How to use the msal.Constants.angularLoginRequest function in msal

canActivate(route, state) {
        this.authService.getLogger().verbose("location change event from old url to new url");
        this.authService.updateDataFromCache([this.config.clientID]);
        if (!this.authService._oauthData.isAuthenticated && !this.authService._oauthData.userName) {
            if (state.url) {
                if (!this.authService._renewActive && !this.authService.loginInProgress()) {
                    var loginStartPage = this.getBaseUrl() + state.url;
                    if (loginStartPage !== null) {
                        this.authService.getCacheStorage().setItem(Constants.angularLoginRequest, loginStartPage);
                    }
                    if (this.config.popUp) {
                        return new Promise((resolve, reject) => {
                            this.authService.loginPopup(this.config.consentScopes, this.config.extraQueryParameters).then(function (token) {
                                resolve(true);
                            }, function (error) {
                                reject(false);
                            });
                        });
                    }
                    else {
                        this.authService.loginRedirect(this.config.consentScopes, this.config.extraQueryParameters);
                    }
                }
            }
        }

canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean | Promise {
        this.authService.getLogger().verbose("location change event from old url to new url");

        this.authService.updateDataFromCache([this.config.clientID]);
        if (!this.authService._oauthData.isAuthenticated && this.isObjectEmpty(this.authService._oauthData.idToken)) {
            if (state.url) {

                if (!this.authService._renewActive && !this.authService.loginInProgress()) {

                    var loginStartPage = this.getBaseUrl() + state.url;
                    if (loginStartPage !== null) {
                        this.authService.getCacheStorage().setItem(Constants.angularLoginRequest, loginStartPage);
                    }
                    if (this.config.popUp) {
                        return this.authService.loginPopup(this.config.consentScopes, this.config.extraQueryParameters)
                            .then(function (token) {
                               return true;
                            }, function (error) {
                                return false;
                            });
                    }
                    else {
                        this.authService.loginRedirect(this.config.consentScopes, this.config.extraQueryParameters);
                    }
                }
            }
        }
        //token is expired/deleted but userdata still exists in _oauthData object