/**
 * @description replace `highlight` -> `<mark>highlight</mark>` with with vanilla js.
 * @see: {@link https://www.eriwen.com/javascript/highlight-search-results-with-js/}
 * @category string
 * @example doHighlight('hello world', 'world')
 */
export declare const doHighlight: (original: string, highlight: string, callback?: ((substring: string, ...args: any[]) => string) | undefined) => string;