Hono template fails with `No valid entrypoint found` on dev only Windows

[ajh123]

Introduction

When attempting to run the Hono template with dev, browser requests fail with No valid entrypoint found, however when the project is deployed it works as expected. It is a Windows specfic error as when tested on Ubuntu 24.04 everything works

Steps to reproduce

1. Clone the official examples repo:
   git clone https://github.com/vercel/examples vercel-examples
2. Navigate to the Hono example:
   cd vercel-examples/framework-boilerplates/hono
3. Install dependencies:
   npm install
4. Run local development server:
   vc dev
5. Navigate to the URL in the browser

Windows logs:

$ D:\projects\web> git clone https://github.com/vercel/examples vercel-examples
Cloning into 'vercel-examples'...
remote: Enumerating objects: 37922, done.
remote: Counting objects: 100% (734/734), done.
remote: Compressing objects: 100% (370/370), done.
remote: Total 37922 (delta 586), reused 370 (delta 364), pack-reused 37188 (from 3)
Receiving objects: 100% (37922/37922), 100.97 MiB | 17.83 MiB/s, done.
Resolving deltas: 100% (16037/16037), done.
$ D:\projects\web> cd .\vercel-examples\
$ D:\projects\web\vercel-examples> cd .\framework-boilerplates\hono\
$ D:\projects\web\vercel-examples\framework-boilerplates\hono> npm i

added 4 packages, and audited 5 packages in 1s

found 0 vulnerabilities
$ D:\projects\web\vercel-examples\framework-boilerplates\hono> vc dev
Vercel CLI 44.7.3
? Set up and develop “D:\projects\web\vercel-examples\framework-boilerplates\hono”? yes
? Which scope should contain your project? ajh123's projects
? Link to existing project? no
? What’s your project’s name? hono-example
? In which directory is your code located? ./
Local settings detected in vercel.json:
Auto-detected Project Settings (🔥 Hono):
- Build Command: None
- Development Command: None
- Install Command: `yarn install`, `pnpm install`, `npm install`, or `bun install`
- Output Directory: N/A
? Want to modify these settings? no
? Want to use the default Deployment Protection settings? (Vercel Authentication: Standard Protection) yes
🔗  Linked to ajh123s-projects/hono-example (created .vercel)
> Ready! Available at http://localhost:3000
Error: No valid entrypoint found
Error: No valid entrypoint found

Environment

• OS1: Windows 11
• OS2: Ubuntu 24.04
• Vercel CLI version: 44.7.3
• Node.js version: v22.14.0

[xiaofeiTM233]

For Vercel CLI 46.0.3

Error: No valid entrypoint found. Valid entrypoints are:
- app.{js,cjs,mjs,ts,mts}
- index.{js,cjs,mjs,ts,mts}
- server.{js,cjs,mjs,ts,mts}
- src\index.{js,cjs,mjs,ts,mts}

and after I move ./src/index.ts to ./index.ts, it back to normal