/**
 * Registers a DOM element ref and an ECharts instance ref with the widget store.
 * This allows other parts of the application (e.g., screenshot export) to access the widget's DOM element.
 *
 * @param widgetId - The widget ID to register the refs under.
 * @returns An object with `ref` (DOM element) and `instance` (ECharts instance) refs.
 *
 * @example
 * ```tsx
 * function MyWidget({ id }: { id: string }) {
 *   const { ref } = useWidgetRef<HTMLDivElement>(id)
 *
 *   return <div ref={ref}>Widget content</div>
 * }
 * ```
 */
export declare function useWidgetRef<T extends HTMLElement = HTMLElement>(widgetId: string): {
    ref: import('react').RefObject<T | null>;
    instance: import('react').RefObject<import('node_modules/echarts').ECharts | null>;
};