如何使用枚舉（附加到 class 作為 static 變量）作為類型

Question

 // file1.ts enum Variant { Success = 'success', Error = 'error', } export class Example { static Variant = Variant; } // file2.ts import { Example } from './file1'; type Props = { variant: Example.Variant; // TS2702: 'Example' only refers to a type, but is being used as a namespace here. };

Typescript 拋出錯誤： TS2702: 'Example' only refers to a type, but is being used as a namespace here.

我知道我可以導出枚舉本身並在file2.ts中使用它，但我想知道為什么上面的示例不起作用。

Answer 1

變體是static class 字段

 export class Example { // Variant here is a class field static Variant = Variant; }

所以如果你想通過class Example使用 Variant 作為type ，你應該在Example.Variant之前添加typeof

 import { Example } from './file1'; type Props = { // This statement means that Example is a namespace that contains Variant as a type or class named Variant, which in our case it is a field variant: Example.Variant; // wrong variant: typeof Example.Variant; // correct };

所以出現錯誤是因為您使用class作為namespace