If you insert the width property: calc(x - x); in an element with inline styles the application breaks, it also happens if you do object.nativeView.width = "calc(x - x)"

Works fine if put as styles of a class.

.bar{
   width: calc(x - x);
}

Sample project
https://play.nativescript.org/?template=play-vue&id=mncNi9&v=2

Note: with NS 8.1.x it also breaks the app