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import { Subscriber } from '../Subscriber'; import { rxSubscriber as rxSubscriberSymbol } from '../symbol/rxSubscriber'; import { empty as emptyObserver } from '../Observer'; import { PartialObserver } from '../types'; export function toSubscriber<T>( nextOrObserver?: PartialObserver<T> | ((value: T) => void), error?: (error: any) => void, complete?: () => void): Subscriber<T> { if (nextOrObserver) { if (nextOrObserver instanceof Subscriber) { return (<Subscriber<T>> nextOrObserver); } if (nextOrObserver[rxSubscriberSymbol]) { return nextOrObserver[rxSubscriberSymbol](); } } if (!nextOrObserver && !error && !complete) { return new Subscriber(emptyObserver); } return new Subscriber(nextOrObserver, error, complete); }