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Discussion on: Kotlin: How Can a Programming Language be so Young And so Mature at The Same Time?

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André Michel Andy

Well, I don't know if some codebases would have problem with Kotlin, I'm talking about Java 5 or older code. In those cases, some refractory will be needed.

I've read something about it, it is necessary a gradual migration from JS code to TS code. It is not obligatory but it's needed if developers want to use types.

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Alex Fedorov

Of course, such old code will need to be upgraded to recent version of Java anyways.

I did recently a migration from JS to TS, and it is still quite painful. You have to hunt a lot of TS config options to make them just right so that JS + TS can work together and not get into any 'import' errors.