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Class: Subject<T> ​

Defined in: node_modules/rxjs/dist/types/internal/Subject.d.ts:11

A Subject is a special type of Observable that allows values to be multicasted to many Observers. Subjects are like EventEmitters.

Every Subject is an Observable and an Observer. You can subscribe to a Subject, and you can call next to feed values as well as error and complete.

Extends ​

  • Observable<T>

Extended by ​

Type Parameters ​

T ​

T

Implements ​

  • SubscriptionLike

Constructors ​

Constructor ​

new Subject<T>(): Subject<T>

Defined in: node_modules/rxjs/dist/types/internal/Subject.d.ts:28

Returns ​

Subject<T>

Overrides ​

Observable<T>.constructor

Properties ​

closed ​

closed: boolean

Defined in: node_modules/rxjs/dist/types/internal/Subject.d.ts:12

Implementation of ​

SubscriptionLike.closed

hasError ​

hasError: boolean

Defined in: node_modules/rxjs/dist/types/internal/Subject.d.ts:19

Deprecated ​

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

isStopped ​

isStopped: boolean

Defined in: node_modules/rxjs/dist/types/internal/Subject.d.ts:17

Deprecated ​

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

observers ​

observers: Observer<T>[]

Defined in: node_modules/rxjs/dist/types/internal/Subject.d.ts:15

Deprecated ​

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

operator ​

operator: Operator<any, T> | undefined

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:17

Deprecated ​

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

Inherited from ​

Observable.operator

source ​

source: Observable<any> | undefined

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:13

Deprecated ​

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

Inherited from ​

Observable.source

thrownError ​

thrownError: any

Defined in: node_modules/rxjs/dist/types/internal/Subject.d.ts:21

Deprecated ​

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

create() ​

static create: (...args) => any

Defined in: node_modules/rxjs/dist/types/internal/Subject.d.ts:27

Creates a "subject" by basically gluing an observer to an observable.

Parameters ​

args ​

...any[]

Returns ​

any

Deprecated ​

Recommended you do not use. Will be removed at some point in the future. Plans for replacement still under discussion.

Overrides ​

Observable.create

Accessors ​

observed ​

Get Signature ​

get observed(): boolean

Defined in: node_modules/rxjs/dist/types/internal/Subject.d.ts:35

Returns ​

boolean

Methods ​

asObservable() ​

asObservable(): Observable<T>

Defined in: node_modules/rxjs/dist/types/internal/Subject.d.ts:42

Creates a new Observable with this Subject as the source. You can do this to create custom Observer-side logic of the Subject and conceal it from code that uses the Observable.

Returns ​

Observable<T>

Observable that this Subject casts to.

complete() ​

complete(): void

Defined in: node_modules/rxjs/dist/types/internal/Subject.d.ts:33

Returns ​

void

error() ​

error(err): void

Defined in: node_modules/rxjs/dist/types/internal/Subject.d.ts:32

Parameters ​

err ​

any

Returns ​

void

forEach() ​

Call Signature ​

forEach(next): Promise<void>

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:90

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, take, takeWhile, or takeUntil amongst others.

Example ​

ts
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) => void

A handler for each value emitted by the observable.

Returns ​

Promise<void>

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

Inherited from ​

Observable.forEach

Call Signature ​

forEach(next, promiseCtor): Promise<void>

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:102

Parameters ​
next ​

(value) => void

a handler for each value emitted by the observable

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

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.

