notes

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https://philipwalton.com/articles/deploying-es2015-code-in-production-today/

Enable ES6
  Safari 10.1 - already enabled
  Chrome Canary 60 – behind the Experimental Web Platform flag in chrome:flags. (also Experimental JavaScript)
  Firefox 54 – behind the dom.moduleScripts.enabled setting in about:config.
  Edge 15 – behind the Experimental JavaScript Features setting in about:flags.
  Opera - about:flags - Experimental JavaScript - enable (doesn't seem to work)

https://github.com/mbeaudru/modern-js-cheatsheet
http://babeljs.io/learn-es2015/
http://exploringjs.com/es6/ch_modules.html
https://webapplog.com/es6/
https://ponyfoo.com/articles/es6#promises


 - Sinatra::Handler

- config options pass some part to server start