All files / lib/internal/process esm_loader.js

94.79% Statements 91/96
85.71% Branches 12/14
100% Functions 4/4
94.79% Lines 91/96

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 97137x 137x 137x 137x 137x 137x 137x 137x 137x 137x 137x 137x 137x 137x 137x 137x 137x 137x 137x 152x 152x 152x 152x 151x 151x 152x 137x 137x 137x 367x 367x 367x 367x 367x 366x 366x 366x 367x 367x 137x 137x 137x 137x 137x 137x 137x 137x 137x 137x 208x 208x 208x 208x 208x 208x 208x 208x 208x 208x 208x 208x     208x 208x 208x 208x 208x 208x 208x 208x 208x 208x 208x 208x 208x 208x 208x 208x 208x 137x 137x 208x 208x 208x 208x 33x       33x 33x 33x 33x 33x 137x  
'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;
 
  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 */
    );
  }
};