@uifabric/utilities/lib-commonjs/dom/getWindow.js

Fluent UI React utilities for building components.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var setSSR_1 = require("./setSSR");
var _window = undefined;
// Note: Accessing "window" in IE11 is somewhat expensive, and calling "typeof window"
// hits a memory leak, whereas aliasing it and calling "typeof _window" does not.
// Caching the window value at the file scope lets us minimize the impact.
try {
    _window = window;
}
catch (e) {
    /* no-op */
}
/**
 * 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
 */
function getWindow(rootElement) {
    if (setSSR_1._isSSR || typeof _window === 'undefined') {
        return undefined;
    }
    else {
        var el = rootElement;
        return el && el.ownerDocument && el.ownerDocument.defaultView ? el.ownerDocument.defaultView : _window;
    }
}
exports.getWindow = getWindow;
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