Ensure generateBuildId is not required in config type

[ijjk]

This ensures none of the top-level config fields are required as this type is public and can be used for type checking now.

Fixes: #27428

Bug

• Related issues linked using fixes #number
• Integration tests added
• Errors have helpful link attached, see 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
• Integration tests added
• Documentation added
• Telemetry added. In case of a feature if it's used or not.
• Errors have helpful link attached, see contributing.md

Documentation / Examples

• Make sure the linting passes

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General

	vercel/next.js canary	ijjk/next.js fix/config-type	Change
buildDuration	15.4s	15.7s	⚠️ +279ms
buildDurationCached	3.6s	3.5s	-103ms
nodeModulesSize	49.5 MB	49.5 MB	✓

Page Load Tests Overall increase ✓

	vercel/next.js canary	ijjk/next.js fix/config-type	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.723	2.639	-0.08
/ avg req/sec	918.05	947.35	+29.3
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.448	1.432	-0.02
/error-in-render avg req/sec	1726.9	1746.17	+19.27

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js fix/config-type	Change
359.HASH.js gzip	2.96 kB	2.96 kB	✓
745.HASH.js gzip	180 B	180 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	21 kB	21 kB	✓
webpack-HASH.js gzip	1.53 kB	1.53 kB	✓
Overall change	67.9 kB	67.9 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js fix/config-type	Change
polyfills-HASH.js gzip	31.1 kB	31.1 kB	✓
Overall change	31.1 kB	31.1 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js fix/config-type	Change
_app-HASH.js gzip	803 B	803 B	✓
_error-HASH.js gzip	3.06 kB	3.06 kB	✓
amp-HASH.js gzip	554 B	554 B	✓
css-HASH.js gzip	329 B	329 B	✓
dynamic-HASH.js gzip	2.52 kB	2.52 kB	✓
head-HASH.js gzip	2.28 kB	2.28 kB	✓
hooks-HASH.js gzip	903 B	903 B	✓
image-HASH.js gzip	5.63 kB	5.63 kB	✓
index-HASH.js gzip	261 B	261 B	✓
link-HASH.js gzip	1.66 kB	1.66 kB	✓
routerDirect..HASH.js gzip	319 B	319 B	✓
script-HASH.js gzip	387 B	387 B	✓
withRouter-HASH.js gzip	320 B	320 B	✓
bb14e60e810b..30f.css gzip	125 B	125 B	✓
Overall change	19.1 kB	19.1 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js fix/config-type	Change
_buildManifest.js gzip	489 B	489 B	✓
Overall change	489 B	489 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js fix/config-type	Change
index.html gzip	530 B	530 B	✓
link.html gzip	544 B	544 B	✓
withRouter.html gzip	525 B	525 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Webpack 4 Mode (Decrease detected ✓)

General

	vercel/next.js canary	ijjk/next.js fix/config-type	Change
buildDuration	12.5s	12.5s	⚠️ +45ms
buildDurationCached	4.8s	4.8s	-76ms
nodeModulesSize	49.5 MB	49.5 MB	✓

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	ijjk/next.js fix/config-type	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.583	2.616	⚠️ +0.03
/ avg req/sec	967.88	955.61	⚠️ -12.27
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.478	1.501	⚠️ +0.02
/error-in-render avg req/sec	1691.89	1665.49	⚠️ -26.4

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js fix/config-type	Change
17.HASH.js gzip	2.98 kB	2.98 kB	✓
18.HASH.js gzip	185 B	185 B	✓
677f882d2ed8..HASH.js gzip	13.8 kB	13.8 kB	✓
framework.HASH.js gzip	41.9 kB	41.9 kB	✓
main-HASH.js gzip	8.4 kB	8.4 kB	✓
webpack-HASH.js gzip	1.22 kB	1.22 kB	✓
Overall change	68.5 kB	68.5 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js fix/config-type	Change
polyfills-HASH.js gzip	31.3 kB	31.3 kB	✓
Overall change	31.3 kB	31.3 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js fix/config-type	Change
_app-HASH.js gzip	791 B	791 B	✓
_error-HASH.js gzip	3.76 kB	3.76 kB	✓
amp-HASH.js gzip	552 B	552 B	✓
css-HASH.js gzip	333 B	333 B	✓
dynamic-HASH.js gzip	2.71 kB	2.71 kB	✓
head-HASH.js gzip	2.97 kB	2.97 kB	✓
hooks-HASH.js gzip	911 B	911 B	✓
index-HASH.js gzip	231 B	231 B	✓
link-HASH.js gzip	1.64 kB	1.64 kB	✓
routerDirect..HASH.js gzip	298 B	298 B	✓
script-HASH.js gzip	3.02 kB	3.02 kB	✓
withRouter-HASH.js gzip	294 B	294 B	✓
e025d2764813..52f.css gzip	125 B	125 B	✓
Overall change	17.6 kB	17.6 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js fix/config-type	Change
_buildManifest.js gzip	500 B	500 B	✓
Overall change	500 B	500 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js fix/config-type	Change
index.html gzip	577 B	577 B	✓
link.html gzip	589 B	589 B	✓
withRouter.html gzip	569 B	569 B	✓
Overall change	1.74 kB	1.74 kB	✓

Commit: ec5e7c9