[pnpm] Error 2742 The inferred type of xxx cannot be named

[vjau]

With same code, just replacing tsc with tsgo gives me multiple TS 2742 errors
like these

error TS2742: The inferred type of 'router' cannot be named without a reference to '../../node_modules/@trpc/server/dist/unstable-core-do-not-import.js'. This is likely not portable. A type annotation is necessary.

Repro with instructions
https://github.com/vjau/tsgo-error

[vjau]

20250610 doesn't error anymore with npm.
But it still errors with a pnpm project. I updated the repro accordingly.

[bompi88]

Can confirm that it still happens with a pnpm project.

[dougludlow]

Seeing the same thing in a react project that also uses pnpm:

The inferred type of 'XXX' cannot be named without a reference to '.pnpm/@types+react@18.3.12/node_modules/@types/react/jsx-runtime'. This is likely not portable. A type annotation is necessary. ts(2742)

[RohinBhargava]

+1; note: as a temporary workaround, I could export types from the upstream package and this satisfied pnpm tsgo. A more native solution would be much better, though!

[vjau]

I removed Fastify, which was not needed for the reproduction.

[tmm1]

Hitting this too in a pnpm project.

The missing code is:

typescript-go/internal/modulespecifiers/specifiers.go

Lines 235 to 237 in c5ec812

	// !!! TODO: Symlink directory handling
	// const symlinkedDirectories = host.getSymlinkCache?.().getSymlinkedDirectoriesByRealpath();
	// const fullImportedFileName = getNormalizedAbsolutePath(importedFileName, cwd);

typescript-go/internal/compiler/knownsymlinks.go

Lines 38 to 44 in c5ec812

	// Large, interconnected dependency graphs in pnpm will have a huge number of symlinks
	// where both the realpath and the symlink path are inside node_modules/.pnpm. Since
	// this path is never a candidate for a module specifier, we can ignore it entirely.
	// !!!
	// if realDirectory != nil {
	// if _, ok := cache.directories.Load(symlinkPath); !ok {

typescript-go/internal/modulespecifiers/types.go

Line 49 in c5ec812

// GetSymlinkCache() any // !!! TODO: adapt new resolution cache model

[dBianchii]

I am getting this with pnpm:

[vjau]

I have hope the WIP PR #1348 will fix this.
I maybe completely wrong though 🤷

[safareli]

is there any short term workaround for this?

[RohinBhargava]

I've found you can directly import from the package, and the module resolution takes care of the errors for me. It is annoying to create this "shim", however.