A Cache for data with a configurable ttl, useful for filtering duplicate events

ExpiringDataCache.ts

class ExpiringDataCache {
  private _cache: any[] = [];
  public expirationTime = 100;

  set cache(value: any) {
    this.expiredCache.push({value, ttl: Date.now() + this.expirationTime});
  }

  get cache() {
    return this.expiredCache.map(item => item.value);
  }

  private get expiredCache() {
    return (this._cache = this._cache.filter(entry => entry.ttl > Date.now()));
  }
}