From 11c0864ba43bc797eb915f87d04ed86feda4e12f Mon Sep 17 00:00:00 2001
From: Jon Rimmer <jon.rimmer@gmail.com>
Date: Fri, 5 Jul 2019 20:37:49 +0100
Subject: [PATCH] fix(store): add immutability check for IE compatibility
 (#1997)

IE errors when attempting to access the `caller` property of a function,
so rearrange the freeze function to check for this first.

Fixes #1991
---
 .../src/meta-reducers/immutability_reducer.ts      | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/modules/store/src/meta-reducers/immutability_reducer.ts b/modules/store/src/meta-reducers/immutability_reducer.ts
index c157103ed8..ecec65ce9d 100644
--- a/modules/store/src/meta-reducers/immutability_reducer.ts
+++ b/modules/store/src/meta-reducers/immutability_reducer.ts
@@ -20,16 +20,20 @@ function freeze(target: any) {
   const targetIsFunction = isFunction(target);
 
   Object.getOwnPropertyNames(target).forEach(prop => {
-    const propValue = target[prop];
     if (
       hasOwnProperty(target, prop) &&
       (targetIsFunction
         ? prop !== 'caller' && prop !== 'callee' && prop !== 'arguments'
-        : true) &&
-      (isObjectLike(propValue) || isFunction(propValue)) &&
-      !Object.isFrozen(propValue)
+        : true)
     ) {
-      freeze(propValue);
+      const propValue = target[prop];
+
+      if (
+        (isObjectLike(propValue) || isFunction(propValue)) &&
+        !Object.isFrozen(propValue)
+      ) {
+        freeze(propValue);
+      }
     }
   });