export type RestartSource = 'slash' | 'card';
export type RestartTerminalStatus = 'succeeded' | 'failed' | 'timed_out';
export type RestartObserverStatus = 'in_progress' | RestartTerminalStatus;
export interface RestartObserver {
    source: RestartSource;
    notify(status: RestartObserverStatus): void | Promise<void>;
}
export declare class RestartCoordinator {
    private readonly options;
    private readonly attempts;
    private readonly notifications;
    constructor(options?: {
        timeoutMs?: number;
        createAttemptId?: () => string;
    });
    request(sessionId: string, observer: RestartObserver, startPhysicalRestart: (attemptId: string) => void | Promise<void>): {
        attemptId: string;
        joined: boolean;
    };
    resolve(sessionId: string, attemptId: string, status: RestartTerminalStatus): boolean;
    failSession(sessionId: string): boolean;
    cancelSession(sessionId: string): boolean;
    activeAttemptId(sessionId: string): string | undefined;
    reset(): void;
    private notify;
    private enqueueNotify;
}
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