import { SignerPayloadJSON } from '@dedot/types';
import { SignedExtension } from '../SignedExtension.js';
/**
 * @description Ensure the runtime version registered in the transaction is the same as at present.
 */
export declare class CheckSpecVersion extends SignedExtension<{}, number> {
    init(): Promise<void>;
    fromPayload(payload: SignerPayloadJSON): Promise<void>;
    toPayload(): Partial<SignerPayloadJSON>;
}