Gulp + Watchify + Debowerify + Uglify

gulpfile.js

/* global require */
var gulp        = require('gulp');
var browserify  = require('browserify');
var sync        = require('browser-sync');
var source      = require('vinyl-source-stream');
var uglify      = require('gulp-uglify');
var plumber     = require('gulp-plumber');
var streamify   = require('gulp-streamify');
var watchify    = require('watchify');

gulp.task('sync', ['scripts'], function() {
    sync.init(null, {
        server: {
            baseDir: "./www"
        }
    });
});

gulp.task('scripts', function () {
    var bundler = watchify('./src/scripts/main');
    bundler.transform('debowerify');
    bundler.on('update', rebundle);
    
    function rebundle () {
        return bundler.bundle()
        .pipe(source('bundle.js'))
        .pipe(streamify(uglify()))
        .pipe(gulp.dest('www/scripts'))
        .pipe(sync.reload({stream:true, once: true}));
    }
    
    return rebundle();
});

gulp.task('default', ['sync'], function () {
    gulp.watch("./src/scripts/**/*.js", ['scripts']);
});