/**
 * Split a text node into two parts by an offset number, and return one of them
 * @param textNode The text node to split
 * @param offset The offset number to split at
 * @param returnFirstPart True to return the first part, then the passed in textNode will become the second part.
 * Otherwise return the second part, and the passed in textNode will become the first part
 */
export default function splitTextNode(textNode: Text, offset: number, returnFirstPart: boolean): Text;