import { Observable } from '../Observable';
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import { BehaviorSubject } from '../BehaviorSubject';
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import { ConnectableObservable } from '../observable/ConnectableObservable';
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import { UnaryFunction } from '../types';
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/**
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* Creates a {@link ConnectableObservable} that utilizes a {@link BehaviorSubject}.
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*
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* @param initialValue The initial value passed to the {@link BehaviorSubject}.
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* @return A function that returns a {@link ConnectableObservable}
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* @deprecated Will be removed in v8. To create a connectable observable that uses a
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* {@link BehaviorSubject} under the hood, use {@link connectable}.
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* `source.pipe(publishBehavior(initValue))` is equivalent to
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* `connectable(source, { connector: () => new BehaviorSubject(initValue), resetOnDisconnect: false })`.
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* If you're using {@link refCount} after `publishBehavior`, use the {@link share} operator instead.
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* `source.pipe(publishBehavior(initValue), refCount())` is equivalent to
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* `source.pipe(share({ connector: () => new BehaviorSubject(initValue), resetOnError: false, resetOnComplete: false, resetOnRefCountZero: false }))`.
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* Details: https://rxjs.dev/deprecations/multicasting
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*/
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export function publishBehavior<T>(initialValue: T): UnaryFunction<Observable<T>, ConnectableObservable<T>> {
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// Note that this has *never* supported the selector function.
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return (source) => {
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const subject = new BehaviorSubject<T>(initialValue);
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return new ConnectableObservable(source, () => subject);
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};
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}
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