JS (ECMAScript 5.1) + CSS

gulpfile_js+css.js

// Gulp plugins
var gulp       = require('gulp'),
    minifyCSS  = require('gulp-csso'),
    concat     = require('gulp-concat'),
    sourcemaps = require('gulp-sourcemaps'),
    uglify     = require('gulp-uglify'),
    stripDebug = require('gulp-strip-debug');

// env variables
var front_folder = 'web',
    css_paths    = [
        'resources/assets/web/css/*/*.css',
        'resources/assets/web/css/*.css'
    ],
    js_paths     = [
        'resources/assets/web/js/script.js',
        'resources/assets/web/js/*.js',
        'resources/assets/web/js/*/*.js'
    ];

// CSS
gulp.task('css-dev', function () {
    return gulp.src(css_paths)
        .pipe(sourcemaps.init())
        .pipe(minifyCSS())
        .pipe(concat(front_folder + '.min.css'))
        .pipe(sourcemaps.write('./'))
        .pipe(gulp.dest('web/css/'))
});

gulp.task('css-prod', function () {
    return gulp.src(css_paths)
        .pipe(minifyCSS())
        .pipe(concat(front_folder + '.min.css'))
        .pipe(gulp.dest('web/css/'))
});

// JS
gulp.task('js-dev', function () {
    return gulp.src(js_paths)
        .pipe(sourcemaps.init())
        .pipe(concat(front_folder + '.min.js'))
        .pipe(sourcemaps.write('./'))
        .pipe(gulp.dest('web/js'))
});

gulp.task("js-prod", function () {
    return gulp.src(js_paths)
        .pipe(concat(front_folder + '.min.js'))
        .pipe(stripDebug())
        .pipe(gulp.dest('web/js'))
});

gulp.task('js-compress', function () {
    gulp.src(front_folder + '/js/web.min.js')
        .pipe(uglify())
        .pipe(gulp.dest('web/js'));
});

// Watchers
gulp.task('css:watch', function () {
    gulp.watch(css_paths, ['css-dev']);
});
gulp.task('js:watch', function () {
    gulp.watch(js_paths, ['js-dev']);
});

// Default
gulp.task('default', ['css-prod', 'js-prod']);