From b4cc50a4233e63f6793d16cdfed6958e1b6b0520 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Lorber?= <slorber@users.noreply.github.com>
Date: Fri, 26 Sep 2025 16:36:27 +0200
Subject: [PATCH] fix(theme-mermaid): Fix Mermaid ELK layout dependency
 required bug on v3.9 (#11437)

---
 packages/docusaurus-theme-mermaid/src/index.ts | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/packages/docusaurus-theme-mermaid/src/index.ts b/packages/docusaurus-theme-mermaid/src/index.ts
index 622c6b2ef7..288000902b 100644
--- a/packages/docusaurus-theme-mermaid/src/index.ts
+++ b/packages/docusaurus-theme-mermaid/src/index.ts
@@ -49,6 +49,18 @@ export default async function themeMermaid(): Promise<Plugin<void>> {
             ),
           }),
         ],
+
+        // Workaround for weird Rspack/SWC issue
+        // See https://github.com/facebook/docusaurus/issues/11430
+        resolve: {
+          alias: {
+            ...(elkLayoutEnabled
+              ? {}
+              : {
+                  '@mermaid-js/layout-elk': false,
+                }),
+          },
+        },
       };
     },
   };