import { ApiPropertyOptions } from '@nestjs/swagger';
/**
 * Decorator factory to annotate content array properties with Swagger metadata,
 * input validation (minimum length of 1), and transformation logic.
 *
 * - Validates that the decorated property is a non-empty array.
 * - Transforms empty arrays into `undefined` to prevent saving invalid content.
 * - Adds Swagger documentation with the ability to override options.
 *
 * @returns {PropertyDecorator} - Combined decorator for Swagger, validation, and transformation.
 */
export declare function PropertyContent(): PropertyDecorator;
/**
 *
 * @param {ApiPropertyOptions} [options={}] - Optional Swagger property settings.
 * @returns
 */
export declare function ApiPropertyContent(options?: ApiPropertyOptions): PropertyDecorator;