Syntax prob, UCE0001 error c#sharp to javascript

Hi,

though could someone point me to a tool or guide which explains briefly how to convert C#Sharp into javascript code for Unity?

In particular i struggle with this line of code :/

 Vector3 position = new Vector3(transform.position.x, transform.position.y + ProjectileOffset);
                 Instantiate(ProjectilePrefab, position, Quaternion.identity);

Thanks for your time + help

UPDATE

Testing now http://sharpkit.net (C# to JavaScript Converter) <--- not working

UPDATE

Thanks Eric.

I have now

 private var projectileOffset : Vector3; 
 private var position : Vector3; 
  
  
 var position = new position(transform.position.x, transform.position.y + projectileOffset);

But get BCE0051 Operator + cannot be used with a left hand side of type float and right hand side of type UnityEngine.Vector3