Handle non-string image content types

src/utils/image.ts

@@ -16,14 +16,20 @@ export async function downloadImage(url: string, userAgent: string): Promise<Dow
     maxRedirects: 5,
   });
 
-  const contentType = response.headers['content-type'] || 'image/jpeg';
+  const contentType = normalizeContentType(response.headers['content-type']);
 
   return {
     buffer: Buffer.from(response.data),
-    mimeType: contentType.split(';')[0].trim(),
+    mimeType: contentType,
   };
 }
 
+/** Axios permits non-string header values, but media processing needs a MIME string. */
+export function normalizeContentType(contentType: unknown): string {
+  if (typeof contentType !== 'string') return 'image/jpeg';
+  return contentType.split(';', 1)[0].trim() || 'image/jpeg';
+}
+
 export function bufferToBase64(buffer: Buffer): string {
   return buffer.toString('base64');
 }