JavaScript Data GridRow Selection

import {
  ClientSideRowModelModule,
  GridApi,
  GridOptions,
  ModuleRegistry,
  RowSelectionMode,
  RowSelectionModule,
  createGrid,
  enableDevValidations,
} from "ag-grid-community";
import {
  ColumnMenuModule,
  ColumnsToolPanelModule,
  ContextMenuModule,
  RowGroupingModule,
} from "ag-grid-enterprise";
import { IOlympicData } from "./interfaces";

if (process.env.NODE_ENV !== "production") {
  // Enable extended validations only for development
  enableDevValidations();
}

ModuleRegistry.registerModules([
  RowSelectionModule,
  ClientSideRowModelModule,
  ColumnsToolPanelModule,
  ColumnMenuModule,
  ContextMenuModule,
  RowGroupingModule,
]);

let gridApi: GridApi<IOlympicData>;

const gridOptions: GridOptions<IOlympicData> = {
  columnDefs: [
    { field: "athlete", minWidth: 150 },
    { field: "age", maxWidth: 90 },
    { field: "country", minWidth: 150 },
    { field: "year", maxWidth: 90 },
    { field: "date", minWidth: 150 },
    { field: "sport", minWidth: 150 },
    { field: "gold" },
    { field: "silver" },
    { field: "bronze" },
    { field: "total" },
  ],
  defaultColDef: {
    flex: 1,
    minWidth: 100,
  },
  rowSelection: {
    mode: "singleRow",
  },
};

const gridDiv = document.querySelector<HTMLElement>("#myGrid")!;
gridApi = createGrid(gridDiv, gridOptions);

fetch("https://www.ag-grid.com/example-assets/small-olympic-winners.json")
  .then((response) => response.json())
  .then((data: IOlympicData[]) => gridApi.setGridOption("rowData", data));

function getSelectValue(id: string): RowSelectionMode {
  return (
    (document.querySelector<HTMLSelectElement>(id)
      ?.value as RowSelectionMode) ?? "singleRow"
  );
}

function updateSelectionOptions() {
  gridApi.setGridOption("rowSelection", {
    mode: getSelectValue("#input-selection-mode"),
  });
}

if (typeof window !== "undefined") {
  // Attach external event handlers to window so they can be called from index.html
  (<any>window).updateSelectionOptions = updateSelectionOptions;
}

.example-wrapper {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.example-header {
    margin-bottom: 10px;
}

#myGrid {
    flex: 1 1 0px;
    width: 100%;
}

<div class="example-wrapper">
    <div class="example-header">
        <label>
            <span>Selection mode: </span>
            <select id="input-selection-mode" onchange="updateSelectionOptions()">
                <option value="singleRow">singleRow</option>
                <option value="multiRow">multiRow</option>
            </select>
        </label>
    </div>
    <div id="myGrid" style="height: 100%"></div>
</div>

export interface IOlympicData {
    athlete: string,
    age: number,
    country: string,
    year: number,
    date: string,
    sport: string,
    gold: number,
    silver: number,
    bronze: number,
    total: number
}