import { Knex } from 'knex';
/**
 * Checks whether a refresh state exists for the given entity that has a
 * location key that does not match the provided location key.
 *
 * @returns The conflicting key if there is one.
 */
export declare function checkLocationKeyConflict(options: {
    tx: Knex.Transaction;
    entityRef: string;
    locationKey?: string;
}): Promise<string | undefined>;