TypeError: dependentEntriesByModule.get is not a function in large builds (Vite 7.3.x)

[blackundo]

Describe the bug

Environment

• Vite: 7.3.1
• Rollup: 4.59.0
• Nuxt: 4.2.2
• Node: 20.x

Describe the bug

Build fails with TypeError: dependentEntriesByModule.get is not a function or its return value is not iterable when project has
2400+ modules.

Steps to reproduce

1. Large Nuxt 4.2.x project (2400+ modules)
2. Run nuxt build
3. After "✓ N modules transformed" → build fails with this TypeError

Workaround

// nuxt.config.ts
vite: {
  build: {
    rollupOptions: {
      treeshake: false  // disables tree shaking — increases bundle size
    }
  }
}

Expected behavior

Build completes successfully with tree shaking enabled.

Notes

- Error only occurs with 2400+ modules (small projects pass)
- Introduced in Vite 7.3.x (7.2.x was fine)
- dependentEntriesByModule appears to be an internal Rollup/CommonJS plugin API

### Reproduction

https://github.com/blackundo/m.ushort-frontend

### Steps to reproduce

_No response_

### System Info

```shell
System:
  OS: macOS 26.0.1
  CPU: (8) arm64 Apple M1
  Memory: 100.64 MB / 8.00 GB
  Shell: 5.9 - /bin/zsh
Binaries:
  Node: 25.2.1 - /opt/homebrew/bin/node
  Yarn: 1.22.21 - /opt/homebrew/bin/yarn
  npm: 11.6.2 - /opt/homebrew/bin/npm
  pnpm: 10.7.1 - /Users/blackundo/.npm-packages/bin/pnpm
Browsers:
  Safari: 26.0.1

Used Package Manager

npm

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to vuejs/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[github-actions]

Hello @blackundo. Please provide a minimal reproduction using a GitHub repository or StackBlitz. Issues marked with needs reproduction will be closed if they have no activity within 3 days.