Code Splitting ~ ReferenceError: System is not defined - reactjs

Question

My code hit the error
ReferenceError: System is not defined
In line
<IndexRoute getComponent={(nextState, cb) => System.import('./containers/Home').then(module => cb(null, module))} />
How do I define System. Is it related to my webpack settings? Here how I put it
var path = require('path');
var webpack = require('webpack');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var stylus = require('stylus');
module.exports = {
debug: true,
devtool: 'eval',
entry: {
"vendor": ["react", "react-router", 'react-dom'],
"app": ['webpack-dev-server/client?http://localhost:3000', 'webpack/hot/only-dev-server', './app/App.js']
},
output: {
pathinfo: true,
path: path.resolve(__dirname, 'public'),
filename: '[name].js',
publicPath: 'http://localhost:3000/'
},
plugins: [
new HtmlWebpackPlugin({
title: 'Welcome!',
template: './index_template.ejs',
inject: 'body'
}),
new webpack.HotModuleReplacementPlugin(),
new webpack.optimize.UglifyJsPlugin({
output: {
comments: false
},
compress: {
warnings: false
}
}),
new webpack.optimize.CommonsChunkPlugin({
name: 'vendor',
minChunks: Infinity,
filename: 'vendor.bundle.js'
})
],
module: {
loaders: [
{
test: /\.js$/,
exclude: /(node_modules|bower_components)/,
loaders: ['react-hot', 'babel']
},
{
test: /\.styl$/,
exclude: /(node_modules|bower_components)/,
// loader: 'style!css?resolve url?sourceMap&modules&importLoaders=1&localIdentName=[name]__[local]__[hash:base64:5]!postcss!stylus-loader'
loader: 'style!css?sourceMap&modules&importLoaders=1&localIdentName=[name]__[local]__[hash:base64:5]!postcss!stylus-loader'
},
{
test: /\.(png|jpg)$/,
exclude: /(node_modules|bower_components)/,
loader: 'url-loader?name=images/[name].[ext]&limit=8192'
},
{
test: /\.(ttf|otf|eot)$/,
exclude: /(node_modules|bower_components)/,
loader: 'url-loader?name=fonts/[name].[ext]&limit=8192'
},
{
test: /\.css$/,
loader: 'style!css-loader?modules&importLoaders=1&localIdentName=[name]__[local]___[hash:base64:5]'
},
{
test: /\.scss$/,
loader: 'style!css-loader?modules&importLoaders=1&localIdentName=[name]__[local]___[hash:base64:5]!postcss!sass?resolve url'
},
{
test: /\.json$/,
loader: 'json-loader'
},
{
test: /\.js$/,
include: path.resolve('node_modules/mapbox-gl-shaders/index.js'),
loader: 'transform/cacheable?brfs'
}
]
},
resolve: {
root: path.join(__dirname, '..', 'app'),
alias: {
'react': path.join(__dirname, 'node_modules', 'react')
},
extensions: ['', '.js', '.jsx', '.json', '.css', '.styl', '.png', '.jpg', '.jpeg', '.gif']
},
stylus: {
'resolve url': true
},
postcss: function () {
return [autoprefixer];
}
};
(Disclaimer: I am new to React-Router and webpack, so this may be
obvious to someone with more familiarity)

Answer 1

Your webpack build stack probably doesn't have configured System.import. I suppose that you use webpack 1 and support of System.import will be only in webpack 2.
You can change your existing code to current popular code splitting solution:
<IndexRoute
getComponent={(nextState, cb) => {
require.ensure([], require => {
// default import is not supported in CommonJS standard
cb(null, require('./containers/Home').default)
});
}}
/>
Note that you must specify .default if you want to use default import in CommonJS standard.