import type { DataSource, EntityTarget, ObjectLiteral } from 'typeorm';
type EntityUniquenessCheckOptions<T> = {
    entityTarget: EntityTarget<T>;
    entity: Partial<T>;
    entityExisting?: Partial<T>;
    dataSource?: DataSource;
};
/**
 * Check if a given entity does not already exist.
 * Composite unique keys on a null column can only be present once.
 *
 * @experimental
 * @param options
 */
export declare function isEntityUnique<T extends ObjectLiteral>(options: EntityUniquenessCheckOptions<T>): Promise<boolean>;
export {};