webpack.dev.config.js

const webpack = require('webpack');
const FriendlyErrorsPlugin = require('friendly-errors-webpack-plugin');
let merge = require('webpack-merge');
let baseWebpackConfig = require('./webpack.config');

// add hot-reload related code to entry chunks
Object.keys(baseWebpackConfig.entry).forEach(function (name) {
    baseWebpackConfig.entry[name] = ['./tool/dev-client'].concat(baseWebpackConfig.entry[name]);
});

/**
 * dev config
 *
 * @type {Object}
 */

module.exports = merge(baseWebpackConfig, {
    // cheap-module-eval-source-map is faster for development
    devtool: '#cheap-module-eval-source-map',
    plugins: [
        new webpack.DefinePlugin({
            'process.env': {
                'NODE_ENV': '"dev"'
            }
        }),
        // https://github.com/glenjamin/webpack-hot-middleware#installation--usage
        new webpack.HotModuleReplacementPlugin(),
        new webpack.NoEmitOnErrorsPlugin(),
        // https://github.com/ampedandwired/html-webpack-plugin
        new FriendlyErrorsPlugin()
    ]
});