Type errors with exported types or variables in .ts files

Describe the bug

Hi,

In a project I want to build a library with its types, therefore I use the vue-tsc --project command to build types separately.

In this types building step, I get errors if I import types from vue in a .ts file and use them in exported types or variables.

Example in a .ts file:

export type NumberRef = Ref<number>

Triggers the error: error TS4081: Exported type alias 'NumberRef' has or is using private name 'Ref'.

Other example:

export const count: Ref<number> = ref(1)

Triggers the error: error TS4025: Exported variable 'count' has or is using private name 'Ref'.

I provided a minimal reproduction based on vitesse, with this commit reflecting what I'm describing here, happening with pnpm build:types or pnpm build commands.

Reproduction

https://github.com/pascalgermain/vitesse/commit/fc47dec9a5ecbcbb139a66843ced975eba32e1a6

System Info

System:
    OS: macOS 14.1.2
    CPU: (10) arm64 Apple M2 Pro
    Memory: 453.52 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 21.4.0 - ~/.nvm/versions/node/v21.4.0/bin/node
    Yarn: 1.22.19 - ~/.nvm/versions/node/v21.4.0/bin/yarn
    npm: 10.2.5 - ~/.nvm/versions/node/v21.4.0/bin/npm
    pnpm: 8.12.0 - ~/.nvm/versions/node/v21.4.0/bin/pnpm
    bun: 1.0.17 - /opt/homebrew/bin/bun
  Browsers:
    Brave Browser: 120.1.61.100
    Chrome: 120.0.6099.71
    Safari: 17.1.2

Used Package Manager

pnpm

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A, please open a GitHub Discussion instead.
• The provided reproduction is a minimal reproducible of the bug.

Start with the linked vitesse reproduction commit and run pnpm build:types or pnpm build to confirm the TS4081 and TS4025 errors. Trace how vue-tsc --project handles exported types and variables in .ts files that use imported Vue types. Done means the minimal reproduction builds its types without these private-name errors and the regression is covered by an appropriate test.