Add .mjs to default DelegatedModule options.extensions

declarations.d.ts

@@ -7,7 +7,6 @@ declare namespace NodeJS {
 	}
 }
 
-
 declare module "neo-async" {
 	export interface Dictionary<T> {
 		[key: string]: T;

lib/DelegatedModuleFactoryPlugin.js

@@ -15,7 +15,13 @@ class DelegatedModuleFactoryPlugin {
 	constructor(options) {
 		this.options = options;
 		options.type = options.type || "require";
-		options.extensions = options.extensions || ["", ".js"];
+		options.extensions = options.extensions || [
+			"",
+			".wasm",
+			".mjs",
+			".js",
+			".json"
+		];
 	}
 
 	apply(normalModuleFactory) {