Remove sprockets config step, ensure propshaft compatibility (#9)

README.md

@@ -17,11 +17,6 @@ $ rails inner_performance:install:migrations
 $ rails db:migrate
 ```
 
-Add inner_performance to `app/assets/config/manifest.js`
-```javascript
-//= link inner_performance/application.css
-```
-
 Mount UI in `routes.rb` (don't forget to protect it!)
 
 ```ruby

app/assets/stylesheets/inner_performance/application.css

@@ -1,15 +0,0 @@
-/*
- * This is a manifest file that'll be compiled into application.css, which will include all the files
- * listed below.
- *
- * Any CSS and SCSS file within this directory, lib/assets/stylesheets, vendor/assets/stylesheets,
- * or any plugin's vendor/assets/stylesheets directory can be referenced here using a relative path.
- *
- * You're free to add application-wide styles to this file and they'll appear at the bottom of the
- * compiled file so the styles you add here take precedence over styles defined in any other CSS/SCSS
- * files in this directory. Styles in this file should be added after the last require_* statement.
- * It is generally better to create a new file per style scope.
- *
- *= require_tree .
- *= require_self
- */

lib/inner_performance/engine.rb

@@ -11,5 +11,10 @@ class Engine < ::Rails::Engine
     initializer 'inner_performance.install' do
       InnerPerformance.install!
     end
+
+    initializer 'inner_performance.assets.precompile' do |app|
+      # this initializer is only called when sprockets is in use
+      app.config.assets.precompile << 'inner_performance_manifest.js'
+    end
   end
 end