import type { PrimaryFieldType } from "../../core";
import type { Entity, EntityManager } from "../entities";
import { type EntityRelation, RelationField } from "../relations";
export type MutationInstructionResponse = [string, PrimaryFieldType | null];
export declare class RelationMutator {
    protected entity: Entity;
    protected em: EntityManager<any>;
    constructor(entity: Entity, em: EntityManager<any>);
    /**
     * Returns all keys that are somehow relational.
     * Includes local fields (users_id) and references (users|author)
     *
     * @param em
     * @param entity_name
     *
     * @returns string[]
     */
    getRelationalKeys(): string[];
    persistRelationField(field: RelationField, key: string, value: PrimaryFieldType): Promise<MutationInstructionResponse>;
    persistReference(relation: EntityRelation, key: string, value: unknown): Promise<void | MutationInstructionResponse>;
    persistRelation(key: string, value: unknown): Promise<void | MutationInstructionResponse>;
}