typescript - 在 Typescript 中使用 SinonJS 时，私有(private)属性被报告为缺失

Question

我正在尝试使用 sinon.createStubInstance stub 类实例但我收到一条错误消息，指出缺少私有(private)成员变量。当然，我也不能明确设置它，因为它是私有(private)成员。

示例类:

class Foo {
  private readonly bar: string;

  constructor(bar: string) {
    this.bar = bar;
  }
}

class Parent {
  foos: Foo[];

  constructor(foos: Foo[]) {
    this.foos = foos;
  }
}

在测试中，我正在写 beforeEach堵塞:

beforeEach(function () {
  const stubFoo = sinon.createStubInstance(Foo);

  const stubParent = sinon.createStubInstance(Parent);
  stubParent.foos = [stubFoo]; // Tslint error here
});

Tslint 错误是:

Property 'bar' is missing in type 'SinonStubbedInstance' but required in type 'Foo'

作为记录，我使用的是 Typescript v3.0.3 和 Sinon v7.4.1。

Answer 1

我个人喜欢this solution由 Github 用户 (paulius-valiunas) 发现:

if you just want to use this in a couple places, a simpler and more readable solution would be to use the type alias StubbedClass<T> = SinonStubbedInstance<T> & T directly. For example:

export type StubbedClass<T> = SinonStubbedInstance<T> & T;
const myStub = sinon.createStubInstance(MyClass) as StubbedClass<MyClass>;

or just:

const myStub = sinon.createStubInstance(MyClass) as SinonStubbedInstance<MyClass> & MyClass;

比其他建议更清洁、更简单!