Node js less compiler

nodejs.js

var fs					= require('fs'),
		less				= require('less'),
		compressor	= require('node-minify'),
		directory		= 'bootstrapless/',
		rootLess		= 'bootstrap.less';

var parser = new(less.Parser)({
	paths: 		[directory] // Specify search paths for @import directives
});

fs.watch(directory, onFileEvent);

// Below this line we find only functions


/**
 * Called when an event occurs on a file inside the watched directory
 * @param event the event ( String ) 
 * @param filename the filename ( withouth abs path ) 
 */
function onFileEvent(event, filename) {
	if (event == 'change') {
		if ( /[a-zA-Z]+\.less$/.test(filename)) {
			fs.readFile(directory+rootLess, 'ascii', onFileRead);
		} 
	}
}

/**
 * Called when the readFile ended to read the file
 * @param err
 * @param data
 */
function onFileRead(err, data) {
	if (err){
		throw err;
	}
	parser.parse(data, onLessParsed);
}

function onLessParsed (e, tree) {
	if (e) {
		throw e;
	}
	try {
		var outCss = tree.toCSS({compress:false});
		var outFile = directory+"out/"+rootLess.replace('.less','.css'); 
		fs.writeFile(outFile, tree.toCSS({compress:false}), function (err) {
			onFileWritten(err, outFile);
		} );
	} catch (e) {
		console.log(e.filename+"["+e.line+"]: "+e.message);
	}
}

/**
 * On File written to css
 * @param err
 */
function onFileWritten (err, outFile) {
	if (err) throw err;
	console.log(outFile+" Saved!");
	
	new compressor.minify({
		type: 'yui-css',
		fileIn: outFile,
		fileOut: outFile.replace('.css','.min.css')
	});

}