Method connect

src/cdk/tree/tree.spec.ts:1565–1573

(collectionViewer: CollectionViewer)

  }

  connect(collectionViewer: CollectionViewer): Observable<TestData[]> {
    this.isConnected = true;

    return combineLatest([this._dataChange, collectionViewer.viewChange]).pipe(
      map(([data]) => {
        return data;
      }),
    );
  }

  disconnect() {
    this.isConnected = false;