Changing tsconfig and vite.config.ts at the same time causes a crash

[milomg]

Describe the bug

If both vite.config.ts and tsconfig.json are saved at the same time, the dev server crashes with

TypeError: Cannot read properties of null (reading 'ws')

The line that it errors on is here:

vite/packages/vite/src/node/plugins/esbuild.ts

Line 361 in b85802a

server.ws.send({

I would expect this is because the websocket is dropped at the same time the server tries to send an update

To trigger the crash, follow the reproduction link, then once the server is running create a new terminal tab and run touch tsconfig.json && touch vite.config.ts

Reproduction

https://stackblitz.com/edit/solid-vite-queyzr?file=vite.config.ts,tsconfig.json

System Info

System:
    OS: StackBlitz WebContainers

  npmPackages:
    vite: ^2.9.12 => 2.9.12

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 https://github.com/vuejs/core instead.
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• The provided reproduction is a minimal reproducible example of the bug.

[ZerdoX-x]

Yep. Most often this problem can be encountered when switching branches via git or when code editor autosaves your files on window loose focus.

upd: Also some users have set Ctrl+S as "save all files" and not "save file"