text: 
  import SuperMulticluster 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 SuperMulticluster({log: true, maxZoom: 6}).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));
  