I mean : is there a jQuery plugin which can check our code before launch it ?

Example:

I write this :

jQuery('.myclass')css('color','red');

The plugin will show me some message like 'parse error line ...' because I forgot a dot

Or :

function test() {
    alert('test');
...
tet();

Message: The tet() function doesn't exist.

So...

What you do think ?