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I get an error similar to: Angular2 + webpack Uncaught ReferenceError: System is not defined

...or

Angular 2 with webpack - Uncaught ReferenceError: System is not defined

I am using latest npm package.json settings from:

http://angular.io/docs/ts/latest/guide/npm-packages.html

I did not find any solutions for this issue. I am using ASP.NET local IIS server. Project starts on Visual Studio Commutity 2015.

webpack.common.js:

var webpack = require('webpack');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var path = require('path');
var ProvidePlugin = require('webpack/lib/ProvidePlugin'); 

module.exports = {
    devtool: 'cheap-module-source-map',
    cache: true,
    debug: true,

    entry: {
        'polyfills': './polyfills.ts',
        'vendor': './vendor.ts',
        'main': './main.ts',
    },

    plugins: [
        new webpack.optimize.OccurenceOrderPlugin(true),
        new webpack.optimize.CommonsChunkPlugin({
            name: ['main', 'vendor', 'polyfills'],
            minChunks: Infinity
        }),
        new ProvidePlugin({
            jQuery: 'jquery',
            $: 'jquery',
            jquery: 'jquery'
        })
    ],

    module: {
        loaders: [
            { test: /\.ts$/, loaders: ['awesome-typescript-loader', 'angular2-template-loader'] },
            { test: /\.css$/, loaders: ['to-string-loader', 'css-loader'] },
            { test: /\.less$/, loader: 'raw-loader!less-loader' },
            { test: /\.html$/, loader: 'raw-loader' },
            { test: /\.(png|jpe?g|gif|svg|woff|woff2|ttf|eot|ico)$/, loader: 'file?name=assets/[name].[hash].[ext]' }
        ]
    },

    output: {
        publicPath: '/',
        filename: '[name].js',
        sourceMapFilename: '[name].map',
        chunkFilename: '[id].js'
    },

    htmlLoader: {
        minimize: false
    },

    devServer: {
        contentBase: '.',
        host: 'localhost',
        potr: 44305
    },

    resolve: {
        extensions: ['', '.ts', '.js', '.css', '.less']
    },

    node: {
        global: 1,
        crypto: 'empty',
        module: 0,
        Buffer: 0,
        clearImmediate: 0,
        setImmediate: 0
    }
};

webpack.config.js:

var webpack = require('webpack');
var path = require('path');
var webpackMerge = require('webpack-merge');
var commonConfig = require('./webpack.common.js');

// Webpack Config
var webpackConfig = {

    output: {
        filename: '[name].js'
    }

};

module.exports = webpackMerge(commonConfig, webpackConfig);
tsconfig.json:

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "rootDir": ".",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": true,
    "suppressImplicitAnyIndexErrors": true
  },
  "exclude": [
    "node_modules"
  ],
  "awesomeTypescriptLoaderOptions": {
    "useWebpackText": true
  },
  "compileOnSave": true,
  "buildOnSave": false,
  "atom": {
    "rewriteTsconfig": false 
  }
}

vendors.ts:

import '@angular/platform-browser';
import '@angular/platform-browser-dynamic';
import '@angular/core';
import '@angular/common';
import '@angular/http';
import '@angular/router';

import 'rxjs/Rx';

import 'jquery/dist/jquery';
import 'bootstrap/dist/js/bootstrap';
import 'angular2-notifications/components.js';
import 'moment';
import 'eonasdan-bootstrap-datetimepicker/src/js/bootstrap-datetimepicker.js';

polyfills.ts:

import 'core-js/es6';
import 'core-js/es7/reflect';

require('zone.js/dist/zone');
require('zone.js/dist/long-stack-trace-zone');

Chrome console:

core.umd.js:3468Error: Uncaught (in promise): ReferenceError: System is not defined
    at resolvePromise (https://localhost:44305/polyfills.js:7687:32)
    at https://localhost:44305/polyfills.js:7664:14
    at ZoneDelegate.invoke (https://localhost:44305/polyfills.js:7461:29)
    at Object.onInvoke (https://localhost:44305/vendor.js:6786:42)
    at ZoneDelegate.invoke (https://localhost:44305/polyfills.js:7460:35)
    at Zone.run (https://localhost:44305/polyfills.js:7354:44)
    at https://localhost:44305/polyfills.js:7720:58
    at ZoneDelegate.invokeTask (https://localhost:44305/polyfills.js:7494:38)
    at Object.onInvokeTask (https://localhost:44305/vendor.js:6777:42)
    at ZoneDelegate.invokeTask (https://localhost:44305/polyfills.js:7493:43)
1
  • did you have any luck fixing this one. I have the same issue? Commented Oct 15, 2016 at 22:53

1 Answer 1

1

Like you, I followed the Angular 2 guide I expected my application to build and run successfully with Webpack instead of SystemJS. Yeah, right! For me, it turned out to be caused by lazy loaded modules.

If you specify 'loadChildren' in any of your route definitions, Angular 2 defaults to using the SystemJS module loader to retrieve the module. Unless you provide another loader (see https://angular.io/docs/ts/latest/guide/router.html#!#asynchronous-routing)

Solution: Install a lazy loader for Webpack

  • Install npm package 'angular2-router-loader' as a dev. dependency
  • Add 'angular2-router-loader' to the TypeScript loaders in webpack config
  • You may have to specify paths in 'loadChildren' with a leading './' (opposed to absolute or 'implicitly relative')
  • Build, run and jump with joy when it finally works

Source: https://medium.com/@daviddentoom/angular-2-lazy-loading-with-webpack-d25fe71c29c1#.lmd8lnkos

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1 Comment

Great answer. You rule.

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