G1Joshi Turbopack
Turbopack is the build engine built by Vercel. In 2025, it is Stable in Next.js and powers the fastest dev server in the ecosystem.
When to Use
- Next.js: It's the default dev engine (
next dev --turbo). - Scale: Designed for monorepos with thousands of pages.
Core Concepts
Incremental Computation
Turbopack never does the same work twice. It caches function results at a granular level (the "Function Level Caching").
Lazy Bundling
It only bundles the dynamic imports and pages you actually visit.
Request Level Compilation
Compiles code only when a request hits the server.
Best Practices (2025)
Do:
- Use
--turbo: Enable it in Next.js for instant HMR. - Trust the Cache: Turbopack handles invalidation correctly.
Don't:
- Don't configure it manually: In 2025, it's mostly configured via framework adapters (Next.js).