ModelControllerT, U Class

public class ModelController<T, U> : ApiController
where T : class, new(), U
where U : class, new()

Public Class ModelController(Of T As {Class, New, U}, U As {Class, New})
	Inherits ApiController

generic<typename T, typename U>
where T : ref class, gcnew(), U
where U : ref class, gcnew()
public ref class ModelController : public ApiController

type ModelController<'T, 'U when 'T : not struct, new() and 'U when 'U : not struct, new()> = 
    class
        inherit ApiController
    end

JavaScript does not support generic types or methods.