From ad8e297ca557e6bc6698ad42fccca964e8797660 Mon Sep 17 00:00:00 2001
From: olafbuitelaar <olaf.buitelaar@gmail.com>
Date: Wed, 21 May 2025 12:01:33 +0200
Subject: [PATCH 1/2] check if toString is writable

in cases the `Function.prototype` is sealed/frozen, this will throw an error causing any remaining code to abort.
---
 packages/core-js/internals/make-built-in.js | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/packages/core-js/internals/make-built-in.js b/packages/core-js/internals/make-built-in.js
index 574309851270..a1fbc42cff09 100644
--- a/packages/core-js/internals/make-built-in.js
+++ b/packages/core-js/internals/make-built-in.js
@@ -7,6 +7,7 @@ var DESCRIPTORS = require('../internals/descriptors');
 var CONFIGURABLE_FUNCTION_NAME = require('../internals/function-name').CONFIGURABLE;
 var inspectSource = require('../internals/inspect-source');
 var InternalStateModule = require('../internals/internal-state');
+var getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;
 
 var enforceInternalState = InternalStateModule.enforce;
 var getInternalState = InternalStateModule.get;
@@ -16,6 +17,7 @@ var defineProperty = Object.defineProperty;
 var stringSlice = uncurryThis(''.slice);
 var replace = uncurryThis(''.replace);
 var join = uncurryThis([].join);
+var functionToStringDescriptor = getOwnPropertyDescriptor(Function.prototype, 'toString');
 
 var CONFIGURABLE_LENGTH = DESCRIPTORS && !fails(function () {
   return defineProperty(function () { /* empty */ }, 'length', { value: 8 }).length !== 8;
@@ -49,7 +51,9 @@ var makeBuiltIn = module.exports = function (value, name, options) {
 };
 
 // add fake Function#toString for correct work wrapped methods / constructors with methods like LoDash isNative
-// eslint-disable-next-line no-extend-native -- required
-Function.prototype.toString = makeBuiltIn(function toString() {
-  return isCallable(this) && getInternalState(this).source || inspectSource(this);
-}, 'toString');
+if ((functionToStringDescriptor.writable || functionToStringDescriptor.set) && functionToStringDescriptor.configurable) {
+  // eslint-disable-next-line no-extend-native -- required 
+  Function.prototype.toString = makeBuiltIn(function toString() {
+    return isCallable(this) && getInternalState(this).source || inspectSource(this);
+  }, 'toString');
+}

From a6d454cedf52e640c44bf9001d53f58a049941f2 Mon Sep 17 00:00:00 2001
From: olafbuitelaar <olaf.buitelaar@gmail.com>
Date: Wed, 21 May 2025 14:18:23 +0200
Subject: [PATCH 2/2] use try...catch block instead, in case the assignment
 fails

---
 packages/core-js/internals/make-built-in.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/packages/core-js/internals/make-built-in.js b/packages/core-js/internals/make-built-in.js
index a1fbc42cff09..b784ef1c505c 100644
--- a/packages/core-js/internals/make-built-in.js
+++ b/packages/core-js/internals/make-built-in.js
@@ -7,7 +7,6 @@ var DESCRIPTORS = require('../internals/descriptors');
 var CONFIGURABLE_FUNCTION_NAME = require('../internals/function-name').CONFIGURABLE;
 var inspectSource = require('../internals/inspect-source');
 var InternalStateModule = require('../internals/internal-state');
-var getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;
 
 var enforceInternalState = InternalStateModule.enforce;
 var getInternalState = InternalStateModule.get;
@@ -17,7 +16,6 @@ var defineProperty = Object.defineProperty;
 var stringSlice = uncurryThis(''.slice);
 var replace = uncurryThis(''.replace);
 var join = uncurryThis([].join);
-var functionToStringDescriptor = getOwnPropertyDescriptor(Function.prototype, 'toString');
 
 var CONFIGURABLE_LENGTH = DESCRIPTORS && !fails(function () {
   return defineProperty(function () { /* empty */ }, 'length', { value: 8 }).length !== 8;
@@ -51,9 +49,11 @@ var makeBuiltIn = module.exports = function (value, name, options) {
 };
 
 // add fake Function#toString for correct work wrapped methods / constructors with methods like LoDash isNative
-if ((functionToStringDescriptor.writable || functionToStringDescriptor.set) && functionToStringDescriptor.configurable) {
+try {
   // eslint-disable-next-line no-extend-native -- required 
   Function.prototype.toString = makeBuiltIn(function toString() {
     return isCallable(this) && getInternalState(this).source || inspectSource(this);
   }, 'toString');
+} catch {
+  /* silently ignore assignment error */
 }