v16.3.0-preview.6

Summary

Core Changes Enhance ESLint rule no-location-assign-relative-destination : #93057 Misc Changes Turbopack: order CSS modules by chunk-group co-occurrence in linearize: #95579 [test] Disable i18n-api-support deploy test for Turbopack with adapters: #95739 Fork navigation-testing-lock module: #95611 docs: runtime prefetching update: #95564 request insights: add agent diagnosis access (4/5): #93977 Fix Pages router 404 runtime rendering with Adapter: #95264 Fix duplicate static files in adapter: #95681 Update font data: #95725 [test] Disable middleware-rewrites deploy test for Turbopack with adapters: #95680 request insights: expose dev snapshots to tools and HMR (3/5): #93976 request insights: derive request history and fetch data (2/5): #93975 request insights: record local framework spans (1/5): #93974 Turbopack tests: remove assertions that duplicate webpack results: #95688 Fix support for custom-media-queries in LightningCSS: #95689 Clarify AI-assisted contribution policy in PR template and AGENTS.md: #95629 docs: add Building guide: #94999 docs: add incremental adoption path to Cache Components migration guide: #95325 [PPF] Sync IO is only allowed in the dynamic stage: #95384 refactor: remove unnecessary switches from StagedRenderingController: #95383 Keep the request body a plain Readable after middleware so Readable.toWeb() doesn't hang: #95607 docs: note default error/not-found UI follows OS color scheme, not app theme: #95673 test: skip redbox check in "static prefetch - missing suspense around search params": #95670 test: allow-runtime breaks Link's Server component child detection: #95596 docs: Immutable static assets: #95348 [turbopack] Simplify service worker e2e tests: #95672 [docs] Update "Handling a Custom Service Worker " in the CRA migration docs: #95434 [docs] Update progressive web apps documentation for new service worker syntax: #95431 (TypeScript 7 Support) Add experimental TypeScript CLI backend: #95639 [turbopack] Compile service workers registered from pages router pages: #95583 [turbopack] Output service workers to /_next/static/ : #95554 Reduce the size of OperationVc from 8 bytes to 4: #95614 Upgrade React from df4bd1b4-20260708 to 5123b063-20260708 : #95642 Add attribute rendering benchmark: #95621 docs(opengraph-image): load assets at module scope to keep route static under Cache Components: #95246 Convert agent-041's blocking-data check to the agentic LLM judge: #95630 Upgrade React from 12a4baec-20260707 to df4bd1b4-20260708 : #95612 Make the agent-rules block verifiable and self-upgrading: #95467 Refresh outdated agent-rules blocks on next dev and codemod upgrade: #95470 [ci] Split up large instant-validation tests: #95627 [ci] Split up large rsc-build-errors development test: #95624 [ci] split up large cache-components-errors tests: #95623 docs: update MCP guides for the thin next-devtools-mcp: #94859 Normalize and validate expire and revalidate values to handle Infinity and surface mistakes early: #95493 [ci] Bump PR stats job timeout to 35 minutes: #95592 [ci] Pin typescript version in tests: #95619 fix(create-next-app): render filenames in Geist Mono so the preloaded font is used: #95471 [turbopack] print Turbopack warnings after SSG: #95430 fix(create-next-app): pin both axes on Tailwind template logos to silence aspect-ratio warning: #95609 Turbopack: enable import with {type: 'text'} by default: #95606 Consistently gate navigation-testing-lock API on flag: #95582 test: Fix immutable static asset deployment tests for real: #95600 Upgrade React from 23def8fd-20260706 to 12a4baec-20260707 : #95581 Split remaining "client-node"-only modules into .browser variants: #95366 [turbopack] Don't evict when there is little memory to save: #95213 align dev and build output: #94916 [turbopack] Don't persist if there is little work to do: #95137 fix: log "Partial Prefetching enabled" during next build: #95593 [PP] Surface URL data during prefetching as an Instant insight with rule page: #95365 [turbopack] Rename rscEndpoint to rscHmrEndpoint : #95538 [ci] Split up large create-next-app/templates/matrix test: #95555 Turbopack: add more context to persistence file errors: #95318 [ci] Split up large cache-components-dev-warmup test suite: #95553 Cancel a superseded Server Components HMR refresh's server-side work: #95486 test: Fix immutable static asset deployment tests: #95550 [ci] Migrate webpack tests back to arm runners: #95549 docs: Fix testing-adapters variable name: #95575 test: Use Turbopack for 'Test new and changed tests when deployed': #95552 test: Disable service worker deploy tests for now: #95570 Fix/next info experimental analyze with graph css chunking: #95542 ci: Bump