Class CancellablePromise<T>

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A promise with a cancel method. If canceled, the CancellablePromise will reject with a Cancellation object. Originally from real-cancellable-promise.

Type Parameters

T

what the CancellablePromise resolves to

Hierarchy

CancellablePromise

Index

Constructors

constructor

new CancellablePromise<T>(promise, cancel): CancellablePromise<T>
Type Parameters
- T
Parameters
- promise: PromiseLike<T>
  
  a normal promise or thenable
- cancel: ((reason?) => void)
  
  a function that cancels promise. Calling cancel after promise has resolved must be a no-op.
  - - (reason?): void
    - Parameters
      
      Optional reason: string
      
      Returns void
Returns CancellablePromise<T>
- Defined in example/src/classes/CancellablePromise.ts:70

Properties

`Protected` `Readonly` promise

promise: Promise<T>

As a consumer of the library, you shouldn't ever need to access CancellablePromise.promise directly.

If you are subclassing CancellablePromise for some reason, you can access this property.

`Readonly` cancel

cancel: ((reason?) => void)

Type declaration

- (reason?): void
- Cancel the CancellablePromise.
  Parameters
  - Optional reason: string
  Returns void

Methods

`Static` resolve

resolve(): CancellablePromise<void>
Analogous to Promise.resolve.

The returned promise should resolve even if it is canceled. The idea is that the promise is resolved instantaneously, so by the time the promise is canceled, it has already resolved.

Returns CancellablePromise<void>
- Defined in example/src/classes/CancellablePromise.ts:179
resolve<T>(value): CancellablePromise<T>
Type Parameters
- T
Parameters
- value: T
Returns CancellablePromise<T>
- Defined in example/src/classes/CancellablePromise.ts:181

`Static` reject

reject<T>(reason?): CancellablePromise<T>
Analogous to Promise.reject.

Like CancellablePromise.resolve, canceling the returned CancellablePromise is a no-op.
Type Parameters
- T
Parameters
- Optional reason: unknown
  
  this should probably be an Error object
Returns CancellablePromise<T>
- Defined in example/src/classes/CancellablePromise.ts:195

`Static` all

all<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>(values): CancellablePromise<[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10]>
Analogous to Promise.all.
Type Parameters
- T1
- T2
- T3
- T4
- T5
- T6
- T7
- T8
- T9
- T10
Parameters
- values: readonly [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>, T8 | PromiseLike<T8>, T9 | PromiseLike<T9>, T10 | PromiseLike<T10>]
  
  an array that may contain CancellablePromises, promises, thenables, and resolved values
Returns CancellablePromise<[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10]>
a CancellablePromise, which, if canceled, will cancel each of the promises passed in to CancellablePromise.all.
- Defined in example/src/classes/CancellablePromise.ts:199
all<T1, T2, T3, T4, T5, T6, T7, T8, T9>(values): CancellablePromise<[T1, T2, T3, T4, T5, T6, T7, T8, T9]>
Analogous to Promise.all.
Type Parameters
- T1
- T2
- T3
- T4
- T5
- T6
- T7
- T8
- T9
Parameters
- values: readonly [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>, T8 | PromiseLike<T8>, T9 | PromiseLike<T9>]
  
  an array that may contain CancellablePromises, promises, thenables, and resolved values
Returns CancellablePromise<[T1, T2, T3, T4, T5, T6, T7, T8, T9]>
a CancellablePromise, which, if canceled, will cancel each of the promises passed in to CancellablePromise.all.
- Defined in example/src/classes/CancellablePromise.ts:214
all<T1, T2, T3, T4, T5, T6, T7, T8>(values): CancellablePromise<[T1, T2, T3, T4, T5, T6, T7, T8]>
Analogous to Promise.all.
Type Parameters
- T1
- T2
- T3
- T4
- T5
- T6
- T7
- T8
Parameters
- values: readonly [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>, T8 | PromiseLike<T8>]
  
  an array that may contain CancellablePromises, promises, thenables, and resolved values
Returns CancellablePromise<[T1, T2, T3, T4, T5, T6, T7, T8]>
a CancellablePromise, which, if canceled, will cancel each of the promises passed in to CancellablePromise.all.
- Defined in example/src/classes/CancellablePromise.ts:228
all<T1, T2, T3, T4, T5, T6, T7>(values): CancellablePromise<[T1, T2, T3, T4, T5, T6, T7]>
Analogous to Promise.all.
Type Parameters
- T1
- T2
- T3
- T4
- T5
- T6
- T7
Parameters
- values: readonly [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>]
  
