Typescript

[razaqq]

not entirely sure how to use this in typescript when importing stuff from leaflet like this

import {
  Map, Layer, MapOptions, TileLayer, CRS, tileLayer,
  TileLayerOptions, LeafletMouseEvent, LeafletEvent, Canvas, canvas, circleMarker
} from 'leaflet';

i tried:

import {markersCanvas} from 'leaflet-markers-canvas';

import * as L from 'leaflet-markers-canvas';

import 'leaflet-markers-canvas';
import * as L from 'leaflet';

would be good to make this properly for typescript

you can ofc do this, but this is like a giant mess

import 'leaflet-markers-canvas';
// @ts-ignore
import { MarkersCanvas } from 'leaflet';

and even in that case im getting:

ERROR TypeError: n is undefined
    _addMarker leaflet-markers-canvas.min.js:1
    addMarkers leaflet-markers-canvas.min.js:1
    addMarkers leaflet-markers-canvas.min.js:1

[ShadowZone]

Hi, I use this plugin with TS in our current project. I know, this is kind of a workaround but you can work with it until somebody implements a TS-style way to import the plugin.

First I wrote a little declaration file for the plugin: projectpath/@types/leaflet-markers-canvas/index.d.ts

import 'leaflet';

declare module 'leaflet' {
  export class MarkersCanvas extends Layer {
    addTo(map:Map|LayerGroup):this;
    addMarker(marker:Marker):void;
    addMarkers(markers:Array<Marker>):void;
    getBounds():LatLngBounds;
    redraw():void;
    clear():void;
    removeMarker(marker:Marker):void;
  }
  function markersCanvas(): MarkersCanvas;
}

If you haven't created a local @types directory before you need to add it to your tsconfig.json:

{
  "compilerOptions": {
    ......
    "typeRoots": [ "./projectpath/@types", "./node_modules/@types"]
  },
  .....
  "exclude": [ "./projectpath/@types", "./node_modules/@types"]
}

Now, in your main source code, you can "import" the plugin like so (half pseudo code):

import * as L from "leaflet";
require("../libs/canvas-element-layer");

class NewMap {
  private _map: L.Map;
  private _markersCanvas: L.MarkersCanvas;
  constructor(map: L.Map) {
    this._map = map;
    this._markersCanvas = new L.MarkersCanvas();
    // you can also use: this._markersCanvas = L.markersCanvas();
    this._markersCanvas.addTo(this._map);
  }
}

I hope this helps :-)

[Alberto-Amo-Marin]

Another thing you can do is:

And then:

import MarkersCanvas from 'path/where/is/the/library/leaflet-markers-canvas.js)';

var markersCanvas = new MarkersCanvas();
markersCanvas.addTo(map);

//Create your marker
var marker = L.marker(
    [58.5578 + Math.random() * 1.8, 29.0087 + Math.random() * 3.6],
    { icon }
  );

//Add your marker to the MarkersCanvas
markersCanvas.addMarker(marker)