/**
 * Compares two pieces of HTML content and returns the combined content with differences
 * wrapped in <ins> and <del> tags.
 * @param before The HTML content before the changes.
 * @param after The HTML content after the changes.
 * @param className (Optional) The class attribute to include in `<ins>` and `<del>` tags.
 * @param dataPrefix (Optional) The data prefix to use for data attributes. The operation index data
 * attribute will be named `data-${dataPrefix-}operation-index`.
 * @param atomicTags (Optional) Comma separated list of tag names. The list has to be in the form
 * `tag1,tag2,...` e. g. `head,script,style`. An atomic tag is one whose child nodes should not be
 * compared - the entire tag should be treated as one token. This is useful for tags where it does
 * not make sense to insert `<ins>` and `<del>` tags. If not used, the default list 
 * `iframe,object,math,svg,script,video,head,style` will be used.
 * @return The combined HTML content with differences wrapped in `<ins>` and `<del>` tags.
 */
declare function diff(before: string, after: string, className?: string | null, dataPrefix?: string | null, atomicTags?: string | null): string;
export = diff;