rxjs-compat/operator/filter.d.ts

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