Inherited from ​

Observable.forEach

lift() ​

lift<R>(operator): Observable<R>

Defined in: node_modules/rxjs/dist/types/internal/Subject.d.ts:30

Type Parameters ​

R ​

R

Parameters ​

operator ​

Operator<T, R>

Returns ​

Observable<R>

Deprecated ​

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

Overrides ​

Observable.lift

next() ​

next(value): void

Defined in: node_modules/rxjs/dist/types/internal/Subject.d.ts:31

Parameters ​

value ​

T

Returns ​

void

pipe() ​

Call Signature ​

pipe(): Observable<T>

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:103

Returns ​

Observable<T>

Inherited from ​

Observable.pipe

Call Signature ​

pipe<A>(op1): Observable<A>

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:104

Type Parameters ​
A ​

A

Parameters ​
op1 ​

OperatorFunction<T, A>

Returns ​

Observable<A>

Inherited from ​

Observable.pipe

Call Signature ​

pipe<A, B>(op1, op2): Observable<B>

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:105

Type Parameters ​
A ​

A

B ​

B

Parameters ​
op1 ​

OperatorFunction<T, A>

op2 ​

OperatorFunction<A, B>

Returns ​

Observable<B>

Inherited from ​

Observable.pipe

Call Signature ​

pipe<A, B, C>(op1, op2, op3): Observable<C>

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:106

Type Parameters ​
A ​

A

B ​

B

C ​

C

Parameters ​
op1 ​

OperatorFunction<T, A>

op2 ​

OperatorFunction<A, B>

op3 ​

OperatorFunction<B, C>

Returns ​

Observable<C>

Inherited from ​

Observable.pipe

Call Signature ​

pipe<A, B, C, D>(op1, op2, op3, op4): Observable<D>

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:107

Type Parameters ​
A ​

A

B ​

B

C ​

C

D ​

D

Parameters ​
op1 ​

OperatorFunction<T, A>

op2 ​

OperatorFunction<A, B>

op3 ​

OperatorFunction<B, C>

op4 ​

OperatorFunction<C, D>

Returns ​

Observable<D>

Inherited from ​

Observable.pipe

Call Signature ​

pipe<A, B, C, D, E>(op1, op2, op3, op4, op5): Observable<E>

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:108

Type Parameters ​
A ​

A

B ​

B

C ​

C

D ​

D

E ​

E

Parameters ​
op1 ​

OperatorFunction<T, A>

op2 ​

OperatorFunction<A, B>

op3 ​

OperatorFunction<B, C>

op4 ​

OperatorFunction<C, D>

op5 ​

OperatorFunction<D, E>

Returns ​

Observable<E>

Inherited from ​

Observable.pipe

Call Signature ​

pipe<A, B, C, D, E, F>(op1, op2, op3, op4, op5, op6): Observable<F>

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:109

Type Parameters ​
A ​

A

B ​

B

C ​

C

D ​

D

E ​

E

F ​

F

Parameters ​
op1 ​

OperatorFunction<T, A>

op2 ​

OperatorFunction<A, B>

op3 ​

OperatorFunction<B, C>

op4 ​

OperatorFunction<C, D>

op5 ​

OperatorFunction<D, E>

op6 ​

OperatorFunction<E, F>

Returns ​

Observable<F>

Inherited from ​

Observable.pipe

Call Signature ​

pipe<A, B, C, D, E, F, G>(op1, op2, op3, op4, op5, op6, op7): Observable<G>

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:110

Type Parameters ​
A ​

A

B ​

B

C ​

C

D ​

D

E ​

E

F ​

F

G ​

G

Parameters ​
op1 ​

OperatorFunction<T, 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>

Inherited from ​

Observable.pipe

Call Signature ​

pipe<A, B, C, D, E, F, G, H>(op1, op2, op3, op4, op5, op6, op7, op8): Observable<H>

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:111

Type Parameters ​
A ​

A

B ​

B

C ​

C

D ​

D

E ​

E

F ​

F

G ​

G

H ​

H

Parameters ​
op1 ​

OperatorFunction<T, 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>

Inherited from ​

Observable.pipe

Call Signature ​

pipe<A, B, C, D, E, F, G, H, I>(op1, op2, op3, op4, op5, op6, op7, op8, op9): Observable<I>

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:112

Type Parameters ​
A ​

A

B ​

B

C ​

C

D ​

D

E ​

E

F ​

F

G ​

G

H ​

H

I ​

I

Parameters ​
op1 ​

OperatorFunction<T, 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>

Inherited from ​

Observable.pipe

Call Signature ​

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

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:113

Type Parameters ​
A ​

A

B ​

B

C ​

C

D ​

D

E ​

E

F ​

F

G ​

G

H ​

H

I ​

I

Parameters ​
op1 ​

OperatorFunction<T, 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>[]

Returns ​

Observable<unknown>

Inherited from ​

Observable.pipe

subscribe() ​

Call Signature ​

subscribe(observerOrNext?): Subscription

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:43

Parameters ​
observerOrNext? ​

Partial<Observer<T>> | (value) => void

Returns ​

Subscription

Inherited from ​

Observable.subscribe

Call Signature ​

subscribe(next?, error?, complete?): Subscription

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:45

Parameters ​
next? ​

(value) => void | null

error? ​

(error) => void | null

complete? ​

() => void | null

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

Inherited from ​

Observable.subscribe

toPromise() ​

Call Signature ​

toPromise(): Promise<T | undefined>

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:115

Returns ​

Promise<T | undefined>

Deprecated ​

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

Inherited from ​

Observable.toPromise

Call Signature ​

toPromise(PromiseCtor): Promise<T | undefined>

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:117

Parameters ​
PromiseCtor ​

PromiseConstructor

Returns ​

Promise<T | undefined>

Deprecated ​

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

Inherited from ​

Observable.toPromise

Call Signature ​

toPromise(PromiseCtor): Promise<T | undefined>

Defined in: node_modules/rxjs/dist/types/internal/Observable.d.ts:119

Parameters ​
PromiseCtor ​

PromiseConstructorLike

Returns ​

Promise<T | undefined>

Deprecated ​

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

Inherited from ​

Observable.toPromise

unsubscribe() ​

unsubscribe(): void

Defined in: node_modules/rxjs/dist/types/internal/Subject.d.ts:34

Returns ​

void

Implementation of ​

SubscriptionLike.unsubscribe