@data-ui/xy-chart/esm/utils/collectVoronoiData.js

A package of charts with standard x- and y- axes. https://williaster.github.io/data-ui

import { Children } from 'react';
import AreaDifferenceSeries from '../series/AreaDifferenceSeries';
import { isSeries, isDefined, componentName } from './chartUtils'; // this function collects all data from child series to defines a voronoi overlay
// because x,y coordinates are required to define a voronoi, it filters any points
// with undefined x or y values

export default function collectVoronoiData(_ref) {
  var children = _ref.children,
      getX = _ref.getX,
      getY = _ref.getY;
  return Children.toArray(children).reduce(function (result, Child) {
    var name = componentName(Child);

    if (isSeries(name) && !Child.props.disableMouseEvents) {
      if (name === AreaDifferenceSeries.displayName) {
        return result.concat(collectVoronoiData({
          children: Child.props.children,
          getX: getX,
          getY: getY
        }));
      }

      return result.concat(Child.props.data.filter(function (d) {
        return isDefined(getX(d)) && isDefined(getY(d));
      }));
    }

    return result;
  }, []);
}