/**
 * Observable base class implementing the Observer pattern for reactive widgets.
 *
 * Provides data change notification system allowing subscribers to react to state updates.
 */
export declare class BaseObserver {
    /** Widget data that can be observed for changes */
    data: any;
    /** Flag to enable development mode features */
    inDevelopment: boolean;
    /** Array of callback functions subscribed to data changes */
    subscribers: any;
    /**
    * Notifies all subscribers when data changes.
    *
    * @param passedData - Optional data to pass to subscribers. Uses this.data if not provided.
    */
    notify(passedData?: any): void;
    /**
     * Registers a callback function to be invoked on data changes.
     *
     * @param callback - Function to execute when data changes
     */
    dataChange(callback: any): void;
}