Function initializeModuleLoaders

lib/internal/process/pre_execution.js:220–250

(options)

}

function initializeModuleLoaders(options) {
  const { shouldSpawnLoaderHookWorker, shouldPreloadModules } = options;
  // Initialize certain special module.Module properties and the CJS conditions.
  const { initializeCJS } = require('internal/modules/cjs/loader');
  initializeCJS();
  // Initialize the ESM loader and a few module callbacks.
  // If shouldSpawnLoaderHookWorker is true, later when the ESM loader is instantiated on-demand,
  // it will spawn a loader worker thread to handle async custom loader hooks.
  const { initializeESM } = require('internal/modules/esm/utils');
  initializeESM(shouldSpawnLoaderHookWorker);

  const {
    hasStartedUserCJSExecution,
    hasStartedUserESMExecution,
  } = require('internal/modules/helpers');
  // At this point, no user module has been executed yet.
  assert(!hasStartedUserCJSExecution());
  assert(!hasStartedUserESMExecution());

  if (getEmbedderOptions().hasEmbedderPreload) {
    runEmbedderPreload();
  }
  // Do not enable preload modules if custom loaders are disabled.
  // For example, loader workers are responsible for doing this themselves.
  // And preload modules are not supported in ShadowRealm as well.
  if (shouldPreloadModules) {
    loadPreloadModules();
  }
  // Need to be done after --require setup.
  initializeFrozenIntrinsics();
}

function refreshRuntimeOptions() {
  refreshOptions();