message: fix: selObj init value
diff: @@ -65,7 +65,7 @@ function useTextSelection(target?: BasicTarget): IState {
  }
  const mouseupHandler = () => {
  - let selObj: Selection | null;
  + let selObj: Selection | null = null;
  let text = '';
  let rect = initRect;
  if (!window.getSelection) return;
  