Typescript definitely helped on all the projects I've used it. The main con is that sometimes things are not very clear and you might end up spending time on s

Typescript definitely helped on all the projects I've used it. The main con is that sometimes things are not very clear and you might end up spending time on something that typescript can't handle (eg a function that can return several types of objects, I had to put the return type of the function to any to have it compiled). The pros: - being able to refactor stuff easily with the compiler telling you - catch typos easily (I remember watching Dan Abramov video at react europe and some of the errors he showed would be a compilation error in TS) - if you maintain all your classes/object definitions in one file (except maybe stuff like state of a React component which doesn't need to be shared), you have all your types at one place and anyone can come in and have a clear view of the project: I had someone come help me on a previous project and it took him basically no time to get a grip on the project structure/models - DefinitelyTyped so you can also type your calls to third party libraries and what they return Make sure to only use ES6 imports (no internal modules) and it's pretty close to babel but with types.