Function getOrInitializeCascadedLoader

lib/internal/modules/esm/loader.js:955–967

* This is a singleton ESM loader that integrates the loader hooks, if any. * It it used by other internal built-ins when they need to load user-land ESM code * while also respecting hooks. * When built-ins need access to this loader, they should do * require('internal/module/esm/loader').getOrIn

(asyncLoaderHooks)

 * @returns {ModuleLoader}
 */
function getOrInitializeCascadedLoader(asyncLoaderHooks) {
  if (!cascadedLoader) {
    cascadedLoader = createModuleLoader(asyncLoaderHooks);
    // import.meta.resolve is not allowed in the async loader hook worker thread.
    // So only set up the import.meta.resolve initializer when we are initializing
    // the non-loader-hook-thread cascaded loader. When the native land doesn't see it,
    // it knows the loader is running on the loader hook thread.
    if (!(asyncLoaderHooks?.isForAsyncLoaderHookWorker)) {
      setImportMetaResolveInitializer(createImportMetaResolve.bind(null, cascadedLoader));
    }
  }
  return cascadedLoader;
}

function isCascadedLoaderInitialized() {
  return cascadedLoader !== undefined;