gulp watch less

gulpfile.js

var gulp = require('gulp');
var watch = require("gulp-watch");
var less = require('gulp-less');
var path = require('path');
var rename = require('gulp-rename');
var plumber = require('gulp-plumber');
var color = require('gulp-color');
var gutil = require('gulp-util');

var rootPath = './aa/';

gulp.task('watch', function() {
	return	gulp
	.src(rootPath+'**/*.less')
	.pipe(watch(rootPath+'**/*.less'))
	.pipe(plumber())
	.pipe(less())
	.pipe(rename(function (path) {
		path.dirname = path.dirname.replace(/less$/,'css');
		path.extname = ".css";
		gutil.log('saved to '+color(path.dirname,'GREEN')+'/'+color(path.basename,'BLUE')+color(path.extname,'RED'));
	}))
	.pipe(gulp.dest('./'));
});

gulp.task('default',function(){
	gulp.start(['watch']);
})

package.json

{
"name": "gulp-less-watcher",
"version": "1.0.0",
"description": "",
"main": "gulpfile.js",
"dependencies": {
	"gulp-plumber": "^1.1.0",
	"gulp-rename": "^1.2.2",
	"gulp": "^3.9.1",
	"gulp-color": "0.0.1",
	"gulp-less": "^3.3.0",
	"gulp-plumber": "^1.1.0",
	"gulp-rename": "^1.2.2",
	"gulp-util": "^3.0.8",
	"gulp-watch": "^4.3.11"
},
"scripts": {
	"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC"
}