incognito.js

var incognito = function(require, module, exports) {
    "use strict";
    function isWebkitRequestFileSystem() {
        return !!window.webkitRequestFileSystem
    }
    function isFirefoxIndexedDB() {
        return !!window.indexedDB && /Firefox/.test(window.navigator.userAgent)
    }
    function isIE10PlusOrEdge() {
        if (document.documentMode) {
            var e = window.navigator.userAgent.match(/(?:MSIE|Trident.*rv:)\s*([\d\.]+)/i);
            return "object" === (void 0 === e ? "undefined" : _typeof(e)) && parseInt(e[1]) >= 10
        }
        return !!window.StyleMedia && /Edge\//i.test(window.navigator.userAgent)
    }
    function isSafariLocalStorage() {
        return !!window.localStorage && /Safari/.test(window.navigator.userAgent)
    }
    function detectWebkitRequestFileSystem(e, t) {
        return new Promise(function(e) {
            if (!window.webkitRequestFileSystem)
                return e(null);
            window.webkitRequestFileSystem(window.TEMPORARY, 1, e.bind(null, !1), e.bind(null, !0))
        }
        )
    }
    function detectFirefoxIndexedDB() {
        return new Promise(function(e) {
            if (!window.indexedDB)
                return e(null);
            var t = void 0;
            try {
                t = window.indexedDB.open("test")
            } catch (t) {
                return e(!0)
            }
            var n = 0
              , i = window.setInterval(function() {
                if ("done" === t.readyState) {
                    var o = !t.result;
                    return window.clearInterval(i),
                    e(o)
                }
                if (++n >= 50)
                    return window.clearInterval(i),
                    e(null)
            }, 10)
        }
        )
    }
    function detectIE10PlusOrEdge() {
        return new Promise(function(e) {
            try {
                return e(window.indexedDB ? !1 : !0)
            } catch (t) {
                return e(!0)
            }
        }
        )
    }
    function detectSafariLocalStorage() {
        return new Promise(function(e) {
            if (!window.localStorage)
                return e(null);
            try {
                window.localStorage.setItem("test", 1),
                window.localStorage.removeItem("test")
            } catch (t) {
                return e(!0)
            }
            return e(!1)
        }
        )
    }
    function detectIncognito() {
        return new Promise(function(e) {
            if (incognitoCheckIsDisabled())
                return e("disabled");
            for (var t in detects) {
                var n = _slicedToArray(detects[t], 3)
                  , i = n[1]
                  , o = n[2];
                if (i())
                    return e(o())
            }
            return e(null)
        }
        )
    }
    function debugIncognito() {
        var e = detects.map(function(e) {
            var t = _slicedToArray(e, 3)
              , n = t[0]
              , i = t[1];
            return (0,
            t[2])().then(function(e) {
                return {
                    label: n,
                    browser: i(),
                    incognito: e
                }
            })
        });
        return Promise.all(e)
    }
    function incognitoCheckIsDisabled() {
        return hasIncognitoCheckDisabledCookie() || hasIncognitoCheckDisabledQuery()
    }
    function hasIncognitoCheckDisabledCookie() {
        return new RegExp(COOKIE_NAME + "=" + COOKIE_VALUE).test(document.cookie)
    }
    function hasIncognitoCheckDisabledQuery() {
        return new RegExp("[?&]" + URL_PARAM).test(window.location.search)
    }
    function setIncognitoCheckDisabled() {
        var e = new Date;
        e.setTime(e.getTime() + 31104e6),
        document.cookie = COOKIE_NAME + "=" + COOKIE_VALUE + "; expires=" + e.toUTCString() + "; path=/"
    }
    function init() {
        hasIncognitoCheckDisabledQuery() && setIncognitoCheckDisabled()
    }
    var _slicedToArray = function() {
        function e(e, t) {
            var n = []
              , i = !0
              , o = !1
              , r = void 0;
            try {
                for (var c, u = e[Symbol.iterator](); !(i = (c = u.next()).done) && (n.push(c.value),
                !t || n.length !== t); i = !0)
                    ;
            } catch (e) {
                o = !0,
                r = e
            } finally {
                try {
                    !i && u.return && u.return()
                } finally {
                    if (o)
                        throw r
                }
            }
            return n
        }
        return function(t, n) {
            if (Array.isArray(t))
                return t;
            if (Symbol.iterator in Object(t))
                return e(t, n);
            throw new TypeError("Invalid attempt to destructure non-iterable instance")
        }
    }()
      , _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function(e) {
        return typeof e
    }
    : function(e) {
        return e && "function" == typeof Symbol && e.constructor === Symbol && e !== Symbol.prototype ? "symbol" : typeof e
    }
      , COOKIE_NAME = "mittr-incognito-check-disabled"
      , COOKIE_VALUE = "1"
      , URL_PARAM = "disable-incognito-check"
      , detects = [["Webkit RequestFileSystem", isWebkitRequestFileSystem, detectWebkitRequestFileSystem], ["Firefox IndexedDB", isFirefoxIndexedDB, detectFirefoxIndexedDB], ["IE10+ / Edge", isIE10PlusOrEdge, detectIE10PlusOrEdge], ["Safari LocalStorage", isSafariLocalStorage, detectSafariLocalStorage]];
    init(),
    module.exports = {
        detectIncognito: detectIncognito,
        debugIncognito: debugIncognito
    };
}

How can I use this?

Please refer to https://medium.com/free-code-camp/disabling-browser-incognito-check-cc84288e89b3