webdev01/utils/queryAllFeatures.tsx

import FeatureLayer from '@arcgis/core/layers/FeatureLayer';
import Query from '@arcgis/core/rest/support/Query';
import Graphic from '@arcgis/core/Graphic';

const queryAllFeatures = async (
  layer: FeatureLayer,
  baseQuery: Partial<Query>,
  pageSize = 2000
): Promise<Graphic[]> => {
  const allFeatures: Graphic[] = [];
  let resultOffset = 0;
  let hasMore = true;

  while (hasMore) {
    const query = layer.createQuery();
    Object.assign(query, baseQuery);
    (query as any).resultOffset = resultOffset; // ArcGIS supports this, but it's not in TS type
    (query as any).resultRecordCount = pageSize;

    const result = await layer.queryFeatures(query);
    allFeatures.push(...result.features);

    hasMore = result.exceededTransferLimit === true;
    resultOffset += pageSize;
  }

  return allFeatures;
};
export default queryAllFeatures;