export type Observer<T> = (newStatus: T) => any;
/**
 * Class that manages a set of observers that are notified when a new
 * even is emitted.
 */
export declare class ObserverManager<T> {
    private observers;
    constructor();
    /**
     * Adds an observer that will be called each time an event is emitted.
     * @param observer - The observer to be called.
     */
    addObserver(observer: Observer<T>): void;
    /**
     * Removes an observer so that it will not be called when an event is emitted.
     * @param observer - The observer to be removed.
     */
    removeObserver(observer: Observer<T>): void;
    /**
     * Removes all the observers.
     */
    removeAll(): void;
    /**
     * Notifies the observers.
     * @param newStatus - The emitted event.
     */
    emit(newStatus: T): void;
}