diff --git a/.idea/osm_rewrite.iml b/.idea/osm_rewrite.iml
index 3c922e2a3..99fdf0593 100644
--- a/.idea/osm_rewrite.iml
+++ b/.idea/osm_rewrite.iml
@@ -98,4 +98,4 @@
     <orderEntry type="library" name="@types/mithril" level="application" />
     <orderEntry type="library" name="@types/jquery" level="application" />
   </component>
-</module>
+</module>
\ No newline at end of file
diff --git a/resources/js/utils.js b/resources/js/utils.js
index f7992dbcc..62d0440a7 100644
--- a/resources/js/utils.js
+++ b/resources/js/utils.js
@@ -1,7 +1,7 @@
 /**
  * Check if class/object A is the same as or a subclass of class B.
  */
-export default function subclassOf(A: object, B: object) {
+export default function subclassOf(A: Object, B: Object) {
   // noinspection JSUnresolvedVariable
   return A && (A === B || A.prototype instanceof B);
 }