Merge pull request #374 from lukekarrys/373-jsx-key-crash

Fix crash in jsx-key (fixes #373)

Author: yannickcr

lib/rules/jsx-key.js

@@ -46,23 +46,24 @@ module.exports = function(context) {
 
     // Array.prototype.map
     CallExpression: function (node) {
-      if (node.callee.property.name !== 'map') {
+      if (node.callee && node.callee.property && node.callee.property.name !== 'map') {
         return;
       }
 
       var fn = node.arguments[0];
-      var isFn = fn.type === 'FunctionExpression';
-      var isArrFn = fn.type === 'ArrowFunctionExpression';
+      var isFn = fn && fn.type === 'FunctionExpression';
+      var isArrFn = fn && fn.type === 'ArrowFunctionExpression';
 
       if (isArrFn && fn.body.type === 'JSXElement') {
         checkIteratorElement(fn.body);
       }
 
       if (isFn || isArrFn) {
         if (fn.body.type === 'BlockStatement') {
-          checkIteratorElement(
-            getReturnStatement(fn.body.body).argument
-          );
+          var returnStatement = getReturnStatement(fn.body.body);
+          if (returnStatement) {
+            checkIteratorElement(returnStatement.argument);
+          }
         }
       }
     }

tests/lib/rules/jsx-key.js

@@ -25,6 +25,8 @@ var parserOptions = {
 var ruleTester = new RuleTester();
 ruleTester.run('jsx-key', rule, {
   valid: [
+    {code: 'fn()', parserOptions: parserOptions},
+    {code: '[1, 2, 3].map(function () {})', parserOptions: parserOptions},
     {code: '<App />;', parserOptions: parserOptions},
     {code: '[<App key={0} />, <App key={1} />];', parserOptions: parserOptions},
     {code: '[1, 2, 3].map(function(x) { return <App key={x} /> });', parserOptions: parserOptions},