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You can get pretty far with a statically typed, purely functional language. For example, Elm's package manager enforces semantic versioning: https://elm-lang.org/

I don't think you can do that with JavaScript.

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You can always break an API with the values, however much you do with the types.

Its effectiveness also varies with how much and well types are used - e.g. whether you return `String` or `Url` to begin with.

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