Allow to work even if SourceMapServer is missing

Newer Opal::Sprockets serves source maps inline and has removed the server.
opal · Sep 7, 2018 · 37769dc · 37769dc
1 parent 4342686
commit 37769dc
Showing 1 changed file with 8 additions and 6 deletions.
diff --git a/lib/opal/rails/engine.rb b/lib/opal/rails/engine.rb
@@ -34,14 +34,16 @@ class Engine < ::Rails::Engine
           Opal::Config.send(key, value) if Opal::Config.respond_to? key
         end
 
-        app.routes.prepend do
-          if Opal::Config.source_map_enabled && config.assets.compile && config.assets.debug
-            maps_prefix = '/__OPAL_SOURCE_MAPS__'
-            maps_app    = Opal::SourceMapServer.new(app.assets, maps_prefix)
+        if defined?(Opa::SourceMapServer)
+          app.routes.prepend do
+            if Opal::Config.source_map_enabled && config.assets.compile && config.assets.debug
+              maps_prefix = '/__OPAL_SOURCE_MAPS__'
+              maps_app    = Opal::SourceMapServer.new(app.assets, maps_prefix)
 
-            ::Opal::Sprockets::SourceMapHeaderPatch.inject!(maps_prefix)
+              ::Opal::Sprockets::SourceMapHeaderPatch.inject!(maps_prefix)
 
-            mount maps_app => maps_prefix
+              mount maps_app => maps_prefix
+            end
           end
         end
       end