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VS Code Blog·Jun 26·5 min read
Iterating faster with TypeScript 7
TL;DR
VS Code faced challenges with build speed and type checking inconsistencies in TypeScript. The team adopted TypeScript 7, a complete rewrite of the TypeScript compiler in Go, incrementally integrating it into their workflows.
✦ Why It Matters
Engineers can leverage incremental adoption strategies to improve performance and stability in their projects.
Key Takeaways
- Adopt TypeScript 7 incrementally to reduce risk.
- Utilize TypeScript 7's performance improvements for faster builds.
- Provide early feedback to improve tooling and features.
- Simplify build processes by using esbuild with TypeScript 7.
Full Summary
TypeScript 7 represents a major overhaul of the TypeScript compiler, now built in Go, which enhances performance and reduces build times. The VS Code team adopted TypeScript 7 incrementally, starting with low-risk areas to minimize disruptions while providing early feedback to the TypeScript team.
This collaborative approach allowed them to identify bugs and improve the language tooling. As a result, type checking for the main VS Code source code dropped from 36 seconds to just 5 seconds, and overall build times decreased from 80 seconds to around 20 seconds.
The successful migration not only improved developer productivity but also contributed to a more polished TypeScript 7 release. This case exemplifies the benefits of incremental adoption and close collaboration in software development.