orchidmap-front/src/utils/simplify.js

import L from 'leaflet';

export const simplify = ({ map, latlngs }) => {
  const points = [];
  const target = [];
  const zoom = 12;
  const mul = 0.7; // 0 - not simplifying, 1 - very rude.
  // its better to estimate mul value by route length

  for (let i = 0; i < latlngs.length; i += 1) {
    points.push(map.project({ lat: latlngs[i].lat, lng: latlngs[i].lng }, zoom));
  }

  const simplified = L.LineUtil.simplify(points, mul);

  for (let i = 0; i < simplified.length; i += 1) {
    target.push(map.unproject(simplified[i], zoom));
  }

  return target;
};