From 521e26a91dbb3e6f3b856b5b3ee3abf27679997a Mon Sep 17 00:00:00 2001
From: Josep Sayol <josep.sayol@gmail.com>
Date: Fri, 16 Jun 2017 13:48:13 +0200
Subject: [PATCH] WIP: fix error when checking EventRegistration callbacks

---
 src/database/core/view/EventRegistration.ts |  6 ++----
 src/utils/obj.ts                            | 21 ++++++++++++++++++++-
 2 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/src/database/core/view/EventRegistration.ts b/src/database/core/view/EventRegistration.ts
index 896cc3f93a4..5b6c70771e4 100644
--- a/src/database/core/view/EventRegistration.ts
+++ b/src/database/core/view/EventRegistration.ts
@@ -1,6 +1,6 @@
 import { DataSnapshot } from '../../api/DataSnapshot';
 import { DataEvent, CancelEvent, Event } from './Event';
-import { contains, getCount, getAnyKey } from '../../../utils/obj';
+import { contains, getCount, getAnyKey, every } from '../../../utils/obj';
 import { assert } from '../../../utils/assert';
 import { Path } from '../util/Path';
 import { Change } from './Change';
@@ -241,9 +241,7 @@ export class ChildEventRegistration implements EventRegistration {
             );
           } else {
             // Exact match on each key.
-            return this.callbacks_.every(<any>function (cb, eventType) {
-              return other.callbacks_[eventType] === cb;
-            });
+            return every(this.callbacks_, (eventType, cb) => other.callbacks_[eventType] === cb);
           }
         }
       }
diff --git a/src/utils/obj.ts b/src/utils/obj.ts
index 78a48add08d..3019cf945f5 100644
--- a/src/utils/obj.ts
+++ b/src/utils/obj.ts
@@ -110,4 +110,23 @@ export const getValues = function(obj) {
     res[i++] = obj[key];
   }
   return res;
-};
\ No newline at end of file
+};
+
+/**
+ * Tests whether every key/value pair in an object pass the test implemented
+ * by the provided function
+ *
+ * @param {?Object.<K,V>} obj Object to test.
+ * @param {!function(K, V)} fn Function to call for each key and value.
+ * @template K,V
+ */
+export const every = function<V>(obj: Object, fn: (k: string, v?: V) => boolean): boolean {
+  for (let key in obj) {
+    if (Object.prototype.hasOwnProperty.call(obj, key)) {
+      if (!fn(key, obj[key])) {
+        return false;
+      }
+    }
+  }
+  return true;
+};