Use the RenderRequested class for RenderRequested events.

<IgrDataChart
        dataSource={this.data}
        ref={this.onChartRef}
        width="100%"
        height="100%" >
<IgrCategoryXAxis name="xAxis" label="Country" />
<IgrNumericYAxis name="yAxis" minimumValue={0} />
<IgrColumnSeries name="series1"
        xAxisName="xAxis"
        yAxisName="yAxis"
        valueMemberPath="Coal"
        renderRequested= {this.OnRenderRequested}/>
 </IgrDataChart>

let series1 = new IgrColumnSeries({ name: "series1" });
series1.valueMemberPath = "USA";
series1.title = "USA";
series1.xAxisName = "xAxis";
series1.yAxisName = "yAxis";
series1.renderRequested = this.OnRenderRequested;

public OnRenderRequested =( s:IgrSeries, e:RenderRequestedEventArgs) => {

  }