小编Ser*_*oga的帖子

有人可以解释为什么这不会引发错误吗？

interface A {
    id?: number;
}
const a:A = {
    id: 5
};
const testA: boolean = (a === 1); //works, but why?


interface B {
    id: number;
}
const b:B = {
    id: 5
};
const testB: boolean = (b === 1); //compiler error -> expected that also on A

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