Today I Learned

A Hashrocket project

Phoenix will watch your JS for you, just watch!

With es6 javascript ecosystems most compilation/transpilation is done with watchers, programs that watch for changes in your code and then trigger compilation based on the changes you’ve made.

Phoenix has a method of integrating those watchers into the server itself.

config :myapp, MyApp.Endpoint,
  watchers: [yarn: ["run", "watch", cd: Path.expand("../assets", __DIR__)]]

The above configuration goes in config/dev.exs and runs the watch command whenever you start the server/endpoint. The keyword option cd is as of yet undocumented, but does what you think it does, changes the directory to the path you configure, which by convention in Phoenix 1.3 would be the assets directory. cd is the only keyword option.

The watchers start when you run your server. Just make a change to your javascript and refresh the page!

Looking for help? Elixir is quickly gaining momentum for web applications that need concurrency, performance, and the ability to connect to many different clients. The developers at Hashrocket are learning along with the rest of the development community that Elixir and Phoenix are viable Rails alternatives for the right application. Check out the source code for Today I Learned, written in Elixir, and contact us if you need help with your Elixir project.