7. Readonly

实现 Readonly<T> 类型，将 T 的所有属性设置为只读的，这意味着无法重新分配所构造类型的属性。

::: playground#ts 7. Readonly

@file index.ts

// ============= Test Cases =============
import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<MyReadonly<Todo1>, Readonly<Todo1>>>,
]

interface Todo1 {
  title: string
  description: string
  completed: boolean
  meta: {
    author: string
  }
}

// ============= Your Code Here =============
type MyReadonly<T> = any

:::

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type MyReadonly<T> = {
  readonly [K in keyof T]: T[K]
}