gulpfile.js

/**
 * Gulpfile
 *
 * Rename and Minify JavaScript... and more (later).
 *
 * Install Command:
 * npm install gulp gulp-rename gulp-uglify
 */

var gulp   = require('gulp');
var rename = require('gulp-rename');
var uglify = require('gulp-uglify');
var requirejsOptimize = require('gulp-requirejs-optimize');
var sass = require('gulp-sass');
var sourcemaps = require('gulp-sourcemaps');
var autoprefixer = require('gulp-autoprefixer');

gulp.task('js', function () {
    gulp.src('assets/js/builder/main.js')
    .pipe(sourcemaps.init())
    .pipe(requirejsOptimize(function(file) {
        return {
            name: '../lib/almond',
            optimize: 'uglify2',
            wrap: true,
            baseUrl: 'assets/js/builder/',
            include: ['main'],
            preserveLicenseComments: false
        };
    }))
    .pipe(rename('builder.js'))
    .pipe(sourcemaps.write('/'))
    .pipe(gulp.dest('assets/js/min/'));

    gulp.src('assets/js/front-end/main.js')
    .pipe(sourcemaps.init())
    .pipe(requirejsOptimize(function(file) {
        return {
            name: '../lib/almond',
            optimize: 'uglify2',
            wrap: true,
            baseUrl: 'assets/js/front-end/',
            include: ['main'],
            preserveLicenseComments: false
        };
    }))
    .pipe(rename('front-end.js'))
    .pipe(sourcemaps.write('/'))
    .pipe(gulp.dest('assets/js/min/'));
});

gulp.task('sass', function () {
    gulp.src('assets/scss/admin/builder.scss')
    .pipe(sourcemaps.init())
    .pipe(sass().on('error', sass.logError))
    .pipe(autoprefixer())
    .pipe(sourcemaps.write('/'))
    .pipe(gulp.dest('assets/css'));

    gulp.src('assets/scss/front-end/display-structure.scss')
    .pipe(sourcemaps.init())
    .pipe(sass().on('error', sass.logError))
    .pipe(autoprefixer())
    .pipe(sourcemaps.write('/'))
    .pipe(gulp.dest('assets/css'));

    gulp.src('assets/scss/front-end/display-opinions.scss')
    .pipe(sourcemaps.init())
    .pipe(sass().on('error', sass.logError))
    .pipe(autoprefixer())
    .pipe(sourcemaps.write('/'))
    .pipe(gulp.dest('assets/css'));

    gulp.src('assets/scss/front-end/display-opinions-light.scss')
    .pipe(sourcemaps.init())
    .pipe(sass().on('error', sass.logError))
    .pipe(autoprefixer())
    .pipe(sourcemaps.write('/'))
    .pipe(gulp.dest('assets/css'));

    gulp.src('assets/scss/front-end/display-opinions-dark.scss')
    .pipe(sourcemaps.init())
    .pipe(sass().on('error', sass.logError))
    .pipe(autoprefixer())
    .pipe(sourcemaps.write('/'))
    .pipe(gulp.dest('assets/css'));
});

// Watch Files For Changes
gulp.task('watch', function() {
    gulp.watch('assets/js/builder/**/*.js', ['js']);
    gulp.watch('assets/js/front-end/**/*.js', ['js']);
    gulp.watch('assets/scss/**/*.scss', ['sass']);
});

// Default Task
gulp.task('default', ['js', 'sass', 'watch']);

function swallowError (error) {
    //If you want details of the error in the console
    console.log(error.toString());
    this.emit('end');
}