brotli.js

/*
 * Copyright 2020 Adobe. All rights reserved.
 * This file is licensed to you under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. You may obtain a copy
 * of the License at http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under
 * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
 * OF ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */

const fs = require('fs');
const glob = require('fast-glob');
const PQueue = require('p-queue').default;
const zlib = require('zlib');

function compress(file) {
  return new Promise((resolve, reject) => {
    fs.createReadStream(file)
      .pipe(zlib.createBrotliCompress())
      .pipe(fs.createWriteStream(file + '.br'))
      .on('error', (err) => reject(err))
      .on('close', () => resolve());
  });
}

async function run() {
  const files = glob.sync('dist/production/**.{js,css,html,map}');

  let queue = new PQueue({concurrency: 10});
  for (let file of files) {
    queue.add(() => compress(file));
  }

  await queue.onEmpty();
}

run().catch(err => {
  console.error(err);
  process.exit(1);
});