Method swap

src/utils.ts:751–754

swap the given object 2 field values

(o: unknown, a: string, b: string)

  /** swap the given object 2 field values */
  public static swap(o: unknown, a: string, b: string): void {
    if (!o) return;
    const tmp = o[a]; o[a] = o[b]; o[b] = tmp;
  }

  /** returns true if event is inside the given element rectangle */
  // Note: Safari Mac has null event.relatedTarget which causes #1684 so check if DragEvent is inside the coordinates instead