type Iterators<T> = IterableIterator<T> | Generator<T>;
type AsyncIterators<T> = AsyncIterableIterator<T> | AsyncGenerator<T>;
export declare function iterToAsyncIter<T>(source: Iterators<T>): AsyncIterators<T>;
export declare function chunked<T>(source: AsyncIterators<T>, size: number): AsyncGenerator<T[]>;
export declare function groupByKey<T, K>(source: AsyncIterableIterator<T> | AsyncGenerator<T>, keyFn: (element: T) => K): AsyncGenerator<{
    key: K;
    data: T[];
}, void, undefined>;
export declare function groupByKeyChunked<T, K>(source: AsyncIterators<T>, keyFn: (element: T) => K, size: number): AsyncGenerator<{
    key: K;
    data: T[];
}, void, undefined>;
export declare function withNext<T>(source: AsyncIterators<T>): AsyncGenerator<{
    current: T;
    next?: T;
}>;
export declare function withIndex<T>(source: AsyncIterators<T>): AsyncGenerator<{
    data: T;
    index: number;
}>;
export {};