webpack.config.js

const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
  entry: ['./example/app.js', './example/app.css', './styles/scss/image-gallery.scss'],
  output: {
    path: path.resolve(__dirname, 'example'),
    filename: 'example.js',
    publicPath: '/dist/'
  },
  resolve: {
    extensions: ['.js'],
    alias: {
      src: path.resolve(__dirname, 'src/'),
    },
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        loader: 'babel-loader',
      },
      {
        test: /\.(css|scss)$/i,
        use: [
          // Creates `style` nodes from JS strings
          "style-loader",
          // Translates CSS into CommonJS
          "css-loader",
          // Compiles Sass to CSS
          "sass-loader",
        ],
      }
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: 'image-gallery.css',
    }),
  ],
  devServer: {
    host: '127.0.0.1',
    port: 3030,
    historyApiFallback: {
      rewrites: [{ from: /\//, to: '/example/index.html' }],
    },
  },
};