gulpfile.js

// Assigning modules to local variables
var gulp        = require('gulp');
var sass        = require('gulp-sass');
var header      = require('gulp-header');
var cleanCSS    = require('gulp-clean-css');
var rename      = require("gulp-rename");
var uglify      = require('gulp-uglify');
var browserSync = require('browser-sync').create();
var pkg         = require('./package.json');

// Set the banner content
var banner = ['/*!\n',
    ' * Start Bootstrap - <%= pkg.title %> v<%= pkg.version %> (<%= pkg.homepage %>)\n',
    ' * Copyright 2016-' + (new Date()).getFullYear(), ' <%= pkg.author %>\n',
    ' * Licensed under <%= pkg.license.type %> (<%= pkg.license.url %>)\n',
    ' */\n',
    ''
].join('');

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

// scss task to compile the less files and add the banner
gulp.task('scss', function() {
    return gulp.src('styles/scss/main.scss')
        .pipe(sass())
        .pipe(header(banner, { pkg: pkg }))
        .pipe(gulp.dest('css'))
        .pipe(browserSync.reload({
            stream: true
        }))
});

// Minify CSS
gulp.task('minify-css', function() {
    return gulp.src('css/main.css')
        .pipe(cleanCSS({ compatibility: 'ie8' }))
        .pipe(rename({ suffix: '.min' }))
        .pipe(gulp.dest('css'))
        .pipe(browserSync.reload({
            stream: true
        }))
});

// Minify JS
gulp.task('minify-js', function() {
    return gulp.src('js/main.js')
        .pipe(uglify())
        .pipe(header(banner, { pkg: pkg }))
        .pipe(rename({ suffix: '.min' }))
        .pipe(gulp.dest('js'))
        .pipe(browserSync.reload({
            stream: true
        }))
});
// Configure the browserSync task
gulp.task('browserSync', function() {
    browserSync.init({
        server: {
            baseDir: ''
        },
    })
})

// Watch Task that compiles LESS and watches for HTML or JS changes and reloads with browserSync
gulp.task('dev', ['browserSync', 'scss', 'minify-css', 'minify-js'], function() {
    gulp.watch('styles/scss/*.scss', ['scss']);
    gulp.watch('css/*.css', ['minify-css']);
    gulp.watch('js/*.js', ['minify-js']);
    // Reloads the browser whenever HTML or JS files change
    gulp.watch('*.html', browserSync.reload);
    gulp.watch('js/**/*.js', browserSync.reload);
});