export declare const _debounce: any;
export declare const _isEqual: any;
export declare const toPlainText: (text: string | undefined | null) => string;
export declare const getMarkdownHeader: (md: string | undefined | null) => {
    level: number;
    content: string;
}[];
/**
 * 判断节点在可视区域
 * @param el
 * @param partiallyVisible
 */
export declare const isVisibleInViewport: (el: HTMLElement, partiallyVisible?: boolean) => boolean;
export declare const _log: (group: string, data: any) => void;