How to close a sliding item in ionic 4?

@winningtech wrote:

#3 template

<ion-item-sliding *ngFor="let item of collection.items; let i = index">
    <ion-item>
        <ion-label>
            <span>
                {{ item.name }}
            </span>
        </ion-label>
        <ion-note slot="end" *ngFor="let myitem of item.myitems">
            <span>{{ myitem.quantity }}</span>
        </ion-note>
    </ion-item>
    <ion-item-options side="end">
        <ion-item-option (click)="addItem(collection.id, item.id)">
            <ion-icon slot="icon-only" name="add"></ion-icon>
        </ion-item-option>
    </ion-item-options>
</ion-item-sliding>

ts file

import { IonItemSliding } from '@ionic/angular';

addItem(slidingItem: IonItemSliding, collectionID: any, itemId: any) {
    slidingItem.closeOpened();
}

Results in ERROR TypeError: slidingItem.closeOpened is not a function

But the docs say otherwise: https://ionicframework.com/docs/api/item-sliding

So am I doing something wrong?

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