All files / lib/internal/modules run_main.js

100% Statements 83/83
96.67% Branches 29/30
100% Functions 6/6
100% Lines 83/83

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 84138x 138x 138x 138x 138x 138x 138x 138x 138x 138x 138x 4447x 4447x 4447x 4447x 4447x 4447x 4447x 4430x 4430x 4430x 4430x 4430x 4430x 4447x 138x 4447x 4447x 4447x 4447x 4427x 4427x 4427x 4427x 4417x 4447x 4447x 4447x 4447x 4314x 4447x 4447x 138x 117x 117x 117x 117x 114x 114x 114x 117x 117x 138x 136x 136x 136x 136x 136x 39x 39x 39x 136x 136x 136x 138x 138x 138x 138x 4447x 4447x 4447x 4447x 117x 4447x 4330x 4330x 4330x 4447x 138x 138x 138x 138x 138x  
'use strict';
 
const {
  PromisePrototypeFinally,
  StringPrototypeEndsWith,
} = primordials;
const CJSLoader = require('internal/modules/cjs/loader');
const { Module, toRealPath, readPackageScope } = CJSLoader;
const { getOptionValue } = require('internal/options');
const path = require('path');
 
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) {
  const userLoader = getOptionValue('--experimental-loader');
  if (userLoader)
    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 esmLoader = require('internal/process/esm_loader');
  const { pathToFileURL } = require('internal/url');
  handleMainPromise(esmLoader.loadESM((ESMLoader) => {
    const main = path.isAbsolute(mainPath) ?
      pathToFileURL(mainPath).href : mainPath;
    return ESMLoader.import(main);
  }));
}
 
function handleMainPromise(promise) {
  // Handle a Promise from running code that potentially does Top-Level Await.
  // In that case, it makes sense to set the exit code to a specific non-zero
  // value if the main code never finishes running.
  function handler() {
    if (process.exitCode === undefined)
      process.exitCode = 13;
  }
  process.on('exit', handler);
  return PromisePrototypeFinally(promise, () => process.off('exit', handler));
}
 
// 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,
};