Mat select - Get old value of selectionChange

I have a project in which I have a form containing a mat-select selector. Whenever the user changes the input, I show the user a dialog to confirm this operation. Now:

The selectionChange() notifies when the value was changed and passes the new value as $event.

Is there a way to get the old value to return back in case when the user canceled the dialog?

I don't want to do the dirty way like, saving the current value in a seperate member variable.

Template:

<mat-select [(ngModel)]="selectedTextCountingType"
(selectionChange)="select($event)">
<mat-option *ngFor="let option of countingTypeOptions"
[value]="option.value">
{{option.text | translate}}
</mat-option>
</mat-select>


TS:

select(option: MatSelectChange): void {
this.openConfirmDeletionDialog().pipe(
filter((respose) => {
// HERE IS WHERE I NEED IT.
if(Boolean(reponse) === false) {
this.selectedTextCountingType = oldValue;
}
return Boolean(reponse);
})
)
}

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