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node_modules/@fluentui/utilities/lib-amd/dom/getWindow.d.ts

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+/**
+ * Helper to get the window object. The helper will make sure to use a cached variable
+ * of "window", to avoid overhead and memory leaks in IE11. Note that in popup scenarios the
+ * window object won't match the "global" window object, and for these scenarios, you should
+ * pass in an element hosted within the popup.
+ *
+ * @public
+ */
+export declare function getWindow(rootElement?: Element | null): Window | undefined;