v15.6.0-canary.32

Core Changes

• Move config.turbopack.moduleIds to config.experimental.turbopackModuleIds: #84230
• Show invalid default export errors during prerendering: #84242
• fix: make sure caller exists in babel preset: #84154
• [mcp] allow to enable mcp server through env var: #84278
• fix(metadata): make formatDetection respect true/false properly: #83924
• Upgrade React from b0c1dc01-20250925 to df38ac9a-20250926: #84276
• Add a --webpack flag and default --turbopack to true: #84216
• fix: Update URL resolution logic to handle search parameters on root path /?foo=bar: #78262
• [Breaking] Remove deprecated sync access to Dynamic APIs: #84179

Misc Changes

• Turbopack: Scope with work queue: #84225
• [test] Make Undefined default export an e2e test suite: #84240
• [turbopack] Conditionally create pages router data endpoints.: #84194
• Turbopack: parallel connect children: #84173
• Turbopack: count turbo_tasks::run as foreground tasks to avoid being idle: #84245
• Turbopack: make persistent caching log line more clear: #84262
• Turbopack: make tracing nicer: #84263
• docs:Small improvement on the contribution guide for clarity: #84200
• Turbopack: Remove not-very-useful "Finished writing to disk in" log line: #84244
• Turbopack: follow up changes from parallel children: #84219
• [turbopack] Simplify take_issues and peek issues: #84199
• Update Rspack development test manifest: #84260
• Update Rspack production test manifest: #84259

Credits

Huge thanks to @devjiwonchoi, @sokra, @unstubbable, @lukesandberg, @FelipeChicaiza, @bgw, @kevva, @huozhi, @m1abdullahh, @vercel-release-bot, and @F7b5 for helping!

v15.6.0-canary.31

Core Changes

• Feat: get_page_metadata MCP endpoint: #84211
• feat: capture logs into logging file during development: #84183
• babel-loader: Avoid calling expensive isReactCompilerRequired check when we must run Babel anyways: #84103
• [mcp] expose logging: #84226

Misc Changes

• Turbopack: trace fs-extra calls: #84246
• [test] Overhaul Undefined default export test suite: #84235

Credits

Huge thanks to @mischnic, @gaojude, @huozhi, @unstubbable, and @bgw for helping!

v15.6.0-canary.30

Core Changes

• Add internal environment variable for enabling React Compiler: #84176
• [devtools] Disable React's default Transition indicator: #84202
• Upgrade React from e2332183-20250924 to b0c1dc01-20250925: #84248

Example Changes

• docs: update Dockerfile to use node:lts-alpine instead of node:18-alpine: #84229

Misc Changes

• Turbopack: increase retry duration, reduce busy looping when there is other work: #84171
• Turbopack: Try to avoid block_in_place in scope: #84172
• [turbopack] Remove some bitmap clones: #84193
• Turbopack: lazier manifests, part deux: #84191
• Turbopack: avoid panic on updating output when a task was cancelled: #84214
• docs: nav_title for long unbroken words: #84233
• Turbopack: Use RawValue for mappings inside SourceMapJson: #84208
• Update Rspack development test manifest: #84218
• Turbopack: fix NFT of readFileSync of relative path: #84155
• Turbopack: improve references benchmark: #84223
• Update Rspack production test manifest: #84217
• Turbopack: drop ASTs when only tracing: #84185
• docs: Include more detailed instructions on excluding from common AV solutions, including macOS Gatekeeper: #84206

Credits

Huge thanks to @sokra, @lukesandberg, @eps1lon, @mischnic, @Samii2383, @icyJoseph, @bgw, and @vercel-release-bot for helping!

v15.6.0-canary.29

Core Changes

• Feat: get_errors MCP endpoint: #84161

Misc Changes

• Revert "[turbopack] Set liveness of exports based on assignment ana…: #84207

Credits

Huge thanks to @gaojude and @ztanner for helping!

v15.6.0-canary.28

Core Changes

• refactor: separate forward browser logs utils: #84151
• Upgrade React from 1eca9a27-20250922 to e2332183-20250924: #84189
• [Cache Components] default to filtering unhandledRejection after abort: #84192
• fix: prevent URL mutation in router rewrites: #83963
• fix(server): fix pages router resume router matching: #84158

Misc Changes

• script: improve release log generation: #83686
• Turbopack: split task_execution_completed into multiple methods: #84170
• Turbopack: only generate field if spans are enabled: #84184
• Turbopack: support more dynamic request with import map: #84178
• [turbopack] defer a value_to_string operation until we need it: #84188
• Update Rspack production test manifest: #84165

Credits

Huge thanks to @huozhi, @sokra, @mischnic, @gnoff, @lukesandberg, @wyattjoh, and @vercel-release-bot for helping!

v15.6.0-canary.27

Core Changes

• Fix double comma in build manifest: #84131
• [turbopack] set app dir only to true when no pages entries detected: #84144
• Split code-frame into separate compiled package: #84174

Credits

Huge thanks to @timneutkens and @huozhi for helping!

v15.6.0-canary.26

Core Changes

• docs: update Security section to direct disclosures : #84156
• ci: Enable experimental.isolatedDevBuild for test-experimental-dev: #84099
• [turbopack] Ensure React Compiler options are based dev vs prod: #84062
• Enable anonymous function naming in React Compiler: #84070
• Revert "[Breaking] Remove deprecated publicRuntimeConfig and serverRuntimeConfig (#83944)": #84167

Misc Changes

• Update Rspack development test manifest: #84117

Credits

Huge thanks to @aaronbrown-vercel, @vercel-release-bot, @devjiwonchoi, and @eps1lon for helping!

v15.6.0-canary.25

Core Changes

• Flag excess properties in Next.js config with TypeScript: #84069

Misc Changes

• Turbopack: add more details to the graph panic: #84143
• test: split app-middleware test per describe: #84130

Credits

Huge thanks to @sokra, @eps1lon, and @devjiwonchoi for helping!

v15.6.0-canary.24

Core Changes

• BREAKING CHANGE!: bump default images.minimumCacheTTL from 1 min to 4 hours: #84105
• Feat: Add Model Context Protocol (MCP) server to Next.js dev server: #84100
• Upgrade React from d415fd3e-20250919 to 1eca9a27-20250922: #84093
• Turbopack: Remove the deprecated .turbo config object: #84109

Misc Changes

• docs: onRequestError request header type: #83988
• Turbopack: Improve persistent caching test case: #83205
• Turbopack: add more details to the graph panic: #84126
• docs: Cookies store access is async: #83987
• Bump Rust to nightly-2025-09-21: #83415
• Upgrade CodSpeed action and add analyzer benchmarks: #84135
• Turbopack: fix run_once when returning error: #84142
• [turbopack] Conditionally collect affecting sources: #83921
• Turbopack: slightly improve resolve_source_map_sources: #84147
• Turbopack: RawEcmascriptModule: #81806

Credits

Huge thanks to @icyJoseph, @sokra, @styfle, @gaojude, @mischnic, @lukesandberg, and @bgw for helping!

v15.6.0-canary.23

Core Changes

• Development: Only load webpack when used: #84123
• Turbopack: Skip loading webpack plugin: #84125
• Development: Only load createEnvDefinitions when used: #83935

Credits

Huge thanks to @timneutkens for helping!