Hot reload for plugin development?

I was excited to upgrade my local discourse instance, and am now running 2.8 locally. But I am not yet able to get hot reload to work for html and js changes.

Here is how I run things:

cd into the discourse folder locally

$ redis-server //starts the server

$ rails s //starts the rails app

$ yarn //only run this the first time, I expect

$ bin/ember-cli //starts ember cli. The command ember serve--proxy "http://localhost:3000" gave me errors for some reason

This successfully has the app run at localhost:4200.

I have added in a plugin the local discourse instance, which is successfully displayed at localhost:4200. However, if I make changes to the html or js files, these changes are only displayed on the app running locally if I refresh the browser.

Do I have to do something else to have hot-reloading work?