webpack.config.js

const webpack = require('webpack');
const path = require('path');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
var ChunkManifestPlugin = require('chunk-manifest-webpack-plugin');

module.exports = {
    entry: [
        path.resolve('src', 'app.js')
    ],
    output: {
        filename: '[name].js',
        path: path.resolve('dist')
    },
    devtool: 'source-map',
    module: {
        loaders: [],
        rules: [{
            test: /\.css$/,
            use: ExtractTextPlugin.extract({
                fallback: 'style-loader',
                use: ['css-loader', 'postcss-loader']
            })
        }, {
            test: /\.(js|jsx)$/,
            exclude: /node_modules/,
            loader: 'babel-loader',
            query: {
                presets: ['react', 'es2015', 'react-hmre']
            }
        }, {
            test: /\.(png|jpg|jpeg|gif|svg|woff|woff2|ttf|eot)(\?v=[0-9]\.[0-9]\.[0-9])?$/,
            loader: 'url-loader',
            query: {
                limit: 25000
            }
        }]
    },
    externals: {
        BitGo: 'BitGoJS'
    },
    plugins: [
        new ExtractTextPlugin('styles.css'),
        new webpack.optimize.CommonsChunkPlugin({
            names: ['vendor', 'manifest']
        }),
        new HtmlWebpackPlugin({
            template: 'index.html',
            inject: 'body'
        }),
        new ChunkManifestPlugin({
            filename: 'manifest.json',
            manifestVariable: 'webpackManifest'
        })
    ]
};