TypeScript · Junior · Question 59 of 75

What does `Readonly<User>` do?

✓Correct answer: Makes every property of User read-only (shallowly)
2Freezes the object at runtime
3Makes the properties optional

Explanation

Nested objects remain mutable. At runtime nothing changes; use Object.freeze if you need runtime protection.

Further reading

TS: Utility Types ↗

Test yourself

Take the TypeScript · Junior quiz: questions and options are shuffled, and you get a review of your mistakes at the end.