Is there an opposite of 'RequireComponent'?

Questions & Answers
1

Can I prevent a certain script from being attached to a certain game object?

2

Hmm that is a nice question!

Let us say we want do not want to allow user to attach component CompA to a GameObject if CompB is already attached. Try this :

private void Awake()
{
        if (this.getComponent<CompB>() != null)
        {
                 Debug.LogError("You can not attach CompA if CompB is attached too");
                 Destroy(GetComponent<CompA>());
        }
}