How to use the event-emitter.call function in event-emitter

this.basePath = this.config.oauth2.host; //Auth Call

            this.authentications = {
                'basicAuth': {type: 'oauth2', accessToken: ''}
            };

            this.host = this.config.oauth2.host;

            this.initOauth();// jshint ignore:line

            if (this.config.accessToken) {
                this.setTicket(this.config.accessToken);
            }
        }

        Emitter.call(this);
    }

this.className = 'BpmAuth';

        this.config = config;
        this.ticket = undefined;

        this.basePath = config.hostBpm + '/' + this.config.contextRootBpm;   //Activiti Call

        this.authentications = {
            'basicAuth': {type: 'activiti', ticket: ''}
        };

        if (this.config.ticketBpm) {
            this.setTicket(config.ticketBpm);
        }

        Emitter.call(this);
    }

constructor(config) {
        config = this.configureJsApi(config);

        Emitter.call(this);
    }

constructor(host) {
        super();
        this.host = host;
        Emitter.call(this);
    }

this.bpmClient.on('unauthorized', ()=> {
            this.invalidateSession();
        });

        if (this.config.provider === 'OAUTH') {
            this.oauth2Auth = new Oauth2Auth(this.config);
            this.setAuthenticationClientECMBPM(this.oauth2Auth.getAuthentication(), this.oauth2Auth.getAuthentication());
        } else {
            this.bpmAuth = new BpmAuth(this.config);
            this.ecmAuth = new EcmAuth(this.config);
            this.setAuthenticationClientECMBPM(this.ecmAuth.getAuthentication(), this.bpmAuth.getAuthentication());
        }

        this.initObjects();

        Emitter.call(this);
    }

this.basePath = this.config.hostEcm + '/' + this.config.contextRoot + '/api/-default-/public/authentication/versions/1'; //Auth Call

        if (this.config.domainPrefix) {
            this.ticketStorageLabel = this.config.domainPrefix.concat('-ticket-ECM');
        } else {
            this.ticketStorageLabel = 'ticket-ECM';
        }

        if (this.config.ticketEcm) {
            this.setTicket(config.ticketEcm);
        } else if (this.storage.getItem(this.ticketStorageLabel)) {
            this.setTicket(this.storage.getItem(this.ticketStorageLabel));
        }

        Emitter.call(this);
    }

constructor() {
        super();
        Emitter.call(this);
    }