Do this less dirty

web/pages/index.tsx

@@ -70,7 +70,7 @@ export default function Index({ documents, searchIndex }: IndexProps) {
               key={document.filePath}
               as={`/documents/${document.filePath.replace(/\.mdx?$/, '')}`}
               href={`/documents/[slug]`}
-              title={document.data.title}
+              title={document.data.title ?? 'Untitled'}
               desc={document.data.description}
             />
           ))}

web/utils/mdx-utils.ts

@@ -16,9 +16,15 @@ export const documentFilePaths = fs
   // Only include md(x) files
   .filter((path) => /\.mdx?$/.test(path))
 
+export interface DocumentData {
+  title?: string
+  description?: string
+  indexWeight?: number
+}
+
 export interface Document {
   content: string
-  data: object
+  data: DocumentData
   filePath: string
 }