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Looks like syntax highlighting doesn’t work: https://mdx-git-fork-christianmurphy-codemirror-6-mdx.vercel.app/playground/ anymore. I see some errors in the console from codemirror too

Thanks!
Took a bit to track that down.
Turns out the package lock file needs to be explicitly deduplicated when updating codemirror to ensure all the packages land on compatible versions.

Well, good news it fixed the site. 🎉
Bad news, it turned up a conflict between https://github.com/syntax-tree/estree-util-to-js/releases/tag/1.1.1 and vFile
and some changes to uvu and esbuild which appear to break us 😅

With a bit of lockfile surgery both the website and tests look happy.
Instead of a general npm upgrade, it uses npm update {individual codemirror package names} followed by npm dedupe.

Thank you!