import { ObserveCallback } from "./observe";
/**
 * Convert graph data change into an observable Grove variable.
 * @category Events
 * @since 0.0.249
 * @example
 * ```js
 * personaNodes = onChange(
 *   () => api.getLayoutGraph().getNodes().filter(api.nodesByCategory('Persona'))
 * )
 * ```
 */
export declare const onChange: <T>(cb: ObserveCallback) => Iterator<T, any, undefined>;