updated leaflet-curve definition (#37795)

types/leaflet-curve/index.d.ts

@@ -1,14 +1,33 @@
 // Type definitions for leaflet-curve 0.1
 // Project: https://github.com/onikiienko/Leaflet.curve
 // Definitions by: Onikiienko <https://github.com/onikiienko>
+//                 Andrea <https://github.com/AndreaCimini>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-// TypeScript Version: 2.3
+// TypeScript Version: 3.0
 
 import * as L from 'leaflet';
 
 declare module 'leaflet' {
-	/**
-	 * Drawing Bezier curves and other complex shapes.
-	 */
-	function curve(path: any[], options?: PathOptions): Path;
+    class Curve extends Path {
+        /*
+        * Return path
+        */
+        getPath(): Array<string | Array<[]>>;
+        /*
+        * Set path
+        */
+        setPath(): Curve;
+        /*
+        * Get bounds
+        */
+        getBounds(): LatLngBounds;
+        /*
+        * Get center
+        */
+        getCenter(): LatLng;
+    }
+    /*
+     * Drawing Bezier curves and other complex shapes.
+     */
+    function curve(path: any[], options?: PathOptions): Curve;
 }