Turbopack: How Incremental Computation Accelerates Development Workflows
By
feross
Fresh out the oven, still warm. Top of the tray.
Summary
Turbopack is a modern bundler that uses incremental computation and caching to dramatically speed up development workflows. Unlike traditional bundlers that rebuild everything on each change, Turbopack only rebuilds what's necessary, making edit-save-refresh cycles much faster. The article explains the technical challenges of implementing incremental computation (complexity, bug potential, cache overhead) and why the team pursued this approach despite the difficulties. It focuses on how Turbopack scales for large Next.js applications by building only what changes rather than rebuilding everything.
Key quotes
· 4 pulledEdit. Save. Refresh. Wait… Wait… Wait… Compiling code usually means waiting, but Turbopack makes iteration loops fast with caching and incremental computation.
Not every modern bundler uses an incremental approach, and that's with good reason. Incremental computation can introduce significant complexity and opportunities for bugs.
Caches require extra tracking and copies of data, adding both CPU and memory overhead. When applied poorly, caching can actually make performance worse.
Despite all of this, we took on these challenges because we knew that an incremental architecture would be critical.
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