export declare class Subscribable<TArgs, TListener extends (obj: TArgs) => unknown = (obj: TArgs) => unknown> {
    protected _listeners: Set<TListener>;
    /**
     * Subscribe to the subscribable.
     *
     * @param listener - The listener to subscribe to.
     * @returns A function to unsubscribe from the subscribable.
     */
    subscribe: (listener: TListener) => (() => void);
    /**
     * Notify all listeners.
     *
     * @param update - The update to notify listeners with.
     */
    notify: (update: TArgs) => void;
    hasListeners: () => boolean;
    /**
     * Unsubscribe all listeners.
     */
    cleanup: () => void;
}
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