webpack.config.js

const webpack = require('webpack');
const path = require('path');
const fileSystem = require('fs');
const env = require('./utils/env');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const WriteFilePlugin = require('write-file-webpack-plugin');

// load the secrets
const alias = {};

const secretsPath = path.join(__dirname, (`secrets.${env.NODE_ENV}.js`));

const fileExtensions = ['jpg', 'jpeg', 'png', 'gif', 'eot', 'otf', 'svg', 'ttf', 'woff', 'woff2'];

if (fileSystem.existsSync(secretsPath)) {
  alias.secrets = secretsPath;
}

const options = {
  target: 'web',
  entry: {
    index: path.join(__dirname, 'src', 'index.js'),
  },
  output: {
    path: path.join(__dirname, 'build'),
    filename: '[name].bundle.js',
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        loader: 'style-loader!css-loader',
        exclude: /node_modules/,
      },
      {
        test: new RegExp(`.(${fileExtensions.join('|')})$`),
        loader: 'file-loader?name=[name].[ext]',
        exclude: /node_modules/,
      },
      {
        test: /\.html$/,
        loader: 'html-loader',
        exclude: /node_modules/,
      },
    ],
  },
  resolve: {
    alias,
  },
  plugins: [
    // clean the build folder
    new CleanWebpackPlugin(['build']),
    // expose and write the allowed env vars on the compiled bundle
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify(env.NODE_ENV),
    }),
    new CopyWebpackPlugin([{
      from: 'src/manifest.json',
      transform: content =>
        Buffer.from(JSON.stringify({
          description: process.env.npm_package_description,
          version: process.env.npm_package_version,
          ...JSON.parse(content.toString()),
        })),
    }]),
    new WriteFilePlugin(),
  ],
};

if (env.NODE_ENV === 'development') {
  options.devtool = 'cheap-module-eval-source-map';
}

module.exports = options;