/**
 * Lazily maps values from an iterable using a generator
 * @param {Iterable<T>} iterable - The source iterable
 * @param {(value: T, index: number) => U} function_ - The mapping function
 * @returns {Generator<U, void, undefined>} A generator yielding mapped values
 * @example
 * const doubled = lazyMap([1, 2, 3], (n) => n * 2);
 * [...doubled]; // [2, 4, 6]
 */
export declare function lazyMap<T, U>(iterable: Iterable<T>, function_: (value: T, index: number) => U): Generator<U, void, undefined>;