import 'reflect-metadata';
import { ConstraintId } from './ConstraintId.js';
/**
 * Metadata stored on a constraint class.
 */
export interface ConstraintMetadata {
    /** The unique identifier for the constraint. */
    readonly id: ConstraintId;
}
/**
 * TypeScript decorator that marks a class as an event constraint.
 * The decorated class may implement {@link IConstraint} to define the constraint rules.
 * @param id - The unique identifier for the constraint. Defaults to the class name if omitted.
 * @returns A class decorator.
 */
export declare function constraint(id?: string): ClassDecorator;
/**
 * Gets the {@link ConstraintMetadata} associated with a class decorated with {@link constraint}.
 * @param target - The class constructor to retrieve metadata for.
 * @returns The associated metadata, or undefined if not decorated.
 */
export declare function getConstraintMetadata(target: Function): ConstraintMetadata | undefined;
/**
 * Checks whether a class has been decorated with {@link constraint}.
 * @param target - The class constructor to check.
 * @returns True if the class has a constraint decorator; false otherwise.
 */
export declare function isConstraint(target: Function): boolean;
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