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Observable

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Observable sequence of values and errors, see TC39.

https://github.com/tc39/proposal-observable

This is used as a common return type for observable values and can be created using many different observable implementations, such as zen-observable or RxJS 5.

Signature:

export type Observable<T> = {
[Symbol.observable](): Observable<T>;
subscribe(observer: Observer<T>): Subscription;
subscribe(onNext?: (value: T) => void, onError?: (error: Error) => void, onComplete?: () => void): Subscription;
};

References: Observable, Observer, Subscription