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rxjs-compat

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<img src="doc/asset/Rx_Logo_S.png" alt="RxJS Logo" width="86" height="86"> RxJS: Reactive Extensions For JavaScript ======================================

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import { Observable, SubscribableOrPromise } from 'rxjs'; export declare class IfObservable<T> extends Observable<T> { static create<T, R>(condition: () => boolean | void, thenSource?: SubscribableOrPromise<T> | void, elseSource?: SubscribableOrPromise<R> | void): Observable<T | R>; }