import { TC39AsyncIterableHelpersObject } from "../tests/tc39/async";
import { FilterFn, ForEachFn, MapFn, ReduceFn } from "../operations/async";
import { GuardFilterFn } from "../operations/sync";
export interface TC39AsyncIteratorHelpers<T> {
    map<O>(mapperFn: MapFn<T, O>): TC39AsyncIteratorHelpers<O>;
    filter<Is extends T>(filterFn: GuardFilterFn<T, Is>): TC39AsyncIteratorHelpers<Is>;
    filter(filterFn: FilterFn<T>): TC39AsyncIteratorHelpers<T>;
    take(limit: number): TC39AsyncIteratorHelpers<T>;
    drop(limit: number): TC39AsyncIteratorHelpers<T>;
    flatMap<O>(mapperFn: MapFn<T, Iterable<O>>): TC39AsyncIteratorHelpers<O>;
    reduce<A>(reduceFn: ReduceFn<T, A>, initial: A): Promise<A>;
    toArray(): Promise<T[]>;
    forEach(callbackFn: ForEachFn<T>): Promise<void>;
    some(filterFn: FilterFn<T>): Promise<boolean>;
    every(filterFn: FilterFn<T>): Promise<boolean>;
    find(filterFn: FilterFn<T>): Promise<T | undefined>;
}
declare const TC39AsyncIteratorHelpers_base: import("./construct").TC39IteratorHelpersConstructor<object>;
export declare class TC39AsyncIteratorHelpers<T> extends TC39AsyncIteratorHelpers_base implements TC39AsyncIterableHelpersObject<T> {
    constructor();
    [Symbol.asyncIterator](): AsyncIterator<T>;
}
export {};