import type { MongoModel, MongoModelConstructor } from '../model/base_model.js';
/**
 * Base relation class for MongoDB relationships
 */
export declare abstract class BaseRelation {
    /**
     * The related model
     */
    protected relatedModel: MongoModelConstructor;
    /**
     * The owner model
     */
    protected ownerModel: MongoModel;
    /**
     * The local key on the owner model
     */
    protected localKey: string;
    /**
     * The foreign key on the related model
     */
    protected foreignKey: string;
    /**
     * Whether the relation is already booted
     */
    protected booted: boolean;
    constructor(relatedModel: MongoModelConstructor, ownerModel: MongoModel, foreignKey?: string, localKey?: string);
    /**
     * Boot the relation
     */
    boot(): void;
    /**
     * Get the local key value
     */
    getLocalKeyValue(): any;
    /**
     * Convert a value to ObjectId if needed
     */
    protected ensureObjectId(value: any): any;
    /**
     * Execute the relation query
     */
    abstract exec(): Promise<any>;
}