on(eventName, listener) { // if the instance has an error handler set then we don't need to // skips error logging if (eventName.toLowerCase() === 'error') { this.errorListenerSet = true; } super.on.call(this, eventName, listener); }
output1.on('data', data => console.log('output1', data));
output2.on('data', data => console.log('output2', data));