chore(export)!: remove next export in favor of output: export in next.config.js

[styfle]

BREAKING CHANGE

Since next export has been printing a deprecation warning since #47376, its safe to remove in semver-major.

The upgrade path is to simply add output: 'export' in next.config.js - everything will continue to work the same.

This config greatly improves the next dev experience today. And in the future, it will improve performance of next build because we no longer need to do two passes (build then export).

[ijjk]

Tests Passed

[ijjk]

Stats from current PR

Default Build

General

	vercel/next.js canary	vercel/next.js styfle/next-1695-mark-next-export-as-deprecated	Change
buildDuration	10.7s	10.7s	N/A
buildDurationCached	6.3s	6.3s	N/A
nodeModulesSize	174 MB	174 MB	N/A
nextStartRea..uration (ms)	503ms	501ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js styfle/next-1695-mark-next-export-as-deprecated	Change
199-HASH.js gzip	27.9 kB	27.9 kB	N/A
3f784ff6-HASH.js gzip	53.2 kB	53.2 kB	N/A
99.HASH.js gzip	182 B	182 B	✓
framework-HASH.js gzip	45.5 kB	45.5 kB	✓
main-app-HASH.js gzip	254 B	252 B	N/A
main-HASH.js gzip	33 kB	33 kB	N/A
webpack-HASH.js gzip	1.75 kB	1.75 kB	N/A
Overall change	45.7 kB	45.7 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js styfle/next-1695-mark-next-export-as-deprecated	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js styfle/next-1695-mark-next-export-as-deprecated	Change
_app-HASH.js gzip	206 B	205 B	N/A
_error-HASH.js gzip	182 B	180 B	N/A
amp-HASH.js gzip	506 B	505 B	N/A
css-HASH.js gzip	322 B	323 B	N/A
dynamic-HASH.js gzip	2.59 kB	2.59 kB	✓
edge-ssr-HASH.js gzip	260 B	259 B	N/A
head-HASH.js gzip	350 B	350 B	✓
hooks-HASH.js gzip	369 B	369 B	✓
image-HASH.js gzip	4.38 kB	4.38 kB	N/A
index-HASH.js gzip	256 B	256 B	✓
link-HASH.js gzip	2.67 kB	2.67 kB	N/A
routerDirect..HASH.js gzip	316 B	318 B	N/A
script-HASH.js gzip	385 B	384 B	N/A
withRouter-HASH.js gzip	319 B	319 B	✓
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	3.99 kB	3.99 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js styfle/next-1695-mark-next-export-as-deprecated	Change
_buildManifest.js gzip	484 B	482 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js styfle/next-1695-mark-next-export-as-deprecated	Change
index.html gzip	528 B	529 B	N/A
link.html gzip	541 B	541 B	✓
withRouter.html gzip	523 B	524 B	N/A
Overall change	541 B	541 B	✓

Edge SSR bundle Size

	vercel/next.js canary	vercel/next.js styfle/next-1695-mark-next-export-as-deprecated	Change
edge-ssr.js gzip	95.8 kB	95.8 kB	✓
page.js gzip	158 kB	158 kB	N/A
Overall change	95.8 kB	95.8 kB	✓

Middleware size

	vercel/next.js canary	vercel/next.js styfle/next-1695-mark-next-export-as-deprecated	Change
middleware-b..fest.js gzip	624 B	622 B	N/A
middleware-r..fest.js gzip	150 B	151 B	N/A
middleware.js gzip	22.9 kB	22.9 kB	N/A
edge-runtime..pack.js gzip	1.92 kB	1.92 kB	✓
Overall change	1.92 kB	1.92 kB	✓

Commit: 1f57894

[socket-security]

Updated dependencies detected. Learn more about Socket for GitHub ↗︎

Packages	Version	New capabilities	Transitives	Size	Publisher
react-dom	18.3.0-canary-d803f519e-20231020...18.3.0-canary-a41957507-20231017	None	+4/-5	1.05 MB	react-bot
react	0.0.0-experimental-d803f519e-20231020...0.0.0-experimental-a41957507-20231017	None	+0/-0	433 kB	react-bot
scheduler	0.0.0-experimental-d803f519e-20231020...0.0.0-experimental-a41957507-20231017	None	+0/-0	117 kB	react-bot
scheduler	0.24.0-canary-d803f519e-20231020...0.24.0-canary-a41957507-20231017	None	+0/-0	117 kB	react-bot
react	18.3.0-canary-d803f519e-20231020...18.3.0-canary-a41957507-20231017	None	+0/-0	405 kB	react-bot
react-dom	0.0.0-experimental-d803f519e-20231020...0.0.0-experimental-a41957507-20231017	None	+4/-5	10.3 MB	react-bot