/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
/** Cached result of the way the browser handles the horizontal scroll axis in RTL mode. */
let rtlScrollAxisType;
/** Cached result of the check that indicates whether the browser supports scroll behaviors. */
let scrollBehaviorSupported;
/** Check whether the browser supports scroll behaviors. */
export function supportsScrollBehavior() {
    if (scrollBehaviorSupported == null) {
        // If we're not in the browser, it can't be supported. Also check for `Element`, because
        // some projects stub out the global `document` during SSR which can throw us off.
        if (typeof document !== 'object' || !document || typeof Element !== 'function' || !Element) {
            scrollBehaviorSupported = false;
            return scrollBehaviorSupported;
        }
        // If the element can have a `scrollBehavior` style, we can be sure that it's supported.
        if ('scrollBehavior' in document.documentElement.style) {
            scrollBehaviorSupported = true;
        }
        else {
            // At this point we have 3 possibilities: `scrollTo` isn't supported at all, it's
            // supported but it doesn't handle scroll behavior, or it has been polyfilled.
            const scrollToFunction = Element.prototype.scrollTo;
            if (scrollToFunction) {
                // We can detect if the function has been polyfilled by calling `toString` on it. Native
                // functions are obfuscated using `[native code]`, whereas if it was overwritten we'd get
                // the actual function source. Via https://davidwalsh.name/detect-native-function. Consider
                // polyfilled functions as supporting scroll behavior.
                scrollBehaviorSupported = !/\{\s*\[native code\]\s*\}/.test(scrollToFunction.toString());
            }
            else {
                scrollBehaviorSupported = false;
            }
        }
    }
    return scrollBehaviorSupported;
}
/**
 * Checks the type of RTL scroll axis used by this browser. As of time of writing, Chrome is NORMAL,
 * Firefox & Safari are NEGATED, and IE & Edge are INVERTED.
 */
export function getRtlScrollAxisType() {
    // We can't check unless we're on the browser. Just assume 'normal' if we're not.
    if (typeof document !== 'object' || !document) {
        return 0 /* RtlScrollAxisType.NORMAL */;
    }
    if (rtlScrollAxisType == null) {
        // Create a 1px wide scrolling container and a 2px wide content element.
        const scrollContainer = document.createElement('div');
        const containerStyle = scrollContainer.style;
        scrollContainer.dir = 'rtl';
        containerStyle.width = '1px';
        containerStyle.overflow = 'auto';
        containerStyle.visibility = 'hidden';
        containerStyle.pointerEvents = 'none';
        containerStyle.position = 'absolute';
        const content = document.createElement('div');
        const contentStyle = content.style;
        contentStyle.width = '2px';
        contentStyle.height = '1px';
        scrollContainer.appendChild(content);
        document.body.appendChild(scrollContainer);
        rtlScrollAxisType = 0 /* RtlScrollAxisType.NORMAL */;
        // The viewport starts scrolled all the way to the right in RTL mode. If we are in a NORMAL
        // browser this would mean that the scrollLeft should be 1. If it's zero instead we know we're
        // dealing with one of the other two types of browsers.
        if (scrollContainer.scrollLeft === 0) {
            // In a NEGATED browser the scrollLeft is always somewhere in [-maxScrollAmount, 0]. For an
            // INVERTED browser it is always somewhere in [0, maxScrollAmount]. We can determine which by
            // setting to the scrollLeft to 1. This is past the max for a NEGATED browser, so it will
            // return 0 when we read it again.
            scrollContainer.scrollLeft = 1;
            rtlScrollAxisType =
                scrollContainer.scrollLeft === 0 ? 1 /* RtlScrollAxisType.NEGATED */ : 2 /* RtlScrollAxisType.INVERTED */;
        }
        scrollContainer.remove();
    }
    return rtlScrollAxisType;
}
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Also check for `Element`, because\n    // some projects stub out the global `document` during SSR which can throw us off.\n    if (typeof document !== 'object' || !document || typeof Element !== 'function' || !Element) {\n      scrollBehaviorSupported = false;\n      return scrollBehaviorSupported;\n    }\n\n    // If the element can have a `scrollBehavior` style, we can be sure that it's supported.\n    if ('scrollBehavior' in document.documentElement!.style) {\n      scrollBehaviorSupported = true;\n    } else {\n      // At this point we have 3 possibilities: `scrollTo` isn't supported at all, it's\n      // supported but it doesn't handle scroll behavior, or it has been polyfilled.\n      const scrollToFunction: Function | undefined = Element.prototype.scrollTo;\n\n      if (scrollToFunction) {\n        // We can detect if the function has been polyfilled by calling `toString` on it. Native\n        // functions are obfuscated using `[native code]`, whereas if it was overwritten we'd get\n        // the actual function source. Via https://davidwalsh.name/detect-native-function. Consider\n        // polyfilled functions as supporting scroll behavior.\n        scrollBehaviorSupported = !/\\{\\s*\\[native code\\]\\s*\\}/.test(scrollToFunction.toString());\n      } else {\n        scrollBehaviorSupported = false;\n      }\n    }\n  }\n\n  return scrollBehaviorSupported;\n}\n\n/**\n * Checks the type of RTL scroll axis used by this browser. As of time of writing, Chrome is NORMAL,\n * Firefox & Safari are NEGATED, and IE & Edge are INVERTED.\n */\nexport function getRtlScrollAxisType(): RtlScrollAxisType {\n  // We can't check unless we're on the browser. Just assume 'normal' if we're not.\n  if (typeof document !== 'object' || !document) {\n    return RtlScrollAxisType.NORMAL;\n  }\n\n  if (rtlScrollAxisType == null) {\n    // Create a 1px wide scrolling container and a 2px wide content element.\n    const scrollContainer = document.createElement('div');\n    const containerStyle = scrollContainer.style;\n    scrollContainer.dir = 'rtl';\n    containerStyle.width = '1px';\n    containerStyle.overflow = 'auto';\n    containerStyle.visibility = 'hidden';\n    containerStyle.pointerEvents = 'none';\n    containerStyle.position = 'absolute';\n\n    const content = document.createElement('div');\n    const contentStyle = content.style;\n    contentStyle.width = '2px';\n    contentStyle.height = '1px';\n\n    scrollContainer.appendChild(content);\n    document.body.appendChild(scrollContainer);\n\n    rtlScrollAxisType = RtlScrollAxisType.NORMAL;\n\n    // The viewport starts scrolled all the way to the right in RTL mode. If we are in a NORMAL\n    // browser this would mean that the scrollLeft should be 1. If it's zero instead we know we're\n    // dealing with one of the other two types of browsers.\n    if (scrollContainer.scrollLeft === 0) {\n      // In a NEGATED browser the scrollLeft is always somewhere in [-maxScrollAmount, 0]. For an\n      // INVERTED browser it is always somewhere in [0, maxScrollAmount]. We can determine which by\n      // setting to the scrollLeft to 1. This is past the max for a NEGATED browser, so it will\n      // return 0 when we read it again.\n      scrollContainer.scrollLeft = 1;\n      rtlScrollAxisType =\n        scrollContainer.scrollLeft === 0 ? RtlScrollAxisType.NEGATED : RtlScrollAxisType.INVERTED;\n    }\n\n    scrollContainer.remove();\n  }\n  return rtlScrollAxisType;\n}\n"]}