/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Returns the scrolling parent of the given element
 */
import { getStyleComputedProperty } from './getStyleComputedProperty';
import { getParentNode } from './getParentNode';
/**
 * @param {?} element
 * @return {?}
 */
export function getScrollParent(element) {
    // Return body, `getScroll` will take care to get the correct `scrollTop` from it
    if (!element) {
        return document.body;
    }
    switch (element.nodeName) {
        case 'HTML':
        case 'BODY':
            return element.ownerDocument.body;
        case '#document':
            return element.body;
        default:
    }
    // Firefox want us to check `-x` and `-y` variations as well
    var _a = getStyleComputedProperty(element), overflow = _a.overflow, overflowX = _a.overflowX, overflowY = _a.overflowY;
    if (/(auto|scroll|overlay)/.test(String(overflow) + String(overflowY) + String(overflowX))) {
        return element;
    }
    return getScrollParent(getParentNode(element));
}
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