webpack.config.js

require('dotenv').config();
const path = require('path');
const webpack = require('webpack');

module.exports = {
  entry: './frontend/entry.jsx',
  output: {
    path: path.resolve(__dirname, 'app', 'assets', 'javascripts'),
    filename: 'bundle.js',
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: JSON.stringify(process.env.NODE_ENV),
        SCREENSHOT_URL: JSON.stringify(process.env.SCREENSHOT_URL),
        UNSPLASH_ACCESS_KEY: JSON.stringify(process.env.UNSPLASH_ACCESS_KEY),
      },
    }),
  ],
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /(node_modules)/,
        use: {
          loader: 'babel-loader',
          query: {
            presets: ['@babel/env', '@babel/react'],
          },
        },
      },
      {
        test: /\.css$/,
        use: [
          'style-loader',
          {
            loader: 'css-loader',
            options: {
              importLoaders: 1,
              modules: {
                mode: 'local',
                localIdentName: '[name]__[local]--[hash:base64:5]',
              },
            },
          },
        ],
        include: /\.module\.css$/,
      },
      {
        test: /\.css$/,
        use: [
          'style-loader',
          'css-loader',
        ],
        exclude: /\.module\.css$/,
      },
    ],
  },
  resolve: {
    extensions: ['.js', '.jsx', '*'],
  },
  devtool: 'source-map',
};