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Discussion on: Advanced TypeScript Exercises - Question 3

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Maciej Sikora Author

Yes, implementation of the value level can stay, but assertion like as X is a type level. Currently implementation cannot compile because of lack of proper typing, there is a way to solve it without any assertion that is why I left it as it is, so with compile error.

You can modify the implementation, the key is to have it working as original + typed safe.