Function AnimatedTerminalTitle

src/screens/REPL.tsx:484–519

* Sets the terminal tab title, with an animated prefix glyph while a query * is running. Isolated from REPL so the 960ms animation tick re-renders only * this leaf component (which returns null — pure side-effect) instead of the * entire REPL tree. Before extraction, the tick was ~1 REPL render/s

(t0)

 * the duration of every turn, dragging PromptInput and friends along.
 */
function AnimatedTerminalTitle(t0) {
  const $ = _c(6);
  const {
    isAnimating,
    title,
    disabled,
    noPrefix
  } = t0;
  const terminalFocused = useTerminalFocus();
  const [frame, setFrame] = useState(0);
  let t1;
  let t2;
  if ($[0] !== disabled || $[1] !== isAnimating || $[2] !== noPrefix || $[3] !== terminalFocused) {
    t1 = () => {
      if (disabled || noPrefix || !isAnimating || !terminalFocused) {
        return;
      }
      const interval = setInterval(_temp2, TITLE_ANIMATION_INTERVAL_MS, setFrame);
      return () => clearInterval(interval);
    };
    t2 = [disabled, noPrefix, isAnimating, terminalFocused];
    $[0] = disabled;
    $[1] = isAnimating;
    $[2] = noPrefix;
    $[3] = terminalFocused;
    $[4] = t1;
    $[5] = t2;
  } else {
    t1 = $[4];
    t2 = $[5];
  }
  useEffect(t1, t2);
  const prefix = isAnimating ? TITLE_ANIMATION_FRAMES[frame] ?? TITLE_STATIC_PREFIX : TITLE_STATIC_PREFIX;
  useTerminalTitle(disabled ? null : noPrefix ? title : `${prefix} ${title}`);
  return null;
}
function _temp2(setFrame_0) {
  return setFrame_0(_temp);
}