import * as $ from '@dedot/shape';
import { SignerPayloadJSON, SignerPayloadRaw } from '@dedot/types';
import { HexString } from '@dedot/utils';
import { SignedExtension } from './SignedExtension.js';
export declare class ExtraSignedExtension extends SignedExtension<any[], any[]> {
    #private;
    init(): Promise<void>;
    fromPayload(payload: SignerPayloadJSON): Promise<void>;
    get identifier(): string;
    get $Data(): $.AnyShape;
    get $AdditionalSigned(): $.AnyShape;
    get $Payload(): $.AnyShape;
    /**
     * Check if the extension requires no external inputs (e.g: struct or tuple with empty types like `()` or `[]`)
     * @param extDef - The definition of the signed extension
     * @returns boolean
     */
    private isRequireNoExternalInputs;
    toPayload(call?: HexString | string): SignerPayloadJSON;
    toRawPayload(call?: HexString | string): SignerPayloadRaw;
}