Front end dev gulpfile - browserSync, sass, uglify, plumber

gulpfile.js

var gulp = require('gulp');
var browserSync = require('browser-sync').create();
var sass = require('gulp-sass');
var concat = require('gulp-concat');
var uglify = require('gulp-uglify');
var uglifyCss = require('gulp-uglifycss');
var plumber = require('gulp-plumber');

gulp.task('browserSync', function(){
  browserSync.init({
      proxy: "http://localhost/app/"
  });
});


gulp.task('watch', ['browserSync', 'sass'], function(){
  gulp.watch('app/assets/**/*.scss', ['sass'])
  gulp.watch('app/*.php', browserSync.reload);
  gulp.watch('app/assets/css/*.css', browserSync.reload);
  gulp.watch('app/assets/js/*.js', browserSync.reload);

})

gulp.task('sass', function(){
  return gulp.src('app/assets/css/style.scss')
    .pipe(plumber())
        .pipe(sass({includePaths: ['./app/assets/css/**']}, {errLogToConsole: true}))
        .on('error', reportError)
        .pipe(gulp.dest('app/css'))
        .pipe(browserSync.reload({stream: true}));
});


gulp.task('concat-min-js', function(){
  return gulp.src('app/assets/js/*.js')
    .pipe(concat('app/assets/js/theme.js'))
    .pipe(uglify())
    .pipe(gulp.dest('dist'));
});

gulp.task('concat-min-css', function(){
  return gulp.src('app/assets/css/style.css')
    .pipe(concat('style.min.css'))
    .pipe(uglifyCss())
    .pipe(gulp.dest('app/assets/css/style.min.css'));
});

gulp.task('concat-min', ['concat-min-css', 'concat-min-js']);


/// error handeling
var reportError = function (error) {
    // [log]
    //console.log(error);

    // Format and ouput the whole error object
    //console.log(error.toString());


    // ----------------------------------------------
    // Pretty error reporting

    var report = '\n';
    var chalk = gutil.colors.white.bgRed;

    if (error.plugin) {
        report += chalk('PLUGIN:') + ' [' + error.plugin + ']\n';
    }

    if (error.message) {
        report += chalk('ERROR:\040') + ' ' + error.message + '\n';
    }

    console.error(report);


    // ----------------------------------------------
    // Notification

    if (error.line && error.column) {
        var notifyMessage = 'LINE ' + error.line + ':' + error.column + ' -- ';
    } else {
        var notifyMessage = '';
    }

    notify({
        title: 'FAIL: ' + error.plugin,
        message: notifyMessage + 'See console.',
        sound: 'Sosumi' // See: https://github.com/mikaelbr/node-notifier#all-notification-options-with-their-defaults
    }).write(error);

    gutil.beep(); // System beep (backup)


    // ----------------------------------------------
    // Prevent the 'watch' task from stopping

    this.emit('end');
}