vis: update network nodes image option (v4.21)

types/vis/index.d.ts

@@ -8,6 +8,7 @@
 //                 Matthieu Maitre <https://github.com/mmaitre314>
 //                 Adam Lewis <https://github.com/supercargo>
 //                 Alex Soh <https://github.com/takato1314>
+//                 Oleksii Kachura <https://github.com/alex-kachura>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 import { MomentInput, MomentFormatSpecification, Moment } from 'moment';
@@ -1691,7 +1692,7 @@ export interface Node {
   x?: number;
   y?: number;
   fixed?: boolean;
-  image?: string;
+  image?: string | Image;
   shape?: string;
   color?: string | Color;
 }
@@ -1760,6 +1761,11 @@ export interface Options {
   physics?: any; // http://visjs.org/docs/network/physics.html#
 }
 
+export interface Image {
+  unselected?: string;
+  selected?: string;
+}
+
 export interface Color {
   border?: string;
 
@@ -1819,7 +1825,7 @@ export interface NodeOptions {
 
   id?: string;
 
-  image?: string;
+  image?: string | Image;
 
   label?: string;