## 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>
### What
`export const runtime = 'experimental-edge'` also work for pages. This
PR add tests for that.
Closes NEXT-426
Follow up for #46631 that to fully remove all related code of the
`experimental.runtime`
## What
This fix serves to address issues where multiple `Set-Cookie` headers
were combined in some runtimes.
## Why
This is because `set-cookie` behaves differently than other headers in
some cases.
Eg. when iterating on a `Headers` instance, multiple set-cookie headers
are folded. To set them correctly, we need to split them. But it'd not
be enough to naively split on the first occurrence, because `,` is a
valid cookie value when for example it's used in `Expires` in a date
string.
So we use a method to correctly detect where to split the cookie.
This should fix all runtimes.
Note, the spec now has `Headers#getSetCookie` which should be preferred
if it's present. https://github.com/whatwg/fetch/pull/1346. We are using
the [`edge-runtime`](https://github.com/vercel/edge-runtime), so this
should be fixed upstream and then reused in Next.js in the future.
## How
Wherever we can, we reuse the `fromNodeHeaders` and `toNodeHeaders`
methods that have the correct implementation. This should be preferred
in the future in other parts of the codebase. We fixed some related TS
issues as well.
Fixes#46579, supersedes #40579
fix NEXT-735 ([link](https://linear.app/vercel/issue/NEXT-735))
---------
Co-authored-by: Balázs Orbán <info@balazsorban.com>
