[jbrantly]

You don't actually have to use the transpiler features of TypeScript if you set `--target` appropriately. And Flow has the same problems regarding language features. Flow doesn't just magically understand all JS features now and forever. When new stuff comes out it has to be added to Flow, same with TypeScript.

Edit: To be clear though, I agree with you about the TS transpiler. I think TypeScript's strength is in its static type checking, not in its transpiling.