From 7690a55d0d205ee877696306aaa5ddda8430bb03 Mon Sep 17 00:00:00 2001
From: Mohamed Yassin <m.hisham92@hotmail.com>
Date: Wed, 3 Dec 2025 11:53:19 +0200
Subject: [PATCH] fix: use emoji regex to correctly mask pair emojis

---
 package-lock.json | 21 +++++++++++----------
 package.json      |  1 +
 src/Lexer.ts      |  5 +++++
 3 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index f63d677360..57ddda7609 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24,6 +24,7 @@
         "commonmark": "0.31.2",
         "cross-env": "^10.1.0",
         "dts-bundle-generator": "^9.5.1",
+        "emoji-regex": "^10.6.0",
         "esbuild": "^0.27.0",
         "esbuild-plugin-umd-wrapper": "^3.0.0",
         "eslint": "^9.39.1",
@@ -3032,9 +3033,9 @@
       }
     },
     "node_modules/emoji-regex": {
-      "version": "8.0.0",
-      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
-      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "version": "10.6.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-10.6.0.tgz",
+      "integrity": "sha512-toUI84YS5YmxW219erniWD0CIVOo46xGKColeNQRgOzDorgBi1v4D71/OFzgD9GO2UGKIv1C3Sp8DAn0+j5w7A==",
       "dev": true,
       "license": "MIT"
     },
@@ -8613,13 +8614,6 @@
         "node": ">=20"
       }
     },
-    "node_modules/semantic-release/node_modules/emoji-regex": {
-      "version": "10.6.0",
-      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-10.6.0.tgz",
-      "integrity": "sha512-toUI84YS5YmxW219erniWD0CIVOo46xGKColeNQRgOzDorgBi1v4D71/OFzgD9GO2UGKIv1C3Sp8DAn0+j5w7A==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/semantic-release/node_modules/escape-string-regexp": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-5.0.0.tgz",
@@ -9265,6 +9259,13 @@
         "node": ">=8"
       }
     },
+    "node_modules/string-width/node_modules/emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/strip-ansi": {
       "version": "6.0.1",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
diff --git a/package.json b/package.json
index b8a05d192b..a30375a4c2 100644
--- a/package.json
+++ b/package.json
@@ -60,6 +60,7 @@
     "commonmark": "0.31.2",
     "cross-env": "^10.1.0",
     "dts-bundle-generator": "^9.5.1",
+    "emoji-regex": "^10.6.0",
     "esbuild": "^0.27.0",
     "esbuild-plugin-umd-wrapper": "^3.0.0",
     "eslint": "^9.39.1",
diff --git a/src/Lexer.ts b/src/Lexer.ts
index 89d439dc8c..eb3a351073 100644
--- a/src/Lexer.ts
+++ b/src/Lexer.ts
@@ -1,9 +1,12 @@
+import emojiRegex from 'emoji-regex';
 import { _Tokenizer } from './Tokenizer.ts';
 import { _defaults } from './defaults.ts';
 import { other, block, inline } from './rules.ts';
 import type { Token, TokensList, Tokens } from './Tokens.ts';
 import type { MarkedOptions } from './MarkedOptions.ts';
 
+const emojiMatcher = emojiRegex();
+
 /**
  * Block Lexer
  */
@@ -330,6 +333,8 @@ export class _Lexer<ParserOutput = string, RendererOutput = string> {
     // Mask out blocks from extensions
     maskedSrc = this.options.hooks?.emStrongMask?.call({ lexer: this }, maskedSrc) ?? maskedSrc;
 
+    maskedSrc = maskedSrc.replace(emojiMatcher, (m) => 'a'.repeat(m.length));
+
     let keepPrevChar = false;
     let prevChar = '';
     while (src) {