问题

以下是您要翻译的内容：

I would like to reset a class assigned to a const after every test.

In main.ts I have a class and assign it to a const:

我想在每次测试后重置分配给常量的类。

在 main.ts 中，我有一个类并将其分配给一个常量：

class MyClass {
// many properties and methods inside here
}

const myClass = new MyClass()

Now I would like to reset this to a fresh class after every test I run. This will be done with the built-in function `afterEach()` from jest. I tried to just assign it like this:
现在，我希望在运行每次测试后将其重置为一个新的类。这将使用 jest 的内置函数 `afterEach()` 来完成。我尝试像这样分配它：

main.myClass = new MyClass()

but TypeScript is complaining `Cannot assign to 'myClass' because it is a read-only property.`
但是 TypeScript 报错说“无法分配给 'myClass'，因为它是一个只读属性。”

What is the proper way to do this?
有什么正确的方法可以做到这一点？

<details>
<summary>英文:</summary>

I would like to reset a class assigned to a const after every test.




In main.ts I have a class and assign it to a const:

class MyClass {
// many properties and methods inside here
}

const myClass = new MyClass()

Now I would like to reset this to a fresh class after every test I run. This will be done with the built in function afterEach() from jest. I tried to just assign it like this:

main.myClass = new MyClass()

but typescript is complaining `Cannot assign to 'myClass' because it is a read-only property.`

What is the proper way to do this?

</details>


# 答案1
**得分**: 1

因为你的代码中使用了 'const' 关键字：

```javascript
const myClass = new MyClass()

你可以将它重写为（在 TypeScript 中）：

let myClass: myClass = new MyClass();

然后，当你想要重置它时，只需执行：

myClass = new MyClass();

const myClass = new MyClass()

let myClass : myClass = new MyClass();

myClass = new MyClass();