如何在打字稿中获取字符串枚举的键

Question

我想从字符串枚举中获取密钥作为字符串。

enum myEnum {
   myFoo = "My Foo",
   myBar = "My Bar",
}

然后我需要从'myFoo'获得myEnum.myFoo

我已经解决了这个问题，但似乎可以更简单

function getKeyOfMyEnum(myVal: string): string {
    for (var enm in myEnum) {
        if (isValid(enm) && myEnum[enm] === myVal)
            return enm;
    }
    return ''  //I need the type not to be undefined

    function isValid(value: string): value is keyof typeof myEnum {
        return value in myEnum;
    }
}

然后

string str = getKeyOfMyEnum(myEnum.myFoo )   //str ==='myFoo'