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<!--info-header-start--><h1>获取只读属性 </h1><blockquote><p>by Anthony Fu <a href="https://github.com/antfu" target="_blank">@antfu</a></p></blockquote><p><a href="https://tsch.js.org/5/play/zh-CN" target="_blank"></a> &nbsp;&nbsp;&nbsp;<a href="./README.md" target="_blank"></a> <a href="./README.ja.md" target="_blank"></a> <a href="./README.ko.md" target="_blank"></a> <a href="./README.pt-BR.md" target="_blank"></a> </p><!--info-header-end-->

实现泛型GetReadonlyKeys<T>，GetReadonlyKeys<T>返回由对象 T 所有只读属性的键组成的联合类型。

例如

ts
interface Todo {
  readonly title: string
  readonly description: string
  completed: boolean
}

type Keys = GetReadonlyKeys<Todo> // expected to be "title" | "description"
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