import { EraLike, Hash } from '@dedot/codecs';
import { SignerPayloadJSON } from '@dedot/types';
import { SignedExtension } from '../SignedExtension.js';
export declare const MAX_FINALITY_LAG: number;
export declare const FALLBACK_MAX_HASH_COUNT: number;
export declare const FALLBACK_PERIOD: number;
export declare const MORTAL_PERIOD: number;
/**
 * @description Check for transaction mortality.
 */
export declare class CheckMortality extends SignedExtension<EraLike, Hash> {
    #private;
    init(): Promise<void>;
    fromPayload(payload: SignerPayloadJSON): Promise<void>;
    toPayload(): Partial<SignerPayloadJSON>;
}