标题说明了一切-为什么Object.keys(x)在TypeScript 中不返回类型Array<keyof typeof x>？就是这样Object.keys做的，因此对于TypeScript定义文件作者来说，似乎很明显的疏忽是不将返回类型简单地设为keyof T。
我应该在他们的GitHub存储库上记录错误，还是继续发送PR为其进行修复？
Trying out TypeScript for a React project and I'm stuck on this error:
Element implicitly has an 'any' type because expression of type 'string' can't be used to index type '{ train_1: boolean; train_2: boolean; train_3: boolean; train_4: boolean; }'.
No index signature with a parameter of type 'string' was found on type '{ train_1: boolean; train_2: boolean; train_3: boolean; train_4: boolean; }'
Which appears when I try to filter the array in my component
.filter(({ name }) => plotOptions[name]); …