All files / lib/internal/process esm_loader.js

94.94% Statements 94/99
86.66% Branches 13/15
100% Functions 4/4
94.94% Lines 94/99

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 89 90 91 92 93 94 95 96 97 98 99 100135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 150x 150x 150x 150x 149x 149x 150x 135x 135x 135x 364x 364x 364x 364x 364x 363x 363x 363x 364x 1x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 202x 202x 202x 202x 202x 202x 202x 202x 202x 202x 202x 202x 202x 202x 202x     202x 202x 202x 202x 202x 202x 202x 202x 202x 202x 202x 202x 202x 202x 202x 202x 202x 135x 135x 202x 202x 202x 202x 35x       35x 35x 35x 35x 35x 135x  
'use strict';
 
const {
  ObjectCreate,
} = primordials;
 
const {
  ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING,
} = require('internal/errors').codes;
const { ESMLoader } = require('internal/modules/esm/loader');
const {
  hasUncaughtExceptionCaptureCallback,
} = require('internal/process/execution');
const { pathToFileURL } = require('internal/url');
const {
  getModuleFromWrap,
} = require('internal/vm/module');
 
exports.initializeImportMetaObject = function(wrap, meta) {
  const { callbackMap } = internalBinding('module_wrap');
  if (callbackMap.has(wrap)) {
    const { initializeImportMeta } = callbackMap.get(wrap);
    if (initializeImportMeta !== undefined) {
      initializeImportMeta(meta, getModuleFromWrap(wrap) || wrap);
    }
  }
};
 
exports.importModuleDynamicallyCallback =
async function importModuleDynamicallyCallback(wrap, specifier, assertions) {
  const { callbackMap } = internalBinding('module_wrap');
  if (callbackMap.has(wrap)) {
    const { importModuleDynamically } = callbackMap.get(wrap);
    if (importModuleDynamically !== undefined) {
      return importModuleDynamically(
        specifier, getModuleFromWrap(wrap) || wrap, assertions);
    }
  }
  throw new ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING();
};
 
const esmLoader = new ESMLoader();
 
exports.esmLoader = esmLoader;
 
/**
 * Causes side-effects: user-defined loader hooks are added to esmLoader.
 * @returns {void}
 */
async function initializeLoader() {
  const { getOptionValue } = require('internal/options');
  // customLoaders CURRENTLY can be only 1 (a string)
  // Once chaining is implemented, it will be string[]
  const customLoaders = getOptionValue('--experimental-loader');
 
  if (!customLoaders.length) return;
 
  const { emitExperimentalWarning } = require('internal/util');
  emitExperimentalWarning('--experimental-loader');
 
  let cwd;
  try {
    cwd = process.cwd() + '/';
  } catch {
    cwd = 'file:///';
  }
 
  // A separate loader instance is necessary to avoid cross-contamination
  // between internal Node.js and userland. For example, a module with internal
  // state (such as a counter) should be independent.
  const internalEsmLoader = new ESMLoader();
 
  // Importation must be handled by internal loader to avoid poluting userland
  const exports = await internalEsmLoader.import(
    customLoaders,
    pathToFileURL(cwd).href,
    ObjectCreate(null),
  );
 
  // Hooks must then be added to external/public loader
  // (so they're triggered in userland)
  await esmLoader.addCustomLoaders(exports);
}
 
exports.loadESM = async function loadESM(callback) {
  try {
    await initializeLoader();
    await callback(esmLoader);
  } catch (err) {
    if (hasUncaughtExceptionCaptureCallback()) {
      process._fatalException(err);
      return;
    }
    internalBinding('errors').triggerUncaughtException(
      err,
      true /* fromPromise */
    );
  }
};