  an array that may contain CancellablePromises, promises, thenables, and resolved values
Returns CancellablePromise<[T1, T2, T3, T4, T5, T6, T7]>
a CancellablePromise, which, if canceled, will cancel each of the promises passed in to CancellablePromise.all.
- Defined in example/src/classes/CancellablePromise.ts:241
all<T1, T2, T3, T4, T5, T6>(values): CancellablePromise<[T1, T2, T3, T4, T5, T6]>
Analogous to Promise.all.
Type Parameters
- T1
- T2
- T3
- T4
- T5
- T6
Parameters
- values: readonly [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>]
  
  an array that may contain CancellablePromises, promises, thenables, and resolved values
Returns CancellablePromise<[T1, T2, T3, T4, T5, T6]>
a CancellablePromise, which, if canceled, will cancel each of the promises passed in to CancellablePromise.all.
- Defined in example/src/classes/CancellablePromise.ts:253
all<T1, T2, T3, T4, T5>(values): CancellablePromise<[T1, T2, T3, T4, T5]>
Analogous to Promise.all.
Type Parameters
- T1
- T2
- T3
- T4
- T5
Parameters
- values: readonly [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>]
  
  an array that may contain CancellablePromises, promises, thenables, and resolved values
Returns CancellablePromise<[T1, T2, T3, T4, T5]>
a CancellablePromise, which, if canceled, will cancel each of the promises passed in to CancellablePromise.all.
- Defined in example/src/classes/CancellablePromise.ts:264
all<T1, T2, T3, T4>(values): CancellablePromise<[T1, T2, T3, T4]>
Analogous to Promise.all.
Type Parameters
- T1
- T2
- T3
- T4
Parameters
- values: readonly [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>]
  
  an array that may contain CancellablePromises, promises, thenables, and resolved values
Returns CancellablePromise<[T1, T2, T3, T4]>
a CancellablePromise, which, if canceled, will cancel each of the promises passed in to CancellablePromise.all.
- Defined in example/src/classes/CancellablePromise.ts:274
all<T1, T2, T3>(values): CancellablePromise<[T1, T2, T3]>
Analogous to Promise.all.
Type Parameters
- T1
- T2
- T3
Parameters
- values: readonly [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>]
  
  an array that may contain CancellablePromises, promises, thenables, and resolved values
Returns CancellablePromise<[T1, T2, T3]>
a CancellablePromise, which, if canceled, will cancel each of the promises passed in to CancellablePromise.all.
- Defined in example/src/classes/CancellablePromise.ts:283
all<T1, T2>(values): CancellablePromise<[T1, T2]>
Analogous to Promise.all.
Type Parameters
- T1
- T2
Parameters
- values: readonly [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>]
  
  an array that may contain CancellablePromises, promises, thenables, and resolved values
Returns CancellablePromise<[T1, T2]>
a CancellablePromise, which, if canceled, will cancel each of the promises passed in to CancellablePromise.all.
- Defined in example/src/classes/CancellablePromise.ts:291
all<T>(values): CancellablePromise<T[]>
Analogous to Promise.all.
Type Parameters
- T
Parameters
- values: readonly (T | PromiseLike<T>)[]
  
  an array that may contain CancellablePromises, promises, thenables, and resolved values
Returns CancellablePromise<T[]>
a CancellablePromise, which, if canceled, will cancel each of the promises passed in to CancellablePromise.all.
- Defined in example/src/classes/CancellablePromise.ts:295

`Static` allSettled

allSettled<T>(values): CancellablePromise<{
    -readonly [P in string | number | symbol]: PromiseSettledResult<T[P] extends PromiseLike<U>
        ? U
        : T[P]>
}>
Creates a CancellablePromise that is resolved with an array of results when all of the provided Promises resolve or reject.
Type Parameters
- T extends readonly unknown[] | readonly [unknown]
Parameters
- values: T
  
  An array of Promises.
Returns CancellablePromise<{
    -readonly [P in string | number | symbol]: PromiseSettledResult<T[P] extends PromiseLike<U>
        ? U
        : T[P]>
}>
A new CancellablePromise.
- Defined in example/src/classes/CancellablePromise.ts:321
allSettled<T>(values): CancellablePromise<PromiseSettledResult<T extends PromiseLike<U>
? U
: T>[]>
Creates a CancellablePromise that is resolved with an array of results when all of the provided Promises resolve or reject.
Type Parameters
- T
Parameters
- values: Iterable<T>
  
