Next.js: TypeScript Server - Cannot read property 'kind' of undefined`

[nirtamir2]

Bug report

Describe the bug

When running next with TypeScript custom server (as in the example app), there is an error
TypeError: Cannot read property 'kind' of undefined

To Reproduce

1. Run npx create-next-app my-app.
2. choose Example from the Next.js repo.
3. select custom-server-typescript and wait for completion.
4. run dev script yarn dev.

You will see the error in the log:

error - TypeError: Cannot read property 'kind' of undefined

with the stack trace.
Also, if you will navigate to your app in the browser (http://localhost:3000) you will see the same error
and after a while (short noticeable delay), you will see the correct app content.

Expected behavior

No error should be presented

Screenshots

Terminal:

Browser:

After a while, the browser error disappear

System information

• OS: Windows
• Browser (if applies) Chrome
• Version of Next.js: 9.5.1 (latest)
• Version of Node.js: 12.16.3

Additional context

It may be a TypeScript issue?

[sagar-gavhane]

This is TypeScript issue (#38383) and folks suggested to downgrade typescript v3.8.3 to temporary fix this issue until TypeScript releases new patch.

[nirtamir2]

Closed by #15833 (temporary solution to use TypeScript v3.8.3 until TypeScript will fix their issue).

[gajet5]

You can also install version ^4.0.2, the problem is also fixed.