Misc Changes

• Anchor the async local storage instances to global symbols: #97255
• test: deflake use-cache-size-zero warm reload: #97421
• Scaffolding for concurrentRouterQueue flag: #97413
• Reorganize client router modules: #97402

Credits

Huge thanks to @unstubbable, @gnoff, and @acdlite for helping!

Misc Changes

• Wait for back-before-hydration recoveries in the browser: #97321
• Extract metadata resolution primitives: #97388
• test: update React 18 redbox snapshot: #97415
• Turbopack: retain conditions when replacing resolve request keys: #97372
• Remove server route matcher stack: #94157

Credits

Huge thanks to @gaearon, @gnoff, @timneutkens, and @mischnic for helping!

Misc Changes

• Adopt SelectedMetadata for metadata rendering: #97387
• fix(next/image): reject empty image on read/write to disk cache : #97278
• Turbopack: remove stale manifests for deleted routes: #97333
• Turbopack: make unreachable codegen more generic: #97385

Credits

Huge thanks to @gnoff, @styfle, @marcoshernanz, and @mischnic for helping!

Misc Changes

• Upgrade React from 22e4f993-20260811 to eb8feb71-20260814: #97382

Misc Changes

• Turbopack: add imports_wildcard NFT unit test: #97373
• Turbopack: improve chunk_item_content docs: #97370
• Turbopack: don't trace embedded WASM loader helpers: #97353
• test: Reenable i18n-api-support deploy test for Turbopack with adapters: #96898
• Trace instrumentation startup: #97296
• Trace route module preparation: #97295
• Trace route module loading: #97318
• fix(deps): bump satori and @vercel/og: #97276
• Scope app-entry export validation to files inside the app directory: #97350
• Emit whole-app server NFTs when output: 'standalone' is used with an adapter: #97287
• [test] Cover 'use cache: private' in route handlers: #97349
• Fix missing Pages runtime in adapter Pages API outputs: #96819
• docs: align SPA guide reducer example with React conventions: #97341
• Update blob version.: #97342

Credits

Huge thanks to @mischnic, @DavidIlie, @styfle, @unstubbable, @bryan-ferry, @timneutkens, @aurorascharff, and @gdborton for helping!

What's Changed

• [16.x] Turbopack: don't strip async-module runtime from shared runtime chunks by @lukesandberg in #96653
• [16.x] [turbopack] Add turbopack_ecmascript and turbopack_wasm's embeded FS to internal_assets_conditions by @lukesandberg in #96655
• [16.x] [turbopack] Collapse nested promises in the analyzer by @sampoder in #96675
• [16.x] fix(next/image): preserve image response after optimization by @styfle in #96733
• [16.3.x] Default deploy e2e tests to the repo next version by @eps1lon in #96900
• [backport] Bump @swc/helpers by @mischnic in #96885
• [backport] [turbopack] Raise registration calls in hoisted modules to the top by @lukesandberg in #97308
• [backport] Fix missing styled-jsx styles in Pages Router SSR on adapter builds by @lukesandberg in #97302
• [backport] [turbopack] Fix HMR for dynamic imports evaluated from layouts by @lukesandberg in #97317
• [backport] Restore the live headers() view of the incoming request by @unstubbable in #97311
• [backport] Allow literal exports in 'use cache' files by @unstubbable in #97312
• [backport] Keep the dev validation worker alive across HMR updates by @unstubbable in #97315
• [backport] Discard only cache entries that predate a tag revalidation, and reuse completed entries by @unstubbable in #97314
• [backport] Encode the cache item name built by unstable_cache by @unstubbable in #97313
• [16.3] [ci] Use OIDC tokens to read private preview builds by @eps1lon in #97258
• [backport] [test] Compile the middleware redirect routes up front in dev by @lukesandberg in #97328
• [backport] Fix Nav Inspector request loop on repeat captures by @acdlite in #97326
• [backport] Fix: Optimistic routing bugs leading to repeated prefetch loops by @acdlite in #97325
• [backport] Retain fewer stale cache versions and use a TTL, plus the mtime fallback by @lukesandberg in #97304
• [backport] Revert i18n localization change for dynamic Pages API routes (#94905) by @gaojude in #97330

Full Changelog: v16.3.0...v16.3.1

Misc Changes

• Unify how a response's shell and full payloads are written: #96878
• Convert per-segment prefetches to NavigationFlightResponse format: #96877
• Unify how server responses are written into the client cache: #96876
• Convert tree prefetches to NavigationFlightResponse format: #96788
• Revert i18n localization change for dynamic Pages API routes (#94905): #97327
• fix(next/image): skip 0-byte entries when initializing disk LRU cache: #94068
• Update authentication diagram URL: #97320
• Add a script for adopting fork pull requests: #97252
• Migrate napi-rs bindings from v2 to v3: #95412
• Upgrade React from 11eddecd-20260805 to 22e4f993-20260811: #97249
• Add RDC compression rollout controls: #97247
• [testmode] Fix infinite recursion in testmode passthrough fetch: #96525

Credits

Huge thanks to @acdlite, @gaojude, @hammadxcm, @marcoshernanz, @eps1lon, @jimmyhmiller, @gnoff, and @lazerg for helping!

Misc Changes

• test: fix 'ouput' typo in parseIdsFromCliOutput: #97266
• Add the mtime fallback back: #97268
• Allow issue participants to request reopening: #96947
• [turbopack] Document clusters for chunking: #97267
• Link to issues in the contribution guide and discourage trivial PRs: #97188
• Stop serializing hmr version state: #97146
• [turbopack] Add clusters to chunking heuristics: #95157
• [test] Redirect the deployment host in-process for proxy deploy tests: #97260
• [test] Unflake two cache-components-dev-streaming assertions: #97246
• [test] Unflake use-cache-default-profile-expire-zero tests: #97250
• [turbopack] Fix HMR for dynamic imports evaluated from layouts: #97213
• [ci] Use OIDC tokens to read private preview builds: #96919
• Allow running ncc before pnpm build: #97234
• Invalidate deferred Webpack entry sources: #97205

Credits

Huge thanks to @syedsohailhussain1, @lukesandberg, @marcoshernanz, @sampoder, @unstubbable, @eps1lon, and @gnoff for helping!

Core Changes

• Fix debug build paths Pages Router support entries: #93529

Misc Changes

• Restore the live headers() view of the incoming request: #97166
• [test] Compile the middleware redirect routes up front in dev: #97190
• Update gh-stack skill guidance: #97163
• [test] Unflake use-cache-custom-handler-dev tests: #97187
• Forward a build-container pin to deploy-test deployments: #97191
• Fix unset crossOrigin in Turbopack manifests: #97164
• Allow literal exports in 'use cache' files: #97181
• Fix shared Turbopack runtime initialization race: #97215
• Fix stale data after navigation despite revalidation: #95439
• [turbopack] Only use the shared runtime by default on canary: #97208

Credits

Huge thanks to @unstubbable, @timneutkens, @Stanzilla, @gnoff, @gaearon, and @sampoder for helping!

Misc Changes

• Decouple loader tree construction from children ordering: #97192
• [turbopack] Retain fewer stale cache versions and use a TTL: #96941
• Bump lightningcss: #97159

Credits

Huge thanks to @gnoff, @lukesandberg, and @mischnic for helping!