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angular material - Determine an Expansion Panel is opened or closed

app.component.html 

<h2 style="padding-top:25px; padding-bottom:25px;">
  Angular Material - How to determine whether an
    Expansion Panel is opened or closed
</h2>


<h3>
  Expansion Panel is now :
  {{panel.expanded? 'Opened' : 'Closed'}}
</h3>

<mat-expansion-panel #panel>
  <mat-expansion-panel-header>
    <mat-panel-title>Node.js</mat-panel-title>
  </mat-expansion-panel-header>
  Lorem ipsum dolor sit amet, consectetur adipiscing elit.
  Integer vitae semper massa. Donec maximus, dui nec
  dignissim blandit, ante odio varius ex,
  nec volutpat erat justo ac magna.
</mat-expansion-panel>
app.module.ts [import] 

import {MatExpansionModule} from '@angular/material/expansion'
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