fix: resovle build error

packages/mobile/src/interface/graph.ts

@@ -123,30 +123,3 @@ export interface ITreeGraph extends IGraph {
    */
   isLayoutAnimating: () => boolean;
 }
-
-export class G6GraphEvent extends GraphEvent implements IG6GraphEvent {
-  public item: Item;
-
-  public canvasX: number;
-
-  public canvasY: number;
-
-  public clientX: number;
-
-  public clientY: number;
-
-  public wheelDelta: number;
-
-  public detail: number;
-
-  public target!: IShapeBase & ICanvas;
-
-  constructor(type: string, event: IG6GraphEvent) {
-    super(type, event);
-    this.item = event.item;
-    this.canvasX = event.canvasX;
-    this.canvasY = event.canvasY;
-    this.wheelDelta = event.wheelDelta;
-    this.detail = event.detail;
-  }
-}

packages/mobile/src/stories/Basic.tsx

@@ -1,6 +1,4 @@
 import React, { useEffect } from 'react';
-import ReactDOM from 'react-dom';
-import PropTypes from 'prop-types';
 import G6 from '../../src';
 import GridLayout from '../extends/layout/gridLayout';
 import './basic.css';
@@ -36,7 +34,7 @@ export const BasicDemo = () => {
   useEffect(() => {
     if (!graph) {
       graph = new G6.Graph({
-        container: ReactDOM.findDOMNode(ref.current),
+        container: ref.current,
         width: 500,
         height: 500,
         layout: {

packages/mobile/src/stories/index.stories.tsx

@@ -1,15 +1,14 @@
 import React from 'react';
 // also exported from '@storybook/react' if you can deal with breaking changes in 6.1
-import { Story, Meta } from '@storybook/react/types-6-0';
 
 import { BasicDemo, BasicProps } from './Basic';
 
 export default {
   title: 'Example/basic-demo',
   component: BasicDemo,
-} as Meta;
+};
 
-const Template: Story<BasicProps> = (args) => <BasicDemo {...args} />;
+const Template = (args) => <BasicDemo {...args} />;
 
 export const MobileBasicDemo = Template.bind({});
 MobileBasicDemo.args = {};