Temporary fix: Don't use ember imports in pretty text

app/assets/javascripts/discourse-loader.js

@@ -31,6 +31,12 @@ var define, requirejs;
         inject: Ember.inject.service
       }
     };
+  } else if (typeof __PRETTY_TEXT !== "undefined") {
+    // This is a hack because our server side code includes the pretty_text bundle
+    // which relies on ember now that we're using modules properly.
+    // The proper fix would be to move the upload urls code out of the pretty text
+    // bundle and remove this code. It should never be called;
+    EMBER_MODULES["@ember/runloop"] = {};
   }
 
   var _isArray;

lib/pretty_text.rb

@@ -73,6 +73,7 @@ module PrettyText
       ctx.attach("console.log", proc { |l| p l })
       ctx.eval('window.console = console;')
     end
+    ctx.eval("__PRETTY_TEXT = true")
 
     ctx_load(ctx, "#{Rails.root}/app/assets/javascripts/discourse-loader.js")
     ctx_load(ctx, "vendor/assets/javascripts/lodash.js")