javascript – 字符串枚举的反向映射

我想在typescript中使用字符串枚举,但我看不到支持反向映射.
我有这样的枚举：

enum Mode {
    Silent = "Silent",
    normal = "normal",
    Deleted = "Deleted"
}

我需要像这样使用它：

let modeStr: string;
let mode: Mode = Mode[modeStr];

是的我不知道它在modeStr字符串中是什么,我需要将它解析为枚举,或者如果字符串未在枚举定义中显示则在运行时解析失败.
我怎么能尽可能整洁呢？
提前致谢

解决方法:

我们可以将Mode设置为同一类型的类型和值.

type Mode = string;
let Mode = {
    Silent: "Silent",
    normal: "normal",
    Deleted: "Deleted"
}

let modeStr: string = "Silent";
let mode: Mode;

mode = Mode[modeStr]; // Silent
mode = Mode.normal; // normal
mode = "Deleted"; // Deleted
mode = Mode["unkNown"]; // undefined
mode = "invalid"; // "invalid"

更严格的版本：

type Mode = "Silent" | "normal" | "Deleted";
const Mode = {
    get Silent(): Mode { return "Silent"; },
    get normal(): Mode { return "normal"; },
    get Deleted(): Mode { return "Deleted"; }
}

let modeStr: string = "Silent";
let mode: Mode;

mode = Mode[modeStr]; // Silent
mode = Mode.normal; // normal
mode = "Deleted"; // Deleted
mode = Mode["unkNown"]; // undefined
//mode = "invalid"; // Error

字符串枚举为this answer：

enum Mode {
    Silent = <any>"Silent",
    normal = <any>"normal",
    Deleted = <any>"Deleted"
}

let modeStr: string = "Silent";
let mode: Mode;

mode = Mode[modeStr]; // Silent
mode = Mode.normal; // normal
//mode = "Deleted"; // Error
mode = Mode["unkNown"]; // undefined