esm,loader: create parentURL from the main thread

Create the parentURL from the main thread to get the user dirname where
the application will be running. With this implementation the user can
register loaders using partial imports "./...", "../...".

Author: jlenon7

lib/internal/modules/esm/hooks.js

@@ -49,7 +49,6 @@ const {
 } = require('internal/validators');
 
 const { kEmptyObject } = require('internal/util');
-const { pathToFileURL } = require('internal/url');
 
 const {
   defaultResolve,
@@ -128,18 +127,16 @@ class Hooks {
    * Import and register custom/user-defined module loader hook(s).
    * @param {string} urlOrSpecifier
    */
-  async registerLoader(urlOrSpecifier) {
+  async registerLoader(urlOrSpecifier, parentURL) {
     const { DefaultModuleLoader } = require('internal/modules/esm/loader')
 
     const moduleLoader = new DefaultModuleLoader();
-    const parentURL = pathToFileURL(process.cwd() + '/').href;
     const keyedExportsSublist = await moduleLoader.import(
       [urlOrSpecifier],
       parentURL,
       kEmptyObject,
     );
 
-
     this.addCustomLoaders(keyedExportsSublist);
   }
 

lib/internal/modules/esm/register.js

@@ -1,5 +1,7 @@
 'use strict';
 
+const { dirname } = require('path');
+const { pathToFileURL } = require('internal/url');
 const { getHooksProxy } = require('internal/modules/esm/loader');
 
 /**
@@ -14,8 +16,9 @@ const { getHooksProxy } = require('internal/modules/esm/loader');
  */
 async function registerLoader(urlOrSpecifier) {
   const hooksProxy = getHooksProxy();
+  const parentURL = pathToFileURL(dirname(process.argv[1]) + '/').href
 
-  await hooksProxy.makeAsyncRequest('registerLoader', urlOrSpecifier)
+  await hooksProxy.makeAsyncRequest('registerLoader', urlOrSpecifier, parentURL)
 }
 
 module.exports = {