working w/ turf.js

turfUtils.ts

/*
 * turf docs:
 * - https://turfjs.org/docs/#nearestPoint
 * - https://turfjs.org/docs/#feature
 *
 * mapbox sample w/ turf:
 * - https://docs.mapbox.com/help/tutorials/analysis-with-turf/
 */

import { MapboxGeoJSONFeature } from "mapbox-gl"
import {
  point,
  featureCollection,
  nearestPoint,
  FeatureCollection,
  feature,
  Feature,
  Point,
  Geometry,
  GeometryCollection,
} from "@turf/turf"

export const getAllCoordinates = (mpxFeature: MapboxGeoJSONFeature): FeatureCollection<Point> => {
  // https://lodash.com/docs/#get
  //   _.get(object, 'a[0].b.c');
  // [3].value.features[0].geometry.coordinates
  // [3].value.features[1].geometry.coordinates
}

export const convert = (features: MapboxGeoJSONFeature[]): FeatureCollection => {
  // TODO convert a mapbox geojsonfeature array into a turn featurecollection
  const feature1: Feature<Geometry> = {
    type: "Feature",
    geometry: {
      type: "Point",
      coordinates: [22.489013671875, 58.43048192568003],
    },
    properties: {
      name: "Name",
    },
    id: 1,
  }

  const point1: Feature<Point> = point([28.948459, 41.024204])

  const coordinates = [
      [22.840576171875, 58.63121664342478],
      [23.1591796875, 58.551060622877486],
      [23.345947265625, 58.43623315794525],
      [22.554931640625, 58.14172026743037],
      [22.291259765625, 58.11851749586461],
  ]
  console.log(
    ">>>map:",
    coordinates.map((coordinate) => point(coordinate))
  )

  const myFeatureCollection: FeatureCollection<Point> = featureCollection([feature1, point1])

  nearestPoint(point1, myFeatureCollection)

  return myFeatureCollection
}