Based on babel example
npm install -g gulp
gulp --version
//1-1.save gulp in package.json
npm install gulp --save-dev
//1-2.check in node_modules
ls node_modules
cat package.json
//1-3.edit gulpfile
vi gulpfile.js
gulp
mv gulpfile.js gulpfile.babel.js
npm install babel-core --save-dev
//1-4.check .babelrc
cat .babelrc
gulp
//2-1 add babel and browserify into gulp
npm install browserify babelify vinyl-source-stream --save -dev
//2-2 update gulp.babel.js & index.html
//2-3 mkdir src & mkdir dist
//2-4 rm app.js app.js.es6
//2-5 create new app.js & flash-message.js
gulp
ls dist/
cat dist/bundle.js
open index.html