chore: Avoid render icon if renderFunc return null

Author: zombieJ

src/Select.tsx

@@ -72,9 +72,9 @@ export type SelectProps<ValueType extends DefaultValueType = DefaultValueType> =
  * we have to wrap an class component to handle this.
  */
 class Select<VT> extends React.Component<SelectProps<SelectOptionsType, VT>> {
-  static Option: typeof Option;
+  static Option = Option;
 
-  static OptGroup: typeof OptGroup;
+  static OptGroup = OptGroup;
 
   selectRef = React.createRef<RefSelectProps>();
 

src/interface/index.ts

@@ -1,7 +1,7 @@
 import * as React from 'react';
 import { Key } from './generator';
 
-export type RenderNode = React.ReactNode | (() => React.ReactNode);
+export type RenderNode = React.ReactNode | ((props: any) => React.ReactNode);
 
 export type Mode = 'multiple' | 'tags' | 'combobox';