import 'reflect-metadata';
import { Constructor } from '@cratis/fundamentals';
import { ProjectionId } from '../ProjectionId.js';
/**
 * Metadata stored on a declarative projection class.
 */
export interface ProjectionMetadata {
    /** The unique identifier for the projection. */
    readonly id: ProjectionId;
    /** The optional explicit event sequence identifier. */
    readonly eventSequenceId: string | undefined;
    /** The optional explicit read model constructor. */
    readonly readModelType: Constructor | undefined;
}
/**
 * TypeScript decorator that marks a class as a declarative projection.
 * @param id - The unique identifier for the projection. Defaults to the class name if omitted.
 * @param readModelType - Optional explicit read model constructor (needed when TypeScript generic inference is insufficient).
 * @param eventSequenceId - Optional explicit event sequence identifier.
 * @returns A class decorator.
 */
export declare function projection(id?: string, readModelType?: Constructor, eventSequenceId?: string): ClassDecorator;
/**
 * Gets the {@link ProjectionMetadata} associated with a class decorated with {@link projection}.
 * @param target - The class constructor to retrieve metadata for.
 * @returns The associated metadata, or undefined if not decorated.
 */
export declare function getProjectionMetadata(target: Function): ProjectionMetadata | undefined;
/**
 * Checks whether a class has been decorated with {@link projection}.
 * @param target - The class constructor to check.
 * @returns True if the class has a projection decorator; false otherwise.
 */
export declare function isProjection(target: Function): boolean;
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