example.js

// subscribe to `CREATED`, `UPDATED` and `DELETED` mutations
this.newMessageObserver = this.props.client.subscribe({
  query: gql`
    subscription {
      Message {
        mutation # contains `CREATED`, `UPDATED` or `DELETED`
        node {
          text
          sentBy {
            name
          }
        }
      }
    }
  `,
  }).subscribe({
      next(data) {
      console.log('A mutation of the following type happened on the Message type: ', data.Message.mutation)
      console.log('The changed data looks as follows: ', data.Message.node)
    },
    error(error) {
      console.error('Subscription callback with error: ', error)
    },
})