Describe the bug

I migrated a node.js project using tsdown to vite+ and noticed that tsdown's shims are not bundled with the vite+ installation. When running vp pack with shims: true the command fails because the build process cannot find node_modules/tsdown/esm-shims.js.

The shims are used for transforming __dirname and __filename references for ESM compatibility

In tsdown esm-shims.js is a static file currently sitting at the root of the repository

Reproduction

https://github.com/alexfigliolia/vite-plus-minimal-reproduction

Steps to reproduce

1. Create a small node.js project and configure the vite+ pack options to specify shims: true.
2. Create file to build that uses the __filename or __dirname global
3. Run vp pack

System Info

VITE+ - The Unified Toolchain for the Web

Environment:
  Version  24.14.0
  Source   lts

Tool Paths:
  node  /.vite-plus/js_runtime/node/24.14.0/bin/node
  npm   /.vite-plus/js_runtime/node/24.14.0/bin/npm
  npx   /.vite-plus/js_runtime/node/24.14.0/bin/npx



VITE+ - The Unified Toolchain for the Web

vp v0.1.12

Local vite-plus:
  vite-plus  v0.1.12

Tools:
  vite             v8.0.0
  rolldown         v1.0.0-rc.9
  vitest           v4.1.0
  oxfmt            v0.40.0
  oxlint           v1.55.0
  oxlint-tsgolint  v0.17.0
  tsdown           v0.21.3

Environment:
  Package manager  yarn v4.0.2
  Node.js          Not found

Used Package Manager

yarn

Logs

error: Build failed with 1 error:

[UNRESOLVED_IMPORT] Error: Could not resolve '<project>/node_modules/@voidzero-dev/vite-plus-core/dist/esm-shims.js' in <project>/<file-using-__dirname-or__filename>

Validations

• Read the Contributing Guidelines.
• Check that there isn't already an issue for the same bug.
• Confirm this is a Vite+ issue and not an upstream issue (Vite, Vitest, tsdown, Rolldown, or Oxc).
• The provided reproduction is a minimal reproducible example.