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Would it be possible to have a single method on a class that behaves like whatever useEffect is doing?

Not in a single method, no. Watch this talk for more details! https://www.youtube.com/watch?v=wXLf18DsV-I

Well, I did something a bit similar my own language: https://github.com/batiste/blop-language/commit/90e7704e125f... Not sure where classes are an issue with doing anything like this