I've been thinking about going the other direction: creating an ESLint preset that enforces immutable patterns instead. Might be a nice lightweight alternative, but I haven't built it yet - for now, we just encourage these patterns in our internal style guide.

This is super cool! I honestly never thought about overriding the built-ins like that. It’s a powerful approach, though it might feel a bit "too much" for some teams, and polishing the last missing bits for seamless production use might be tricky. Still, love the idea.

Thanks for the shout-out! Really appreciate it.

Yeah, using string literals as types is pretty powerful