Recently I did a pull request into less.js, but the project owner (cloudhead) have already got 80+other requests so I publish here one solution for an issue in this framework:

When you call less.watch() in production environment or with the hash mark -> it just does not work. Feature or bug dunno. But:

Many people trying to do this:

<script type="text/javascript" src="less-1.2.2.js"></script>
<script type="text/javascript">
	// <![CDATA[
		less.env = "development";
		less.watch();
	// ]]>
</script>

but they do not realize that less.env line is ignored (because less.js loaded itself right before that line), and that variable is auto set up based on your URL (localhost/127.0.0.1,file:///,etc). Which is not always useful.

For example I work on localhost with a http://projects.local/... host name so there the less.watch() wont work.

I added a bit code to the browser.js.
https://github.com/zsitro/less.js/commit/696c9ec034b373c63e7e734d7ebb9b0be04e8ca0

EFFECT: less.watch() can be called from hash or from script tag even in production env.

Now this will function as follows:

<script type="text/javascript" src="less-1.2.2.js"></script>
<script type="text/javascript">
	// <![CDATA[
		//less.env = "development"; ITS JUST DUMB
		less.watch();
	// ]]>
</script>

Also fixed: missing clearInterval @ less.unwatch(). Its weird that less.js does not kill the timer, but check the less.watchMode true/false in the loop :D
Hope you guys like it.

Anyway, after using less.js I switched to lessPHP. Its much faster and reliable, than the javascript compiler. I will write about it later.