Gulp config for a simple frontend development process

gulpfile.js

var gulp = require('gulp');
var clean = require('gulp-clean');
var replace = require('gulp-replace');
var concat = require('gulp-concat-css');
var watch = require('gulp-watch');
var batch = require('gulp-batch');
var plumber = require('gulp-plumber');
var csscomb = require('gulp-csscomb');

var BUILD_DIR = '../done';

// CSS files
var VENDOR = [
    'css/vendor/bootstrap.min.css',
    'css/vendor/bootstrap-theme.min.css',
    'css/vendor/font-awesome.min.css'
];
var PROJECT = [
    'css/base/base.css',
    'css/base/layout.css',
    'css/base/state.css',
    'css/module/*.css'
];
var ALL = VENDOR.concat(PROJECT);

// Build process tasks
gulp.task('clean', function () {
    return gulp.src(BUILD_DIR, {read: false})
        .pipe(clean({force: true}));
});

gulp.task('build', ['clean'], function () {
    gulp.start('build:css');
    gulp.start('build:images');
    gulp.start('build:html');
    gulp.start('build:js');
    gulp.start('build:fonts');
});

gulp.task('build:css', function () {
    return gulp.src(ALL)
        .pipe(concat('bundle.css', {inlineImports: false, rebaseUrls: false}))
        .pipe(replace('/images/', 'images/'))
        .pipe(replace('/fonts/', 'fonts/'))
        .pipe(gulp.dest(BUILD_DIR));
});

gulp.task('build:images', function () {
    return gulp.src('images/**/*', {base: '.'})
        .pipe(gulp.dest(BUILD_DIR));
});

gulp.task('build:html', function () {
    return gulp.src('*.html')
        .pipe(replace('/images/', 'images/'))
        .pipe(replace('/js/', 'js/'))
        .pipe(gulp.dest(BUILD_DIR));
});

gulp.task('build:js', function () {
    return gulp.src('js/**/*', {base: '.'})
        .pipe(gulp.dest(BUILD_DIR));
});

gulp.task('build:fonts', function () {
    return gulp.src('fonts/**/*', {base: '.'})
        .pipe(gulp.dest(BUILD_DIR));
});

// Development tasks
gulp.task('concat', function () {
    gulp.src(ALL)
        .pipe(plumber())
        .pipe(concat('bundle.css', {inlineImports: false, rebaseUrls: false}))
        .pipe(gulp.dest('.'));
});

gulp.task('watch', function () {
    watch(ALL, batch(function (events, done) {
        gulp.start('concat', done);
    }));
});

gulp.task('csscomb', function () {
    gulp.src(PROJECT, {base: './css'})
        .pipe(csscomb('./node_modules/csscomb/config/zen.json'))
        .pipe(gulp.dest('css'));
});