From c4a37ff95de241ab254856469b8e539436bf5798 Mon Sep 17 00:00:00 2001
From: Sean O'Donohue <sean.odonohue@detroitlabs.com>
Date: Thu, 7 Feb 2019 21:15:48 -0500
Subject: [PATCH] Check for valid input event.

---
 src/BundleManager.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/BundleManager.js b/src/BundleManager.js
index b7b81a16..75da0e05 100644
--- a/src/BundleManager.js
+++ b/src/BundleManager.js
@@ -503,6 +503,10 @@ class BundleManager {
       const loader = require(eventPath);
       const eventImport = this._getLoader(loader, srcPath);
 
+      if (typeof eventImport.event !== 'function') {
+        throw new Error(`Bundle ${bundle} has an invalid input event '${eventName}'. Expected a function, got: `, eventImport.event);
+      }
+
       this.state.InputEventManager.add(eventName, eventImport.event(this.state));
     }