Typescript 实现类似字典的类

难道这不可能吗

interface IDictionary {
    [index: string]: string;
}

class Dictionary implements IDictionary {
    public foo = "bar";
}

相反，我得到了一个错误：

TS2420:Class 'Dictionary' incorrectly implements 'IDictionary'. Index signature is missing in type 'Dictionary'.

---

因为你实现了一个接口

interface IDictionary {
    [index: string]: string;
}

class Dictionary implements IDictionary {
    public foo = "bar";
}

你需要提供所有的要求

interface IDictionary {
    [index: string]: string;
}

class Dictionary implements IDictionary {
    public foo = "bar";
    [index: string]: string;
}