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_babel-node.js
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_babel-node.js
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import commander from "commander";
import Module from "module";
import { inspect } from "util";
import path from "path";
import repl from "repl";
import * as babel from "@babel/core";
import vm from "vm";
import "@babel/polyfill";
import register from "@babel/register";
import pkg from "../package.json";
const program = new commander.Command("babel-node");
function collect(value, previousValue): Array<string> {
// If the user passed the option with no value, like "babel-node file.js --presets", do nothing.
if (typeof value !== "string") return previousValue;
const values = value.split(",");
return previousValue ? previousValue.concat(values) : values;
}
/* eslint-disable max-len */
program.option("-e, --eval [script]", "Evaluate script");
program.option("-p, --print [code]", "Evaluate script and print result");
program.option(
"-o, --only [globs]",
"A comma-separated list of glob patterns to compile",
collect,
);
program.option(
"-i, --ignore [globs]",
"A comma-separated list of glob patterns to skip compiling",
collect,
);
program.option(
"-x, --extensions [extensions]",
"List of extensions to hook into [.es6,.js,.es,.jsx,.mjs]",
collect,
);
program.option("-w, --plugins [string]", "", collect);
program.option("-b, --presets [string]", "", collect);
/* eslint-enable max-len */
program.version(pkg.version);
program.usage("[options] [ -e script | script.js ] [arguments]");
program.parse(process.argv);
register({
extensions: program.extensions,
ignore: program.ignore,
only: program.only,
plugins: program.plugins,
presets: program.presets,
});
const replPlugin = ({ types: t }) => ({
visitor: {
ModuleDeclaration(path) {
throw path.buildCodeFrameError("Modules aren't supported in the REPL");
},
VariableDeclaration(path) {
if (path.node.kind !== "var") {
throw path.buildCodeFrameError(
"Only `var` variables are supported in the REPL",
);
}
},
Program(path) {
if (path.get("body").some(child => child.isExpressionStatement())) return;
// If the executed code doesn't evaluate to a value,
// prevent implicit strict mode from printing 'use strict'.
path.pushContainer(
"body",
t.expressionStatement(t.identifier("undefined")),
);
},
},
});
const _eval = function(code, filename) {
code = code.trim();
if (!code) return undefined;
code = babel.transform(code, {
filename: filename,
presets: program.presets,
plugins: (program.plugins || []).concat([replPlugin]),
}).code;
return vm.runInThisContext(code, {
filename: filename,
});
};
if (program.eval || program.print) {
let code = program.eval;
if (!code || code === true) code = program.print;
global.__filename = "[eval]";
global.__dirname = process.cwd();
const module = new Module(global.__filename);
module.filename = global.__filename;
module.paths = Module._nodeModulePaths(global.__dirname);
global.exports = module.exports;
global.module = module;
global.require = module.require.bind(module);
const result = _eval(code, global.__filename);
if (program.print) {
const output = typeof result === "string" ? result : inspect(result);
process.stdout.write(output + "\n");
}
} else {
if (program.args.length) {
// slice all arguments up to the first filename since they're babel args that we handle
let args = process.argv.slice(2);
let i = 0;
let ignoreNext = false;
args.some(function(arg, i2) {
if (ignoreNext) {
ignoreNext = false;
return;
}
if (arg[0] === "-") {
const parsedArg = program[arg.slice(2)];
if (parsedArg && parsedArg !== true) {
ignoreNext = true;
}
} else {
i = i2;
return true;
}
});
args = args.slice(i);
// make the filename absolute
const filename = args[0];
if (!path.isAbsolute(filename)) {
args[0] = path.join(process.cwd(), filename);
}
// add back on node and concat the sliced args
process.argv = ["node"].concat(args);
process.execArgv.unshift(__filename);
Module.runMain();
} else {
replStart();
}
}
function replStart() {
repl.start({
prompt: "> ",
input: process.stdin,
output: process.stdout,
eval: replEval,
useGlobal: true,
});
}
function replEval(code, context, filename, callback) {
let err;
let result;
try {
if (code[0] === "(" && code[code.length - 1] === ")") {
code = code.slice(1, -1); // remove "(" and ")"
}
result = _eval(code, filename);
} catch (e) {
err = e;
}
callback(err, result);
}