Adding Script as GameObject

Unity Engine
1

Is there a reason I can’t add one of my JS files as a game object ? I have this :

var cameraMode : GameObject;

But when I go back to Unity, I cannot drag the cameraMode.js on to the variable.

2

A script is not a gameObject, it is a component.

In C# you can use a script as a variable class.

someScript scriptAccessor;