/**
 * The ChangesObserver module is an object that represents a disposable resource
 * provided by the ChangesObservable module.
 *
 * @class ChangesObserver
 */
export declare class ChangesObserver {
    #private;
    /**
     * Internal storage map for local hook callbacks, keyed by hook name.
     */
    _localHooks: Record<string, Function[]>;
    /**
     * Registers a callback function for the given local hook name.
     */
    addLocalHook: (key: string, callback: Function) => this;
    /**
     * Triggers all callbacks registered under the given local hook name.
     */
    runLocalHooks: (key: string, ...args: unknown[]) => void;
    /**
     * Removes all locally registered hook callbacks from this observer instance.
     */
    clearLocalHooks: () => this;
    /**
     * Subscribes to the observer.
     *
     * @param {Function} callback A function that will be called when the new changes will appear.
     * @returns {ChangesObserver}
     */
    subscribe(callback: Function): this;
    /**
     * Unsubscribes all subscriptions. After the method call, the observer would not produce
     * any new events.
     *
     * @returns {ChangesObserver}
     */
    unsubscribe(): this;
    /**
     * The write method is executed by the ChangesObservable module. The module produces all
     * changes events that are distributed further by the observer.
     *
     * @private
     * @param {object} changes The chunk of changes produced by the ChangesObservable module.
     * @returns {ChangesObserver}
     */
    _write(changes: unknown[]): this;
    /**
     * The write method is executed by the ChangesObservable module. The module produces initial
     * changes that will be used to notify new subscribers.
     *
     * @private
     * @param {object} initialChanges The chunk of changes produced by the ChangesObservable module.
     */
    _writeInitialChanges(initialChanges: unknown[]): void;
}