message: Fix(#725) type error
diff: @@ -672,15 +672,15 @@ class Element<Props extends ElementProps = ElementProps> {
  return true;
  }
  - protected getInsideTextFill(): string {
  + protected getInsideTextFill(): string | undefined {
  return '#fff';
  }
  - protected getInsideTextStroke(textFill: string): string {
  + protected getInsideTextStroke(textFill: string): string | undefined {
  return '#000';
  }
  - protected getOutsideFill() {
  + protected getOutsideFill(): string | undefined {
  return this.__zr && this.__zr.isDarkMode() ? LIGHT_LABEL_COLOR : DARK_LABEL_COLOR;
  }
  