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Evan Hahn @evanhahn.com · 18/11/2025

Any TypeScript experts know how to make the language immutable by default? I got it working for Array and Record, but not plain objects... evanhahn.com/typescript-i...

evanhahn.com

Experiment: making TypeScript immutable-by-default

I got it working with arrays and records, but couldn't make it work for regular objects.

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Marek Honzal @marekhonzal.com · 19/11/2025

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.

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Marek Honzal @marekhonzal.com · 19/11/2025

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.

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