Bug: Deployment failed in Vercel following MiniKit Tutorial

[viccmoor]

Describe the bug and the steps to reproduce it

1. Follow the steps from https://docs.base.org/builderkits/minikit/quickstart till "Deploying to Vercel" section.
2. Install Vercel CLI.
3. Try deploying the project with the command "vercel".
4. Vercel returns a build error:

x 'import', and 'export' cannot be used outside of module code
    ,-[48:1]
 48 | self.addEventListener('beforeunload', () => {
 49 |     stopHeartbeat();
 50 | });
 51 | export {};
    : ^^^^^^
 52 | //# sourceMappingURL=HeartbeatWorker.js.map
    `----
Caused by:
    0: failed to parse input file
    1: Syntax Error
> Build failed because of webpack errors
Error: Command "npm run build" exited with 1

What's the expected behavior?

The miniapp should deploy correctly on Vercel, but the presence of export {}; prevents it. The error originates from the module @coinbase/wallet-sdk/dist/sign/walletlink/relay/connection/HeartbeatWorker.js. I resolved the issue by simply removing the export {}; statement, which allowed the build to succeed locally—previously, it failed both locally and on Vercel.

What version of the libraries are you using?

• OnChainKit: 0.38.13