DeepReadonly Type — vue Architecture

Source Code

src/v3/reactivity/readonly.ts lines 13–33

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