type MessageHandler = (event: MessageEvent) => void;
export declare class WebviewClient {
    private readonly handlers;
    private readonly store;
    private isLoginInitiated;
    private readonly handleLoginCancelled;
    constructor({ onLoginCancelled }: {
        onLoginCancelled: () => Promise<void>;
    });
    startListening(): void;
    stopListening(): void;
    registerEvent(type: string, handler: MessageHandler): void;
    unregisterEvent(type: string): void;
    private handleMessage;
    private login;
    private handshake;
    private signMessage;
    private signTransactions;
}
export {};