如何在Typescript中声明DOMMatrix和WebKitCSSMatrix？

How to decalare DOMMatrix and WebKitCSSMatrix in Typescript?

当我尝试访问Typescript(3.3.3)中的window.DOMMatrix或window.WebKitCSSMatrix时，出现错误：

Property 'DOMMatrix' does not exist on type 'Window'.

因此我尝试在窗口对象上声明它们，例如，

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interface MatrixWindow extends Window {
DOMMatrix?: DOMMatrix;
WebKitCSSMatrix?: DOMMatrix;
}
declare let window: MatrixWindow;

然后当我执行new window.DOMMatrix(transform)时，出现错误：

Cannot use 'new' with an expression whose type lacks a call or construct signature.

我想出了如何在实例化后将变量作为类输入为所需的类型。这有效：

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interface MatrixWindow extends Window {
DOMMatrix?: new (init: string | number[]) => DOMMatrix;
WebKitCSSMatrix?: new (init: string | number[]) => DOMMatrix;
}
declare let window: MatrixWindow;

(＃rubberducking)