Always enable ember-cli-mirage, even in production

Author: Amiel Martin

config/environment.js

@@ -2,5 +2,9 @@
 'use strict';
 
 module.exports = function(/* environment, appConfig */) {
-  return { };
+  return {
+    'ember-cli-mirage': {
+      enabled: true, // always enable mirage, even in production
+    },
+  };
 };