src/common/optionsUtils.js

import optionsPrototype from './optionsPrototype.json5';
import specialOptions from './specialOptions.json5';

export {optionsPrototype, specialOptions};

// Adds missing options with their default value. If |dryRun| is set to false,
// they are also saved to the sync storage area.
export function cleanUpOptions(options, dryRun = false) {
  console.log('[cleanUpOptions] Previous options', JSON.stringify(options));

  if (typeof options !== 'object' || options === null) options = {};

  var ok = true;
  for (const [opt, optMeta] of Object.entries(optionsPrototype)) {
    if (!(opt in options)) {
      ok = false;
      options[opt] = optMeta['defaultValue'];
    }
  }

  console.log('[cleanUpOptions] New options', JSON.stringify(options));

  if (!ok && !dryRun) {
    chrome.storage.sync.set(options);
  }

  return options;
}