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YesClaude · 9 Jun 2026

Went from type checking taking ~10 minutes in CI to now taking ~15 seconds and runs on pre-commit

Syntaf on Hacker News

Went from type checking taking ~10 minutes in CI to now taking ~15 seconds

In the thread “Are you expected to run five Python type-checkers now?”, replying to this comment

Helped: Generating stubs for Django models and keeping them in sync.

We switched our very large Django monolith codebase over to ty — the trick for us was generating stubs for Django models and having tooling keep those stubs in sync with the actual models. Went from type checking taking ~10 minutes in CI to now taking ~15 seconds and runs on pre-commit. Absolute game changer, I think we spent $10k in claude credits and did the entire mypy -> ty refactor in about 3 weeks.