Supporting Vite 6

[RobinTail]

So far so good. I tested it manually (on a project) and I ran the tests in this repo.
Some log messages have changed and the build command seem to be checking types in node_modules, so I disabled it with skipLibCheck.

Currently tested against v6.0.0-beta.0

[ArnaudBarre]

Hey thanks for this! I've done some changes in #208 to help fix the tests, the change in connected. message will be reverted soon.

Why are you currently testing Vite 6? Have you any interest in the new environment API?
For info it would not be release soon, but if you have any feedback on this you can join the discord!

[RobinTail]

Why are you currently testing Vite 6?

I like it when plugins for an important software are prepared for the major update of that software in advance.
I want this plugin to be ready when Vite 6 released, so that it would not be a blocker for migrating to Vite 6, @ArnaudBarre

[RobinTail]

The following workspace might require its own earlier version of rollup, because the one coming from vite (4.21.3) is not declared as a compatible one with @mdx-js/rollup — the latest version of which (3.0.1) is currently installed there needs v3 max. However, it still works anyway.

 WARN  Issues with peer dependencies found
playground/mdx
└─┬ @mdx-js/rollup 3.0.1
  └─┬ @rollup/pluginutils 5.0.2
    └── ✕ unmet peer rollup@^1.20.0||^2.0.0||^3.0.0: found 4.21.3