Type Alias DeepReadonly<T>

DeepReadonly: T extends (infer U)[]
? ReadonlyArray<DeepReadonly<U>>
: T extends object ? { readonly [K in keyof T]: DeepReadonly<T[K]> } : T

Makes all nested properties readonly recursively

递归地将所有嵌套属性设为只读

Type Parameters

T

Example

interface Person {
  name: string
  address: { city: string }
}
type ReadonlyPerson = DeepReadonly<Person>
// { readonly name: string; readonly address: { readonly city: string } }