Class GarbageCollector

packager/src/lib/TransformCache.js:173–220

 * running at the same time.
 */
const GARBAGE_COLLECTOR = new (class GarbageCollector {

  _lastCollected: ?number;
  _cacheWasReset: boolean;

  constructor() {
    this._cacheWasReset = false;
  }

  /**
   * We want to avoid preventing tool use if the cleanup fails for some reason,
   * but still provide some chance for people to report/fix things.
   */
  _collectSyncNoThrow() {
    try {
      collectCacheIfOldSync();
    } catch (error) {
      terminal.log(error.stack);
      terminal.log(
        'Error: Cleaning up the cache folder failed. Continuing anyway.',
      );
      terminal.log('The cache folder is: %s', getCacheDirPath());
    }
    this._lastCollected = Date.now();
  }

  _resetCache(reporter: Reporter) {
    rimraf.sync(getCacheDirPath());
    reporter.update({type: 'transform_cache_reset'});
    this._cacheWasReset = true;
    this._lastCollected = Date.now();
  }

  collectIfNecessarySync(options: CacheOptions) {
    if (options.resetCache && !this._cacheWasReset) {
      this._resetCache(options.reporter);
      return;
    }
    const lastCollected = this._lastCollected;
    if (
      lastCollected == null ||
      Date.now() - lastCollected > GARBAGE_COLLECTION_PERIOD
    ) {
      this._collectSyncNoThrow();
    }
  }

})();

/**
 * When restarting packager we want to avoid running the collection over again, so we store