Add types to @mdx-js/preact

[ChristianMurphy]

mostly the same as mdx react typing https://github.com/mdx-js/mdx/blob/9a33ae598b9f84afa4f95e71f605a08c081e96bb/packages/react/types/index.d.ts
except:

• disable the disableParentContext property that mdx react has (not sure if it is supported in preact)
• adding configuration for jsxFactory so TypeScript looks at preact's h function for JSX scripting.

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[wooorm]

Thoughts on who could help review whether this is good? Can we reach out to the folks that contributed the mdx/preact?

[ChristianMurphy]

Can we reach out to the folks that contributed the mdx/preact?

Sounds like a plan

/cc @ChristopherBiscardi who contributed #955 to mdx preact
/cc @JounQin who contributed #1023 to mdx preact

[ChristopherBiscardi]

looks fine to me as long as it works with the new build stuff we're implementing (microbundle basically, which it does)

[wooorm]

Looks good to go, but there are conflicts

[johno]

Thanks!