Why webpack bundled as 'System.register'

Question

I am trying develop a angular2 app using webpack, but it end up with an error in browser console say: Uncaught ReferenceError: System is not defined.

When I looked into the bundled js, I saw it is using System.register like below:

function(module, exports) {

    System.register(['angular2/platform/browser', './app.component'], function(exports_1) {
        var browser_1, app_component_1;
        return {
            setters:[
                function (browser_1_1) {
                    browser_1 = browser_1_1;
                },
                function (app_component_1_1) {
                    app_component_1 = app_component_1_1;
                }],
            execute: function() {
                browser_1.bootstrap(app_component_1.AppComponent);
            }
        }
    });
    // ...

My webpack.config.js is pretty simple as below:

var webpack = require('webpack');

module.exports = {
    context: __dirname,
    entry: "./app/boot.ts",
    devtool: 'inline-sourcemap',

    output: {
        path: __dirname + "/dist",
        filename: "bundle.js"
    },

    module: {
        loaders: [
            {test: /\.ts$/, loader: 'ts-loader'}
        ]

    }
};

Can anyone fix for me? thanks.

Answer 1

As suggested by @Ron

If you're using Webpack to bundle your application you must transpile your code to commonjs. The solution is to change module to commonjs in your tsconfig.json.

// tsconfig.json
"module" : "commonjs"

Here's a list of seed repositories for angular2 using webpack that can be helpful

• ng2-webpack-play by @pkozlowski-opensource
• angular2-webpack-starter by @gdi2290
• ng2-webpack by @ocombe

As an extra, I recommend you to watch Modularity and Packaging for Angular2 Applications by Pawel from AngularConnect2015