Please correct me if I'm wrong. But you'd better avoid creating extra promises f...

Please correct me if I'm wrong. But you'd better avoid creating extra promises for performance reasons

  const promiseMap<key, Promise<any>> = new Map();

  async function keyedDebounce<R>(key: string, fn: () => R) {
    const existingPromise = promiseMap.get(key);
    if (existingPromise) return existingPromise;
  
    const promise = fn().then(result => {
      promiseMap.delete(key);
  
      return result;
    });
  
    promiseMap.set(key, promise);
  
    return promise;
  }