import type { RequestHandler } from 'express';
import type { ValidationOptions } from '../types/options';
/**
 * Express middleware to validate a single image field.
 * @param { string } fieldName Name of the field to validate.
 * @param { ValidationOptions } [options] Validation options.
 * @returns { RequestHandler } Express middleware function.
 */
export declare function validateImageSingle(fieldName: string, options?: ValidationOptions): RequestHandler;