fix(document): accepts nodearray for head's children

[kwonoj]

This PR attempts to amends #35390.

There's new property 'children' in OriginProps : https://github.com/vercel/next.js/blob/canary/packages/next/pages/_document.tsx#L22 which overwrites default prop's children defined at https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/react/index.d.ts#L504. Those 2 are incompatible, especially new one doesn't allow iterable children which results multiple children in head tag makes compilation fails.

PR matches type of new property same as default, then apply some workaround to bend over internal check logics. I'm not sure if it's worth to apply strict types as much or just bend it via any casting, PR tried to be strict as much.

Bug

• closes Custom document's head throws error with multiple children #35390

• Related issues linked using fixes #number

• Integration tests added

• Errors have helpful link attached, see contributing.md

test is added in #35426

[ijjk]

Stats from current PR

Default Build (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	kwonoj/next.js fix-type-children-head	Change
buildDuration	13.6s	14.5s	⚠️ +962ms
buildDurationCached	5.8s	5.3s	-515ms
nodeModulesSize	456 MB	456 MB	⚠️ +249 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	kwonoj/next.js fix-type-children-head	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.898	2.986	⚠️ +0.09
/ avg req/sec	862.54	837.15	⚠️ -25.39
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.275	1.32	⚠️ +0.05
/error-in-render avg req/sec	1960.92	1894.02	⚠️ -66.9

Client Bundles (main, webpack)

	vercel/next.js canary	kwonoj/next.js fix-type-children-head	Change
925.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42 kB	42 kB	✓
main-HASH.js gzip	28 kB	28 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	71.6 kB	71.6 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	kwonoj/next.js fix-type-children-head	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	kwonoj/next.js fix-type-children-head	Change
_app-HASH.js gzip	1.36 kB	1.36 kB	✓
_error-HASH.js gzip	192 B	192 B	✓
amp-HASH.js gzip	309 B	309 B	✓
css-HASH.js gzip	327 B	327 B	✓
dynamic-HASH.js gzip	2.57 kB	2.57 kB	✓
head-HASH.js gzip	351 B	351 B	✓
hooks-HASH.js gzip	920 B	920 B	✓
image-HASH.js gzip	5.48 kB	5.48 kB	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	2.26 kB	2.26 kB	✓
routerDirect..HASH.js gzip	320 B	320 B	✓
script-HASH.js gzip	387 B	387 B	✓
withRouter-HASH.js gzip	319 B	319 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	15.2 kB	15.2 kB	✓

Client Build Manifests

	vercel/next.js canary	kwonoj/next.js fix-type-children-head	Change
_buildManifest.js gzip	460 B	460 B	✓
Overall change	460 B	460 B	✓

Rendered Page Sizes

	vercel/next.js canary	kwonoj/next.js fix-type-children-head	Change
index.html gzip	531 B	531 B	✓
link.html gzip	545 B	545 B	✓
withRouter.html gzip	525 B	525 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Default Build with SWC (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	kwonoj/next.js fix-type-children-head	Change
buildDuration	17.9s	16.4s	-1.5s
buildDurationCached	5.2s	5.3s	⚠️ +67ms
nodeModulesSize	456 MB	456 MB	⚠️ +249 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	kwonoj/next.js fix-type-children-head	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.822	2.732	-0.09
/ avg req/sec	885.94	914.92	+28.98
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.211	1.22	⚠️ +0.01
/error-in-render avg req/sec	2064.9	2048.83	⚠️ -16.07

Client Bundles (main, webpack)

	vercel/next.js canary	kwonoj/next.js fix-type-children-head	Change
925.HASH.js gzip	178 B	178 B	✓
framework-HASH.js gzip	42.3 kB	42.3 kB	✓
main-HASH.js gzip	28.2 kB	28.2 kB	✓
webpack-HASH.js gzip	1.45 kB	1.45 kB	✓
Overall change	72.1 kB	72.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	kwonoj/next.js fix-type-children-head	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	kwonoj/next.js fix-type-children-head	Change
_app-HASH.js gzip	1.35 kB	1.35 kB	✓
_error-HASH.js gzip	179 B	179 B	✓
amp-HASH.js gzip	313 B	313 B	✓
css-HASH.js gzip	324 B	324 B	✓
dynamic-HASH.js gzip	2.56 kB	2.56 kB	✓
head-HASH.js gzip	351 B	351 B	✓
hooks-HASH.js gzip	921 B	921 B	✓
image-HASH.js gzip	5.59 kB	5.59 kB	✓
index-HASH.js gzip	261 B	261 B	✓
link-HASH.js gzip	2.33 kB	2.33 kB	✓
routerDirect..HASH.js gzip	322 B	322 B	✓
script-HASH.js gzip	388 B	388 B	✓
withRouter-HASH.js gzip	317 B	317 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	15.3 kB	15.3 kB	✓

Client Build Manifests

	vercel/next.js canary	kwonoj/next.js fix-type-children-head	Change
_buildManifest.js gzip	458 B	458 B	✓
Overall change	458 B	458 B	✓

Rendered Page Sizes

	vercel/next.js canary	kwonoj/next.js fix-type-children-head	Change
index.html gzip	531 B	531 B	✓
link.html gzip	546 B	546 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.6 kB	1.6 kB	✓

Commit: 2e748f9