webpack.config.js

const path = require('path');
const webpack = require('webpack');
const isProd = process.env.NODE_ENV === 'production';


module.exports = [
  {
    name: 'plugin',
    entry: {
      // replace this with your source file
      algolia: path.join(
        process.cwd(),
        'public/shopify/assets/javascripts/v4/externals.js'
      ),
    },
    output: {
      // replace this with your output folder
      path: path.resolve(process.cwd(), 'public/shopify/assets/javascripts/v4'),
      filename: 'algolia_externals.js',
      library: 'algoliaShopify.externals',
      libraryTarget: 'assign',
    },
    devtool: isProd ? false : 'cheap-module-inline-source-map',
    module: {
      rules: [
        {
          test: /\.(js|jsx)$/,
          loader: 'babel-loader',
        },
      ],
    },
    target: 'web',
    plugins: [
      new webpack.DefinePlugin({
        'process.env': {
          NODE_ENV: JSON.stringify(process.env.NODE_ENV),
        },
      }),
      isProd &&
        new webpack.optimize.UglifyJsPlugin({
          test: /\.js/i,
          compress: {
            warnings: false,
            screw_ie8: true,
            conditionals: true,
            unused: true,
            comparisons: true,
            sequences: true,
            dead_code: true,
            evaluate: true,
            if_return: true,
            join_vars: true,
          },
          output: {
            comments: false,
          },
        }),
    ].filter(Boolean),
  },
];