在 Typescript 中声明并初始化字典

给出以下代码

interface IPerson {
   firstName: string;
   lastName: string;
}

var persons: { [id: string]: IPerson; } = {
   "p1": { firstName: "F1", lastName: "L1" },
   "p2": { firstName: "F2" }
};

为什么初始化没有被拒绝？毕竟，第二个对象没有“lastName”属性。

Edit：此问题已在最新 TS 版本中得到修复。引用 @Simon_Weaver 对 OP 帖子的评论：

注意：此问题现已修复（不确定具体的 TS 版本）。我 正如你所期望的，在 VS 中得到这些错误：Index signatures are incompatible. Type '{ firstName: string; }' is not assignable to type 'IPerson'. Property 'lastName' is missing in type '{ firstName: string; }'.

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Apparently this doesn't work when passing the initial data at declaration. I guess this is a bug in TypeScript, so you should raise one at the project site.

您可以通过在声明和初始化中拆分示例来使用类型化字典，例如：

var persons: { [id: string] : IPerson; } = {};
persons["p1"] = { firstName: "F1", lastName: "L1" };
persons["p2"] = { firstName: "F2" }; // will result in an error