I'm currently refreshing my TypeScript knowledge and learning how to comprehensively apply it to React, so you all get to learn along with me! Toda...
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I haven't used Typescript, but if I were to ever use it, it would be for one other HUGE advantage--the fact that it transpiles down to ES5 Javascript for you. Kind of an alternative to running Babel, from what I understand.
This is a very good point! Babel is definitely one of the major dependencies of TypeScript!