import { ValidationRule } from './types';
/**
 * Registers a property in the metadata registry for schema generation.
 * Ensures each property is only registered once.
 *
 * @param target - The target object (typically the class prototype)
 * @param propertyKey - The property symbol
 */
export declare function registerProperty(target: Object, propertyKey: string | symbol): void;
/**
 * Adds a validation rule to a property's metadata.
 *
 * @param target - The target object
 * @param propertyKey - The property to validate
 * @param rule - The validation rule to add
 *
 * @example
 * ```typescript
 * addValidationRule(user, 'age', {
 *   type: 'minimum',
 *   params: [0]
 * });
 * ```
 */
export declare function addValidationRule(target: Object, propertyKey: string | symbol, rule: ValidationRule): void;