npm and error messages

node_modules/webpack/lib/ExternalsPlugin.js

@@ -0,0 +1,21 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+const ExternalModuleFactoryPlugin = require("./ExternalModuleFactoryPlugin");
+
+class ExternalsPlugin {
+	constructor(type, externals) {
+		this.type = type;
+		this.externals = externals;
+	}
+	apply(compiler) {
+		compiler.plugin("compile", (params) => {
+			params.normalModuleFactory.apply(new ExternalModuleFactoryPlugin(this.type, this.externals));
+		});
+	}
+}
+
+module.exports = ExternalsPlugin;