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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 } from 'rxjs'; export declare function defaultIfEmpty<T>(this: Observable<T>, defaultValue?: T): Observable<T>; export declare function defaultIfEmpty<T, R>(this: Observable<T>, defaultValue?: R): Observable<T | R>;