Core Changes
- Move
config.turbopack.moduleIdstoconfig.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
b0c1dc01-20250925todf38ac9a-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 exportan 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!