import { AnyIterable } from './types';
export declare function transform<T, R>(concurrency: number): {
    (func: (data: T) => R | Promise<R>, iterable: AnyIterable<T>): AsyncIterableIterator<R>;
    (func: (data: T) => R | Promise<R>): (iterable: AnyIterable<T>) => AsyncIterableIterator<R>;
};
export declare function transform<T, R>(concurrency: number, func: (data: T) => R | Promise<R>): (iterable: AnyIterable<T>) => AsyncIterableIterator<R>;
export declare function transform<T, R>(concurrency: number, func: (data: T) => R | Promise<R>, iterable: AnyIterable<T>): AsyncIterableIterator<R>;