const createFruit = <T extends string[]>(fruits: T): typeof fruits[0] => fruits[0]

const fruit = createFruit(['apple', 'orange']) // fruit is of type `string`

我希望将 fruit 的类型推断为字符串文字 apple。有没有办法做到这一点？

最佳答案

使用 variadic tuple fruits 参数的语法将提示编译器推断文字类型。

const createFruit = <T extends string[]>(
  fruits: [...T]
): typeof fruits[0] => fruits[0]

const fruit = createFruit(['apple', 'orange'])
//    ^? fruit: "apple"

Playground

https://stackoverflow.com/questions/74940877/