Generics · hard

45. Deep Readonly

Recursively making all properties readonly.

Define `DeepReadonly<T>` using recursion.

Required in your answer: readonlyT[K] extends object

Transpiled, then run in a sandbox

type DeepReadonly<T> = { readonly [K in keyof T]: T[K] extends object ? DeepReadonly<T[K]> : T[K] };

Output appears here.