecrementIndent(token);
        this.#prependWhiteSpace(token);
        this.#writeToken(token);
        this.#addedSpace = false;

        // If the next token is going to be a comment starting on the same line,
        // then no need to add a new line here
        if (
          !nextToken ||
          !nextToken.comment ||
          token.loc.end.line != nextToken.loc.start.line
        ) {
          this.#maybeAppendNewline(token);
        }

        this.#maybePopStack(token);
        this.#maybeIncrementIndent(token);
      }

      /**
       * Returns true if the given token should cause us to pop the stack.
       */
      #maybePopStack(token) {
        const ttl = token.type.label;
        const ttk = token.type.keyword;
        const top = this.#stack.at(-1);

        if (
          ttl == "]" ||
          ttl == ")" ||
          ttl == "}" ||
          (ttl == ":" && (top == "case" || top == "default" || top == "?")) ||
          (ttk == "while" && top == "do")
        ) {
          this.#stack.pop();
          if (ttl == "}" && this.#stack.at(-1) == "switch") {
            this.#stack.pop();
          }
        }
      }

      #maybeIncrementIndent(token) {
        if (
          // Don't increment indent for empty object literals
          (token.type.label == "{" && this.#stack.at(-1) === "{\n") ||
          // Don't increment indent for empty array literals
          (token.type.label == "[" && this.#stack.at(-1) === "[\n") ||
          token.type.keyword == "switch" ||
          (token.type.label == "(" && this.#stack.at(-1) === "(\n")
        ) {
          this.#indentLevel++;
        }
      }

      #shouldDecrementIndent(token) {
        const top = this.#stack.at(-1);
        const ttl = token.type.label;
        return (
          (ttl == "}" && top == "{\n") ||
          (ttl == "]" && top == "[\n") ||
          (ttl == ")" && top == "(\n")
        );
      }

      #maybeDecrementIndent(token) {
        if (!this.#shouldDecrementIndent(token)) {
          return;
        }

        const ttl = token.type.label;
        this.#indentLevel--;
        if (ttl == "}" && this.#stack.at(-2) == "switch") {
          this.#indentLevel--;
        }
      }

      /**
       * Add a comment to the pretty printed code.
       *
       * @param Number indentLevel
       *        The number of indents deep we are (might be different from this.#indentLevel).
       * @param Boolean block
       *        True if the comment is a multiline block style comment.
       * @param String text
       *        The text of the comment.
       * @param Number line
       *        The line number to comment appeared on.
       * @param Object nextToken
       *        The next token if any.
       */
      #addComment(indentLevel, block, text, line, nextToken) {
        const indentString = this.#indentChar.repeat(indentLevel);
        const needNewLineAfter =
          !block || !(nextToken && nextToken.loc.start.line == line);

        if (block) {
          const commentLinesText = text
            .split(new RegExp(`/\n${indentString}/`, "g"))
            .join(`\n${indentString}`);

          this.#write(
            `${indentString}/*${commentLinesText}*/${needNewLineAfter ? "\n" : " "}`
          );
        } else {
          this.#write(`${indentString}//${text}\n`);
        }

        this.#addedNewline = needNewLineAfter;
        this.#addedSpace = !needNewLineAfter;
      }

      /**
       * Add the required whitespace before this token, whether that is a single
       * space, newline, and/or the indent on fresh lines.
       *
       * @param Object token
       *        The token we are about to add to the pretty printed code.
       */
      #prependWhiteSpace(token) {
        const ttk = token.type.keyword;
        const ttl = token.type.label;
        let newlineAdded = this.#addedNewline;
        let spaceAdded = this.#addedSpace;
        const ltt = this.#previousToken?.type?.label;

        // Handle whitespace and newlines after "}" here instead of in
        // `isLineDelimiter` because it is only a line delimiter some of the
        // time. For example, we don't want to put "else if" on a new line after
        // the first if's block.
        if (this.#previousToken && ltt == "}") {
          if (
            (ttk == "while" && this.#stack.at(-1) == "do") ||
            needsSpaceBeforeClosingCurlyBracket(ttk)
          ) {
            this.#write(" ");
            spaceAdded = true;
          } else if (needsLineBreakBeforeClosingCurlyBracket(ttl)) {
            this.#write("\n");
            newlineAdded = true;
          }
        }

        if (
          (ttl == ":" && this.#stack.at(-1) == "?") ||
          (ttl == "}" && this.#stack.at(-1) == "${")
        ) {
          this.#write(" ");
          spaceAdded = true;
        }

