All files / lib/internal/modules run_main.js

100% Statements 88/88
96.42% Branches 27/28
100% Functions 5/5
100% Lines 88/88

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89148x 148x 148x 148x 148x 148x 148x 148x 148x 148x 148x 148x 148x 148x 5524x 5524x 5524x 5524x 5524x 5524x 5524x 5507x 5507x 5507x 5507x 5507x 5507x 5524x 148x 5524x 5524x 5524x 5524x 5524x 5524x 5524x 5524x 5501x 5501x 5501x 5501x 5490x 5524x 5524x 5524x 5524x 5341x 5524x 5524x 148x 166x 166x 166x 166x 166x 164x 164x 164x 166x 166x 148x 217x 217x 217x 217x 217x 161x 161x 217x 148x 148x 148x 148x 5524x 5524x 5524x 5524x 166x 5524x 5358x 5358x 5358x 5524x 148x 148x 148x 148x 148x  
'use strict';
 
const {
  ObjectCreate,
  StringPrototypeEndsWith,
} = primordials;
const CJSLoader = require('internal/modules/cjs/loader');
const { Module, toRealPath, readPackageScope } = CJSLoader;
const { getOptionValue } = require('internal/options');
const path = require('path');
const {
  handleProcessExit,
} = require('internal/modules/esm/handle_process_exit');
 
function resolveMainPath(main) {
  // Note extension resolution for the main entry point can be deprecated in a
  // future major.
  // Module._findPath is monkey-patchable here.
  let mainPath = Module._findPath(path.resolve(main), null, true);
  if (!mainPath)
    return;
 
  const preserveSymlinksMain = getOptionValue('--preserve-symlinks-main');
  if (!preserveSymlinksMain)
    mainPath = toRealPath(mainPath);
 
  return mainPath;
}
 
function shouldUseESMLoader(mainPath) {
  /**
   * @type {string[]} userLoaders A list of custom loaders registered by the user
   * (or an empty list when none have been registered).
   */
  const userLoaders = getOptionValue('--experimental-loader');
  if (userLoaders.length > 0)
    return true;
  const esModuleSpecifierResolution =
    getOptionValue('--experimental-specifier-resolution');
  if (esModuleSpecifierResolution === 'node')
    return true;
  // Determine the module format of the main
  if (mainPath && StringPrototypeEndsWith(mainPath, '.mjs'))
    return true;
  if (!mainPath || StringPrototypeEndsWith(mainPath, '.cjs'))
    return false;
  const pkg = readPackageScope(mainPath);
  return pkg && pkg.data.type === 'module';
}
 
function runMainESM(mainPath) {
  const { loadESM } = require('internal/process/esm_loader');
  const { pathToFileURL } = require('internal/url');
 
  handleMainPromise(loadESM((esmLoader) => {
    const main = path.isAbsolute(mainPath) ?
      pathToFileURL(mainPath).href : mainPath;
    return esmLoader.import(main, undefined, ObjectCreate(null));
  }));
}
 
async function handleMainPromise(promise) {
  process.on('exit', handleProcessExit);
  try {
    return await promise;
  } finally {
    process.off('exit', handleProcessExit);
  }
}
 
// For backwards compatibility, we have to run a bunch of
// monkey-patchable code that belongs to the CJS loader (exposed by
// `require('module')`) even when the entry point is ESM.
function executeUserEntryPoint(main = process.argv[1]) {
  const resolvedMain = resolveMainPath(main);
  const useESMLoader = shouldUseESMLoader(resolvedMain);
  if (useESMLoader) {
    runMainESM(resolvedMain || main);
  } else {
    // Module._load is the monkey-patchable CJS module loader.
    Module._load(main, null, true);
  }
}
 
module.exports = {
  executeUserEntryPoint,
  handleMainPromise,
};