  An array of Promises.
Returns CancellablePromise<PromiseSettledResult<T extends PromiseLike<U>
? U
: T>[]>
A new CancellablePromise. Canceling it cancels all of the input promises.
- Defined in example/src/classes/CancellablePromise.ts:337

`Static` race

race<T>(values): CancellablePromise<Awaited<T>>
Creates a CancellablePromise that is resolved or rejected when any of the provided Promises are resolved or rejected.
Type Parameters
- T
Parameters
- values: readonly T[]
  
  An array of Promises.
Returns CancellablePromise<Awaited<T>>
A new CancellablePromise. Canceling it cancels all of the input promises.
- Defined in example/src/classes/CancellablePromise.ts:362

`Static` delay

delay(ms): CancellablePromise<void>
Parameters
- ms: number
Returns CancellablePromise<void>
a CancellablePromise that resolves after ms milliseconds.
- Defined in example/src/classes/CancellablePromise.ts:377

then

then<TResult1, TResult2>(onFulfilled?, onRejected?): CancellablePromise<TResult1 | TResult2>
Analogous to Promise.then.

onFulfilled on onRejected can return a value, a normal promise, or a CancellablePromise. So you can make a chain a CancellablePromises like this:
```
const overallPromise = cancellableAsyncFunction1()
    .then(cancellableAsyncFunction2)
    .then(cancellableAsyncFunction3)
    .then(cancellableAsyncFunction4)
```
Then if you call overallPromise.cancel, cancel is called on all CancellablePromises in the chain! In practice, this means that whichever async operation is in progress will be canceled.
Type Parameters
- TResult1 = T
- TResult2 = never
Parameters
- Optional onFulfilled: null | ((value) => TResult1 | PromiseLike<TResult1>)
- Optional onRejected: null | ((reason) => TResult2 | PromiseLike<TResult2>)
Returns CancellablePromise<TResult1 | TResult2>
a new CancellablePromise
- Defined in example/src/classes/CancellablePromise.ts:95

catch

catch<TResult>(onRejected?): CancellablePromise<T | TResult>
Analogous to Promise.catch.
Type Parameters
- TResult = never
Parameters
- Optional onRejected: null | ((reason) => TResult | PromiseLike<TResult>)
Returns CancellablePromise<T | TResult>
- Defined in example/src/classes/CancellablePromise.ts:146

finally

finally(onFinally?): CancellablePromise<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
- Optional onFinally: null | (() => void)
  
  The callback to execute when the Promise is settled (fulfilled or rejected).
Returns CancellablePromise<T>
A Promise for the completion of the callback.
- Defined in example/src/classes/CancellablePromise.ts:163

Class CancellablePromise<T>

Type Parameters

T

Hierarchy

Index

Constructors

Properties

Methods

Constructors

constructor

Type Parameters

T

Parameters

promise: PromiseLike<T>

cancel: ((reason?) => void)

Parameters

Optional reason: string

Returns void

Returns CancellablePromise<T>

Properties

Protected Readonly promise

Readonly cancel

Type declaration

Parameters

Optional reason: string

Returns void

Methods

Static resolve

Returns CancellablePromise<void>

Type Parameters

T

Parameters

value: T

Returns CancellablePromise<T>

Static reject

Type Parameters

T

Parameters

Optional reason: unknown

Returns CancellablePromise<T>

Static all

Type Parameters

T1

T2

T3

T4

T5

T6

T7

T8

T9

T10

Parameters

values: readonly [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>, T8 | PromiseLike<T8>, T9 | PromiseLike<T9>, T10 | PromiseLike<T10>]

Returns CancellablePromise<[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10]>

Type Parameters

T1

T2

T3

T4

T5

T6

T7

T8

T9

Parameters

values: readonly [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>, T8 | PromiseLike<T8>, T9 | PromiseLike<T9>]

Returns CancellablePromise<[T1, T2, T3, T4, T5, T6, T7, T8, T9]>

Type Parameters

T1

T2

T3

T4

T5

T6

T7

T8

Parameters

values: readonly [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>, T8 | PromiseLike<T8>]

Returns CancellablePromise<[T1, T2, T3, T4, T5, T6, T7, T8]>

`Optional` reason: string

`Protected` `Readonly` promise

`Readonly` cancel

`Optional` reason: string

`Static` resolve

`Static` reject

`Optional` reason: unknown

`Static` all

`Static` allSettled

Returns CancellablePromise<{
-readonly [P in string | number | symbol]: PromiseSettledResult<T[P] extends PromiseLike<U>
? U
: T[P]>
}>

Returns CancellablePromise<PromiseSettledResult<T extends PromiseLike<U>
? U
: T>[]>