        if (this.#previousToken && ltt != "}" && ltt != "." && ttk == "else") {
          this.#write(" ");
          spaceAdded = true;
        }

        const ensureNewline = () => {
          if (!newlineAdded) {
            this.#write("\n");
            newlineAdded = true;
          }
        };

        if (isASI(token, this.#previousToken)) {
          ensureNewline();
        }

        if (this.#shouldDecrementIndent(token)) {
          ensureNewline();
        }

        if (newlineAdded) {
          let indentLevel = this.#indentLevel;
          if (ttk == "case" || ttk == "default") {
            indentLevel--;
          }
          this.#write(this.#indentChar.repeat(indentLevel));
        } else if (!spaceAdded && needsSpaceAfter(token, this.#previousToken)) {
          this.#write(" ");
          spaceAdded = true;
        }
      }

      /**
       * Append the necessary whitespace to the result after we have added the given
       * token.
       *
       * @param Object token
       *        The token that was just added to the result.
       */
      #maybeAppendNewline(token) {
        if (!isLineDelimiter(token, this.#stack)) {
          this.#addedNewline = false;
          return;
        }

        this.#write("\n");
        this.#addedNewline = true;
      }
    }

    /**
     * Determines if we think that the given token starts an array literal.
     *
     * @param Object token
     *        The token we want to determine if it is an array literal.
     * @param Object previousToken
     *        The previous token we added to the pretty printed results.
     *
     * @returns Boolean
     *          True if we believe it is an array literal, false otherwise.
     */
    function isArrayLiteral(token, previousToken) {
      if (token.type.label != "[") {
        return false;
      }
      if (!previousToken) {
        return true;
      }
      if (previousToken.type.isAssign) {
        return true;
      }

      return PRE_ARRAY_LITERAL_TOKENS.has(
        previousToken.type.keyword ||
          // Some tokens ('of', 'yield', …) have a `token.type.keyword` of 'name' and their
          // actual value in `token.value`
          (previousToken.type.label == "name"
            ? previousToken.value
            : previousToken.type.label)
      );
    }

    /**
     * Determines if we think that the given token starts an object literal.
     *
     * @param Object token
     *        The token we want to determine if it is an object literal.
     * @param Object previousToken
     *        The previous token we added to the pretty printed results.
     *
     * @returns Boolean
     *          True if we believe it is an object literal, false otherwise.
     */
    function isObjectLiteral(token, previousToken) {
      if (token.type.label != "{") {
        return false;
      }
      if (!previousToken) {
        return false;
      }
      if (previousToken.type.isAssign) {
        return true;
      }
      return PRE_OBJECT_LITERAL_TOKENS.has(
        previousToken.type.keyword || previousToken.type.label
      );
    }

    /**
     * Determines if we think that the given token starts a long parenthesis
     *
     * @param {Object} token
     *        The token we want to determine if it is the beginning of a long paren.
     * @param {Array<Object>} tokenQueue
     *        The whole list of tokens parsed by acorn
     * @param {Integer} currentTokenIndex
     *        The index of `token` in `tokenQueue`
     * @returns
     */
    function isRoundBracketStartingLongParenthesis(
      token,
      tokenQueue,
      currentTokenIndex
    ) {
      if (token.type.label !== "(") {
        return false;
      }

      // If we're just wrapping an object, we'll have a new line right after
      if (tokenQueue[currentTokenIndex + 1].type.label == "{") {
        return false;
      }

      // We're going to iterate through the following tokens until :
      // - we find the closing parent
      // - or we reached the maximum character we think should be in parenthesis
      const longParentContentLength = 60;

      // Keep track of other parens so we know when we get the closing one for `token`
      let parenCount = 0;
      let parenContentLength = 0;
      for (let i = currentTokenIndex + 1, len = tokenQueue.length; i < len; i++) {
        const currToken = tokenQueue[i];
        const ttl = currToken.type.label;

        if (ttl == "(") {
          parenCount++;
        } else if (ttl == ")") {
          if (parenCount == 0) {
            // Matching closing paren, if we got here, we didn't reach the length limit,
            // as we return when parenContentLength is greater than the limit.
            return false;
          }
          parenCount--;
        }

        // Aside block comments, all tokens start and end location are on the same line, so
        // we can use `start` and `end` to deduce the token length.
        const tokenLength = currToken.comment
          ? currToken.text.length
          : currToken.end - currToken.start;
        parenContentLength += tokenLength;

