Introduction to ReasonML
summary
ReasonML presents OCaml syntax reworked for JavaScript ergonomics and claims 100% type coverage with a sound type system that eliminates runtime type errors; BuckleScript compiles Reason to compiles to readable JavaScript and interoperates with existing JS and React code. Real-world numbers include 50% of Messenger codebase migrated to Reason in production. A single codebase example, Gravitron, deploys to iOS Android and web, showing cross‑platform native and JS targets actually work.
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