v15.6.0-canary.3

Core Changes

• fix: dev should produce the correct default fallback regex to match builds/Turbopack: #83701
• [devtool] fix overlay styles are missing: #83721
• Revert "Remove clientParamParsing requirement from RDC for Navigations": #83725
• Only enable unhandledRejection filtering when opted in: #83726

Misc Changes

• tests: disable flaky deployment test while investigating upstream: #83705
• [test] Update snapshots for Rspack + React 18: #83712
• Docs/sep paper cuts: #83689

Credits

Huge thanks to @ztanner, @unstubbable, @icyJoseph, @huozhi, and @gnoff for helping!

v15.6.0-canary.2

Core Changes

• Remove clientParamParsing requirement from RDC for Navigations: #83661
• Upgrade React from 6b70072c-20250909 to 886b3d36-20250910: #83650
• Turbopack: Use readFileSync / writeFileSync for manifest writing: #83694
• Upgrade React from 886b3d36-20250910 to f3a80361-20250911: #83696
• Don't create client-side debug channel if the feature is disabled: #83699

Misc Changes

• [CI] Fix GitHub Actions matrix configuration for React versions: #83677
• fix(Turbopack): Enable scope hoisting for large files or module counts: #83399
• [turbopack] Lazily construct resolved::Requests for EsmAssetReference: #83662
• Update content-security-policy.mdx, fix development environment error: #83665

Credits

Huge thanks to @unstubbable, @wyattjoh, @Cy-Tek, @timneutkens, @lukesandberg, and @OoMNoO for helping!

v15.6.0-canary.1

Core Changes

• Development: Don't import app-router / hot-reloader through next/link in application code: #83656

Misc Changes

• Turbopack: Only load capsize-font-metrics once: #83654

Credits

Huge thanks to @timneutkens for helping!

v15.6.0-canary.0

Misc Changes

• Turbopack: remove css_environment from Environment: #83487
• Turbopack: Don't add client_runtime_entries to Route Handler compilation: #83655

Credits

Huge thanks to @mischnic and @timneutkens for helping!

v15.5.3

Note

This release is backporting bug fixes. It does not include all pending features/changes on canary.

Core Changes

• fix: validation return types of pages API routes (#83069)
• fix: relative paths in dev in validator.ts (#83073)
• fix: remove satisfies keyword from type validation to preserve old TS compatibility (#83071)

Credits

Huge thanks to @bgub for helping!

v15.5.1-canary.39

Core Changes

• [metadata] change the metadata routes params to promises: #83560

Credits

Huge thanks to @huozhi for helping!

v15.5.1-canary.38

Core Changes

• Ignore unhandledRejection events for promises that reject after a React render aborts: #83590
• Update font data: #83631
• [dev] Serve static metadata from filesystem: #83460

Misc Changes

• Turbopack: run NFT unit test: #83233

Credits

Huge thanks to @gnoff, @vercel-release-bot, @devjiwonchoi, and @mischnic for helping!

v15.5.1-canary.37

Core Changes

• Development: Make 'ready in' 195ms faster: #83628

Credits

Huge thanks to @timneutkens for helping!

v15.5.1-canary.36

Core Changes

• Exit next dev with a non-zero code when next.config.js is invalid: #83602
• Development: Only load getStaticInfoIncludingLayouts when it's needed: #83555
• Development: Only load HotReloaderWebpack when it is used: #83609
• Fix logic bug in sortByPageExts: #83610
• Update PPR cases with adapter config: #83595
• Development: Don't load Babel when it's not used: #83619
• Development: Don't load hot-reloader-webpack when using Turbopack: #83621
• Development: Only require loadJsConfig when using webpack: #83623
• Upgrade React from b9a04536-20250904 to 6b70072c-20250909: #83627

Example Changes

• examples(with-supabase): fix import statement in tutorial: #83605

Misc Changes

• Enable more tests for Turbopack: #83589
• Enable more tests for Turbopack, II: #83600
• chore: remove $ from cli cmd: #83603
• Tests: Move build-indicator test to test/development: #83591
• docs: rewrite+usePathname+prerender hydration error mitigation: #83462

Credits

Huge thanks to @mischnic, @icyJoseph, @timneutkens, @tomhmoses, @unstubbable, and @ijjk for helping!

v15.5.1-canary.35

Core Changes

• Update types and more test coverage for adapters: #82919
• fix: devtools initial position should be from next config: #83571

Misc Changes

• [turbopack] Simplify up and dowcasts: #83456
• Turbopack: remove unused transforms: #83567
• Turbopack: emit JSON.parse only for more than 10kb: #83483
• cna: fix typo: #83121
• Fix build-indicator test flaking: #83585
• Turbopack: remove GlobalTypeofs AST pass: #83479
• Turbopack: don't define process.cwd() in node_modules: #83452

Credits

Huge thanks to @lukesandberg, @mischnic, @roottool, @timneutkens, @ijjk, and @devjiwonchoi for helping!