        // If we didn't find the matching closing paren yet and the characters from the
        // tokens we evaluated so far are longer than the limit, so consider the token
        // a long paren.
        if (parenContentLength > longParentContentLength) {
          return true;
        }
      }

      // if we get to here, we didn't found a closing paren, which shouldn't happen
      // (scripts with syntax error are not displayed in the debugger), but just to
      // be safe, return false.
      return false;
    }

    // If any of these tokens are followed by a token on a new line, we know that
    // ASI cannot happen.
    const PREVENT_ASI_AFTER_TOKENS = new Set([
      // Binary operators
      "*",
      "/",
      "%",
      "+",
      "-",
      "<<",
      ">>",
      ">>>",
      "<",
      ">",
      "<=",
      ">=",
      "instanceof",
      "in",
      "==",
      "!=",
      "===",
      "!==",
      "&",
      "^",
      "|",
      "&&",
      "||",
      ",",
      ".",
      "=",
      "*=",
      "/=",
      "%=",
      "+=",
      "-=",
      "<<=",
      ">>=",
      ">>>=",
      "&=",
      "^=",
      "|=",
      // Unary operators
      "delete",
      "void",
      "typeof",
      "~",
      "!",
      "new",
      // Function calls and grouped expressions
      "(",
    ]);

    // If any of these tokens are on a line after the token before it, we know
    // that ASI cannot happen.
    const PREVENT_ASI_BEFORE_TOKENS = new Set([
      // Binary operators
      "*",
      "/",
      "%",
      "<<",
      ">>",
      ">>>",
      "<",
      ">",
      "<=",
      ">=",
      "instanceof",
      "in",
      "==",
      "!=",
      "===",
      "!==",
      "&",
      "^",
      "|",
      "&&",
      "||",
      ",",
      ".",
      "=",
      "*=",
      "/=",
      "%=",
      "+=",
      "-=",
      "<<=",
      ">>=",
      ">>>=",
      "&=",
      "^=",
      "|=",
      // Function calls
      "(",
    ]);

    /**
     * Determine if a token can look like an identifier. More precisely,
     * this determines if the token may end or start with a character from
     * [A-Za-z0-9_].
     *
     * @param Object token
     *        The token we are looking at.
     *
     * @returns Boolean
     *          True if identifier-like.
     */
    function isIdentifierLike(token) {
      const ttl = token.type.label;
      return (
        ttl == "name" || ttl == "num" || ttl == "privateId" || !!token.type.keyword
      );
    }

    /**
     * Determines if Automatic Semicolon Insertion (ASI) occurs between these
     * tokens.
     *
     * @param Object token
     *        The current token.
     * @param Object previousToken
     *        The previous token we added to the pretty printed results.
     *
     * @returns Boolean
     *          True if we believe ASI occurs.
     */
    function isASI(token, previousToken) {
      if (!previousToken) {
        return false;
      }
      if (token.loc.start.line === previousToken.loc.start.line) {
        return false;
      }
      if (
        previousToken.type.keyword == "return" ||
        previousToken.type.keyword == "yield" ||
        (previousToken.type.label == "name" && previousToken.value == "yield")
      ) {
        return true;
      }
      if (
        PREVENT_ASI_AFTER_TOKENS.has(
          previousToken.type.label || previousToken.type.keyword
        )
      ) {
        return false;
      }
      if (PREVENT_ASI_BEFORE_TOKENS.has(token.type.label || token.type.keyword)) {
        return false;
      }
      return true;
    }

    /**
     * Determine if we should add a newline after the given token.
     *
     * @param Object token
     *        The token we are looking at.
     * @param Array stack
     *        The stack of open parens/curlies/brackets/etc.
     *
     * @returns Boolean
     *          True if we should add a newline.
     */
    function isLineDelimiter(token, stack) {
      const ttl = token.type.label;
      const top = stack.at(-1);
      return (
        (ttl == ";" && top != "(") ||
        // Don't add a new line for empty object literals
        (ttl == "{" && top == "{\n") ||
        // Don't add a new line for empty array literals
        (ttl == "[" && top == "[\n") ||
        ((ttl == "," || ttl == "||" || ttl == "&&") && top != "(") ||
        (ttl == ":" && (top == "case" || top == "default")) ||
        (ttl == "(" && top == "(\n")
      );
    }

