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ReadonlyDeep type

Like Readonly but recursive

Signature:

export declare type ReadonlyDeep<T> = T extends Builtin
  ? T
  : T extends Map<infer K, infer V>
  ? ReadonlyMap<ReadonlyDeep<K>, ReadonlyDeep<V>>
  : T extends ReadonlyMap<infer K, infer V>
  ? ReadonlyMap<ReadonlyDeep<K>, ReadonlyDeep<V>>
  : T extends WeakMap<infer K, infer V>
  ? WeakMap<ReadonlyDeep<K>, ReadonlyDeep<V>>
  : T extends Set<infer U>
  ? ReadonlySet<ReadonlyDeep<U>>
  : T extends ReadonlySet<infer U>
  ? ReadonlySet<ReadonlyDeep<U>>
  : T extends WeakSet<infer U>
  ? WeakSet<ReadonlyDeep<U>>
  : T extends Promise<infer U>
  ? Promise<ReadonlyDeep<U>>
  : T extends {}
  ? {
      readonly [K in keyof T]: ReadonlyDeep<T[K]>;
    }
  : Readonly<T>;

References: ReadonlyDeep

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