Function findLastTextNode

src/patch-streaming-html.ts:180–193

Deepest last text node under `root` (matches insertAdjacentText tail).

(root: Node)

/** Deepest last text node under `root` (matches insertAdjacentText tail). */
function findLastTextNode(root: Node): Text | null {
  if (root.nodeType === Node.TEXT_NODE) {
    const text = root as Text;
    return text.data.length > 0 ? text : null;
  }

  for (let i = root.childNodes.length - 1; i >= 0; i--) {
    const found = findLastTextNode(root.childNodes[i]!);
    if (found) {
      return found;
    }
  }
  return null;
}

function collapseRangeAtTextEnd(range: Range, text: Text): void {
  range.setStart(text, text.data.length);