Turbopack

Turbopack is an incremental bundler for JavaScript and TypeScript written in Rust by the creators of Webpack and Next.js at Vercel. It is designed to replace Webpack as the default bundler in Next.js, offering dramatically faster build times by leveraging Rust's performance and an architecture built around incremental computation from the ground up.

The key innovation is that Turbopack tracks dependencies at a granular level and only recomputes what has actually changed, rather than rebuilding entire module graphs. This makes hot module replacement nearly instant even in large applications with thousands of modules. For web developers working on Next.js projects, Turbopack reduces the feedback loop during development from seconds to milliseconds as projects grow. While still maturing compared to Webpack's extensive plugin ecosystem, Turbopack represents the direction modern JavaScript bundling is heading toward.