Convert to Typescript (#34)

extensions/pusher/js/shims.d.ts

@@ -0,0 +1,15 @@
+import * as PusherTypes from 'pusher-js';
+
+declare module 'flarum/forum/ForumApplication' {
+  export default interface ForumApplication {
+    pusher: Promise<{
+      channels: {
+        main: PusherTypes.Channel;
+        user: PusherTypes.Channel | null;
+      };
+      pusher: PusherTypes.default;
+    }>;
+
+    pushedUpdates: Array<any>;
+  }
+}