Class LazyPromise<T>

constructor

• new LazyPromise<T = any>(executor: PromiseExecutor<T>): LazyPromise<T>

• LazyPromise, execute async operation when user await it.

  Type Parameters

  • T = any

  Parameters

  • executor: PromiseExecutor<T>

    Promise executor

  Returns LazyPromise<T>

[toStringTag]

catch

• catch<TResult = never>(
      onrejected?: (reason: any) => TResult | PromiseLike<TResult>,
  ): Promise<T | TResult>

• Attaches a callback for only the rejection of the Promise.

  Type Parameters

  • TResult = never

  Parameters

  • Optionalonrejected: (reason: any) => TResult | PromiseLike<TResult>

    The callback to execute when the Promise is rejected.

  Returns Promise<T | TResult>

  A Promise for the completion of the callback.

finally

• finally(onfinally?: () => void): Promise<T>

• Attaches a callback that is invoked when the Promise is settled (fulfilled or rejected). The resolved value cannot be modified from the callback.

  Parameters

  • Optionalonfinally: () => void

    The callback to execute when the Promise is settled (fulfilled or rejected).

  Returns Promise<T>

  A Promise for the completion of the callback.

then

• then<TResult1 = T, TResult2 = never>(
      onfulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,
      onrejected?: (reason: any) => TResult2 | PromiseLike<TResult2>,
  ): Promise<TResult1 | TResult2>

• Attaches callbacks for the resolution and/or rejection of the Promise.

  Type Parameters

  • TResult1 = T
  • TResult2 = never

  Parameters

  • Optionalonfulfilled: (value: T) => TResult1 | PromiseLike<TResult1>

    The callback to execute when the Promise is resolved.
  • Optionalonrejected: (reason: any) => TResult2 | PromiseLike<TResult2>

    The callback to execute when the Promise is rejected.

  Returns Promise<TResult1 | TResult2>

  A Promise for the completion of which ever callback is executed.