devtools: MutationObserver is not defined in SSR

[mrwokkel]

Describe the bug
When using the windi devtools and starting op a dev server, I get the error:

[vite] Error when evaluating SSR module /@windicss/devtools:
ReferenceError: MutationObserver is not defined

Minimal Reproductions
https://github.com/mrwokkel/mutationobserver

Versions

• vite-plugin-windicss: ^1.4.11
• vite: ^2.6.7
• framework: @sveltejs/kit

Additonal Context
When loading virtual:windi-devtools in browser only, it works. But seems that should check on existence of MutationObserver before even starting.

[antfu]

What's the browser you are using?

[mrwokkel]

Chrome Version 94.0.4606.81 (Official Build) (x86_64).

[mrwokkel]

Problem is the Server Side Rendering part...