All files / lib/internal/modules run_main.js

100% Statements 88/88
96.67% Branches 29/30
100% Functions 6/6
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 89140x 140x 140x 140x 140x 140x 140x 140x 140x 140x 4719x 4719x 4719x 4719x 4719x 4719x 4719x 4702x 4702x 4702x 4702x 4702x 4702x 4719x 140x 4719x 4719x 4719x 4719x 4701x 4701x 4701x 4701x 4691x 4719x 4719x 4719x 4719x 4581x 4719x 4719x 140x 122x 122x 122x 122x 122x 119x 119x 119x 119x 122x 122x 140x 141x 141x 141x 141x 141x 42x 42x 42x 141x 141x 141x 141x 99x 99x 141x 140x 140x 140x 140x 4719x 4719x 4719x 4719x 122x 4719x 4597x 4597x 4597x 4719x 140x 140x 140x 140x 140x  
'use strict';
 
const {
  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 { 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);
  }));
}
 
async 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);
  try {
    return await promise;
  } finally {
    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,
};