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I like that typescript catches when I need to do null checks so I don't end up with the most notorious runtime error seared into the brain of every JS developer "cannot read property of undefined".

Some parts are nice, like the string literal typing "this" | "that". Other things are hacky, like "branded types", gross.

But then I think of my commercial codebase which is extremely well tested, regular old JS, and wonder if is worth the hassle.