How to use the @microsoft/fast-web-utilities.canUseFocusVisible function in @microsoft/fast-web-utilities

selector = "";
        styles = a;
    } else if (typeof a === "string") {
        selector = a;
        styles = b;
    } else {
        return {};
    }

    return Object.assign(
        {
            "&:focus": {
                outline: "none",
            },
        },
        canUseFocusVisible()
            ? {
                  [applyFocusVisibleSelector(selector)]: styles,
              }
            : {
                  [applyFocusVisiblePolyfillSelector(selector)]: styles,
              }
    );
}