use different eslint config for es6 and es5

packages/react-dom/src/__tests__/ReactDOMComponent-test.js

@@ -443,10 +443,10 @@ describe('ReactDOMComponent', () => {
     });
 
     it('should not set null/undefined attributes', () => {
-      var container = document.createElement('div');
+      const container = document.createElement('div');
       // Initial render.
       ReactDOM.render(<img src={null} data-foo={undefined} />, container);
-      var node = container.firstChild;
+      const node = container.firstChild;
       expect(node.hasAttribute('src')).toBe(false);
       expect(node.hasAttribute('data-foo')).toBe(false);
       // Update in one direction.
@@ -468,9 +468,9 @@ describe('ReactDOMComponent', () => {
     });
 
     it('should apply React-specific aliases to HTML elements', () => {
-      var container = document.createElement('div');
+      const container = document.createElement('div');
       ReactDOM.render(<form acceptCharset="foo" />, container);
-      var node = container.firstChild;
+      const node = container.firstChild;
       // Test attribute initialization.
       expect(node.getAttribute('accept-charset')).toBe('foo');
       expect(node.hasAttribute('acceptCharset')).toBe(false);
@@ -501,9 +501,9 @@ describe('ReactDOMComponent', () => {
     });
 
     it('should apply React-specific aliases to SVG elements', () => {
-      var container = document.createElement('div');
+      const container = document.createElement('div');
       ReactDOM.render(<svg arabicForm="foo" />, container);
-      var node = container.firstChild;
+      const node = container.firstChild;
       // Test attribute initialization.
       expect(node.getAttribute('arabic-form')).toBe('foo');
       expect(node.hasAttribute('arabicForm')).toBe(false);
@@ -543,9 +543,9 @@ describe('ReactDOMComponent', () => {
     });
 
     it('should not apply React-specific aliases to custom elements', () => {
-      var container = document.createElement('div');
+      const container = document.createElement('div');
       ReactDOM.render(<some-custom-element arabicForm="foo" />, container);
-      var node = container.firstChild;
+      const node = container.firstChild;
       // Should not get transformed to arabic-form as SVG would be.
       expect(node.getAttribute('arabicForm')).toBe('foo');
       expect(node.hasAttribute('arabic-form')).toBe(false);

packages/react-dom/src/__tests__/ReactServerRendering-test.js

@@ -376,7 +376,7 @@ describe('ReactDOMServer', () => {
     it('should not focus on either server or client with autofocus={false} even if there is a markup mismatch', () => {
       spyOnDev(console, 'error');
 
-      var element = document.createElement('div');
+      const element = document.createElement('div');
       element.innerHTML = ReactDOMServer.renderToString(
         <button autoFocus={false}>server</button>,
       );

packages/react-dom/src/__tests__/validateDOMNesting-test.js

@@ -9,8 +9,8 @@
 
 'use strict';
 
-var React = require('react');
-var ReactDOM = require('react-dom');
+const React = require('react');
+const ReactDOM = require('react-dom');
 
 function normalizeCodeLocInfo(str) {
   return str && str.replace(/at .+?:\d+/g, 'at **');

packages/react-dom/src/events/forks/EventListener-www.js

@@ -7,7 +7,7 @@
  * @flow
  */
 
-var EventListenerWWW = require('EventListener');
+const EventListenerWWW = require('EventListener');
 
 import typeof * as EventListenerType from '../EventListener';
 import typeof * as EventListenerShimType from './EventListener-www';

scripts/babel/__tests__/transform-prevent-infinite-loops-test.js

@@ -4,6 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  */
+'use strict';
 
 describe('transform-prevent-infinite-loops', () => {
   // Note: instead of testing the transform by applying it,

scripts/babel/transform-object-assign-require.js

@@ -26,14 +26,14 @@ module.exports = function autoImporter(babel) {
       CallExpression: function(path, file) {
         if (path.get('callee').matchesPattern('Object.assign')) {
           // generate identifier and require if it hasn't been already
-          var id = getAssignIdent(path, file, this);
+          const id = getAssignIdent(path, file, this);
           path.node.callee = id;
         }
       },
 
       MemberExpression: function(path, file) {
         if (path.matchesPattern('Object.assign')) {
-          var id = getAssignIdent(path, file, this);
+          const id = getAssignIdent(path, file, this);
           path.replaceWith(id);
         }
       },