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azerum/DeepReadonly.ts

Created April 21, 2023 16:33
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DeepReadonly.ts
export type DeepReadonly<T> =
//Functions are objects, but don't need to be deep readonly
T extends Function ? T :
T extends Map<infer MK, infer MV> ? ReadonlyMap<DeepReadonly<MK>, DeepReadonly<MV>> :
T extends Set<infer E> ? ReadonlySet<DeepReadonly<E>> :
T extends Array<infer E> ? ReadonlyArray<DeepReadonly<E>> :
T extends object ? DeepReadonlyObject<T> :
T;
type DeepReadonlyObject<T> = {
readonly [K in keyof T]: DeepReadonly<T[K]>;
};
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