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Snapshot of a stream state at some commit. Unlike RunningState this can not be updated. Only a subset of operations could be performed with an instance of SnapshotState, like StateManager#atCommit or StateManager#atTime.

Hierarchy

  • Observable<StreamState>
    • SnapshotState

Implements

  • Subscribable<StreamState>
  • RunningStateLike

Index

Constructors

constructor

Properties

Readonly id

id: StreamID

operator

operator: Operator<any, StreamState> | undefined
deprecated

Internal implementation detail, do not use directly. Will be made internal in v8.

source

source: Observable<any> | undefined
deprecated

Internal implementation detail, do not use directly. Will be made internal in v8.

Readonly state

state: StreamState

Readonly value

value: StreamState

Static create

create: (...args: any[]) => any

Creates a new Observable by calling the Observable constructor

owner

Observable

method

create

param

the subscriber function to be passed to the Observable constructor

returns

a new observable

nocollapse
deprecated

Use new Observable() instead. Will be removed in v8.

Type declaration

    • (...args: any[]): any
    • Parameters

      • Rest ...args: any[]

      Returns any

Methods

forEach

  • forEach(next: (value: StreamState) => void): Promise<void>
  • forEach(next: (value: StreamState) => void, promiseCtor: PromiseConstructorLike): Promise<void>
  • Used as a NON-CANCELLABLE means of subscribing to an observable, for use with APIs that expect promises, like async/await. You cannot unsubscribe from this.

    WARNING: Only use this with observables you know will complete. If the source observable does not complete, you will end up with a promise that is hung up, and potentially all of the state of an async function hanging out in memory. To avoid this situation, look into adding something like timeout, {@link take}, {@link takeWhile}, or {@link takeUntil} amongst others.

    Example

    import { interval, take } from 'rxjs';
    
    const source$ = interval(1000).pipe(take(4));
    
    async function getTotal() {
      let total = 0;
    
      await source$.forEach(value => {
        total += value;
        console.log('observable -> ' + value);
      });
    
      return total;
    }
    
    getTotal().then(
      total => console.log('Total: ' + total)
    );
    
    // Expected:
    // 'observable -> 0'
    // 'observable -> 1'
    // 'observable -> 2'
    // 'observable -> 3'
    // 'Total: 6'
    

    Parameters

    • next: (value: StreamState) => void

      a handler for each value emitted by the observable

        • (value: StreamState): void
        • Parameters

          • value: StreamState

          Returns void

    Returns Promise<void>

    a promise that either resolves on observable completion or rejects with the handled error

  • deprecated

    Passing a Promise constructor will no longer be available in upcoming versions of RxJS. This is because it adds weight to the library, for very little benefit. If you need this functionality, it is recommended that you either polyfill Promise, or you create an adapter to convert the returned native promise to whatever promise implementation you wanted. Will be removed in v8.

    Parameters

    • next: (value: StreamState) => void

      a handler for each value emitted by the observable

        • (value: StreamState): void
        • Parameters

          • value: StreamState

          Returns void

    • promiseCtor: PromiseConstructorLike

      a constructor function used to instantiate the Promise

    Returns Promise<void>

    a promise that either resolves on observable completion or rejects with the handled error

lift

  • lift<R>(operator?: Operator<StreamState, R>): Observable<R>
  • Creates a new Observable, with this Observable instance as the source, and the passed operator defined as the new observable's operator.

    method

    lift

    deprecated

    Internal implementation detail, do not use directly. Will be made internal in v8. If you have implemented an operator using lift, it is recommended that you create an operator by simply returning new Observable() directly. See "Creating new operators from scratch" section here: https://rxjs.dev/guide/operators

