npm and error messages

node_modules/enhanced-resolve/lib/AppendPlugin.js

@@ -0,0 +1,22 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+function AppendPlugin(source, appending, target) {
+	this.source = source;
+	this.appending = appending;
+	this.target = target;
+}
+module.exports = AppendPlugin;
+
+AppendPlugin.prototype.apply = function(resolver) {
+	var target = this.target;
+	var appending = this.appending;
+	resolver.plugin(this.source, function(request, callback) {
+		var obj = Object.assign({}, request, {
+			path: request.path + appending,
+			relativePath: request.relativePath && (request.relativePath + appending)
+		});
+		resolver.doResolve(target, obj, appending, callback);
+	});
+};