Event API

 
  await client.query.system.events(async (eventRecords) => {
    const transferEvents = client.events.balances.Transfer.filter(eventRecords);
  
    transferEvents.forEach((event, index) => {
      console.log(`Transfer event ${index + 1}:`, event.palletEvent.data);
    });
  });
 

 
  await client.query.system.events(async (eventRecords) => {
    for (const tx of eventRecords) {
      if (client.events.system.ExtrinsicFailed.is(tx.event)) {
        const { dispatchError } = tx.event.palletEvent.data;
        if (client.errors.template.NoneValue.is(dispatchError)) {
          console.log('Template.NoneValue error occurred!');
        } else {
          console.log('Other error occurred', dispatchError);
        }
      }
    }
  });