perf(useAsyncEffect): move isAsyncGenerator outside the hook (#2186)

Author: bijinfeng

packages/hooks/src/useAsyncEffect/index.ts

@@ -2,15 +2,16 @@ import type { DependencyList } from 'react';
 import { useEffect } from 'react';
 import { isFunction } from '../utils';
 
+function isAsyncGenerator(
+  val: AsyncGenerator<void, void, void> | Promise<void>,
+): val is AsyncGenerator<void, void, void> {
+  return isFunction(val[Symbol.asyncIterator]);
+}
+
 function useAsyncEffect(
   effect: () => AsyncGenerator<void, void, void> | Promise<void>,
   deps?: DependencyList,
 ) {
-  function isAsyncGenerator(
-    val: AsyncGenerator<void, void, void> | Promise<void>,
-  ): val is AsyncGenerator<void, void, void> {
-    return isFunction(val[Symbol.asyncIterator]);
-  }
   useEffect(() => {
     const e = effect();
     let cancelled = false;