From 205360c1093ad0059989e05d5efecc4f019225b7 Mon Sep 17 00:00:00 2001
From: Reda Al Sulais <u.yokozuna@gmail.com>
Date: Mon, 21 Aug 2023 03:09:05 +0300
Subject: [PATCH] fix: fix if statment logic checks if `parser` is not
 `undefined`

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

diff --git a/packages/mermaid/src/Diagram.ts b/packages/mermaid/src/Diagram.ts
index 1d4793bf0..941ada0f8 100644
--- a/packages/mermaid/src/Diagram.ts
+++ b/packages/mermaid/src/Diagram.ts
@@ -50,7 +50,7 @@ export class Diagram {
     this.parser.parse = (text: string) =>
       originalParse(cleanupComments(extractFrontMatter(text, this.db)));
 
-    if (this.parser.parser?.yy) {
+    if (this.parser.parser !== undefined) {
       this.parser.parser.yy = this.db;
     }
     this.init = diagram.init;