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@reactivex/rxjs

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Reactive Extensions for modern JavaScript

github.com/ReactiveX/RxJS

reactivex/rxjs

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import { Observable } from 'rxjs'; export declare function find<T, S extends T>(this: Observable<T>, predicate: (value: T, index: number) => value is S, thisArg?: any): Observable<S | undefined>; export declare function find<T>(this: Observable<T>, predicate: (value: T, index: number) => boolean, thisArg?: any): Observable<T | undefined>;