Fix crash if a ClassProperty has only one token (fixes #125)

Author: yannickcr

lib/rules/display-name.js

@@ -42,7 +42,10 @@ module.exports = function(context) {
     // (babel-eslint does not expose property name so we have to rely on tokens)
     if (node.type === 'ClassProperty') {
       var tokens = context.getFirstTokens(node, 2);
-      if (tokens[0].value === 'displayName' || tokens[1].value === 'displayName') {
+      if (
+        tokens[0].value === 'displayName' ||
+        (tokens[1] && tokens[1].value === 'displayName')
+      ) {
         return true;
       }
       return false;

lib/rules/prop-types.js

@@ -47,7 +47,10 @@ module.exports = function(context) {
     // (babel-eslint does not expose property name so we have to rely on tokens)
     if (node.type === 'ClassProperty') {
       var tokens = context.getFirstTokens(node, 2);
-      if (tokens[0].value === 'propTypes' || tokens[1].value === 'propTypes') {
+      if (
+        tokens[0].value === 'propTypes' ||
+        (tokens[1] && tokens[1].value === 'propTypes')
+      ) {
         return true;
       }
       return false;

tests/lib/rules/display-name.js

@@ -57,6 +57,17 @@ eslintTester.addRuleTest('lib/rules/display-name', {
       classes: true,
       jsx: true
     }
+  }, {
+    code: [
+      'class Hello {',
+      '  method',
+      '}'
+    ].join('\n'),
+    parser: 'babel-eslint',
+    ecmaFeatures: {
+      classes: true,
+      jsx: true
+    }
   }, {
     code: [
       'class Hello extends React.Component {',

tests/lib/rules/prop-types.js

@@ -167,6 +167,17 @@ eslintTester.addRuleTest('lib/rules/prop-types', {
         classes: true,
         jsx: true
       }
+    }, {
+      code: [
+        'class Hello {',
+        '  method',
+        '}'
+      ].join('\n'),
+      parser: 'babel-eslint',
+      ecmaFeatures: {
+        classes: true,
+        jsx: true
+      }
     }, {
       code: [
         'class Hello extends React.Component {',