declare class AsyncSubscription {
    private emitter;
    private listener;
    constructor(emitter: {
        unsubscribe(listener: (value: any) => Promise<void>): void;
    }, listener: (value: any) => Promise<void>);
    unsubscribe(): void;
}
declare class SyncSubscription {
    private emitter;
    private listener;
    constructor(emitter: {
        unsubscribe(listener: (value: any) => void): void;
    }, listener: (value: any) => void);
    unsubscribe(): void;
}
export { AsyncSubscription, SyncSubscription };