From cb9ae5a6f4873213cfaa0fc34c11576d6e592c7c Mon Sep 17 00:00:00 2001
From: Josh Goebel <me@joshgoebel.com>
Date: Wed, 11 Dec 2019 16:41:02 -0500
Subject: [PATCH 1/3] FIX: IE11 issue with Object.freeze()

---
 src/highlight.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/highlight.js b/src/highlight.js
index d8f0a069c6..db3651b8e4 100644
--- a/src/highlight.js
+++ b/src/highlight.js
@@ -1133,10 +1133,15 @@ https://highlightjs.org/
   function deepFreeze (o) {
     Object.freeze(o);
 
+    var objIsFunction = typeof o === 'function';
+
     Object.getOwnPropertyNames(o).forEach(function (prop) {
       if (o.hasOwnProperty(prop)
       && o[prop] !== null
       && (typeof o[prop] === "object" || typeof o[prop] === "function")
+      // IE11 fix: https://github.com/highlightjs/highlight.js/issues/2318
+      // TODO: remove in the future
+      && (objIsFunction ? prop !== 'caller' && prop !== 'callee' && prop !== 'arguments' : true)
       && !Object.isFrozen(o[prop])) {
         deepFreeze(o[prop]);
       }

From 81759bdec1906e615677e05423d30e91958d0f63 Mon Sep 17 00:00:00 2001
From: Josh Goebel <me@joshgoebel.com>
Date: Thu, 12 Dec 2019 07:56:02 -0500
Subject: [PATCH 2/3] strings are immutable, no need to freeze them

---
 src/highlight.js | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/src/highlight.js b/src/highlight.js
index db3651b8e4..d00469adda 100644
--- a/src/highlight.js
+++ b/src/highlight.js
@@ -1104,12 +1104,6 @@ https://highlightjs.org/
   };
 
   var constants = [
-    hljs.IDENT_RE,
-    hljs.UNDERSCORE_IDENT_RE,
-    hljs.NUMBER_RE,
-    hljs.C_NUMBER_RE,
-    hljs.BINARY_NUMBER_RE,
-    hljs.RE_STARTERS_RE,
     hljs.BACKSLASH_ESCAPE,
     hljs.APOS_STRING_MODE,
     hljs.QUOTE_STRING_MODE,

From 7965629b08cb9909a21ee8a31a10053a5cebe693 Mon Sep 17 00:00:00 2001
From: Josh Goebel <me@joshgoebel.com>
Date: Thu, 12 Dec 2019 09:02:28 -0500
Subject: [PATCH 3/3] changelog

---
 CHANGES.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/CHANGES.md b/CHANGES.md
index 17f5dccdf9..e044ae3d71 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -17,6 +17,13 @@ Language Improvements:
 - none yet.
 
 
+## Version 9.17.1
+
+Fixes:
+
+- fix(parser): resolve IE 11 issue with Object.freeze() (#2319) [Josh Goebel][]
+
+
 ## Version 9.17.0
 
 New languages: