my gulp config

gulfile.js

/* 
 * https://github.com/gulpjs/gulp
 * http://code.tutsplus.com/tutorials/using-gulp-for-wordpress-automation--cms-23081
 * https://markgoodyear.com/2014/01/getting-started-with-gulp/
 * http://mattbanks.me/gulp-wordpress-development/
 * 
 */

var gulp = require('gulp'),
        through = require('gulp-through'),
        plumber = require('gulp-plumber'),
        notify = require('gulp-notify'),
        jshint = require('gulp-jshint'),
        jscs = require('gulp-jscs'),
        stylish = require('jshint-stylish'),
        concat = require('gulp-concat'),
        uglify = require('gulp-uglify'),
        imagemin = require('gulp-imagemin'),
        cache = require('gulp-cache'),
        sass = require('gulp-sass'),
        minifyCss = require('gulp-minify-css'),
        livereload = require('gulp-livereload');



gulp.task('watch', function () {

    livereload.listen();

    gulp.watch('sass/*.scss', ['sass']);
    gulp.watch('javascripts/*.js', ['js']);
    gulp.watch('images-source/*.{png,jpg,gif}', ['img']);

    gulp.watch('**/*.php', ['php']);

});


gulp.task('php', function () {

    return gulp.src('index.php')
            .pipe(notify("Hello Gulp!"))
            .pipe(livereload());

});


gulp.task('sass', function () {

    gulp.src('sass/*.scss')

            .pipe(plumber({errorHandler: notify.onError("SASS Error: <%= error.message %>")}))
            .pipe(sass())
            .pipe(minifyCss({compatibility: 'ie8', keepSpecialComments: 1}))
            .pipe(gulp.dest('css'))
            .pipe(livereload());

});


gulp.task('js', function () {

    return gulp.src('javascripts/*.js')

            .pipe(plumber())
            
            .pipe(jscs({fix: true, preset: "wordpress", }))
            .pipe(jshint())
            .pipe(jshint.reporter('jshint-stylish'))
            .pipe(jshint.reporter('fail'))
            .pipe(uglify())
            .pipe(concat('theme.min.js'))
            .pipe(gulp.dest(''))
            .pipe(livereload())

});


gulp.task('img', function () {

    gulp.src('images-source/*.{png,jpg,gif}')

            .pipe(plumber({errorHandler: notify.onError("Image Error: <%= error.message %>")}))
            .pipe(cache(imagemin({optimizationLevel: 5, progressive: true, interlaced: true})))
            .pipe(gulp.dest('images'))
            .pipe(livereload());

});

gulp.task('default', ['sass', 'js', 'img', 'watch']);