import 'reflect-metadata';
import { Constructor } from '@cratis/fundamentals';
import { EventType } from '../EventType.js';
/**
 * Metadata stored on an event type migration class.
 */
export interface EventTypeMigrationMetadata {
    /** The upgraded (newer) event type represented by this migration. */
    readonly eventType: EventType;
    /** The previous (older) event type this migration migrates from. */
    readonly previousEventType: EventType;
}
/**
 * Decorator that marks a class as an event type migration between two generations
 * of the same event type.
 * @param upgradedType - The upgraded event type constructor.
 * @param previousType - The previous event type constructor.
 * @returns A class decorator.
 */
export declare function eventTypeMigration(upgradedType: Constructor, previousType: Constructor): ClassDecorator;
/**
 * Gets the {@link EventTypeMigrationMetadata} associated with a class decorated with {@link eventTypeMigration}.
 * @param target - The class constructor to retrieve the metadata for.
 * @returns The associated metadata, or undefined if not decorated.
 */
export declare function getEventTypeMigrationMetadata(target: Function): EventTypeMigrationMetadata | undefined;
/**
 * Checks whether a class has been decorated with {@link eventTypeMigration}.
 * @param target - The class constructor to check.
 * @returns True if the class has migration metadata; false otherwise.
 */
export declare function isEventTypeMigration(target: Function): boolean;
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