Typescript类型体操 - Mutable

题目

中文

实现一个通用的类型 Mutable<T>，使类型 T 的全部属性可变（非只读）。

例如：

interface Todo {
    readonly title: string;
    readonly description: string;
    readonly completed: boolean;
}
type MutableTodo = Mutable<Todo>; // { title: string; description: string; completed: boolean; }

English

Implement the generic Mutable<T> which makes all properties in T mutable (not readonly).

For example

interface Todo {
    readonly title: string;
    readonly description: string;
    readonly completed: boolean;
}
type MutableTodo = Mutable<Todo>; // { title: string; description: string; completed: boolean; }

答案

type Mutable<T extends object> = { -readonly [K in keyof T]: T[K] };

在线演示