It’s not an extension. It’s a few functions to convert from the isometric coordinates to the standard 2D x,y. I’m still working on it.
The isometric Pathfinder extension (not mine) is much more interesting.
This is an example that I made.
I have other versions somewhere if it interests you. You can also browse my github page. There’s a mix of all the example that I’ve made for various people. It’s basic stuff but interesting.