import type { RequestHandler } from 'express';
import type { FieldSet } from '../types/field';
/**
 * Middleware for validating uploaded images in `req.files`.
 * @param { FieldSet } field Single field name, field object, or array of them to validate.
 * @returns { RequestHandler } Express middleware function that validates uploaded image fields.
 */
/**
 * Express middleware to validate multiple image fields.
 * @param { FieldSet } field Single field or array of field schemas to validate.
 * @returns { RequestHandler } Express middleware function.
 */
export declare function validateImage(field: FieldSet): RequestHandler;