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Components (Lifecycle (ngOnChanges(arg: SimpleChanges) after bound input…

- - - - to be visible outside (by parent/hosting component)
        Input() decorator
      - property of child component is accessible
        in parent html by using [propName]
      - to alias use Input('alias') decorator
      - property on comp class
        can be used in html
    - - in child
        property of type EventEmiter<eventData>
      - run by this.eventCreated.emit(data)
      - on parent
        <child-elem (childEvent)="parentMethod($event)"/>
      - add Output(['Alias']) attribute