[mot0rola]

Yes, the props and state are defined by interfaces so if you try to pass in a prop object which does not meet definition of the interface, typescript will complain. I think typescript is not so bad of an option until native ES6 support becomes more mainstream.

[chenglou]

Btw, flow (http://flowtype.org) already comes with React propTypes integration. When you write `x: React.PropTypes.number.isRequired`, it knows how to correctly translate that to static types.

[mot0rola]

flow looks cool. I just have not had time yet to give it a chance. I use typescript a lot at work and I really am digging react on the side so that is why i chose to do this. typescript is nice in that it gives you type checking plus classes, modules, lambdas etc today. I am looking forward to class support for react components (0.13?)

[pspeter3]

Agreed. I think the TypeScript integration will actually get easier when React supports native ES6 classes.