webpack.config.js

const postcssPresetEnv = require('postcss-preset-env');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

const path = require('path');

module.exports = {
  entry: {
    app: ['./app/_js/index.js', './app/_scss/main.scss'],
    story: ['./app/_js/story.js'],
    html5shiv: ['html5shiv'],
    polyfills: ['picturefill', 'smoothscroll', 'lazysizes'],
  },
  output: {
    filename: 'js/[name].js',
    path: path.resolve(__dirname, 'dist/'),
    publicPath: '/',
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
        },
      },
      {
        test: /\.scss$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
          },
          {
            loader: 'css-loader',
            options: {
              sourceMap: true,
            },
          },
          {
            loader: 'postcss-loader',
            options: {
              ident: 'postcss',
              plugins: () => [
                postcssPresetEnv({
                  stage: 3,
                  features: {
                    'color-mod-function': { unresolved: 'warn' },
                    'custom-media-queries': true,
                  },
                }),
              ],
              sourceMap: true,
            },
          },
          {
            loader: 'sass-loader',
            options: {
              sourceMap: true,
            },
          },
        ],
      },
    ],
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: 'css/[name].css',
    }),
  ],
};