The inferred type of "X" cannot be named without a reference to "Y". This is likely not portable. A type annotation is necessary.

This error we have while trying installing dependencies with ts build (dependency is another repo with prepare script) by this action.

The inferred type of "X" cannot be named without a reference to "Y". This is likely not portable. A type annotation is necessary.

Locally or on self-hosted runner all be fine. I try add node-linker=hoisted or auto-install-peers = true and error still exists.

But on our runner pnpm has another store directory (pnpm installed by npm install -g pnpm@7)

// self-host runner
/home/{user}/.local/share/pnpm/store/v3`

// cloud runner with this action
/home/runner/setup-pnpm/node_modules/.bin/store/v3

And after changing store directory to same as self-host runner, the error is gone

- name: Install pnpm
   uses: pnpm/action-setup@v2
   with:
    version: 7

- name: Create store dir
   run: mkdir -p ~/.local/share/pnpm/store/v3

- name: Reassign store dir
   run: pnpm config set store-dir ~/.local/share/pnpm/store/v3

I don't know where this error, mb because path of runner contain node_modules or something else. Hope this helps someone else

Start by inspecting the action's pnpm installation and store-directory configuration, then reproduce the dependency prepare/build on a GitHub-hosted runner versus a self-hosted runner. Done means identifying why the different store path triggers the TypeScript portability error and documenting or implementing a reliable configuration that avoids it.