diff --git a/wherehows-web/app/typings/global-plugin.d.ts b/wherehows-web/app/typings/global-plugin.d.ts
new file mode 100644
index 0000000000..35e0bad9d1
--- /dev/null
+++ b/wherehows-web/app/typings/global-plugin.d.ts
@@ -0,0 +1,6 @@
+import Ember from 'ember';
+
+// opt-in to allow types for Ember Array Prototype extensions
+declare global {
+  interface Array<T> extends Ember.ArrayPrototypeExtensions<T> {}
+}