Ensure the app shell is rendered before rendering the document

[shuding]

When concurrent features is enabled (React 18), we always render the documentStream before bodyResult, which results in the missing of head tags that should be collected from the app content (using Head).

This PR ensures that the initial app shell is always rendered before document.

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 by running yarn lint

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	shuding/next.js shu/66b9	Change
buildDuration	15.7s	15.6s	-84ms
buildDurationCached	6.2s	6.2s	-4ms
nodeModulesSize	467 MB	467 MB	⚠️ +3.19 kB

Page Load Tests Overall increase ✓

	vercel/next.js canary	shuding/next.js shu/66b9	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.144	3.1	-0.04
/ avg req/sec	795.26	806.43	+11.17
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.393	1.382	-0.01
/error-in-render avg req/sec	1794.63	1808.43	+13.8

Client Bundles (main, webpack)

	vercel/next.js canary	shuding/next.js shu/66b9	Change
925.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42 kB	42 kB	✓
main-HASH.js gzip	28.4 kB	28.4 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	72.1 kB	72.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	shuding/next.js shu/66b9	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	shuding/next.js shu/66b9	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	shuding/next.js shu/66b9	Change
_buildManifest.js gzip	460 B	460 B	✓
Overall change	460 B	460 B	✓

Rendered Page Sizes

	vercel/next.js canary	shuding/next.js shu/66b9	Change
index.html gzip	530 B	530 B	✓
link.html gzip	544 B	544 B	✓
withRouter.html gzip	524 B	524 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Default Build with SWC (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	shuding/next.js shu/66b9	Change
buildDuration	19.1s	18.9s	-191ms
buildDurationCached	6.1s	6.2s	⚠️ +22ms
nodeModulesSize	467 MB	467 MB	⚠️ +3.19 kB

Page Load Tests Overall increase ✓

	vercel/next.js canary	shuding/next.js shu/66b9	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.134	3.132	0
/ avg req/sec	797.65	798.27	+0.62
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.4	1.378	-0.02
/error-in-render avg req/sec	1785.86	1813.65	+27.79

Client Bundles (main, webpack)

	vercel/next.js canary	shuding/next.js shu/66b9	Change
925.HASH.js gzip	178 B	178 B	✓
framework-HASH.js gzip	42.3 kB	42.3 kB	✓
main-HASH.js gzip	28.8 kB	28.8 kB	✓
webpack-HASH.js gzip	1.45 kB	1.45 kB	✓
Overall change	72.7 kB	72.7 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	shuding/next.js shu/66b9	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	shuding/next.js shu/66b9	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	shuding/next.js shu/66b9	Change
_buildManifest.js gzip	458 B	458 B	✓
Overall change	458 B	458 B	✓

Rendered Page Sizes

	vercel/next.js canary	shuding/next.js shu/66b9	Change
index.html gzip	532 B	532 B	✓
link.html gzip	546 B	546 B	✓
withRouter.html gzip	526 B	526 B	✓
Overall change	1.6 kB	1.6 kB	✓

Commit: 47b1937

[ijjk]

Failing test suites

Commit: 47b1937

yarn testheadless test/e2e/prerender.test.ts

• Prerender > should handle manual revalidate for fallback: blocking

Expand output

● Prerender › should handle manual revalidate for fallback: blocking

expect(received).toMatch(expected)

Expected pattern: /(HIT|STALE)/
Received string:  "MISS"

  1982 |         const html2 = await res2.text()
  1983 |         const $2 = cheerio.load(html2)
> 1984 |         expect(res2.headers.get('x-nextjs-cache')).toMatch(/(HIT|STALE)/)
       |                                                    ^
  1985 |
  1986 |         expect(initialTime).toBe($2('#time').text())
  1987 |

  at Object.<anonymous> (e2e/prerender.test.ts:1984:52)

Read more about building and testing Next.js in contributing.md.