API used by Plug to invoke the code reloader on every request.

API used by Plug to start the code reloader.

@spec reload(module()) :: :ok | {:error, binary()}

Reloads code for the current Mix project by invoking the :reloadable_compilers on the list of :reloadable_apps.

This is configured in your application environment like:

config :your_app, YourAppWeb.Endpoint,
  reloadable_compilers: [:gettext, :elixir],
  reloadable_apps: [:ui, :backend]

Keep in mind :reloadable_compilers must be a subset of the :compilers specified in project/0 in your mix.exs.

The :reloadable_apps defaults to nil. In such case default behaviour is to reload the current project if it consists of a single app, or all applications within an umbrella project. You can set :reloadable_apps to a subset of default applications to reload only some of them, an empty list - to effectively disable the code reloader, or include external applications from library dependencies.

This function is a no-op and returns :ok if Mix is not available.

@spec reload!(module()) :: :ok | {:error, binary()}

Same as reload/1 but it will raise if Mix is not available.

@spec sync() :: :ok

Synchronizes with the code server if it is alive.

It returns :ok. If it is not running, it also returns :ok.