1.2.1-alpha.1 to solve #2

package.json

@@ -1,6 +1,6 @@
 {
   "name": "leaflet-paintpolygon",
-  "version": "1.2.0",
+  "version": "1.2.1-alpha.1",
   "description": "Leaflet plugin to create polygon with circle, for touchscreen",
   "main": "dist/Leaflet.PaintPolygon.js",
   "scripts": {
@@ -27,18 +27,16 @@
   },
   "homepage": "https://github.com/tcoupin/leaflet-paintpolygon#readme",
   "devDependencies": {
-    "@turf/circle": "^6.0.1",
-    "@turf/difference": "^6.0.1",
-    "@turf/union": "^6.0.1",
+    "turf": "7.0.0-alpha.1",
     "clean-webpack-plugin": "^0.1.19",
     "css-loader": "^0.28.11",
     "file-loader": "^1.1.11",
     "leaflet": "^1.3.1",
     "style-loader": "^0.21.0",
     "url-loader": "^1.0.1",
-    "webpack": "^4.8.3",
-    "webpack-cli": "^2.1.3",
-    "webpack-dev-server": "^3.1.4"
+    "webpack": "^4",
+    "webpack-cli": "^3",
+    "webpack-dev-server": "^3"
   },
   "dependencies": {}
 }

src/PaintPolygon.js

@@ -254,7 +254,11 @@ const PaintPolygon = L.Control.extend({
         if (this._data === undefined || this._data === null) {
             this.setData(this._getCircleAsPolygon(latlng, zoom, radius));
         } else {
-            this.setData(turf.union(this._data, this._getCircleAsPolygon(latlng, zoom, radius)));
+            let fc = {
+                type: "FeatureCollection",
+                features:[this._data, this._getCircleAsPolygon(latlng, zoom, radius)]
+            };
+            this.setData(turf.union(fc));
         }
     },
     _erase: function(latlng, zoom, radius) {

src/myTurf.js

@@ -1,6 +1,6 @@
-import circle from '@turf/circle';
-import union from '@turf/union';
-import difference from '@turf/difference';
+import circle from 'turf/src/circle';
+import union from 'turf/src/union/';
+import difference from 'turf/src/difference';
 
 
 let turf = {