Function cleanup

examples/annotations/main.ts:299–306

()

  let cleanedUp = false;
  const cleanup = (): void => {
    if (cleanedUp) return;
    cleanedUp = true;
    window.removeEventListener('beforeunload', cleanup);
    modeToggle.checkbox.removeEventListener('change', onToggleChange);
    modeToggle.host.remove();
    disposeChart();
  };

  window.addEventListener('beforeunload', cleanup);
  import.meta.hot?.dispose(cleanup);