import { Nullable } from "../../../base-types";
import { IRelation } from "../relation";
/**
 * Base interface for relation that are associated with only one entity.
 */
export interface IToOneRelation extends IRelation {
    /**
     * Gets the value of the relation.
     * @returns An id or null.
     */
    getId(): Nullable<number>;
    /**
     * Sets the value of the relation.
     * @param id - The id to set (or null)
     * @throws The id must be strictly positive.
     */
    setId(id: Nullable<number>): void;
    /**
     * Sets the value of the relation.
     * @param identifier - The identifier to set (or null)
     */
    setIdentifierAsync(identifier: Nullable<string>): Promise<void>;
}