Add typeOfNode Util.

Author: ljharb

src/ReactWrapper.js

@@ -21,6 +21,7 @@ import {
   mapNativeEventNames,
   containsChildrenSubArray,
   propsOfNode,
+  typeOfNode,
 } from './Utils';
 import {
   debugInsts,
@@ -485,10 +486,7 @@ export default class ReactWrapper {
    * @returns {String|Function}
    */
   type() {
-    return this.single((n) => {
-      const node = getNode(n);
-      return node ? node.type : null;
-    });
+    return this.single(n => typeOfNode(getNode(n)));
   }
 
   /**

src/ShallowWrapper.js

@@ -7,6 +7,7 @@ import {
   propFromEvent,
   withSetStateAllowed,
   propsOfNode,
+  typeOfNode,
 } from './Utils';
 import {
   debugNodes,
@@ -464,7 +465,7 @@ export default class ShallowWrapper {
    * @returns {String|Function}
    */
   type() {
-    return this.single(n => n ? n.type : null);
+    return this.single(typeOfNode);
   }
 
   /**

src/Utils.js

@@ -20,6 +20,10 @@ export function propsOfNode(node) {
   return (node && node.props) || {};
 }
 
+export function typeOfNode(node) {
+  return node ? node.type : null;
+}
+
 export function onPrototype(Component, lifecycle, method) {
   const proto = Component.prototype;
   Object.getOwnPropertyNames(proto).forEach((name) => {