It does have built in type definitions for React, where as all other libraries you probably need to use flow-typed (similar to definitely-typed in TypeScript).

It does have built in type definitions for React, where as all other libraries you probably need to use flow-typed (similar to definitely-typed in TypeScript). So it does kind of have React integration, but it's pretty loose - you can use it with any other framework, and there's nothing obviously React-specific about the language. Edit: See https://flow.org/en/docs/react/types/ https://flow.org/en/docs/react/types/