Open-sourcing Sorbet: a fast, powerful type checker for Ruby

We designed Sorbet to be used at Stripe, where the vast majority of our code is written in Ruby. We’ve spent the last year and a half developing and adopting Sorbet internally, and we’re finally confident that Sorbet is not just an experimental, internal project—we’re ready to share Sorbet with the entire Ruby community. Stripe is committed to growing the Sorbet project as a robust part of the Ruby ecosystem.

Source: sorbet.org