npm and error messages

node_modules/webpack/lib/dependencies/UnsupportedDependency.js

@@ -0,0 +1,23 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+const NullDependency = require("./NullDependency");
+const webpackMissingModule = require("./WebpackMissingModule").module;
+
+class UnsupportedDependency extends NullDependency {
+	constructor(request, range) {
+		super();
+		this.request = request;
+		this.range = range;
+	}
+}
+
+UnsupportedDependency.Template = class UnsupportedDependencyTemplate {
+	apply(dep, source, outputOptions, requestShortener) {
+		source.replace(dep.range[0], dep.range[1], webpackMissingModule(dep.request));
+	}
+};
+
+module.exports = UnsupportedDependency;