第一种：
(window as any).aaa
第二种：
declare global { interface Window { aaa: any; } } window.aaa = window.aaa || {};
第三种：
interface MyWindow extends Window {
aaa(): void;
}
declare var window: MyWindow;
[ts] Property 'aaa' does not exist on type 'Window' 解决办法
原文：https://www.cnblogs.com/ldld/p/10270663.html