    Type parameters

    • R

    Parameters

    • Optional operator: Operator<StreamState, R>

      the operator defining the operation to take on the observable

    Returns Observable<R>

    a new observable with the Operator applied

next

  • next(value: StreamState): void

pipe

  • pipe(): Observable<StreamState>
  • pipe<A>(op1: OperatorFunction<StreamState, A>): Observable<A>
  • pipe<A, B>(op1: OperatorFunction<StreamState, A>, op2: OperatorFunction<A, B>): Observable<B>
  • pipe<A, B, C>(op1: OperatorFunction<StreamState, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>): Observable<C>
  • pipe<A, B, C, D>(op1: OperatorFunction<StreamState, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>, op4: OperatorFunction<C, D>): Observable<D>
  • pipe<A, B, C, D, E>(op1: OperatorFunction<StreamState, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>, op4: OperatorFunction<C, D>, op5: OperatorFunction<D, E>): Observable<E>
  • pipe<A, B, C, D, E, F>(op1: OperatorFunction<StreamState, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>, op4: OperatorFunction<C, D>, op5: OperatorFunction<D, E>, op6: OperatorFunction<E, F>): Observable<F>
  • pipe<A, B, C, D, E, F, G>(op1: OperatorFunction<StreamState, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>, op4: OperatorFunction<C, D>, op5: OperatorFunction<D, E>, op6: OperatorFunction<E, F>, op7: OperatorFunction<F, G>): Observable<G>
  • pipe<A, B, C, D, E, F, G, H>(op1: OperatorFunction<StreamState, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>, op4: OperatorFunction<C, D>, op5: OperatorFunction<D, E>, op6: OperatorFunction<E, F>, op7: OperatorFunction<F, G>, op8: OperatorFunction<G, H>): Observable<H>
  • pipe<A, B, C, D, E, F, G, H, I>(op1: OperatorFunction<StreamState, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>, op4: OperatorFunction<C, D>, op5: OperatorFunction<D, E>, op6: OperatorFunction<E, F>, op7: OperatorFunction<F, G>, op8: OperatorFunction<G, H>, op9: OperatorFunction<H, I>): Observable<I>
  • pipe<A, B, C, D, E, F, G, H, I>(op1: OperatorFunction<StreamState, A>, op2: OperatorFunction<A, B>, op3: OperatorFunction<B, C>, op4: OperatorFunction<C, D>, op5: OperatorFunction<D, E>, op6: OperatorFunction<E, F>, op7: OperatorFunction<F, G>, op8: OperatorFunction<G, H>, op9: OperatorFunction<H, I>, ...operations: OperatorFunction<any, any>[]): Observable<unknown>
  • Returns Observable<StreamState>

  • Type parameters

    • A

    Parameters

    • op1: OperatorFunction<StreamState, A>

    Returns Observable<A>

  • Type parameters

    • A

    • B

    Parameters

    • op1: OperatorFunction<StreamState, A>
    • op2: OperatorFunction<A, B>

    Returns Observable<B>

  • Type parameters

    • A

    • B

    • C

    Parameters

    • op1: OperatorFunction<StreamState, A>
    • op2: OperatorFunction<A, B>
    • op3: OperatorFunction<B, C>

    Returns Observable<C>

  • Type parameters

    • A

    • B

    • C

    • D

    Parameters

    • op1: OperatorFunction<StreamState, A>
    • op2: OperatorFunction<A, B>
    • op3: OperatorFunction<B, C>
    • op4: OperatorFunction<C, D>

    Returns Observable<D>

  • Type parameters

    • A

    • B

    • C

    • D

    • E

    Parameters

    • op1: OperatorFunction<StreamState, A>
    • op2: OperatorFunction<A, B>
    • op3: OperatorFunction<B, C>
    • op4: OperatorFunction<C, D>
    • op5: OperatorFunction<D, E>

    Returns Observable<E>

  • Type parameters

    • A

    • B

    • C

    • D

    • E

    • F

    Parameters

    • op1: OperatorFunction<StreamState, A>
    • op2: OperatorFunction<A, B>
    • op3: OperatorFunction<B, C>
    • op4: OperatorFunction<C, D>
    • op5: OperatorFunction<D, E>
    • op6: OperatorFunction<E, F>

