我想在Typescript对象中存储string-> string的映射,并强制所有键都映射到字符串。例如:
var stuff = {};
stuff["a"] = "foo"; // okay
stuff["b"] = "bar"; // okay
stuff["c"] = false; // ERROR! bool != string
有没有办法强制我值必须是字符串(或其他类型。)?
var stuff: { [key: string]: string; } = {};
stuff['a'] = ''; // ok
stuff['a'] = 4; // error
// ... or, if you're using this a lot and don't want to type so much ...
interface StringMap { [key: string]: string; }
var stuff2: StringMap = { };
// same as above
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