fix(theme): only set classname on ul elements if they have an existin…

…g class (#9099) Co-authored-by: Sébastien Lorber <[email protected]> Co-authored-by: sebastienlorber <[email protected]>
facebook · Sep 20, 2023 · 471330d · 471330d
1 parent e531891
commit 471330d
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/packages/docusaurus-theme-classic/src/theme/MDXComponents/Ul/index.tsx b/packages/docusaurus-theme-classic/src/theme/MDXComponents/Ul/index.tsx
@@ -11,7 +11,11 @@ import type {Props} from '@theme/MDXComponents/Ul';
 
 import styles from './styles.module.css';
 
-function transformUlClassName(className?: string): string {
+function transformUlClassName(className?: string): string | undefined {
+  // Fix https://github.com/facebook/docusaurus/issues/9098
+  if (typeof className === 'undefined') {
+    return undefined;
+  }
   return clsx(
     className,
     // This class is set globally by GitHub/MDX. We keep the global class, and