Function createImportMetaResolve

lib/internal/modules/esm/loader.js:910–940

* This is only called from the native ImportMetaObjectInitialize function to set up import.meta.resolve * when import.meta.resolve is accessed for the first time in a module. * @param {ModuleLoader} loader The cascaded loader to use. Bound when this function gets passed to native land. * @param {

(loader, moduleURL)

 * @returns {function(string, URL['href']=): string} The import.meta.resolve function
 */
function createImportMetaResolve(loader, moduleURL) {
  /**
   * @param {string} specifier The module specifier to resolve.
   * @param {URL['href']} [parentURL] Optional parent URL to resolve against. Ignored unless
   *   `--experimental-import-meta-resolve` is enabled.
   * @returns {string}
   */
  return function resolve(specifier, parentURL) {
    // The second argument is ignored unless --experimental-import-meta-resolve is enabled.
    // Even then, if it's not provided, parentURL defaults to the url of the module accessing
    // import.meta.resolve.
    allowImportMetaResolveParentURL ??= getOptionValue('--experimental-import-meta-resolve');
    parentURL = allowImportMetaResolveParentURL ? (parentURL ?? moduleURL) : moduleURL;

    let url;
    try {
      ({ url } = loader.resolveSync(parentURL, { specifier, __proto__: null }));
      return url;
    } catch (error) {
      switch (error?.code) {
        case 'ERR_UNSUPPORTED_DIR_IMPORT':
        case 'ERR_MODULE_NOT_FOUND':
          ({ url } = error);
          if (url) {
            return url;
          }
      }
      throw error;
    }
  };
}

let cascadedLoader;
/**