[rglover]

They are, but in practice there's little difference in the ends because you're getting the same feedback (did I pass the right type, yes or no). Like calling someone on a cell phone vs. a land line.

If the type of data you're passing around is erratic beyond development (where, just like TypeScript, a function-based approach illuminates incorrect data being passed around), you're writing bad code and TypeScript is nothing more than a crutch.

I expect most hardline TypeScript people to disagree, but type errors are the least of my concerns thanks to the above approach. It's not just an opinion; it's based on experience/evidence [1].

[1] https://github.com/cheatcode/joystick