import { BaseRelation } from './base_relation.js';
import type { MongoModel, MongoModelConstructor } from '../model/base_model.js';
/**
 * BelongsTo relationship for MongoDB
 */
export declare class BelongsTo extends BaseRelation {
    constructor(relatedModel: MongoModelConstructor, ownerModel: MongoModel, foreignKey?: string, localKey?: string);
    /**
     * Set up the relationship
     */
    setup(): Promise<void>;
    /**
     * Execute the relation query
     */
    exec(): Promise<MongoModel | null>;
    /**
     * Associate a model
     */
    associate(related: MongoModel): Promise<void>;
    /**
     * Dissociate the relationship
     */
    dissociate(): Promise<void>;
}