fix(api): make every Vercel function return a response

api/avatar.js

@@ -34,7 +34,7 @@ export function isAllowedAvatarUrl(rawUrl) {
   return ALLOWED_AVATAR_HOSTS.has(url.hostname.toLowerCase());
 }
 
-export default async function handler(req) {
+export async function handler(req) {
   if (req.method === 'OPTIONS') {
     return new Response(null, { status: 204, headers: corsHeaders });
   }
@@ -76,3 +76,7 @@ export default async function handler(req) {
     return new Response('Avatar proxy error', { status: 502, headers: corsHeaders });
   }
 }
+
+// Vercel's Node.js runtime ignores a Response returned from a default-exported
+// function, so expose the Web `fetch` handler it recognizes instead.
+export default { fetch: handler };

api/deleteAccount.js

@@ -6,7 +6,7 @@ const corsHeaders = {
     'Access-Control-Allow-Headers': 'Content-Type, Authorization',
 };
 
-export default async function handler(req) {
+export async function handler(req) {
     if (req.method === 'OPTIONS') {
         return new Response(null, { status: 204, headers: corsHeaders });
     }
@@ -95,3 +95,7 @@ export default async function handler(req) {
         });
     }
 }
+
+// Vercel's Node.js runtime ignores a Response returned from a default-exported
+// function, so expose the Web `fetch` handler it recognizes instead.
+export default { fetch: handler };

api/download.js

@@ -97,7 +97,7 @@ const corsHeaders = {
   'Access-Control-Allow-Headers': 'Content-Type',
 };
 
-export default async function handler(req) {
+export async function handler(req) {
   if (req.method === 'OPTIONS') {
     return new Response(null, { status: 204, headers: corsHeaders });
   }
@@ -236,3 +236,7 @@ export default async function handler(req) {
     });
   }
 }
+
+// Vercel's Node.js runtime ignores a Response returned from a default-exported
+// function, so expose the Web `fetch` handler it recognizes instead.
+export default { fetch: handler };

api/downloadThumbnail.js

@@ -24,7 +24,7 @@ function isAllowedThumbnailUrl(rawUrl) {
   return ALLOWED_THUMBNAIL_HOSTS.has(u.hostname.toLowerCase());
 }
 
-export default async function handler(req) {
+export async function handler(req) {
   if (req.method === 'OPTIONS') {
     return new Response(null, { status: 204, headers: corsHeaders });
   }
@@ -89,4 +89,8 @@ export default async function handler(req) {
       headers: { ...corsHeaders, 'Content-Type': 'application/json' },
     });
   }
-} 
+}
+
+// Vercel's Node.js runtime ignores a Response returned from a default-exported
+// function, so expose the Web `fetch` handler it recognizes instead.
+export default { fetch: handler };

api/generateTitles.js

@@ -39,7 +39,7 @@ async function generateTitlesWithOpenRouter(description, creativity) {
   return data.choices[0].message.content;
 }
 
-export default async function handler(req) {
+export async function handler(req) {
   // Handle OPTIONS preflight request
   if (req.method === 'OPTIONS') {
     return new Response(null, {
@@ -132,4 +132,8 @@ export default async function handler(req) {
       headers: { ...corsHeaders, 'Content-Type': 'application/json' }
     });
   }
-}
+}
+
+// Vercel's Node.js runtime ignores a Response returned from a default-exported
+// function, so expose the Web `fetch` handler it recognizes instead.
+export default { fetch: handler };

api/info.js

@@ -176,7 +176,7 @@ function setCachedInfo(url, data) {
   }
 }
 
-export default async function handler(req) {
+export async function handler(req) {
   if (req.method === 'OPTIONS') {
     return new Response(null, { status: 204, headers: corsHeaders });
   }
@@ -353,3 +353,7 @@ This is a common issue affecting all YouTube downloaders and is not specific to
     });
   }
 }
+
+// Vercel's Node.js runtime ignores a Response returned from a default-exported
+// function, so expose the Web `fetch` handler it recognizes instead.
+export default { fetch: handler };

api/looney-check.js

@@ -244,7 +244,7 @@ export const config = {
 
 class ValidationError extends Error {}
 
-export default async function handler(request) {
+export async function handler(request) {
   if (request.method === 'OPTIONS') {
     return new Response(null, { status: 204, headers: corsHeaders(request) });
   }
@@ -318,3 +318,7 @@ export default async function handler(request) {
     return jsonResponse(request, { error: message }, status);
   }
 }
+
+// Vercel's Node.js runtime ignores a Response returned from a default-exported
+// function, so expose the Web `fetch` handler it recognizes instead.
+export default { fetch: handler };

api/uptime.js

@@ -154,4 +154,6 @@ export async function handler(request) {
   }
 }
 
-export default handler;
+// Vercel's Node.js runtime ignores a Response returned from a default-exported
+// function, so expose the Web `fetch` handler it recognizes instead.
+export default { fetch: handler };

server.js

@@ -2,13 +2,13 @@ import dotenv from 'dotenv';
 import express from 'express';
 import cors from 'cors';
 import { Readable } from 'stream';
-import infoHandler from './api/info.js';
-import downloadHandler from './api/download.js';
-import downloadThumbnailHandler from './api/downloadThumbnail.js';
-import generateTitlesHandler from './api/generateTitles.js';
-import deleteAccountHandler from './api/deleteAccount.js';
-import avatarHandler from './api/avatar.js';
-import looneyCheckHandler from './api/looney-check.js';
+import { handler as infoHandler } from './api/info.js';
+import { handler as downloadHandler } from './api/download.js';
+import { handler as downloadThumbnailHandler } from './api/downloadThumbnail.js';
+import { handler as generateTitlesHandler } from './api/generateTitles.js';
+import { handler as deleteAccountHandler } from './api/deleteAccount.js';
+import { handler as avatarHandler } from './api/avatar.js';
+import { handler as looneyCheckHandler } from './api/looney-check.js';
 import { handler as musicLinkHandler } from './api/music-link.js';
 import { handler as trackHandler } from './api/track.js';
 import { handler as statsHandler } from './api/stats.js';