webpack.config.js

const path = require('path');
const webpack = require('webpack');
const HTMLWebpackPlugin = require('html-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const WebpackCleanupPlugin = require('webpack-cleanup-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');

const extractTextPlugin = new ExtractTextPlugin('style.css');

module.exports = {
  entry: './src/index.js',
  output: {
    path: path.resolve('dist'),
    filename: 'index.[hash].js'
  },
  devtool: 'inline-source-map',
  devServer: {
    contentBase: path.join(__dirname, 'dist/'),
    port: 1234,
    compress: true
  },
  resolve: {
    extensions: ['.js']
  },
  plugins: [
    new HTMLWebpackPlugin({
      template: './src/index.html',
      filename: 'index.html',
      inject: 'body'
    }),
    extractTextPlugin,
    new WebpackCleanupPlugin(),
    new CopyWebpackPlugin([{
      from: 'src/static'
    }]),
    new webpack.NamedModulesPlugin(),
    new webpack.HotModuleReplacementPlugin()
  ],
  module: {
    rules: [
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/
      },
      {
        test: /.scss$/,
        use: extractTextPlugin.extract({
          fallback: 'style-loader',
          use: ['css-loader', 'sass-loader']
        })
      }
    ]
  },
  performance: {
    hints: false
  }
};