lib/stimulus_reflex.rb in stimulus_reflex-3.3.0.pre4 vs lib/stimulus_reflex.rb in stimulus_reflex-3.3.0.pre5

@@ -18,7 +18,70 @@
 require "stimulus_reflex/broadcasters/selector_broadcaster"
 require "generators/stimulus_reflex_generator"
 
 module StimulusReflex
   class Engine < Rails::Engine
+    NODE_VERSION_FORMAT = /(\d\.\d\.\d.*):/
+    JSON_VERSION_FORMAT = /(\d\.\d\.\d.*)\"/
+
+    initializer "stimulus_reflex.verify_caching_enabled" do
+      unless caching_enabled?
+        puts <<~WARN
+          Stimulus Reflex requires caching to be enabled. Caching allows the session to be modified during ActionCable requests.
+          To enable caching in development, run:
+
+            rails dev:cache
+        WARN
+        exit
+      end
+    end
+
+    initializer "stimulus_reflex.verify_npm_package_version" do
+      unless node_version_matches?
+        puts <<~WARN
+          The Stimulus Reflex javascript package version (#{node_package_version}) does not match the Rubygem version (#{gem_version}).
+          To update the Stimulus Reflex node module:
+
+            yarn upgrade stimulus_reflex@#{gem_version}
+        WARN
+        exit
+      end
+    end
+
+    private
+
+    def caching_enabled?
+      Rails.application.config.action_controller.perform_caching &&
+        Rails.application.config.cache_store != :null_store
+    end
+
+    def node_version_matches?
+      node_package_version == gem_version
+    end
+
+    def gem_version
+      StimulusReflex::VERSION.gsub(".pre", "-pre")
+    end
+
+    def node_package_version
+      match = File.foreach(yarn_lock_path).grep(/^stimulus_reflex/)
+      return match.first[NODE_VERSION_FORMAT, 1] if match.present?
+
+      match = File.foreach(yarn_link_path).grep(/version/)
+      return match.first[JSON_VERSION_FORMAT, 1] if match.present?
+
+      puts <<~WARN
+        Can't locate the stimulus_reflex NPM package. 
+        Either add it to your package.json as a dependency or use "yarn link stimulus_reflex" if you are doing development.
+      WARN
+      exit
+    end
+
+    def yarn_lock_path
+      Rails.root.join("yarn.lock")
+    end
+
+    def yarn_link_path
+      Rails.root.join("node_modules", "stimulus_reflex", "package.json")
+    end
   end
 end