withgraphite/graphite-ci-action: #95562 Run instrumentation for Node.js Middleware without Adapter: #95547 Propagate maxDuration to edge adapter outputs: #95118 [ci] Skip apt-installed dependencies in playwright install step: #95535 test: Fix service worker error test: #95548 Upgrade to swc 72 and rust-react-compiler: #95536 [skills] Update gh-stack skill: #95541 docs: updates to Cache Components Caching: #95452 docs: remove incorrect statement that force-cache is the default for …: #95235 Turbopack: add all keys to dynamic exports before sealing the object: #93334 Disable supportsImmutableAssets with config.output : #95521 turbo-persistence: skip directory fsync on Windows: #95497 Abort superseded Server Components HMR requests on the client: #95463 [ci] Add stats comment with partial stats: #95401 [fragment-scroll] Enable new scroll handler by default: #95378 Upgrade React from 3508aee6-20260702 to 23def8fd-20260706 : #95532 fix(dev-overlay): increase fix card grid row gap to clear floating Copy prompt button: #95526 evals: fix false-negative regex checks with the agentic LLM judge: #95440 trace-viewer: Support string span ids in nextjs trace backend: #95515 [turbopack] Add E2E tests for service workers: #94924 otel: Use correct parent span for Node.js middleware: #95306 Fix instrumentation hook awaiting for middleware with adapters: #95357 [test] Unflake cache-components-dev-streaming test suite: #95466 Also rewrite requires in page templates with Webpack: #95446 Add serverComponentsHmrCancellation experimental flag: #95462 Avoid unnecessary rendering for validation in dev: #95394 fix: work around SWC compress bug: #95457 docs: Update FormEvent to SubmitEvent in form handling example (deprecated in React 19.2.10+): #95453 Update font data: #95441 Ignore-list internal frames whose source maps chain to original sources: #95448 Type resolved cacheLife profiles, dropping runtime asserts: #95428 Split typeof-window server requires into .browser variants: #95201 Collect modules with browser variants statically: #95200 Fix navigation getting reverted when a Server Action is in flight: #95391 Fix false-positive nested-cache error for a short default profile: #95373 Skip saving expire: 0 values in the default cache handler in prod: #95363 [ci] Disable mid-stack PR optimization for native PR stacks: #95427 Fix history push getting treated like replace when followed by refresh: #95392 Upgrade React from ec0fca31-20260701 to 3508aee6-20260702 : #95410 fix(config): correctly validate cacheHandlers names: #95358 [ci] Actually migrate Turbopack jobs back to ARM: #95386 Recover from blocking routes under Instant Navigation lock when deployed: #95227 Make Instant Navigation Testing full-page loads work when deployed: #95222 Clear a resurrected instant cookie on unlock so a hard reload recovers: #95398 fix: handle prototype-colliding segment names in segment explorer trie: #95403 Prefetch links nearest the top of the document first: #95393 Fix metadata title dropped on soft navigation with Cache Components: #95315 Cache short- expire 'use cache' values across dev reloads: #95362 [cd] Replace the release package with our own GitHub release creation: #95352 [test] Enable deploy tests for the Instant Navigation Testing API suite: #95236 Await reused in-flight prefetch entries under Instant Navigation lock: #95301 [test] Park the blocking-fallback segment on a withheld param: #95300 Make instant() resilient to a leaked navigation-testing cookie: #95375 [ci] Avoid running full CI mid-stack for GH-native stacks, same as we do for Graphite: #95218 Remove 'silence this warning' from instant validation fix output: #95187 fix(turbopack): allow #/ prefixed subpath import specifiers: #94461 [ci] Migrate Turbopack build_and_test jobs back to arm64, leave webpack jobs as x86-64: #95374 Rename DYNAMIC_EXPIRE and DYNAMIC_STALE to describe what they gate: #95361 Upgrade React from 92f4fda3-20260629 to ec0fca31-20260701 : #95368 Re-query deploy-test build logs until id markers appear: #95243 Fix early OTel proxy tracers in Cache Components prerenders: #95317 gitignore .next-profiles: #95256 Fix Navigation Inspector in Safari: #95329 Rename Copy as prompt to Copy prompt, convert FixOption to FixCard: #95309 codemod: bump eslint alongside eslint-config-next: #95314 docs: recommend explicit cacheLife and clarify overriding built-in cache profiles: #95311 test: Improve immutable static asset tests: #95349 Instant Navs guide: Highlights fixes and Client Component Page option: #95313 docs: Activity bfcacheId and :has caveats: #95275 [ci] Migrate some CI jobs back to x86-64, build both arm and x86-64 native binaries, include both os and architecture in native artifact names: #95341 [ci] Add optimize-ci, changes, and fetch-test-timings jobs to the needs list for the tests-pass job: #95339 [PP] Instant validation - error for unguarded static params: #94595 Revert "[ci] Move some test suites back to x86-64 runners to reduce pressure on our currently-limited pool of arm runners ( #95332 )": #95336 refactor: split out validateStaticShell: #95106 [ci] Move some test suites back to x86-64 runners to reduce pressure on our currently-limited pool of arm runners: #95332 [PP] Validate Shell prefetches (except gSP): #95151 Upgrade React from 68631c04-20260626 to 92f4fda3-20260629 : #95282 codemod: non-interactive upgrade for agents and CI: #95312 Fix workers on thread to not crash with napi-rs: #95281 [ci] Add support for auth based preview build registries: #95204 [ci] Migrate build_and_test and pull_request_stats to use arm64 runners: #94870 Turbopack: compute code hash per use cache function: #94234 [test] Retry the .next deletion to fix an ENOTEMPTY flake: #95307 [test] Make build-output-prerender error ordering deterministic: #95308 fix: params/searchParams in client page crashing dev instant validation: #95289 [test] Unskip more Turbopack NFT unit tests: #95297 [test] Recover from a leftover build process on test retry in build() : #95304 [test] Give webpack server-action-period-hash tests a larger timeout: #95303 Render a code frame for build errors thrown collecting page data: #95270 Surface empty generateStaticParams as a redbox with a real stack: #95269 Turbopack: constant evaluate x in y : #95286 docs: remove unnecessary async from rewrites/headers/redirects examples: #95148 Log content-free diagnostics when a postponed state fails to parse: #95216 log config evaluation time: #94811 Turbopack: This bool could've been an enum: #95288 Increase the code frame width used when logging to a file.: #95283 [ci] update relay-compiler to 21.0.1: #95217 [turbopack] Discover service workers in the Turbopack analyzer: #94923 [turbopack] Use experimental chunking heuristics: #95026 [turbopack] Set chunking_heuristics on each ChunkGroupInfo : #95021 [turbopack] Thread chunkingHeuristics through to chunk groups: #95020 [turbopack] Add an experimental chunkingHeuristics to next.config.js : #95019 test: fork select tests on partialPrefetching: #95279 Add docs for experimental.turbopackRustReactCompiler : #95280 Fix: Update the URL when a client navigation redirects to a rewritten route: #95207 Turbopack: replace cssChunking graph moduleFactorCost with weightDistribution : #95088 Upgrade React from 247fbb45-20260622 to 68631c04-20260626 : #95211 skills(cc-adoption): tighten requires, sequencing, terminology: #95225 Avoid bundling client-nodemodules used by unstable_rethrow in client-browser modules: #95196 fix(turbopack): dedupe filename/exportedName in server-reference-manifest worker entries: #95242 [ci] Display correct test commands when Cache Component test fail: #95267 fix: preserve repeated search params in client page segment cache keys: #94863 Improve typing of decodeReply : #95263 Turbopack: make hash_xxh3_hash128 return u128: #95232 [turbopack] Support undoable modifications for many field types on TaskStorage: #95180 Record size metrics to our compaction and persistence spans: #94977 Don't track modifications to transient data stored in tasks: #95133 fix: preserve middleware rewrite query in Pages API routes: #94905 Return APP_PAGE instead of PAGES for production Instant Navigation tests: #95184 [ci] skip Datadog git metadata upload on junit upload: #95210 next-dev-loop: require agent-browser >= 0.31.1: #95209 Bump Rust toolchain: #95205 docs(errors): reorder blocking-prerender-dynamic fixes to Stream, Cache, Block: #95198 Hard-navigate to app routes shadowed by a pages dynamic route: #95185 [dev overlay]: restructure Copy-as-prompt body into a step-by-step checklist: #95186 docs(insights): restructure error pages and link to preview docs: #95193 docs: fix preview message typo: #95050 Revert "[turbopack] Use final_read_hint in top level turbo tasks ( #94712 )": #95178 docs: update instant navs guide: #95173 [next-dev-loop] Fix cookies: #95177 Restore canary version 16.3.0-canary.67 after v16.3.0-preview.5 preview release Credits Huge thanks to @sokra , @eps1lon , @icyJoseph , @feedthejim , @mischnic , @vercel-release-bot , @wbinnssmith , @sampoder , @bgw , @aurorascharff , @lubieowoce , @timneutkens , @lukesandberg , @gaojude , @gaearon , @unstubbable , @Pranav18M , @andrewimm , @chippleh1392 , @M4cM4rco , @Partha-Shankar , @acdlite , @sleitor , @devjiwonchoi , @samselikoff , @jimmyhmiller , @thsid , @SukkaW , @TariqulislamTuhin , and @niketchandivade for helping!

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