bug: The inferred type of 'appRouter' cannot be named without a reference to ...

[echocrow]

Provide environment information

Local machine:

envinfo: command not found

¯\_(ツ)_/¯

Stackblitz repro:

  System:
    OS: Linux 5.0 undefined
    CPU: (6) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 16.14.2 - /usr/local/bin/node
    Yarn: 1.22.10 - /usr/local/bin/yarn
    npm: 7.17.0 - /usr/local/bin/npm
  npmPackages:
    @trpc/server: 10.0.0-proxy-beta.18 => 10.0.0-proxy-beta.18 
    typescript: ^4.8 => 4.8.4 

Describe the bug

Under "moduleResolution": "Node16" (or "NodeNext"), compilation of TypeScript types for the router can fail with error

TS2742: The inferred type of 'appRouter' cannot be named without a reference to '../node_modules/@trpc/server/dist/core/internals/config.js'. This is likely not portable. A type annotation is necessary.

Link to reproduction

https://stackblitz.com/edit/trpc-server-inferred-type-cannot-be-named?file=src%2Findex.ts&view=editor

To reproduce

See repro:

1. Set up package with Typescript
2. Set "moduleResolution": "Node16"
3. Try to compile types, e.g. via tsc --declaration

Additional information

Related issues:

• bug: The inferred type of 'appRouter' cannot be named without a reference to '../../node_modules/@trpc/server/dist/error/formatter.js'. This is likely not portable. A type annotation is necessary. #2717

Tried several suggested solutions (e.g. mentioned here); none worked, or had undesired side-effects.

The same issue exists in 9.x (after having manually worked around the module resolution).

👨‍👧‍👦 Contributing

• 🙋‍♂️ Yes, I'd be down to file a PR fixing this bug!