Build optimization breaks code (Removes necessary break from switch)

[DeepDoge]

Describe the bug

Build optimization is removing break keyword from switch statement where it shouldn't.
I'm not sure if this is a Vite, Rollup or Typescript issue.

Reproduction

https://github.com/DeepDoge/vite-breaks-switch/blob/master/src/main.ts

Steps to reproduce

• Clone the repo.
• npm i
• npm run dev
• • Console logs "normally it should exit after this, without any errors"
• npm run build
• npm run preview
• • Console logs "normally it should exit after this, without any errors"
• • Then throws "error 3" (this shouldn't happen)

System Info

System:
    OS: Linux 5.15 Debian GNU/Linux 11 (bullseye) 11 (bullseye)
    CPU: (8) x64 Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz
    Memory: 5.93 GB / 15.44 GB
    Container: Yes
    Shell: 5.1.4 - /bin/bash
  Binaries:
    Node: 18.14.0 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 9.3.1 - /usr/local/bin/npm
  npmPackages:
    vite: ^4.2.0 => 4.2.1

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.

[sapphi-red]

This is a bug in rollup.
Here's a reproduction only with rollup: rollup repl
Would you report to rollup?

[DeepDoge]

@sapphi-red thank you, i will

[DeepDoge]

opened the issue here rollup/rollup#4930