webpack.common.js

const path = require('path');
const SRC_DIR = path.join(__dirname, '/client/src');
const DIST_DIR = path.join(__dirname, '/public/dist');
const webpack = require('webpack');

module.exports = {
  context: __dirname,
  output: {
    path: DIST_DIR,
    publicPath: '/',
    filename: 'bundle.js'
  },
  devtool: '#source-map',
  // plugins: [new webpack.HotModuleReplacementPlugin() /* , new webpack.NoEmitOnErrorsPlugin() */],
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        include: SRC_DIR,
        loader: require.resolve('babel-loader'),
        options: {
          cacheDirectory: true,
          plugins: ['react-hot-loader/babel']
        }
      },
      {
        test: /\.jsx?/,
        include: SRC_DIR,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env', '@babel/preset-react'],
            plugins: ['react-hot-loader/babel']
          }
        }
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader']
      },
      {
        test: /\.(scss)$/,
        use: [
          {
            loader: 'style-loader' // inject CSS to page
          },
          {
            loader: 'css-loader' // translates CSS into CommonJS modules
          },
          {
            loader: 'postcss-loader', // Run post css actions
            options: {
              plugins: function() {
                // post css plugins, can be exported to postcss.config.js
                return [require('precss'), require('autoprefixer')];
              }
            }
          },
          {
            loader: 'sass-loader' // compiles Sass to CSS
          }
        ]
      },
      {
        test: /\.svg$/,
        loader: 'svg-inline-loader'
      }
    ]
  }
};