/**
 * Replaces a substring in the given text node with a replacement node.
 *
 * @param textNode
 *   The text node in which to replace the substring. This node will keep its place in the DOM and contain
 *   the text following the substring that was replaced, even if that text is empty.
 * @returns
 *   The offset in textNode following the substring to be replaced. If the splice succeeded, this will be 0.
 */
export declare function spliceTextNode(textNode: Text, offset: number, length: number, replacementNode: Node): number;