import { type PaymentFlowFactory } from './flows';
import type { ListReaderParams, PaymentAction, PaymentPayParams, PaymentRefundParams, PaymentRequestClient, PaymentSession, PaymentSessionCreateOptions } from './types';
/** V2 的薄 Session：只做 Flow 选路、实例持有与方法转发。 */
export declare class PaymentSessionImpl implements PaymentSession {
    readonly sessionId: string;
    private readonly request;
    private readonly options;
    private readonly flowFactory;
    private readonly onDestroy?;
    private activeFlow?;
    private active;
    private succeeded;
    private destroyed;
    private lockedOperation?;
    private flowGeneration;
    private readerController?;
    constructor(sessionId: string, request: PaymentRequestClient, options: PaymentSessionCreateOptions, onDestroy?: (session: PaymentSessionImpl) => void, flowFactory?: PaymentFlowFactory);
    listReader(params?: ListReaderParams): void;
    pay(params: PaymentPayParams): void;
    refund(params: PaymentRefundParams): void;
    action(action: PaymentAction, inputValues?: Record<string, string>): void;
    destroy(): void;
    private start;
    private handleFlowEvent;
    private assertUsable;
    private releaseFlow;
    private emit;
}
export declare const createSessionId: () => string;