January 12, 2026

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Welcome to Next.js Daily for January 13th, 2026.

Twenty pull requests merged yesterday, led by significant improvements to server actions and build optimization.

Zack Tanner merged a fix for server action requests to use Resume Data Cache. This resolves an issue where cached data wasn't provided to server action handlers during page re-renders, preventing temporary data inconsistencies between server actions and ISR shells.

Luke Sandberg merged Turbopack's transitive side effects computation for import trimming. The system now analyzes modules and their dependencies to drop unnecessary ModuleEvaluation imports when no side effects are detected. Testing on Vercel's site increased trimmed modules from 1,802 to 2,165, though with a small performance cost.

Benjamin Woodruff merged Turbopack's reqwest update, removing the experimental system TLS feature. The new version uses rustls-platform-verifier by default, eliminating custom PKI root dependencies while maintaining corporate firewall compatibility.

Brooke Mosby merged and then reverted automatic deployment ID generation for prebuilt skew protection. The feature was rolled back after initial deployment.

Andrew Imm merged and reverted DirList module separation for Turbopack's require.context functionality. The change was backed out to address integration issues.

Additional merges included TypeScript noUncheckedSideEffectImports support for CSS imports, memory optimizations in turbo-tasks-backend, and various documentation updates to the AGENTS.md file for AI contributors.

What's next: Turbopack performance optimizations continue with refined side effect analysis. Server action caching improvements move toward production deployment.

That's Next.js Daily. Stay updated at nextjs.org.