webpack.config.js

const path = require('path');
const webpack = require('webpack');
const FlowWebpackPlugin = require('flow-webpack-plugin');

module.exports = {
    devtool: 'source-map',
    entry: [
        'react-hot-loader/patch',
        'webpack-dev-server/client?http://localhost:3000',
        'webpack/hot/only-dev-server',
        './app/index'
    ],
    mode: 'development',
    output: {
        filename: 'bundle.js',
        path: path.resolve(__dirname, 'dist'),
        publicPath: '/'
    },
    module: {
        rules: [
            {
                test: /\.jsx?$/,
                resolve: { extensions: ['.js', '.jsx'] },
                use: ['babel-loader'],
                exclude: /node_modules/
            }
        ]
    },

    plugins: [
        new webpack.HotModuleReplacementPlugin(),
        new webpack.NamedModulesPlugin(),
        new webpack.NoEmitOnErrorsPlugin(),
        new FlowWebpackPlugin()
    ],

    devServer: {
        host: 'localhost',
        port: 3000,
        historyApiFallback: true,
        hot: true,
    },
    target: 'electron-renderer'
};