module: remove useCustomLoadersIfPresent flag

The flag is always true and can be determined by isLoaderWorker solely.
PR-URL: #48655
Backport-PR-URL: #51239
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

Author: legendecas

lib/internal/modules/esm/loader.js

@@ -524,15 +524,13 @@ let emittedLoaderFlagWarning = false;
  * A loader instance is used as the main entry point for loading ES modules. Currently, this is a singleton; there is
  * only one used for loading the main module and everything in its dependency graph, though separate instances of this
  * class might be instantiated as part of bootstrap for other purposes.
- * @param {boolean} useCustomLoadersIfPresent If the user has provided loaders via the --loader flag, use them.
  * @returns {ModuleLoader}
  */
-functioncreateModuleLoader(useCustomLoadersIfPresent=true){
+functioncreateModuleLoader(){
 letcustomizations=null;
-if(useCustomLoadersIfPresent&&
-// Don't spawn a new worker if we're already in a worker thread created by instantiating CustomizedModuleLoader;
-// doing so would cause an infinite loop.
-!require('internal/modules/esm/utils').isLoaderWorker()){
+// Don't spawn a new worker if we're already in a worker thread created by instantiating CustomizedModuleLoader;
+// doing so would cause an infinite loop.
+if(!require('internal/modules/esm/utils').isLoaderWorker()){
 constuserLoaderPaths=getOptionValue('--experimental-loader');
 if(userLoaderPaths.length>0){
 if(!emittedLoaderFlagWarning){

lib/internal/process/esm_loader.js

@@ -11,10 +11,10 @@ let esmLoader;
 
 module.exports={
 getesmLoader(){
-returnesmLoader??=createModuleLoader(true);
+returnesmLoader??=createModuleLoader();
 },
 asyncloadESM(callback){
-esmLoader??=createModuleLoader(true);
+esmLoader??=createModuleLoader();
 try{
 constuserImports=getOptionValue('--import');
 if(userImports.length>0){