import type { FieldRule } from "../Decorator/FieldRule";
/**
 * Registers a validation rule for a class field.
 * @param target - The class prototype receiving the rule.
 * @param propertyKey - The field the rule applies to.
 * @param rule - The rule to register.
 */
export declare const addFieldRule: (target: object, propertyKey: PropertyKey, rule: FieldRule) => void;