webpack.server.config.js

webpack.server.config.js

const path = require('path');
const nodeExternals = require('webpack-node-externals');

module.exports = (env, argv) => {
  const SERVER_PATH = (argv.mode === 'production') ?
      './app/javascript/server/server-prod.js' :
      './app/javascript/server/server-dev.js';
  return ({
    entry: {
      server: SERVER_PATH
    },
    output: {
      path: path.join(__dirname, 'dist'),
      publicPath: '/',
      filename: '[name].js'
    },
    target: 'node',
    node: {
      // Need this when working with express, otherwise the build fails
      __dirname: false,   // if you don't put this is, __dirname
      __filename: false  // and __filename return blank or /
    },
    externals: [nodeExternals()], // Need this to avoid error when working with Express
    module: {
      rules: [
        {
          // Transpiles ES6-8 into ES5
          test: /\.js$/,
          exclude: /node_modules/,
          use: {
            loader: 'babel-loader'
          }
        }
      ]
    }
  });
};