    /**
     * Determines if we need to add a space after the token we are about to add.
     *
     * @param Object token
     *        The token we are about to add to the pretty printed code.
     * @param Object [previousToken]
     *        Optional previous token added to the pretty printed code.
     */
    function needsSpaceAfter(token, previousToken) {
      if (previousToken && needsSpaceBetweenTokens(token, previousToken)) {
        return true;
      }

      if (token.type.isAssign) {
        return true;
      }
      if (token.type.binop != null && previousToken) {
        return true;
      }
      if (token.type.label == "?") {
        return true;
      }
      if (token.type.label == "=>") {
        return true;
      }

      return false;
    }

    function needsSpaceBeforePreviousToken(previousToken) {
      if (previousToken.type.isLoop) {
        return true;
      }
      if (previousToken.type.isAssign) {
        return true;
      }
      if (previousToken.type.binop != null) {
        return true;
      }
      if (previousToken.value == "of") {
        return true;
      }

      const previousTokenTypeLabel = previousToken.type.label;
      if (previousTokenTypeLabel == "?") {
        return true;
      }
      if (previousTokenTypeLabel == ":") {
        return true;
      }
      if (previousTokenTypeLabel == ",") {
        return true;
      }
      if (previousTokenTypeLabel == ";") {
        return true;
      }
      if (previousTokenTypeLabel == "${") {
        return true;
      }
      if (previousTokenTypeLabel == "=>") {
        return true;
      }
      return false;
    }

    function isBreakContinueOrReturnStatement(previousTokenKeyword) {
      return (
        previousTokenKeyword == "break" ||
        previousTokenKeyword == "continue" ||
        previousTokenKeyword == "return"
      );
    }

    function needsSpaceBeforePreviousTokenKeywordAfterNotDot(previousTokenKeyword) {
      return (
        previousTokenKeyword != "debugger" &&
        previousTokenKeyword != "null" &&
        previousTokenKeyword != "true" &&
        previousTokenKeyword != "false" &&
        previousTokenKeyword != "this" &&
        previousTokenKeyword != "default"
      );
    }

    function needsSpaceBeforeClosingParen(tokenTypeLabel) {
      return (
        tokenTypeLabel != ")" &&
        tokenTypeLabel != "]" &&
        tokenTypeLabel != ";" &&
        tokenTypeLabel != "," &&
        tokenTypeLabel != "."
      );
    }

    /**
     * Determines if we need to add a space between the previous token we added and
     * the token we are about to add.
     *
     * @param Object token
     *        The token we are about to add to the pretty printed code.
     * @param Object previousToken
     *        The previous token added to the pretty printed code.
     */
    function needsSpaceBetweenTokens(token, previousToken) {
      if (needsSpaceBeforePreviousToken(previousToken)) {
        return true;
      }

      const ltt = previousToken.type.label;
      if (ltt == "num" && token.type.label == ".") {
        return true;
      }

      const ltk = previousToken.type.keyword;
      const ttl = token.type.label;
      if (ltk != null && ttl != ".") {
        if (isBreakContinueOrReturnStatement(ltk)) {
          return ttl != ";";
        }
        if (needsSpaceBeforePreviousTokenKeywordAfterNotDot(ltk)) {
          return true;
        }
      }

      if (ltt == ")" && needsSpaceBeforeClosingParen(ttl)) {
        return true;
      }

      if (isIdentifierLike(token) && isIdentifierLike(previousToken)) {
        // We must emit a space to avoid merging the tokens.
        return true;
      }

      if (token.type.label == "{" && previousToken.type.label == "name") {
        return true;
      }

      return false;
    }

    function needsSpaceBeforeClosingCurlyBracket(tokenTypeKeyword) {
      return (
        tokenTypeKeyword == "else" ||
        tokenTypeKeyword == "catch" ||
        tokenTypeKeyword == "finally"
      );
    }

    function needsLineBreakBeforeClosingCurlyBracket(tokenTypeLabel) {
      return (
        tokenTypeLabel != "(" &&
        tokenTypeLabel != ";" &&
        tokenTypeLabel != "," &&
        tokenTypeLabel != ")" &&
        tokenTypeLabel != "." &&
        tokenTypeLabel != "template" &&
        tokenTypeLabel != "`"
      );
    }

