Replace xdm with MDX v2

[silvenon]

What: xdm is being replaced with MDX v2. The breaking change is that xdmOptions has been renamed to mdxOptions.

Why: xdm was created before MDX v2 as a project that contains everything that Titus, the core maintainer of MDX, wanted to have in MDX. With the release of MDX v2 the projects are now "99.99% the same", and Titus will retire xdm.

How: it was enough to replace xdm with @mdx-js/esbuild, it even exports the ProcessorOptions needed in types.d.ts, so there was no need to install @mdx-js/mdx as well. The documentation was updated in the way that made sense to me. The only uncomfortable change is renaming xdmOptions to mdxOptions, but I believe it's necessary.

Checklist:

• Documentation
• Tests
• Ready to be merged
  

Resolves #137, #159.

[marcofranssen]

Resolves #159

When can we expect a release of this Fix/Version bump?

[silvenon]

(…) but I would be willing to look at a PR for it

—#137 (comment)

I think Kent instantly regretted saying this 🤣 😜

[Arcath]

Running this branch locally and the tests are hanging on coverage, do you get the same thing?

I'm happy to rename xdmOptions to mdxOptions as we are changing package. It will prompt users to come to the releases page and see that the underlying parser/render has changed.

[Arcath]

I'd also suggest that we implement the relatively minor #167 in this PR as well so its a single breaking change release.

@silvenon I have an uncomitted version of this PR with those changes made if that works for you? Same question to @kentcdodds

[silvenon]

Running this branch locally and the tests are hanging on coverage, do you get the same thing?

I did not run the tests, I wanted to defer to the CI 😅 It's indeed hanging on the coverage part for me too, but I'm experiencing the same problem on main 🤔

I have an uncomitted version of this PR with those changes made if that works for you?

Absolutely!

[codecov]

Codecov Report

Merging #152 (94844e3) into main (61c1a34) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #152   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          280       280           
  Branches         1         1           
=========================================
  Hits           280       280           

Impacted Files	Coverage Δ
src/index.js	100.00% <100.00%> (ø)

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[kentcdodds]

Looks like we're good to roll here! Will merge this as a breaking change. Thanks so much!

[kentcdodds]

LGTM! 👏👏

[silvenon]

Awesome! Many thanks for reviewing this ❤️

[github-actions]

🎉 This PR is included in version 9.0.0 🎉

The release is available on:

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• GitHub release

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