import type { ValidationOptions } from 'class-validator';
/** @hidden */
export declare const MAP_SIZE = "mapSize";
/**
 * Checks if the given value is a [Map](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map)
 * with a size of exactly `size`.
 *
 * #### Example
 * ```typescript
 * // Ensure the map has exactly 5 entries.
 * @MapSize(5)
 * values: Map<string, string>
 * ```
 *
 * @category Map
 * @param size The allowed size of the map.
 * @param options Generic class-validator options.
 */
export declare function MapSize(size: number, options?: ValidationOptions): PropertyDecorator;