    Returns Observable<F>

  • Type parameters

    • A

    • B

    • C

    • D

    • E

    • F

    • G

    Parameters

    • op1: OperatorFunction<StreamState, A>
    • op2: OperatorFunction<A, B>
    • op3: OperatorFunction<B, C>
    • op4: OperatorFunction<C, D>
    • op5: OperatorFunction<D, E>
    • op6: OperatorFunction<E, F>
    • op7: OperatorFunction<F, G>

    Returns Observable<G>

  • Type parameters

    • A

    • B

    • C

    • D

    • E

    • F

    • G

    • H

    Parameters

    • op1: OperatorFunction<StreamState, A>
    • op2: OperatorFunction<A, B>
    • op3: OperatorFunction<B, C>
    • op4: OperatorFunction<C, D>
    • op5: OperatorFunction<D, E>
    • op6: OperatorFunction<E, F>
    • op7: OperatorFunction<F, G>
    • op8: OperatorFunction<G, H>

    Returns Observable<H>

  • Type parameters

    • A

    • B

    • C

    • D

    • E

    • F

    • G

    • H

    • I

    Parameters

    • op1: OperatorFunction<StreamState, A>
    • op2: OperatorFunction<A, B>
    • op3: OperatorFunction<B, C>
    • op4: OperatorFunction<C, D>
    • op5: OperatorFunction<D, E>
    • op6: OperatorFunction<E, F>
    • op7: OperatorFunction<F, G>
    • op8: OperatorFunction<G, H>
    • op9: OperatorFunction<H, I>

    Returns Observable<I>

  • Type parameters

    • A

    • B

    • C

    • D

    • E

    • F

    • G

    • H

    • I

    Parameters

    • op1: OperatorFunction<StreamState, A>
    • op2: OperatorFunction<A, B>
    • op3: OperatorFunction<B, C>
    • op4: OperatorFunction<C, D>
    • op5: OperatorFunction<D, E>
    • op6: OperatorFunction<E, F>
    • op7: OperatorFunction<F, G>
    • op8: OperatorFunction<G, H>
    • op9: OperatorFunction<H, I>
    • Rest ...operations: OperatorFunction<any, any>[]

    Returns Observable<unknown>

subscribe

  • subscribe(observer?: Partial<Observer<StreamState>>): Subscription
  • subscribe(next: (value: StreamState) => void): Subscription
  • subscribe(next?: ((value: StreamState) => void) | null, error?: ((error: any) => void) | null, complete?: (() => void) | null): Subscription
  • Parameters

    • Optional observer: Partial<Observer<StreamState>>

    Returns Subscription

  • Parameters

    • next: (value: StreamState) => void
        • (value: StreamState): void
        • Parameters

          • value: StreamState

          Returns void

    Returns Subscription

  • deprecated

    Instead of passing separate callback arguments, use an observer argument. Signatures taking separate callback arguments will be removed in v8. Details: https://rxjs.dev/deprecations/subscribe-arguments

    Parameters

    • Optional next: ((value: StreamState) => void) | null
    • Optional error: ((error: any) => void) | null
    • Optional complete: (() => void) | null

    Returns Subscription

toPromise

  • toPromise(): Promise<StreamState | undefined>
  • toPromise(PromiseCtor: typeof Promise): Promise<StreamState | undefined>
  • toPromise(PromiseCtor: PromiseConstructorLike): Promise<StreamState | undefined>
  • deprecated

    Replaced with {@link firstValueFrom} and {@link lastValueFrom}. Will be removed in v8. Details: https://rxjs.dev/deprecations/to-promise

    Returns Promise<StreamState | undefined>

  • deprecated

    Replaced with {@link firstValueFrom} and {@link lastValueFrom}. Will be removed in v8. Details: https://rxjs.dev/deprecations/to-promise

    Parameters

    • PromiseCtor: typeof Promise

    Returns Promise<StreamState | undefined>

  • deprecated

    Replaced with {@link firstValueFrom} and {@link lastValueFrom}. Will be removed in v8. Details: https://rxjs.dev/deprecations/to-promise

    Parameters

    • PromiseCtor: PromiseConstructorLike

    Returns Promise<StreamState | undefined>