Description

In this merge request, https://github.com/vitejs/vite/pull/14632/files#diff-abb3345b6e3b2ec6d297c2ebc54cca85ae4487a31bac3cc9e78457f5114adb26R704 @antfu introduced object in middlewareMode property, but at that line of code this property is always boolean. That's why proxy WS is not working for Vite middleware mode.

Additional context

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines, especially the Pull Request Guidelines.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Update the corresponding documentation if needed.
• Ideally, include relevant tests that fail without this PR but pass with it.