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How to close modal dialog in Lighting component ?

 Lightning Web Components

Lightning Web Components are supported in Quick Action after 21, Here is the code to close popup.

First Import library 

import { CloseActionScreenEvent } from 'lightning/actions';

Dispatch event when we want to close popup

this.dispatchEvent(new CloseActionScreenEvent());

XML code
<targets>
  <target>lightning__RecordAction</target>
</targets>
<targetConfigs>
  <targetConfig targets="lightning__RecordAction">
    <actionType>ScreenAction</actionType>
  </targetConfig>
</targetConfigs>

Lightning Aura Components
It is very easy to close aura modal, we need
$A.get("e.force:closeQuickAction").fire();

Here is controller code 
({
closeMethodInAuraController : function(component, event, helper) {
$A.get("e.force:closeQuickAction").fire();
}
})

Lightning Aura Components + Lightning LWC Components
When LWC component is wrapped inside aura component.

1. Dispatch an event from LWC component

 const closeQA = new CustomEvent('close');
        // Dispatches the event.
        this.dispatchEvent(closeQA);

2. Have Listener defined in Aura to close popup. 
<c:lwcComponent onclose="{!c.closeMethodInAuraController}" recordId="{!v.recordId}"/>

Aura Component 
<aura:component implements="force:lightningQuickActionWithoutHeader,force:hasRecordId">

    <aura:html tag="style">
.cuf-content {
  padding: 0 0rem !important;
}
.slds-p-around--medium {
  padding: 0rem !important;
}
.slds-modal__content{
  overflow-y:hidden !important;
  height:unset !important;
  max-height:unset !important;
}
</aura:html>
    <c:cloneLead onclose="{!c.closeMethodInAuraController}" recordId="{!v.recordId}"/>
</aura:component>

Controller
({ closeMethodInAuraController : function(component, event, helper) { $A.get("e.force:closeQuickAction").fire(); } })

 <aura:html> code just make background style.

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