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In a complex codebase, it’s very helpful! It’s either TS or jsdoc. They are lifesavers sometimes.

Knowing what expects what and what you should expect in return. It helps you catch those minor bugs.

means you never had control over your code to begin with. adding complexity on top of complexity is not an answer

Well, sometimes you happen to be apart of ≈10 year old codebases with lots of people who've been working on it and is no longer there.

At that scale, TS is a godsend!