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app/src/vendor/muuri-src/utils/getScrollableAncestors.js

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+/**
+ * Copyright (c) 2015-present, Haltu Oy
+ * Released under the MIT license
+ * https://github.com/haltu/muuri/blob/master/LICENSE.md
+ */
+
+import isScrollable from './isScrollable';
+
+/**
+ * Collect element's ancestors that are potentially scrollable elements. The
+ * provided element is also also included in the check, meaning that if it is
+ * scrollable it is added to the result array.
+ *
+ * @param {HTMLElement} element
+ * @param {Array} [result]
+ * @returns {Array}
+ */
+export default function getScrollableAncestors(element, result) {
+  result = result || [];
+
+  // Find scroll parents.
+  while (element && element !== document) {
+    // If element is inside ShadowDOM let's get it's host node from the real
+    // DOM and continue looping.
+    if (element.getRootNode && element instanceof DocumentFragment) {
+      element = element.getRootNode().host;
+      continue;
+    }
+
+    // If element is scrollable let's add it to the scrollable list.
+    if (isScrollable(element)) {
+      result.push(element);
+    }
+
+    element = element.parentNode;
+  }
+
+  // Always add window to the results.
+  result.push(window);
+
+  return result;
+}