Whats wrong with this

foreach is a C# thing, use for instead

GameObject enemy won't work, use enemy : GameObject instead

I don't think you get List in JS. Use ArrayList instead. Likewise new ListTransform would be new ArrayList() instead.

The List declaration is wrong. You must import System.Generics.List, and declare the List as follows:

import System.Collections.Generic.List; public var targets: List.< Transform>; public var selectedTarget: Transform;

function Start(){ targets = new List.< Transform>(); ... And foreach doesn't exist in JS, as @DaveA said - it should be like this:

   for (var enemy: GameObject in go){

NOTE: The space after < isn't needed in the actual code - it's there just to prevent this site to eat all the text after the character <