v13.4.0

Core Changes

• More fluent GraphTraversal API: #49028
• fix GlobalError interop and add test case: #49033
• Add flag to switch to the experimental channel: #48896
• Fix extra block element in body: #49034
• Fixed next-types-plugin causing Typescript errors when "type": "module" is set: #49027
• Fixed middleware's edge-chunks not being copied in copyTracedFiles: #48723
• Rename experimentalReact: #49046
• app router: don't unmount/remount on search param changes: #49047
• style: remove useless React.Fragment tag on next/image: #48997
• feat: add draft mode to next/headers: #48789
• Fix next dev failing for app when __NEXT_DISABLE_MEMORY_WATCHER is set: #49056
• fix(next-core): interop non string record values in env: #49057
• feat(next-core): support capsize for google font fallback: #48967
• chore: use includes replace indexOf: #48901
• feat: make enableUndici: true default and remove node-fetch: #49061
• fix(next_core): do not apply user config to internal assets: #48210
• update turbopack: #49071
• allow to use different blur placeholder modes: #49070
• Use route metadata to trace in node-file-trace: #49080
• fix quoted env vars from next config: #49090
• find and handle not-found page in app dir: #49095
• Update revalidate handling for app: #49062
• Update turbopack warning: #49051
• Add validation to server methods: #49104
• use ws instead of undici.WebSocket: #49100
• chore: rename draft mode enabled to isEnabled: #49096
• add test cases for error handling: #49093
• improve test case stability: #49036
• Optimize non-dynamic metadata routes to static in production build: #49109
• Allow setting runtime in layouts in type declarations: #49117
• Tweak app cache handling for paths: #49108
• add test case for non-enumerable exports: #49106
• Skip handler for POST requests when no action ID is found: #49119
• Fix edge runtime detection from layouts: #49126
• Fix cross-worker revalidate API: #49101
• app router: Fix infinite redirect loop in MPA navigation: #49058
• Only read digest from error instance: #49132
• Static generate dynamic sitemaps: #49114
• Remove writing vscode config: #49133
• Revert "Fix cross-worker revalidate API": #49138
• Revert "Revert "Fix cross-worker revalidate API" (#49138)": #49141
• fix(ts): make ReadonlyHeaders more compatible with Headers: #49075
• app-router: update prefetch heuristic to traverse until until we hit a loading boundary: #49077
• Forward response to edge runtime for response modification: #49145
• Polyfill Blob for Node.js < 18: #49156
• Update compilation target of @next/react-dev-overlay: #49153
• Fix CSS module imports not included in root not-found file: #49155
• app-router: fix stale cache handling: #49160
• Add support for app global and segment 404 pages: #49085
• Tests for Sass warnings: #49151
• Ensure latest react-dom types for experimental release channel are used: #49049
• Update cache methods for app dir: #49165
• Search for lockfiles to find Turbopack root: #49110
• Allow webpack config, but warn if no turbo config: #49170
• Add a generic type for unstable_cache: #49166
• Upgrade React to 18.3.0-canary-b7972822b-20230503: #49158
• Fix server component transforms: #49135
• Fix React channel env missing in custom server: #49168
• app router: support side effects on server requests: #48939
• Fix multipart/form-data handling in the Edge runtime: #49177
• Upgrade React to 18.3.0-canary-aef7ce554-20230503: #49181
• remove startup message by default: #49157
• add test case for bindings in member props: #49134
• Add test case for App Route cookies: #49124
• Fix standalone mode with appDir running in a single process: #49116
• Enable progressive enhanced form actions through decodeAction: #49187
• Use special annotation for $$bound if no closure argument is attached: #49188
• Add warning for missing metadataBase in social images: #49180
• Allow override icon rel: #49194
• actions: fix redirect on the edge: #49197
• update turbopack: #49196
• Fix incorrect React env in particular case: #49202
• Add SWC test cases: #49189
• action: add Readable.toWeb "polyfill" for node 16: #49201
• add missing alias for next/dynamic in app dir: #49199
• render app pages with original url: #49198
• action: support not found: #49209
• types: upgrade react/react-dom types: #49213
• Fix metadata routes prerender cache for standalone mode: #49208
• Turbopack alpha -> beta: #49103
• Enable App Router for all applications: #49088

Documentation Changes

• fix: wrong link in docs: #49001
• Simplify CNA prompts a bit: #49063
• Update create-next-app App Router question: #49111
• chore(docs): update next-image-unconfigured-host.md: #49175

Example Changes

• docs: Fix path of '.env.template': #49012
• chore: simplify repo templates: #49073

Misc Changes

• chore: Update swc_core to v0.75.41: #48982
• Fix failing test on canary branch: #49038
• Remove unused font from tailwind app/page.tsx: #49035
• Add test case for file uploads: #49048
• chore(cli): remove Route Handlers from App Router templates: #49076
• Fix flaky test: #49178
• disable optimistic_updates: #49211
• test: temporary disable flaky checking: #49217

Credits

Huge thanks to @kdy1, @alexkirsz, @sokra, @shuding, @dciug, @albertothedev, @DuCanhGH, @feedthejim, @li-jia-nan, @styfle, @kwonoj, @patrick91, @timneutkens, @balazsorban44, @ijjk, @padmaia, @Kikobeats, @huozhi, @sophiebits, @eps1lon, @reconbot, @acdlite, @jridgewell, and @sebmarkbage for helping!