I feel for you. You're being exposed to a framework that is a mess in one of the [most hated languages of 2016][0] [0]: https://stackoverflow.com/research/developer-survey-2016
Transpiling usually concerns syntax. Babel won't transpile .endsWith to a polyfill for you, hence the existence of that package
That's not a production build. Minify it, run dead code elimination. Exactly as you would with any other language with a compiler. Also, worth noting that the tutorial being broken isn't symptomatic of JS, that's a…
I feel for you. You're being exposed to a framework that is a mess in one of the [most hated languages of 2016][0] [0]: https://stackoverflow.com/research/developer-survey-2016
Transpiling usually concerns syntax. Babel won't transpile .endsWith to a polyfill for you, hence the existence of that package
That's not a production build. Minify it, run dead code elimination. Exactly as you would with any other language with a compiler. Also, worth noting that the tutorial being broken isn't symptomatic of JS, that's a…