workbox-build/src/lib/maximum-size-transform.js

/*
  Copyright 2018 Google LLC

  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/

const prettyBytes = require('pretty-bytes');

module.exports = (maximumFileSizeToCacheInBytes) => {
  return (originalManifest) => {
    const warnings = [];
    const manifest = originalManifest.filter((entry) => {
      if (entry.size <= maximumFileSizeToCacheInBytes) {
        return true;
      }

      warnings.push(`${entry.url} is ${prettyBytes(entry.size)}, and won't ` +
        `be precached. Configure maximumFileSizeToCacheInBytes to change ` +
        `this limit.`);
      return false;
    });

    return {manifest, warnings};
  };
};