feat: 兼容 ts错误

Author: zhanbo

packages/x-flow/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@xrenders/xflow",
-  "version": "1.0.0-beta.5",
+  "version": "1.0.0-beta.6",
   "description": "一款功能强大、易用灵活的流程编辑器框架，帮助你轻松构建复杂的工作流和流程产品",
   "keywords": [
     "xflow"

packages/x-flow/src/utils/hooks.ts

@@ -2,7 +2,7 @@ import { useReducer, useRef, useEffect, useState } from 'react';
 import { message } from 'antd';
 
 export function usePrevious(value: any) {
-  const ref = useRef();
+  const ref = useRef(null);
   useEffect(() => {
     ref.current = value;
   }, [value]);