Question

具有以下代码：

// file1.ts
interface X { ... } // Don't want to directly export this (private/internal)

// Assume LibInterface<T> is some random interface from an external library
export const func: (arg: LibInterface<X> => string) = ...;


// file2.ts (essentially the jest test file)
import { func } from './file1';

const x: X = ...;
const arg: LibInterface<X> = ...;

expect(func(arg)).toEqual(...);

在上面，我如何在第二个文件中引用类型X？

使用类型X和jest-mock-extended的复杂用例：const mockX = mock<X>(...);

我已经搜索过此内容，也浏览了https://www.typescriptlang.org/docs/handbook/utility-types.htmlhttps://www.typescriptlang.org/docs/handbook/utility-types.html，但找到了解决方法。

Answer 1

您可以向该函数添加泛型吗？会是这样的：

// file1.ts
interface X { ... } // Don't want to directly export this (private/internal)

// Assume LibInterface<T> is some random interface from an external library
export const func: <T extends X = X>(arg: LibInterface<T> => string) = ...;


// file2.ts (essentially the jest test file)
import { func } from './file1';

const x: X = ...;
const arg: LibInterface<X> = ...;

expect(func(arg)).toEqual(...);

打字稿：来自值的引用通用类型，用作其他地方的类型

1 个答案: