### What
Apply the react aliases for app dir also to the files with
`pagesExtension`
### Why
In the page bundle of mdx page:
In RSC layer react is referencing to the insatlled react 18.2.0 's
`jsx-runtime` to create each JSX element. The react 18.2 JSX runtime
access `propTypes` of the component type and then it crashes 💥
In RSC layer it should use the built-in react canary's `jsx-runtime`.
The reason that it didn't use the built-in one is we're using customized
`pageExtension` `["mdx"]` for mdx, where we didn't apply all these rules
for the files with `pageExtension`, but only the js and ts files by
default.
For mdx specifically, we cannot only applied to
`(page|layout|route).[page extension]` cause every mdx file needs to
have proper resolution. Since this doesn't break transform, it's safe to
apply for all files with page extension.
Fixes#58888
Closes NEXT-3187
## What?
Removes `experimental.appDir` this was leftover from when I flipped the
switch.
Kept the config file as in the future we might add future flags and
such. It also helps that it has the types comment included so you always
get types.
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---------
Co-authored-by: JJ Kasper <jj@jjsweb.site>
Adds additional integration tests for `@next/mdx`.
- Test mdx-rs
- Test `mdx-components.tsx`
- Tests development and production. Previously it only checked
development.
<!--
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-->
## Bug
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have a helpful link attached, see
[`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md)
## Feature
- [ ] Implements an existing feature request or RFC. Make sure the
feature request has been accepted for implementation before opening a
PR.
- [ ] Related issues linked using `fixes #number`
- [ ]
[e2e](https://github.com/vercel/next.js/blob/canary/contributing/core/testing.md#writing-tests-for-nextjs)
tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have a helpful link attached, see
[`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md)
## Documentation / Examples
- [ ] Make sure the linting passes by running `pnpm build && pnpm lint`
- [ ] The "examples guidelines" are followed from [our contributing
doc](https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md)
---------
Co-authored-by: Shu Ding <g@shud.in>
