import { AsyncIterableX } from '../asynciterable';
/**
* Filters a sequence of values based on a predicate.
* @param {Iterable<T | Promise<T>> | AsyncIterable<T>} source Source sequence.
* @param {function(value: T, index: number): boolean | Promise<boolean>} predicate A function to test each source element for a condition.
* @param {Object} [thisArg] Value to use as this when executing callback.
* @return {AsyncIterable<T>} Sequence that contains elements from the input sequence that satisfy the condition.
*/
export declare function filterAsync<TSource>(source: Iterable<TSource | PromiseLike<TSource>> | AsyncIterable<TSource>, predicate: (value: TSource, index: number) => boolean | Promise<boolean>, thisArg?: any): AsyncIterableX<TSource>;