JavaScript Data GridExternal Filter

import {
  ClientSideRowModelModule,
  ColDef,
  DateFilterModule,
  ExternalFilterModule,
  GridApi,
  GridOptions,
  IDateFilterParams,
  IRowNode,
  ModuleRegistry,
  NumberFilterModule,
  createGrid,
  enableDevValidations,
} from "ag-grid-community";
import {
  ColumnMenuModule,
  ColumnsToolPanelModule,
  ContextMenuModule,
  SetFilterModule,
} from "ag-grid-enterprise";
import { IOlympicData } from "./interfaces";

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

ModuleRegistry.registerModules([
  ExternalFilterModule,
  ClientSideRowModelModule,
  ColumnsToolPanelModule,
  ColumnMenuModule,
  ContextMenuModule,
  SetFilterModule,
  NumberFilterModule,
  DateFilterModule,
]);

const dateFilterParams: IDateFilterParams = {
  comparator: (filterLocalDateAtMidnight: Date, cellValue: string) => {
    const cellDate = asDate(cellValue);

    if (filterLocalDateAtMidnight.getTime() === cellDate.getTime()) {
      return 0;
    }

    if (cellDate < filterLocalDateAtMidnight) {
      return -1;
    }

    if (cellDate > filterLocalDateAtMidnight) {
      return 1;
    }
    return 0;
  },
};

const columnDefs: ColDef[] = [
  { field: "athlete", minWidth: 180 },
  { field: "age", filter: "agNumberColumnFilter" },
  { field: "country" },
  { field: "year" },
  {
    field: "date",
    filter: "agDateColumnFilter",
    filterParams: dateFilterParams,
  },
  { field: "total", filter: "agNumberColumnFilter" },
];

let gridApi: GridApi<IOlympicData>;

const gridOptions: GridOptions<IOlympicData> = {
  columnDefs: columnDefs,
  defaultColDef: {
    flex: 1,
    minWidth: 120,
    filter: true,
  },
  isExternalFilterPresent: isExternalFilterPresent,
  doesExternalFilterPass: doesExternalFilterPass,
};

let ageType = "everyone";

function isExternalFilterPresent(): boolean {
  // if ageType is not everyone, then we are filtering
  return ageType !== "everyone";
}

function doesExternalFilterPass(node: IRowNode<IOlympicData>): boolean {
  if (node.data) {
    switch (ageType) {
      case "below25":
        return node.data.age < 25;
      case "between25and50":
        return node.data.age >= 25 && node.data.age <= 50;
      case "above50":
        return node.data.age > 50;
      case "dateAfter2008":
        return asDate(node.data.date) > new Date(2008, 0, 1);
      default:
        return true;
    }
  }
  return true;
}

function asDate(dateAsString: string) {
  const splitFields = dateAsString.split("/");
  return new Date(
    Number.parseInt(splitFields[2]),
    Number.parseInt(splitFields[1]) - 1,
    Number.parseInt(splitFields[0]),
  );
}

function externalFilterChanged(newValue: string) {
  ageType = newValue;
  gridApi!.onFilterChanged();
}

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

fetch("https://www.ag-grid.com/example-assets/olympic-winners.json")
  .then((response) => response.json())
  .then(function (data) {
    (document.querySelector("#everyone") as HTMLInputElement).checked = true;
    gridApi!.setGridOption("rowData", data);
  });

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

.test-container {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.test-header {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    font-size: 13px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-around;
    border: 1px solid grey;
    padding: 10px;
    border-radius: 5px;
}

<div class="test-container">
    <div class="test-header">
        <label>
            <input type="radio" name="filter" id="everyone" onchange="externalFilterChanged('everyone')" />
            Everyone
        </label>
        <label>
            <input type="radio" name="filter" id="below25" onchange="externalFilterChanged('below25')" />
            Below 25
        </label>
        <label>
            <input type="radio" name="filter" id="between25and50" onchange="externalFilterChanged('between25and50')" />
            Between 25 and 50
        </label>
        <label>
            <input type="radio" name="filter" id="above50" onchange="externalFilterChanged('above50')" />
            Above 50
        </label>
        <label>
            <input type="radio" name="filter" id="dateAfter2008" onchange="externalFilterChanged('dateAfter2008')" />
            After 01/01/2008
        </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
}