how to use GeometryUtil.destination in Angular2+ ?

[haoliangyu]

Angular 2+ uses TypeScript so you need the type definition to use this library. Unfortunately a dedicated type definition for this library doesn't exist yet. But you can still write a minimal .d.ts file just for the destination() function and import it into your TS project. As an example, you can take a look at this.

[jbaranski]

This worked for me (this makes a big assumption you're using ngx-leaflet and already have it working in your Angular2+ app):

1. Add src/typings.d.ts, the content looks like below (just add more functions as needed):

   import * as L from 'leaflet';
   declare module 'leaflet' {
   export class GeometryUtil {
   static computeAngle(a: L.Point, b: L.Point): number;
   static closest(map: L.Map, layer: L.Layer, latlng: L.LatLng, vertices?: boolean): L.LatLng;
   }
   }

2. npm install leaflet-geometryutil
3. import 'leaflet-geometryutil' in some file (component, service, whatever...)
4. Make calls like const latlng: LatLng = GeometryUtil.closest(this.map, this.polyline, map.getBounds().getCenter())