From e86d7894f525bc4c3989dec8b8a84ec589078120 Mon Sep 17 00:00:00 2001
From: Knut Sveidqvist <knsv@sveido.com>
Date: Mon, 17 Oct 2022 10:51:41 +0200
Subject: [PATCH] #3680 Add font familiy in a way that does remove other
 configuration

---
 packages/mermaid/src/mermaidAPI.ts | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/packages/mermaid/src/mermaidAPI.ts b/packages/mermaid/src/mermaidAPI.ts
index 7c967e5fd..df6ab1a2b 100644
--- a/packages/mermaid/src/mermaidAPI.ts
+++ b/packages/mermaid/src/mermaidAPI.ts
@@ -455,10 +455,11 @@ const handleDirective = function (p: any, directive: any, type: string): void {
 /** @param {MermaidConfig} options */
 async function initialize(options: MermaidConfig) {
   // Handle legacy location of font-family configuration
-  if (options?.fontFamily) {
-    if (!options.themeVariables?.fontFamily) {
-      options.themeVariables = { fontFamily: options.fontFamily };
+  if (options.fontFamily) {
+    if (!options.themeVariables) {
+      options.themeVariables = {};
     }
+    options.themeVariables.fontFamily = options.fontFamily;
   }
 
   // Set default options