import type { Observable, ObservableInput, OperatorFunction } from "rxjs";
/**
 * Applies reduce function and "returns" early if the predicate returns `false` for the accumulator.
 */
export declare function reduceWhile<TValue, TAccumulator>(predicate: (x: TAccumulator) => boolean, reduceFunc: (acc: TAccumulator, val: TValue) => TAccumulator, initial: TAccumulator): OperatorFunction<TValue, TAccumulator | undefined>;
/** Same as `firstValueFrom` except it won't throw if the observable emits no values. */
export declare function toVoidPromise(obs: Observable<any>): Promise<void>;
/** Returns observable results in an array */
export declare function collect<T>(obs: ObservableInput<T>): Promise<T[]>;
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