import { Entity, EntityConstructorOptions, Reference } from '../entities/entity.js';
export declare function isRelationship(value: unknown): value is Relationship;
export interface RelationshipConstructorOptions<F extends Entity = Entity, T extends Entity = Entity> extends EntityConstructorOptions {
    from?: Reference<F>;
    to?: Reference<T>;
}
export declare abstract class Relationship<F extends Entity = Entity, T extends Entity = Entity> extends Entity {
    _from: string;
    _to: string;
    constructor(data?: RelationshipConstructorOptions<F, T>);
    protected keySeed(): unknown;
}
//# sourceMappingURL=relationship.d.ts.map