fixes hot reload for Shannon and hopefully others

Author: Shannon Anahata

src/mdx.ts

@@ -702,11 +702,14 @@ const fileBySlugCache = new Map<string, Promise<SlugFile>>();
  * This is useful for performance when rendering the same file multiple times.
  */
 export function getFileBySlugWithCache(slug: string): Promise<SlugFile> {
+  if (process.env.NODE_ENV === 'development') {
+    // Bypass the cache in development to ensure hot reload works for MDX files
+    return getFileBySlug(slug);
+  }
   let cached = fileBySlugCache.get(slug);
   if (!cached) {
     cached = getFileBySlug(slug);
     fileBySlugCache.set(slug, cached);
   }
-
   return cached;
 }