/**
 * An object which can produce a reverse iterator over its values.
 */
export interface IRetroable<T> {
    /**
     * Get a reverse iterator over the object's values.
     *
     * @returns An iterator which yields the object's values in reverse.
     */
    retro(): IterableIterator<T>;
}
/**
 * Create an iterator for a retroable object.
 *
 * @param object - The retroable or array-like object of interest.
 *
 * @returns An iterator which traverses the object's values in reverse.
 *
 * #### Example
 * ```typescript
 * import { retro } from '@lumino/algorithm';
 *
 * let data = [1, 2, 3, 4, 5, 6];
 *
 * let stream = retro(data);
 *
 * Array.from(stream);  // [6, 5, 4, 3, 2, 1]
 * ```
 */
export declare function retro<T>(object: IRetroable<T> | ArrayLike<T>): IterableIterator<T>;