18F/calc

const path = require('path');
const webpackStream = require('webpack-stream');
const webpack = require('webpack');
const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer');
const { ReactLoadablePlugin } = require('react-loadable/webpack');


const USE_POLLING = 'USE_POLLING' in process.env;

exports.scriptSources = ({ bundles, rootDir }) => Object.keys(bundles).map((name) => {
  const options = bundles[name];
  const dirName = options.dirName || name;
  return path.join(rootDir, dirName, 'index.js');
});

exports.getLastFolderName = (file) => {
  // All of our bundle entry files are of the form  "/some/path/index.js".
  // We'll use the last folder name to generate the file name of the
  // bundles (ie, "path.js") so that they're not all called "index.js".
  const parts = file.path.split(path.sep);
  const lastFolderName = parts[parts.length - 2];

  return lastFolderName;
};

exports.webpackify = ({ isWatching, isProd }, cb, taskNum) => webpackStream({
  mode: isProd ? 'production' : 'development',
  watch: isWatching,
  watchOptions: USE_POLLING ? {
    aggregateTimeout: 300,
    poll: 500,
  } : {},
  resolve: {
    extensions: ['.js', '.jsx'],
  },
  context: path.normalize(path.join(__dirname, '..', '..')),
  node: {
    __filename: true,
  },
  devtool: isProd ? 'source-map' : 'eval-source-map',
  plugins: [
    new ReactLoadablePlugin({
      filename: './frontend/static/frontend/built/js/react-loadable.json',
    }),
    new BundleAnalyzerPlugin({
      analyzerMode: 'disabled',
      generateStatsFile: true,
      statsFilename: './frontend/static/frontend/built/js/stats.json',
    }),
  ],
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
        options: {
          presets: ['env', 'react'],
          cacheDirectory: true,
        },
      },
    ],
  },
  output: {
    chunkFilename: '[name].bundle.js',
    publicPath: '/static/frontend/built/js/',
  },
}, webpack, () => {
  // Only execute this callback the first time, so that gulp knows
  // we're done.
  if (taskNum === 1) {
    cb();
  }
  taskNum++; // Increment the task counter
});