Hono & turborepo - typescript errors in vercel build - Help

Summary

Vercel build issue after tsup completes successfully.

Cannot reproduce with typescript/webpack/tsup/other bundlers - only vercel build.

Expected vs Current

Expected: vercel builds project without any type errors

Current: vercel builds with error:

Error: src/index.ts:77:37 - error TS2339: Property 'body' does not exist on type 'Response'.

77       return c.newResponse(response.body, response);

In addition to response.body, there are also issues with request.headers and a few others from drizzle-orm. Summary of how to bypass the TS errors:

diff --git a/apps/server/src/index.ts b/apps/server/src/index.ts
index 725fd4c..afd9d37 100644
--- a/apps/server/src/index.ts
+++ b/apps/server/src/index.ts
@@ -74,7 +74,7 @@ app.use(
   async (c, next) => {
     const { matched, response } = await api.handler(c.req.raw);
     if (matched) {
-      return c.newResponse(response.body, response);
+      return c.newResponse((response as any).body, response);
     }
 
     await next();
diff --git a/packages/api/src/server/index.ts b/packages/api/src/server/index.ts
index 51c42b7..c65bf3d 100644
--- a/packages/api/src/server/index.ts
+++ b/packages/api/src/server/index.ts
@@ -68,7 +68,7 @@ export const createApi = ({
         context: await createORPCContext({
           db,
           auth,
-          headers: request.headers,
+          headers: (request as any).headers,
         }),
       });
     },
diff --git a/packages/db/src/schemas/posts.ts b/packages/db/src/schemas/posts.ts
index 139baa6..cb9e3f4 100644
--- a/packages/db/src/schemas/posts.ts
+++ b/packages/db/src/schemas/posts.ts
@@ -5,8 +5,8 @@ import { user } from './auth';
 
 export const post = pgTable('post', (t) => ({
   id: t.uuid().primaryKey().defaultRandom(),
-  title: t.varchar({ length: 256 }).notNull(),
-  content: t.text().notNull(),
+  title: t.varchar({ length: 256 }).notNull() as any,
+  content: t.text().notNull() as any,
   createdAt: t
     .timestamp({ mode: 'string', withTimezone: true })
     .notNull()
@@ -22,5 +22,5 @@ export const CreatePostSchema = v.omit(
     title: v.pipe(v.string(), v.minLength(3), v.maxLength(256)),
     content: v.pipe(v.string(), v.minLength(5), v.maxLength(512)),
   }),
-  ['id', 'createdAt', 'createdBy'],
+  ['id', 'createdAt', 'createdBy'] as any,
 );

Reproduction

Fork the rt-stack project from GitHub and connect it to Vercel

GitHub

GitHub - nktnet1/rt-stack: Lightweight fullstack turborepo with modular components, shared configs, containerised deployments and 100% type-safety.

Lightweight fullstack turborepo with modular components, shared configs, containerised deployments and 100% type-safety. - nktnet1/rt-stack

Try to deploy "apps/server" (the hono backend server)
Observe the output:

The same issue occurs with vercel build locally.

Other details

  Info
  Description




  Source Code
  [https://github.com/nktnet1/rt-stack](https://github.com/nktnet1/rt-stack)


  Framework
  Turborepo, Hono, oRPC


  Project Settings
  
 `

"settings": { "createdAt": 1757251260212, "framework": "hono", "devCommand": null, "installCommand": null, "buildCommand": null, "outputDirectory": null, "rootDirectory": "apps/server", "directoryListing": false, "nodeVersion": "22.x" } Everything was left as default, but I've also tried overriding the build command, etc. Issue is, my build command runs to completion, butvercel build` seems to run something on top afterwards.

Issue reported by another user (NOTE: no new information, just for reference):

https://github.com/nktnet1/rt-stack/discussions/21