@babel/node/lib/_babel-node.js

Babel command line

import Module, { createRequire } from 'node:module';
import { inspect } from 'node:util';
import path from 'node:path';
import repl from 'node:repl';
import * as babel from '@babel/core';
import vm from 'node:vm';
import 'core-js/stable/index.js';
import register from '@babel/register';
import { fileURLToPath } from 'node:url';
import { program } from './program-setup-shared.js';

const require$1 = createRequire(import.meta.url);
program.parse(process.argv);
const opts = program.opts();
const babelOptions = {
  caller: {
    name: "@babel/node",
    supportsStaticESM: false,
    supportsDynamicImport: false,
    supportsExportNamespaceFrom: false
  },
  extensions: opts.extensions,
  ignore: opts.ignore,
  only: opts.only,
  plugins: opts.plugins,
  presets: opts.presets,
  configFile: opts.configFile,
  envName: opts.envName,
  rootMode: opts.rootMode,
  babelrc: opts.babelrc === true ? undefined : opts.babelrc
};
for (const key of Object.keys(babelOptions)) {
  if (babelOptions[key] === undefined) {
    delete babelOptions[key];
  }
}
register(babelOptions);
let hasTopLevelAwait = false;
const replPlugin = ({
  types: t
}) => ({
  visitor: {
    Program(path) {
      hasTopLevelAwait = path.node.extra?.topLevelAwait;
      let hasExpressionStatement;
      for (const bodyPath of path.get("body")) {
        if (bodyPath.isExpressionStatement()) {
          hasExpressionStatement = true;
        } else if (bodyPath.isExportDeclaration() || bodyPath.isImportDeclaration()) {
          throw bodyPath.buildCodeFrameError("Modules aren't supported in the REPL");
        }
      }
      if (hasTopLevelAwait) {
        const body = path.node.body;
        for (let i = body.length - 1; i >= 0; i--) {
          if (t.isExpressionStatement(body[i])) {
            body[i] = t.returnStatement(body[i].expression);
            break;
          }
        }
        return;
      }
      if (hasExpressionStatement) return;
      path.pushContainer("body", t.expressionStatement(t.identifier("undefined")));
    }
  }
});
const _eval = function (code, filename) {
  code = code.trim();
  if (!code) return undefined;
  hasTopLevelAwait = false;
  code = babel.transformSync(code, {
    filename: filename,
    ...babelOptions,
    parserOpts: {
      allowAwaitOutsideFunction: true
    },
    plugins: (opts.plugins || []).concat([replPlugin])
  }).code;
  if (hasTopLevelAwait) {
    code = `(async () => { ${code} })()`;
  }
  return vm.runInThisContext(code, {
    filename: filename
  });
};
if (opts.eval || opts.print) {
  let code = opts.eval;
  if (!code || code === true) code = opts.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 (opts.print) {
    const output = typeof result === "string" ? result : inspect(result);
    process.stdout.write(output + "\n");
  }
} else {
  if (program.args.length) {
    let args = process.argv.slice(2);
    let i = 0;
    let ignoreNext = false;
    args.some(function (arg, i2) {
      if (ignoreNext) {
        ignoreNext = false;
        return;
      }
      if (arg.startsWith("-")) {
        const parsedOption = program.options.find(option => {
          return option.long === arg || option.short === arg;
        });
        if (parsedOption === undefined) {
          return;
        }
        const optionName = parsedOption.attributeName();
        const parsedArg = opts[optionName];
        if (optionName === "require" || parsedArg && parsedArg !== true) {
          ignoreNext = true;
        }
      } else {
        i = i2;
        return true;
      }
    });
    args = args.slice(i);
    requireArgs();
    const filename = args[0];
    if (!path.isAbsolute(filename)) {
      args[0] = path.join(process.cwd(), filename);
    }
    process.argv = ["node", ...args];
    process.execArgv.push(fileURLToPath(import.meta.url));
    Module.runMain();
  } else {
    requireArgs();
    replStart();
  }
}
function requireArgs() {
  if (opts.require) {
    require$1(require$1.resolve(opts.require, {
      paths: [process.cwd()]
    }));
  }
}
function replEval(code, context, filename, callback) {
  let err;
  let result;
  try {
    if (code.startsWith("(") && code.endsWith(")")) {
      code = code.slice(1, -1);
    }
    result = _eval(code, filename);
  } catch (e) {
    err = e;
  }
  if (hasTopLevelAwait && !err) {
    result.then(v => {
      callback(null, v);
    }).catch(e => {
      callback(e, null);
    });
  } else {
    callback(err, result);
  }
}
function replStart() {
  const replServer = repl.start({
    prompt: "babel > ",
    input: process.stdin,
    output: process.stdout,
    eval: replEval,
    useGlobal: true,
    preview: true
  });
  const NODE_REPL_HISTORY = process.env.NODE_REPL_HISTORY;
  replServer.setupHistory(NODE_REPL_HISTORY, () => {});
}
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