Class Deferred<T>

A Deferred object is a Promise with public methods to resolve and reject.

Example:

 const deferred = new Deferred<number>()
 setTimeout(() => {
     deferred.resolve(42)
 }, 1000)

 deferred.then(value => console.log('Resolved to:', value))

Type Parameters

  • T

Implements

  • Promise<T>

Constructors

constructor

Properties

reject resolve

Accessors

[toStringTag]

Methods

catch finally then

Constructors

constructor

  • new Deferred<T>(): Deferred<T>

  • Type Parameters

    • T

    Returns Deferred<T>

Properties

reject

reject: ((reason?: any) => void)

resolve

resolve: ((value: T | PromiseLike<T>) => void)

Accessors

[toStringTag]

  • get [toStringTag](): string

  • Returns string

Methods

catch

  • catch<TResult>(onrejected?): Promise<T | TResult>

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

    Type Parameters

    • TResult = never

    Parameters

    • Optionalonrejected: null | ((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?): 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: null | (() => 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, TResult2>(onfulfilled?, onrejected?): Promise<TResult1 | TResult2>

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

    Type Parameters

    • TResult1 = T
    • TResult2 = never

    Parameters

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

      The callback to execute when the Promise is resolved.

    • Optionalonrejected: null | ((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.

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