ppr: ensure the router state tree is provided for interception routes

[ztanner]

What?

Interception routes on dynamic paths don't currently work when PPR is turned on, and instead trigger an MPA navigation to the full route.

Why?

Route interception relies on the Next-Flight-Router-State header to extract the dynamic params necessary to convert something like [locale], which would correspond with a URL of /en, to something like ["locale", "en", "d"]. (See this function for more info). When PPR is turned on, we currently ignore this request header and don't provide it to the functions that render the component tree.

Without the flight router state, this function bails out and instead will leave the segment key as [locale]. When the client router goes to diff the current tree on the client with the response from the server, it will detect a mismatch between the current segment and the incoming segment, and trigger an MPA navigation in this block.

How?

This special-cases interception routes to not strip this header.

Closes NEXT-2215

[ztanner]

• canary
  • ppr: ensure the router state tree is provided for interception routes #61059 👈

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[ijjk]

Stats from current PR

Default Build

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js 01-23-ppr_ensure_the_router_state_tree_is_provided_for_interception_routes	Change
buildDuration	11.7s	11.8s	⚠️ +127ms
buildDurationCached	5.9s	4.9s	N/A
nodeModulesSize	200 MB	200 MB	⚠️ +8.28 kB
nextStartRea..uration (ms)	425ms	433ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js 01-23-ppr_ensure_the_router_state_tree_is_provided_for_interception_routes	Change
193.HASH.js gzip	181 B	182 B	N/A
3f784ff6-HASH.js gzip	53.4 kB	53.4 kB	✓
411-HASH.js gzip	29.8 kB	29.8 kB	N/A
framework-HASH.js gzip	45.2 kB	45.2 kB	✓
main-app-HASH.js gzip	240 B	242 B	N/A
main-HASH.js gzip	31.8 kB	31.8 kB	N/A
webpack-HASH.js gzip	1.7 kB	1.7 kB	N/A
Overall change	98.6 kB	98.6 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js 01-23-ppr_ensure_the_router_state_tree_is_provided_for_interception_routes	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js 01-23-ppr_ensure_the_router_state_tree_is_provided_for_interception_routes	Change
_app-HASH.js gzip	194 B	195 B	N/A
_error-HASH.js gzip	183 B	181 B	N/A
amp-HASH.js gzip	504 B	502 B	N/A
css-HASH.js gzip	321 B	321 B	✓
dynamic-HASH.js gzip	2.5 kB	2.5 kB	N/A
edge-ssr-HASH.js gzip	255 B	253 B	N/A
head-HASH.js gzip	350 B	349 B	N/A
hooks-HASH.js gzip	369 B	369 B	✓
image-HASH.js gzip	4.18 kB	4.18 kB	N/A
index-HASH.js gzip	255 B	256 B	N/A
link-HASH.js gzip	2.61 kB	2.61 kB	✓
routerDirect..HASH.js gzip	312 B	311 B	N/A
script-HASH.js gzip	385 B	383 B	N/A
withRouter-HASH.js gzip	307 B	308 B	N/A
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	3.4 kB	3.4 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js 01-23-ppr_ensure_the_router_state_tree_is_provided_for_interception_routes	Change
_buildManifest.js gzip	484 B	485 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js 01-23-ppr_ensure_the_router_state_tree_is_provided_for_interception_routes	Change
index.html gzip	528 B	527 B	N/A
link.html gzip	541 B	540 B	N/A
withRouter.html gzip	524 B	523 B	N/A
Overall change	0 B	0 B	✓

Edge SSR bundle Size

	vercel/next.js canary	vercel/next.js 01-23-ppr_ensure_the_router_state_tree_is_provided_for_interception_routes	Change
edge-ssr.js gzip	94 kB	94 kB	N/A
page.js gzip	149 kB	149 kB	N/A
Overall change	0 B	0 B	✓

Middleware size

	vercel/next.js canary	vercel/next.js 01-23-ppr_ensure_the_router_state_tree_is_provided_for_interception_routes	Change
middleware-b..fest.js gzip	625 B	625 B	✓
middleware-r..fest.js gzip	151 B	151 B	✓
middleware.js gzip	37.6 kB	37.6 kB	N/A
edge-runtime..pack.js gzip	1.92 kB	1.92 kB	✓
Overall change	2.7 kB	2.7 kB	✓

Next Runtimes

	vercel/next.js canary	vercel/next.js 01-23-ppr_ensure_the_router_state_tree_is_provided_for_interception_routes	Change
app-page-exp...dev.js gzip	170 kB	170 kB	N/A
app-page-exp..prod.js gzip	95.6 kB	95.6 kB	N/A
app-page-tur..prod.js gzip	96.3 kB	96.3 kB	N/A
app-page-tur..prod.js gzip	90.9 kB	90.9 kB	N/A
app-page.run...dev.js gzip	142 kB	142 kB	N/A
app-page.run..prod.js gzip	90.2 kB	90.2 kB	N/A
app-route-ex...dev.js gzip	22.2 kB	22.2 kB	✓
app-route-ex..prod.js gzip	14.9 kB	14.9 kB	✓
app-route-tu..prod.js gzip	14.9 kB	14.9 kB	✓
app-route-tu..prod.js gzip	14.5 kB	14.5 kB	✓
app-route.ru...dev.js gzip	21.6 kB	21.6 kB	✓
app-route.ru..prod.js gzip	14.5 kB	14.5 kB	✓
pages-api-tu..prod.js gzip	9.41 kB	9.41 kB	✓
pages-api.ru...dev.js gzip	9.68 kB	9.68 kB	✓
pages-api.ru..prod.js gzip	9.4 kB	9.4 kB	✓
pages-turbo...prod.js gzip	22 kB	22 kB	✓
pages.runtim...dev.js gzip	22.6 kB	22.6 kB	✓
pages.runtim..prod.js gzip	22 kB	22 kB	✓
server.runti..prod.js gzip	49.7 kB	49.7 kB	✓
Overall change	247 kB	247 kB	✓

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Commit: fbfd7b5