webpack.dev.config.js

const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const HardSourceWebpackPlugin = require('hard-source-webpack-plugin');

const GLOBALS = {
  'process.env.NODE_ENV': JSON.stringify('dev'),
  'process.env.BUILD_ENV': JSON.stringify(process.env.BUILD_ENV),
  __DEV__: true,
};

module.exports = {
  resolve: {
    extensions: ['.js', '.jsx', '.json'],
  },
  devtool: 'cheap-module-eval-source-map',
  entry: [
    './src/webpack-public-path',
    'react-hot-loader/patch',
    'webpack-hot-middleware/client?reload=true',
    path.resolve(__dirname, 'src/index'),
  ],
  target: 'web',
  mode: 'development',
  output: {
    path: path.resolve(__dirname, 'dist'),
    publicPath: '/',
    filename: 'bundle.js',
  },
  watch: true,
  watchOptions: {
    ignored: /node_modules/,
    aggregateTimeout: 500,
    poll: 1000,
  },
  module: {
    rules: [
      {
        test: /\.js|.jsx$/,
        exclude: /(node_modules|bower_components)/,
        loader: 'babel-loader',
      },
      {test: /\.css$/, use: ['style-loader', 'css-loader']},
      {test: /\.less$/, use: ['style-loader', 'css-loader', 'less-loader', 'postcss-loader']},
      {
        test: /\.(jpe?g|png|gif|ico)$/i,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: '[name].[ext]',
            },
          },
        ],
      },
    ],
  },
  plugins: [
    new HardSourceWebpackPlugin(),
    new webpack.DefinePlugin(GLOBALS),
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoEmitOnErrorsPlugin(),
    new HtmlWebpackPlugin({
      template: './src/index.ejs',
      minify: {
        removeComments: true,
        collapseWhitespace: true,
      },
      inject: true
    }),
  ],
};