write-stats.js

var fs = require('fs');
var fse = require('fs-extra');
var path = require('path');
var mkdirp = require('mkdirp');

// The file we'll write the stats to.
var deployPath = path.resolve(__dirname, '../../../deploy/');
var filepath = deployPath + '/.webpack-stats.json';

// JSON object of the stats.
var json;

// Public path, e.g. 'http://localhost:3000/bundles/'.
var publicPath;

/**
 * Get chunks by name and extensions, with the public path prepended.
 *
 * @param {String} name Chunk name
 * @param {String} ext Type extension
 * @returns {Array} The filtered chunks
 */
function getChunks(name, ext) {
  var chunk = json.assetsByChunkName[name];

  // A chunk could be a string or an array, so make sure it is an array.
  if (!(Array.isArray(chunk))) {
    chunk = [chunk];
  }

  return chunk
    // Filter by extension.
    .filter(function filterByExtension(chunkName) {
      return path.extname(chunkName) === '.' + ext;
    })
    // Append the public path.
    .map(function appendPublicPath(chunkName) {
      return publicPath + chunkName;
    });
}

/**
 * Write the stats file synchronously.
 *
 * @param {Object} stats Stat information about the generated chunks
 */
function writeStats(stats) {
  json = stats.toJson();
  publicPath = this.options.output.publicPath;

  // Ensure the deploy directory exists.
  fse.ensureDirSync(deployPath);

  // Write the chunks to a JSON file.
  fs.writeFileSync(filepath, JSON.stringify({
    'script': getChunks('main', 'js'),
    'css': getChunks('main', 'css')
  }));
}

module.exports = writeStats;