import { TApiRouteDiscriminatedDtoProperties } from '../../../../type/decorator/api/route';
/**
 * Removes the discriminator property from a root DTO payload when the config requests it.
 * @param {TApiRouteDiscriminatedDtoProperties} properties - Route-level discriminated DTO config.
 * @param {unknown} payload - Payload selected by the discriminator.
 * @returns {unknown} Original or copied payload used for transformation/serialization.
 */
export declare function ApiRoutePrepareDiscriminatedDtoPayload(properties: TApiRouteDiscriminatedDtoProperties, payload: unknown): unknown;