From f3eca1c5cf03973e8c0cce2d8d4545eac10574d8 Mon Sep 17 00:00:00 2001
From: bekzod <bekzod@me.com>
Date: Wed, 30 May 2018 13:36:18 +0500
Subject: [PATCH] observed properties are enumerable when set

---
 .../-internals/metal/lib/property_set.ts      | 10 +++++---
 .../runtime/tests/system/core_object_test.js  | 25 ++++++++++++++++++-
 2 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/packages/@ember/-internals/metal/lib/property_set.ts b/packages/@ember/-internals/metal/lib/property_set.ts
index a54d057ff12..2d965d6fd8e 100644
--- a/packages/@ember/-internals/metal/lib/property_set.ts
+++ b/packages/@ember/-internals/metal/lib/property_set.ts
@@ -1,5 +1,5 @@
 import { descriptorFor, isDescriptor, Meta, meta, peekMeta } from '@ember/-internals/meta';
-import { HAS_NATIVE_PROXY, toString } from '@ember/-internals/utils';
+import { HAS_NATIVE_PROXY, toString, lookupDescriptor } from '@ember/-internals/utils';
 import { assert, deprecate } from '@ember/debug';
 import { PROPERTY_BASED_DESCRIPTORS } from '@ember/deprecated-features';
 import EmberError from '@ember/error';
@@ -152,9 +152,13 @@ if (DEBUG) {
   };
 
   makeEnumerable = (obj: object, key: string) => {
-    let desc = Object.getOwnPropertyDescriptor(obj, key);
+    let desc = lookupDescriptor(obj, key);
 
-    if (desc && desc.set && (desc.set as MandatorySetterFunction).isMandatorySetter) {
+    if (
+      desc !== null &&
+      desc.set !== undefined &&
+      (desc.set as MandatorySetterFunction).isMandatorySetter
+    ) {
       desc.enumerable = true;
       Object.defineProperty(obj, key, desc);
     }
diff --git a/packages/@ember/-internals/runtime/tests/system/core_object_test.js b/packages/@ember/-internals/runtime/tests/system/core_object_test.js
index af3380fa6e9..f48e625d430 100644
--- a/packages/@ember/-internals/runtime/tests/system/core_object_test.js
+++ b/packages/@ember/-internals/runtime/tests/system/core_object_test.js
@@ -1,5 +1,5 @@
 import { getOwner, setOwner } from '@ember/-internals/owner';
-import { get } from '@ember/-internals/metal';
+import { get, set, observer } from '@ember/-internals/metal';
 import CoreObject from '../../lib/system/core_object';
 import { moduleFor, AbstractTestCase, buildOwner } from 'internal-test-helpers';
 
@@ -110,5 +110,28 @@ moduleFor(
         },
       }).create(options);
     }
+
+    ['@test observed properties are enumerable when set GH#14594'](assert) {
+      let callCount = 0;
+      let Test = CoreObject.extend({
+        myProp: null,
+        anotherProp: undefined,
+        didChangeMyProp: observer('myProp', function() {
+          callCount++;
+        }),
+      });
+
+      let test = Test.create();
+      set(test, 'id', '3');
+      set(test, 'myProp', { id: 1 });
+
+      assert.deepEqual(Object.keys(test).sort(), ['id', 'myProp']);
+
+      set(test, 'anotherProp', 'nice');
+
+      assert.deepEqual(Object.keys(test).sort(), ['anotherProp', 'id', 'myProp']);
+
+      assert.equal(callCount, 1);
+    }
   }
 );