### What
#51394 introduced a pretty strict type of return value of route type
that causing failure with `next build`.
There're few ways of writing a app route, it could contain few return
values based on the usage:
* return a `Response` or promise of it
* return `NextResponse` of promise of it, since it's extended from
`Response`, same type
* use `redirect()` or `notFound(), since it returns `never`, and the
below code is not reached, the handler itself could still return void.
e.g. using `redirect` in a `GET` route
We loosed the type so `redirect()` can be still allowed without
specifying the return value there.
Related typescript issue:
https://github.com/microsoft/TypeScript/issues/16608#issuecomment-309327984
### How
* Re-enable the bail on types / build error in the app-routes tests
* Separate the tests, move runtime erroring ones to
`test/e2e/app-dir/app-routes-errors`
* Add new case to app-routes tests of mixed return value
Closes#55623
Related #55604
## 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>
Previously the app route handler was included in the server bundle, and called into user code to execute the underlying handler logic. This PR serves to move the handler code into the bundle so that the Node.js environment more closely matches the Edge environment.
This also updates the Rust code for the new loader.
fix NEXT-712 ([link](https://linear.app/vercel/issue/NEXT-712))
Previously the app route handler was included in the server bundle, and
called into user code to execute the underlying handler logic. This PR
serves to move the handler code into the bundle so that the Node.js
environment more closely matches the Edge environment.
fix NEXT-712 ([link](https://linear.app/vercel/issue/NEXT-712))
This adds updated matching handle for the server to separate out the matching and executing of different route types e.g. page routes, API routes, and app routes.
Co-authored-by: JJ Kasper <22380829+ijjk@users.noreply.github.com>