    const commonEscapeCharacters = {
      // Backslash
      "\\": "\\\\",
      // Carriage return
      "\r": "\\r",
      // Tab
      "\t": "\\t",
      // Vertical tab
      "\v": "\\v",
      // Form feed
      "\f": "\\f",
      // Null character
      "\0": "\\x00",
      // Line separator
      "\u2028": "\\u2028",
      // Paragraph separator
      "\u2029": "\\u2029",
    };

    const stringEscapeCharacters = {
      ...commonEscapeCharacters,

      // Newlines
      "\n": "\\n",
      // Single quotes
      "'": "\\'",
    };

    const templateEscapeCharacters = {
      ...commonEscapeCharacters,

      // backtick
      "`": "\\`",
    };

    const stringRegExpString = `(${Object.values(stringEscapeCharacters).join(
  "|"
)})`;
    const templateRegExpString = `(${Object.values(templateEscapeCharacters).join(
  "|"
)})`;

    const stringEscapeCharactersRegExp = new RegExp(stringRegExpString, "g");
    const templateEscapeCharactersRegExp = new RegExp(templateRegExpString, "g");

    function stringSanitizerReplaceFunc(_, c) {
      return stringEscapeCharacters[c];
    }
    function templateSanitizerReplaceFunc(_, c) {
      return templateEscapeCharacters[c];
    }

    /**
     * Make sure that we output the escaped character combination inside string
     * literals instead of various problematic characters.
     */
    function stringSanitize(str) {
      return str.replace(stringEscapeCharactersRegExp, stringSanitizerReplaceFunc);
    }
    function templateSanitize(str) {
      return str.replace(
        templateEscapeCharactersRegExp,
        templateSanitizerReplaceFunc
      );
    }

    /**
     * Returns true if the given token type belongs on the stack.
     */
    function belongsOnStack(token) {
      const ttl = token.type.label;
      const ttk = token.type.keyword;
      return (
        ttl == "{" ||
        ttl == "(" ||
        ttl == "[" ||
        ttl == "?" ||
        ttl == "${" ||
        ttk == "do" ||
        ttk == "switch" ||
        ttk == "case" ||
        ttk == "default"
      );
    }

    var { SourceMapGenerator } = requireSourceMap();

    const sourceMapGeneratorByTaskId = new Map();

    function prettyPrint({ url, indent, sourceText }) {
      const { code, map: sourceMapGenerator } = prettyFast(sourceText, {
        url,
        indent,
      });

      return {
        code,
        sourceMap: sourceMapGenerator.toJSON(),
      };
    }

    function prettyPrintInlineScript({
      taskId,
      url,
      indent,
      sourceText,
      originalStartLine,
      originalStartColumn,
      generatedStartLine,
    }) {
      let taskSourceMapGenerator;
      if (!sourceMapGeneratorByTaskId.has(taskId)) {
        taskSourceMapGenerator = new SourceMapGenerator({ file: url });
        sourceMapGeneratorByTaskId.set(taskId, taskSourceMapGenerator);
      } else {
        taskSourceMapGenerator = sourceMapGeneratorByTaskId.get(taskId);
      }

      const { code } = prettyFast(sourceText, {
        url,
        indent,
        sourceMapGenerator: taskSourceMapGenerator,
        /*
         * By default prettyPrint will trim the text, and we'd have the pretty text displayed
         * just after the script tag, e.g.:
         *
         * ```
         * <script>if (true) {
         *   something()
         * }
         * </script>
         * ```
         *
         * We want the text to start on a new line, so prepend a line break, so we get
         * something like:
         *
         * ```
         * <script>
         * if (true) {
         *   something()
         * }
         * </script>
         * ```
         */
        prefixWithNewLine: true,
        originalStartLine,
        originalStartColumn,
        generatedStartLine,
      });

      // When a taskId was passed, we only return the pretty printed text.
      // The source map should be retrieved with getSourceMapForTask.
      return code;
    }

    /**
     * Get the source map for a pretty-print task
     *
     * @param {Integer} taskId: The taskId that was used to call prettyPrint
     * @returns {Object} A source map object
     */
    function getSourceMapForTask(taskId) {
      if (!sourceMapGeneratorByTaskId.has(taskId)) {
        return null;
      }

      const taskSourceMapGenerator = sourceMapGeneratorByTaskId.get(taskId);
      sourceMapGeneratorByTaskId.delete(taskId);
      return taskSourceMapGenerator.toJSON();
    }

    self.onmessage = workerUtilsExports.workerHandler({
      prettyPrint,
      prettyPrintInlineScript,
      getSourceMapForTask,
    });

}));