Use option for as (#638)

* use option for as

* 6.5.1

Author: bokuweb

package.json

@@ -1,6 +1,6 @@
 {
   "name": "re-resizable",
-  "version": "6.5.0",
+  "version": "6.5.1",
   "description": "Resizable component for React.",
   "title": "re-resizable",
   "main": "./lib/index.es5.js",

src/index.tsx

@@ -77,7 +77,7 @@ export type ResizeStartCallback = (
 ) => void | boolean;
 
 export interface ResizableProps {
-  as: string | React.ComponentType<any>;
+  as?: string | React.ComponentType<any>;
   style?: React.CSSProperties;
   className?: string;
   grid?: [number, number];
@@ -914,7 +914,7 @@ export class Resizable extends React.PureComponent<ResizableProps, State> {
       style.flexBasis = this.state.flexBasis;
     }
 
-    const Wrapper = this.props.as;
+    const Wrapper = this.props.as ?? 'div';
 
     return (
       <Wrapper ref={this.ref} style={style} className={this.props.className} {...extendsProps}>