storage.js

// If localStorage is not really required, this will at least provide storage while the app is running.

var storage = typeof window.localStorage !== "unknown" ? window.localStorage : {
	getItem: function(key) {
		return (this.items || (this.items = {}))[key];
	},
	setItem: function(key, value) {
		(this.items || (this.items = {}))[key] = value;
	},
	clear: function() {
		this.items = {}
	},
	removeItem: function() {
		delete (this.items || (this.items = {}))[key];
	}
};

// And later, where you passed in window.localStorage, pass in storage instead.

TourService.prototype.start = function() {
    this.tour = new window.Tour({
        name: "ConfiguratorTour",
        steps: [],
        container: "body",
        smartPlacement: !0,
        keyboard: !0,
        storage: storage,
        debug: !1,
        backdrop: !0,
        backdropContainer: "body",
        backdropPadding: 0,
        redirect: !0,
        orphan: !1,
        duration: !1,
        delay: !1,
        basePath: ""
    })
    // ... And change
    // window.localStorage.clear()
    // to
    storage.clear()
}