typescript - 覆盖 lib.d.ts 中定义的变量

Question

我在下面输入了 WebWorkers API。在文件的最底部是描述自身对象的一行。 lib.d.ts 中使用了相同的变量名称，当我添加对 WebWorker.d.ts 的引用时，我看到 self 的类型为 Window，而不是 DedicatedWorkerGlobalScope。我应该修复什么来覆盖这个定义？

interface WorkerNavigator extends NavigatorID, NavigatorOnLine {
}

interface WorkerUtils extends WindowTimers, WindowBase64 {
    importScripts: (...urls: string[]) => void;
    navigator: WorkerNavigator;
}

interface WorkerLocation {
    href: string;
    protocol: string;
    host: string;
    hostname: string;
    port: string;
    pathname: string;
    search: string;
    hash: string;
}

interface WorkerGlobalScope extends EventTarget, WorkerUtils {
    self: WorkerGlobalScope;
    location: WorkerLocation;

    close: () => void;
    onerror: Function;
    onoffline: Function;
    ononline: Function;
}

interface DedicatedWorkerGlobalScope extends WorkerGlobalScope {
    postMessage:(message:any, ...args:any[])=>void;
    onmessage: Function;
}

declare var self: DedicatedWorkerGlobalScope;

更新:尽管有上面的代码，但我必须使用以下方式。看起来 self 的定义没有被覆盖

/// <reference name="WebWorkers.d.ts" />

declare var self: DedicatedWorkerGlobalScope;

Answer 1

该代码是有效的，您可以看到它适用于最新版本的 TypeScript here

TypeScript 接口(interface)是开放式的:

interface Foo{
    bar:number;
}

// Continue to add members to Foo: 
interface Foo{
    baz: number;
}

// The followin is valid : 
var foo:Foo;
foo.bar = 123; 
foo.baz = 456;