I find that the cost of TypeScript's compiler more than pays for itself with all the other benefits it offers. It's to the point that I can't imagine working in

I find that the cost of TypeScript's compiler more than pays for itself with all the other benefits it offers. It's to the point that I can't imagine working in JavaScript without it and I'm less happy working in other dynamic languages when I'm forced to. Refresh and rerun is great when you're developing but offers you nothing when you come back to the code weeks or months later. A good type system has your back even after you've forgotten how everything fits together.