Describe the bug

Const enums used as types in casting disappear from the bundled output in Vite 8.0.13, whereas in Vite 8.0.12 they were still present as regular compiled enums.

not reproduced in rolldown repl directly

Reproduction

https://stackblitz.com/edit/vitejs-vite-kh3ktnpe?file=src%2Fmain.ts

Steps to reproduce

run npm i and npm run dev

System Info

System:
    OS: macOS 26.4.1
    CPU: (8) arm64 Apple M1 Pro
    Memory: 94.25 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 24.8.0 - /Users/danielwargh/.nvm/versions/node/v24.8.0/bin/node
    npm: 11.6.0 - /Users/danielwargh/.nvm/versions/node/v24.8.0/bin/npm
    bun: 1.3.14 - /opt/homebrew/bin/bun
    Deno: 2.6.5 - /Users/danielwargh/.deno/bin/deno
  npmPackages:
    @vitejs/plugin-basic-ssl: ^2.3.0 => 2.3.0
    @vitejs/plugin-react: ^6.0.1 => 6.0.1
    vite: 8.0.13 => 8.0.13

Used Package Manager

bun

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.