DeepReadonly type utility
📝 TypeScript
This TypeScript utility recursively makes all properties of an object type read-only, including nested objects and arrays.
TypeScript
type DeepReadonly<T> = T extends (infer U)[] ? ReadonlyArray<DeepReadonly<U>> : T extends object ? { readonly [K in keyof T]: DeepReadonly<T[K]> } : T;
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