typescript :防止意外使用对象[索引]

Question

我惊讶地发现 typescript 可以使用以下代码:

interface IFoo {
  bar: string;
}

const foo: IFoo = {bar: 'bar'};

console.log(
  foo['anything'] // I'd like typescript to prevent this
);

有没有办法在不期望的情况下阻止使用 [] 访问器？

Answer 1

Is there a way to prevent usage of [] accessor when not expected?

如果你想抛出一个错误，你可以启用 noImplicitAny flag ，这将导致以下错误:

Element implicitly has an any type because type IFoo has no index signature.