runtime-typecheck

A babel plugin and library for converting flow types into runtime type assertions.

Goals:

• Fastish type assertions on the arguments and return types of all annoted functions
• Support for generics
• Support for calling code and providing generic information across module boundaries
• Fastish compilation
• Smart type assertions for things like Promises

Non-goals

• Any sort of static analysis
• Supporting the entire of the flow type system
• Supporting flow comments
• Support for node versions < 5