From 8355c4305b4432f08ebfe075ead76bf7ea81c8d5 Mon Sep 17 00:00:00 2001
From: Denis Pushkarev <zloirock@zloirock.ru>
Date: Fri, 16 Apr 2021 23:15:18 +0700
Subject: [PATCH] protect polyfilled built-in constructors from calling on
 instances

---
 CHANGELOG.md                                 | 2 +-
 packages/core-js/internals/internal-state.js | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5a67d6faea09..fc05c7f67897 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 ## Changelog
 ##### Unreleased
-- Nothing
+- Polyfilled built-in constructors protected from calling on instances
 
 ##### 3.10.1 - 2021.04.08
 - Prevented possible `RegExp#split` problems in old engines, [#751](https://github.com/zloirock/core-js/issues/751), [#919](https://github.com/zloirock/core-js/issues/919)
diff --git a/packages/core-js/internals/internal-state.js b/packages/core-js/internals/internal-state.js
index 86c1e4933350..82b742c77730 100644
--- a/packages/core-js/internals/internal-state.js
+++ b/packages/core-js/internals/internal-state.js
@@ -7,6 +7,7 @@ var shared = require('../internals/shared-store');
 var sharedKey = require('../internals/shared-key');
 var hiddenKeys = require('../internals/hidden-keys');
 
+var OBJECT_ALREADY_INITIALIZED = 'Object already initialized';
 var WeakMap = global.WeakMap;
 var set, get, has;
 
@@ -29,6 +30,7 @@ if (NATIVE_WEAK_MAP) {
   var wmhas = store.has;
   var wmset = store.set;
   set = function (it, metadata) {
+    if (wmhas.call(store, it)) throw new TypeError(OBJECT_ALREADY_INITIALIZED);
     metadata.facade = it;
     wmset.call(store, it, metadata);
     return metadata;
@@ -43,6 +45,7 @@ if (NATIVE_WEAK_MAP) {
   var STATE = sharedKey('state');
   hiddenKeys[STATE] = true;
   set = function (it, metadata) {
+    if (objectHas(it, STATE)) throw new TypeError(OBJECT_ALREADY_INITIALIZED);
     metadata.facade = it;
     createNonEnumerableProperty(it, STATE, metadata);
     return metadata;