gulp file with browser-sync, minify css, js, and image-optimization to dist folders

gulpfile.js

"use strict";

var gulp = require('gulp');
var browserSync = require('browser-sync').create();
var header = require('gulp-header');
var cleanCSS = require('gulp-clean-css');
var rename = require("gulp-rename");
var uglify = require('gulp-uglify');
var pkg = require('./package.json');
var imageop = require('gulp-image-optimization');
var uncss = require('gulp-uncss');
// var browserify = require('gulp-browserify');

// Set the banner content
var banner = ['/*!\n',
    ' * Start Bootstrap - <%= pkg.title %> v<%= pkg.version %> (<%= pkg.homepage %>)\n',
    ' * Copyright 2013-' + (new Date()).getFullYear(), ' <%= pkg.author %>\n',
    ' */\n',
    ''
].join('');

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

// concatenate & minify JS
gulp.task('minify-js', function () {
    return gulp.src('src/js/*js')
        .pipe(uglify())
        .pipe(header(banner, {pkg: pkg}))
        .pipe(rename({suffix: '.min'}))
        .pipe(gulp.dest('dist/js'))
        .pipe(browserSync.reload({
            stream: true
        }))
});

gulp.task('image-optimization', function (cb) {
    gulp.src(['src/img/**/*.png', 'src/img/**/*.jpg', 'src/img/**/*.gif', 'src/img/**/*.jpeg']).pipe(imageop({
        optimizationLevel: 5,
        progressive: true,
        interlaced: true
    })).pipe(gulp.dest('dist/img')).on('end', cb).on('error', cb);
});

// Run everything
gulp.task('default', ['minify-css', 'minify-js', 'image-optimization']);

// Configure the browserSync task
gulp.task('browserSync', function () {
    browserSync.init({
        server: {
            baseDir: ''
        },
    })
})

// Dev task with browserSync
gulp.task('dev', ['browserSync', 'minify-css', 'minify-js'], function () {
    gulp.watch('src/css/*.css', ['minify-css']);
    gulp.watch('src/js/*.js', ['minify-js']);
    // Reloads the browser whenever HTML or JS files change
    gulp.watch('pages/*.html', browserSync.reload);
    gulp.watch('dist/js/*.js', browserSync.reload);
});

// npm init
// npm install
// npm install browser-sync gulp --save-dev
// https://browsersync.io/docs/gulp