> With Flow you don't even have to opt-in to a new syntax. You can just use comments: So you use a opt-in comment-based syntax instead of a opt-in non-comment

> With Flow you don't even have to opt-in to a new syntax. You can just use comments: So you use a opt-in comment-based syntax instead of a opt-in non-comment based one for type-annotations. Hardly a big difference. > Using really powerful inference you can also write much fewer types I'm just going to assume you didn't know typescript does this too. Typescript is nice. You should give it a try once. You may end up surprised:)