From 7fe35b84a37164f38e58ff7b377013203852f29f Mon Sep 17 00:00:00 2001
From: "codefix-patchflow[bot]"
 <292349666+codefix-patchflow[bot]@users.noreply.github.com>
Date: Fri, 19 Jun 2026 04:09:10 +0000
Subject: [PATCH] fix: isolate lexer defaults per instance

---
 src/Lexer.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Lexer.ts b/src/Lexer.ts
index 84560a1b6c..3275aecdf7 100644
--- a/src/Lexer.ts
+++ b/src/Lexer.ts
@@ -24,7 +24,7 @@ export class _Lexer<ParserOutput = string, RendererOutput = string> {
     // TokenList cannot be created in one go
     this.tokens = [] as unknown as TokensList;
     this.tokens.links = Object.create(null);
-    this.options = options || _defaults;
+    this.options = { ..._defaults, ...options };
     this.options.tokenizer = this.options.tokenizer || new _Tokenizer<ParserOutput, RendererOutput>();
     this.tokenizer = this.options.tokenizer;
     this.tokenizer.options = this.options;