AccountSpy.xml

<aura:component implements="force:appHostable,flexipage:availableForAllPageTypes" access="global" >
    
    <!--Include EmpApiDemo child component and pass channel name to subscribe
     	ex: "/topic/AccountSpy" is my pushtopic channel name
  		once the event is fired, it will handled in handleMessage controller method -->
    <c:EmpApiDemo channelName="/topic/AccountSpy" onEmpEvent="{!c.handleMessage}" />
    
    <!-- lightning card to display detail -->
    <lightning:card footer="This component displays account changes using lightning:empApi component" 
                    title="Account Spy"
                    iconName="standard:search">
        <div id="output">
        </div>
    </lightning:card>
</aura:component>