feat(app): playground SSR device hints + L5 Cache Components prep - #175
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Restore mobile SSR theme hints on App playground routes via dedicated playground segment layouts and proxy Accept-CH headers. Enable cacheComponents and partialPrefetching incrementally with instant=false on runtime segments (root headers, session/i18n layouts).
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mkayander
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August 23, 2026 19:53
Restore single LocaleAppLayout at parent layouts instead of sibling (marketing)/playground shells that remounted tRPC/query providers on nav. Proxy sets x-dstruct-ssr-device-type on playground paths; LocaleAppLayout reads it. Add Accept-CH e2e, parseSsrDeviceTypeHeader tests, doc fixes.
Flatten pages back under (default-locale)/ and [lang]/ now that a single LocaleAppLayout handles all routes; the group had no layout or URL effect.
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# [1.387.0](v1.386.0...v1.387.0) (2026-08-23) ### Features * **app:** playground SSR device hints + L5 Cache Components prep ([#175](#175)) ([bfba2ca](bfba2ca))
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🎉 This PR is included in version 1.387.0 🎉 The release is available on GitHub release Your semantic-release bot 📦🚀 |
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Summary
Post–L3b next steps: restore playground mobile SSR device hints on App Router and begin L5 Instant Nav / Cache Components adoption.
Playground SSR device hints (regression fix from L2)
LocaleAppLayoutat(default-locale)/layout.tsxand[lang]/layout.tsx(no sibling segment layouts).x-dstruct-ssr-device-typeon playground paths;LocaleAppLayoutreads it forStateThemeProvider.Accept-CH: Sec-CH-UA-Mobileon playground responses.L5 Cache Components (incremental)
cacheComponents+partialPrefetching.instant = falseon root + locale layouts until runtime segments are cached/Suspense-split.Cleanup
(marketing)route group (pages flattened under(default-locale)/and[lang]/).Test plan
pnpm test— 464 unit testspnpm lint— cleanpnpm build— Cache Components enabledpnpm test:e2e— 18/18 (includes Accept-CH on/playground)pnpm preview-smoke— all greenNext steps (post-merge)
headers()locale readunstable_instant+@next/playwrightinstant()tests