use class property of this.state

components/avatar/index.tsx

@@ -37,15 +37,12 @@ export default class Avatar extends React.Component<AvatarProps, AvatarState> {
     size: 'default',
   };
 
-  private avatarChildren: any;
-
-  constructor(props: AvatarProps) {
-    super(props);
-    this.state = {
+  state = {
     scale: 1,
     isImgExist: true,
   };
-  }
+
+  private avatarChildren: any;
 
   componentDidMount() {
     this.setScale();