in src/sankeyDiagram.ts [325:350]
public update(visualUpdateOptions: VisualUpdateOptions): void {
// debugger;
this.visualHost.eventService.renderingStarted(visualUpdateOptions);
let sankeyDiagramDataView: SankeyDiagramDataView,
viewport: IViewport = visualUpdateOptions
&& visualUpdateOptions.viewport
|| SankeyDiagram.DefaultViewport,
dataView: DataView = visualUpdateOptions
&& visualUpdateOptions.dataViews
&& visualUpdateOptions.dataViews[0];
this.updateViewport(visualUpdateOptions.viewport);
sankeyDiagramDataView = this.converter(dataView);
this.computePositions(sankeyDiagramDataView);
this.dataView = sankeyDiagramDataView;
this.applySelectionStateToData();
this.render(sankeyDiagramDataView);
this.visualHost.eventService.renderingFinished(visualUpdateOptions);
}