Method register

lib/internal/modules/esm/hooks.js:173–183

* Import and register custom/user-defined module loader hook(s). * @param {string} urlOrSpecifier * @param {string} parentURL * @param {any} [data] Arbitrary data to be passed from the custom * loader (user-land) to the worker.

(urlOrSpecifier, parentURL, data, isInternal)

   *   loader (user-land) to the worker.
   */
  async register(urlOrSpecifier, parentURL, data, isInternal) {
    const cascadedLoader = require('internal/modules/esm/loader').getOrInitializeCascadedLoader();
    const keyedExports = isInternal ?
      require(urlOrSpecifier) :
      await cascadedLoader.import(
        urlOrSpecifier,
        parentURL,
        kEmptyObject,
      );
    await this.addCustomLoader(urlOrSpecifier, keyedExports, data);
  }

  /**
   * Collect custom/user-defined module loader hook(s).