How to use the msal.Constants function in msal

if (httpProvider && httpProvider.interceptors) {
                        httpProvider.interceptors.push('ProtectedResourceInterceptor');
                    }

                    // create instance with given config
                    _msal = new Msal.UserAgentApplication(configOptions.clientID, configOptions.authority, configOptions.tokenReceivedCallback, configOptions.optionalParams);
                    if (configOptions.routeProtectionConfig) {
                        _msal.routeProtectionConfig = configOptions.routeProtectionConfig;
                    }
                    else {
                        _msal.routeProtectionConfig = {};
                    }

                    _msal.loginScopes = [_msal.clientId];
                    _constants = Msal.Constants;

                } else {
                    throw new Error('You must set configOptions, when calling init');
                }
                // loginResource is used to set authenticated status
                updateDataFromCache(_msal.loginScopes);
            };