Addon-docs: MDX2 support

[shilman]

MDX has released version 2 with better parsing, improved speed, and security fixes.

We should provide opt-in support for MDXv2 in SB6.5 and completely move to MDXv2 in SB7.0.

[shilman]

closing as dupe to #17137 17137

[shilman]

Olé!! I just released https://github.com/storybookjs/storybook/releases/tag/v6.5.0-alpha.43 containing PR #17515 that references this issue. Upgrade today to the @next NPM tag to try it out!

npx sb upgrade --prerelease

[shilman]

Hey gang! A lot of you have been waiting a long time for MDXv2. I've released experimental support in Storybook 6.5 and would love your help to kick the tires. I've written up a short guide here and will update it with the latest as it stabilizes:

https://gist.github.com/shilman/6ff2d7e18db8846e8fc552fb432ae4f6

[julrich]

Hey gang! A lot of you have been waiting a long time for MDXv2. I've released experimental support in Storybook 6.5 and would love your help to kick the tires. I've written up a short guide here and will update it with the latest as it stabilizes:

https://gist.github.com/shilman/6ff2d7e18db8846e8fc552fb432ae4f6

This sounds great. Maybe the timing aligns, could really use that for documenting a major upcoming migration of our component library. Would love to use https://codehike.org/ for their great code sample components... but it's only MDXv2.
Will let you know if there's any feedback (not sure at what timeline you're looking at for feedback).

[shilman]

@julrich we're putting this out as experimental in 6.5 and it will become the default as a breaking change in SB7.0. If you run into any issues with it at any point, please let me know. At some point in the next few months I'd also love to demo you some MDX changes that we're making for 7.0 to see what you think.

[julrich]

Cool, looking forward to this!