use es6 transpiler and modules in gulp. also integrates fb-flo and caches builds

gulpfile.js

var fs          = require('fs');
var path        = require('path');
var gulp        = require('gulp');
var sourcemaps  = require('gulp-sourcemaps');
var esnext      = require('gulp-esnext');
var es6Modules  = require('gulp-es6-module-transpiler');
var concat      = require('gulp-concat');
var insert      = require('gulp-insert');
var uglify      = require('gulp-uglify');
var cache       = require('gulp-cached');
var remember    = require('gulp-remember');
var jshint      = require('gulp-jshint');
var flo         = require('fb-flo');


const scripts   = 'src/**/*.js';
const amdLoader = fs.readFileSync('lib/amdLoader.js');



gulp.task('default', function() {
    gulp.watch('src/', ['build']);
});


gulp.task('build', ['lint'], function() {
    return gulp.src(scripts)
        .pipe(es6Modules({
            type: 'amd'
        }))
        .pipe(esnext())
        .pipe(concat('createYourOwn.min.js'))
        .pipe(insert.prepend(amdLoader))
        .pipe(uglify())
        .pipe(gulp.dest('.'));
});


gulp.task('watch', ['flo'], function() {
    var watcher = gulp.watch(scripts, ['dev']);

    watcher.on('change', function(event) {
        if (event.type === 'deleted') { // if a file is deleted, forget about it
            delete cache.caches.scripts[event.path];
            remember.forget('scripts', event.path);
        }
    });
});


gulp.task('dev', function() {
    return gulp.src(scripts)
        .pipe(sourcemaps.init())
        .pipe(cache('es6'))

        .pipe(es6Modules({
            type: 'amd'
        }))
        .pipe(esnext())
        .pipe(remember('es6'))
        .pipe(concat('createYourOwn.min.js'))
        .pipe(insert.wrap(amdLoader, ';require("createYourOwn",function(){});'))
        .pipe(sourcemaps.write())
        .pipe(gulp.dest('.'));
});


gulp.task('lint', function() {
    return gulp.src(scripts)
        .pipe(jshint())
        .pipe(jshint.reporter('jshint-stylish'))
        .pipe(jshint.reporter('fail'));
});



gulp.task('flo', function(done) {

    var server = flo('src', {}, function resolver(filepath, callback) {

        var file = 'src/'+filepath;

        callback({
            resourceURL: 'http://localhost/kumpelding/wp-content/themes/kumpelding/js/createYourOwn/createYourOwn.min.js',
            contents: fs.readFileSync(file, 'utf8'),
            update: function(_window, _resourceURL) {
                console.log(_window.reload)
                // _window.reload();
                // get's executed on the client
                // freeze state of app and re-initialize
            }
        });

    });

    server.once('ready', done);

});