Unfortunately there is good way currently to make it.
You have to use different workarounds.

For example you can add additional function to controller:
function some_function() {
header(‘Content-Type: text/javascript; charset=utf-8′);
require_once(‘PATH_TO_YOUR_JS’);
die();
}

And then add it to your page:
$variable = JFactory::getDocument();
$variable->addScript(JRoute::_(‘index.php?option=com_SOME_COM_OBJECT&task=some_function’, false));

Great site for some quick hints on developing for Joomla.

I am curious though. I am trying to internationalize my javascripts, without adding extra javascript declarations, eg I would like to avoid using javascript for internationalizing labels.

This is what I would like to avoid:
$doc = JFactory::getDocument();
$doc->addScriptDeclaration(‘window.mymodname = {
label1: “‘.JText::_(‘MOD_MYMODNAME_LABEL1′).’”,
label2: “‘.JText::_(‘MOD_MYMODNAME_LABEL2′).’”
};’);

I want to be able to use my Jtext in my javascripts plain and simple, but it seems Joomla won’t let me.
I’m guessing Joomla won’t parse javascriptfiles, hence the Jtext won’t be read.

Maybe I´m going about it the wrong way, maybe I should be looking at the construction of the javascript instead?

Cheers