fix: watch ts (#427)

Author: crazyair

src/useWatch.ts

@@ -6,7 +6,8 @@ import type { InternalFormInstance, NamePath, Store } from './interface';
 import { useState, useContext, useEffect, useRef } from 'react';
 import { getNamePath, getValue } from './utils/valueUtil';
 
-type GetGeneric<Type> = Type extends FormInstance<infer ValueType> ? ValueType : never;
+type ReturnPromise<T> = T extends Promise<infer ValueType> ? ValueType : never;
+type GetGeneric<TForm extends FormInstance> = ReturnPromise<ReturnType<TForm['validateFields']>>;
 
 function useWatch<
   TDependencies1 extends keyof GetGeneric<TForm>,