bench.js

import Supercluster from "./index.js";
import v8 from "v8";

const points = [];
for (let i = 0; i < 1000000; i++) {
  points.push({
    type: "Feature",
    properties: {
      index: i,
    },
    geometry: {
      type: "Point",
      coordinates: [-180 + 360 * Math.random(), -80 + 160 * Math.random()],
    },
  });
}

global.gc();
const size = v8.getHeapStatistics().used_heap_size;

const index = new Supercluster({
  log: true,
  maxZoom: 6,
  // map: props => ({sum: props.index}),
  // reduce: (accumulated, props) => { accumulated.sum += props.sum; }
  getId: (point) => point.properties.index,
}).load(points);

global.gc();
console.log(
  `memory used: ${Math.round((v8.getHeapStatistics().used_heap_size - size) / 1024)} KB`,
);

index
  .getClusters([-180, -90, 180, 90], 0)
  .map((f) => JSON.stringify(f.properties));