I took over the maintenance of bs-react-native - type-safe React Native bindings for ReasonML - and grew it for years. That meant hand-mapping the entire React Native API and its ecosystem (navigation, paper, svg, async-storage…) into strongly-typed bindings.

It also meant following the language's renames through bs-→ reason- → rescript-*, each with its own organisation to keep in sync - a large, meticulous binding effort across dozens of packages, until I moved on from ReScript.