webpack.common.js

const path = require('path')
const { CleanWebpackPlugin } = require('clean-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const CopyPlugin = require('copy-webpack-plugin')

const devMode = process.env.NODE_ENV !== 'production'
const htmlConfig = {
  title: 'Webpack Boilerplate',
  template: './src/index.html'
}

const cssConfig = {
  filename: devMode ? 'style.css' : 'style.[hash].css'
}

module.exports = {
  entry: './src/app/index.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    publicPath: ''
  },
  plugins: [
    new CleanWebpackPlugin(), // Cleans the dist folder before every build
    new HtmlWebpackPlugin(htmlConfig),
    new CopyPlugin([
      { from: './src/assets/images', to: 'assets/images' }
    ]),
    new MiniCssExtractPlugin(cssConfig),
  ],
  module: {
    rules: [
      {
        test: /\.(sc|c)ss$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
            options: {
              hmr: devMode
            }
          },
          'css-loader',
          {
            loader: 'postcss-loader',
            options: {
              plugins: [
                require('autoprefixer'),
                require('cssnano')({ preset: 'default' })
              ]
            }
          },
          'sass-loader'
        ]
      },
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader'
        }
      },
      {
        test: /\.(woff|woff2|eot|ttf|otf)$/,
        loader: 'file-loader',
        options: {
          name: '[name].[ext]?[hash]',
          outputPath: 'assets/fonts'
        }
      },
      {
        test: /\.(png|svg|jpg|gif)$/,
        loader: 'file-loader',
        options: {
          name: '[name].[ext]?[hash]',
          outputPath: 'assets/images'
        }
      }
    ]
  }
}