chore(remix-dev): replace xdm with @mdx-js/mdx v2

[jacobwgillespie]

This PR addresses issue #1802 - xdm is now deprecated, and all functionality has been ported to @mdx-js/mdx.

Closes: #1802

• Docs
• Tests

Testing Strategy:

All existing tests pass with yarn test. Additionally, I created a playground and verified locally that mdx files still build as expected.

[changeset-bot]

🦋 Changeset detected

Latest commit: 43d47a4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 16 packages

Name	Type
@remix-run/dev	Patch
create-remix	Patch
remix	Patch
@remix-run/architect	Patch
@remix-run/cloudflare	Patch
@remix-run/cloudflare-pages	Patch
@remix-run/cloudflare-workers	Patch
@remix-run/css-bundle	Patch
@remix-run/deno	Patch
@remix-run/eslint-config	Patch
@remix-run/express	Patch
@remix-run/node	Patch
@remix-run/react	Patch
@remix-run/serve	Patch
@remix-run/server-runtime	Patch
@remix-run/testing	Patch

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[remix-cla-bot]

Hi @jacobwgillespie,

Welcome, and thank you for contributing to Remix!

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You may review the CLA and sign it by adding your name to contributors.yml.

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- The Remix team

[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[belgattitude]

Thanks, deasync is very problematic on my side and even more with vercel and node 18.

Would be very nice to include in the next release 🙏

[machour]

@jacobwgillespie could you please rebase this on latest dev and fix conflicts? I'll try to get eyes on this PR.

[jacobwgillespie]

@machour yep, rebased, thank you!

[MichaelDeBoey]

@jacobwgillespie I didn't look into it, but there's also @mdx-js/esbuild
https://mdxjs.com/packages/esbuild

Could this replace our own esbuild plugin or do we need to keep this custom one?

[jacobwgillespie]

Perhaps! I'm not super familiar with Remix's use of MDX internally, mostly just that xdm is deprecated and directly replaceable with @mdx-js/mdx.

[MichaelDeBoey]

Hi @jacobwgillespie!

Are you still interested in getting this one merged?

If so, please rebase onto latest dev & resolve conflicts

[jacobwgillespie]

@MichaelDeBoey Thanks for the ping, I have rebased onto the latest dev 👍

[jacobwgillespie]

I'm not sure why the tests are failing, it's upset about packages/remix-dev/modules.ts which I don't think is affected by this PR.

[jacobwgillespie]

Oh I see it, it's the new *.mdx types, let me take a look

[github-actions]

🤖 Hello there,

We just published version v0.0.0-nightly-b1149bb-20230810 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!