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!