import type { HighlightHelper } from '../types/HighlightHelper';
/**
 * @internal
 * Create a HighlightHelper instance. A highlight helper manages the highlights in the editor
 * @param win The window object
 * @param styleKey The style key for the highlight
 * @returns The created HighlightHelper instance or undefined if the window does not support highlights
 */
export declare function createHighlightHelper(styleKey: string): HighlightHelper;