webpack.config.js

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

const mode =
  process.env.NODE_ENV === 'production' ? 'production' : 'development';
const publicOutputPath = 'http://localhost:9002/wp/';

module.exports = {
  mode,
  // In production, always be IE11 compatible. In dev, be IE11 compatible
  // if IE11=1 is in the environment, as this currently breaks hot reload:
  // https://github.com/webpack/webpack-dev-server/issues/2758
  target: process.env.IE11 ? 'es5' : mode === 'development' ? 'web' : 'es5',
  entry: [
    `./src/js/index.js`,
    `./src/scss/index.scss`
  ],
  output: {
    ...(mode === 'development'
      ? {
        filename: 'site.js',
        publicPath: publicOutputPath
      }
      : {
        path: path.resolve(
          __dirname,
          `lib/modules/apostrophe-assets/public/js`
        ),
        filename: 'site.js'
      }),
    chunkFormat: 'array-push'
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new MiniCssExtractPlugin({
      filename: mode === 'development' ? 'site.css' : '../css/site.css'
    })
  ],
  ...(mode === 'development'
    ? {
      devServer: {
        hot: true,
        inline: true,
        host: '0.0.0.0',
        headers: {
          'Access-Control-Allow-Origin': '*'
        },
        publicPath: '/wp/',
        port: 9002,
        allowedHosts: ['.localhost'],
        proxy: {
          '/': 'http://localhost:3000'
        }
      }
    }
    : {}),
  module: {
    rules: [
      {
        test: /\.js$/,
        use: [
          {
            loader: 'babel-loader',
            options: {
              presets: ['@babel/preset-env']
            }
          }
        ]
      },
      {
        test: /\.scss$/,
        use: [
          // Instead of style-loader, to avoid a flash of
          // unstyled content
          MiniCssExtractPlugin.loader,
          // Parses CSS imports
          'css-loader',
          // Parses SASS imports
          'sass-loader'
        ]
      }
    ]
  }
};