Bonsai: Janestreet's UI Library

Bonsai is a UI library developed by Jane Street for building reactive web applications in OCaml, inspired by Elm and used for most of the company's internal web applications. Unlike traditional web frameworks that combine state, incrementality, and rendering into a single abstraction, Bonsai allows developers to compose these elements independently, with components implemented as purely functional state machines that only recompute values when necessary. The library's approach enables both efficient UI rendering and optimization of expensive business logic computations on live-updating datasets.