## What
Using methods from `next/headers` in middleware would throw a `requestAsyncStorage` invariant. Additionally, using `draftMode()` in middleware/an edge runtime is not possible
## Why
We do not expose `requestAsyncStorage` to the middleware adapter. Also, the prerender manifest wasn't available to the `EdgeRouteModuleWrapper` & middleware adapter, so it wasn't possible to enable/disable it.
## How
This makes `requestAsyncStorage` available for middleware, and makes the preview mode data available from build to the edge runtime/middleware.
Fixes#52557
After enabling Draft Mode, `router.refresh()` was incorrectly causing the page to crash and do a full page refresh.
This PR fixes this case.
Co-authored-by: Steven <229881+styfle@users.noreply.github.com>
## 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>
