Add import/no-anonymous-default-export lint rule (facebook#8926)

Author: shakib609

packages/eslint-config-react-app/index.js

@@ -253,6 +253,7 @@ module.exports = {
     // https://github.com/benmosher/eslint-plugin-import/tree/master/docs/rules
     'import/first': 'error',
     'import/no-amd': 'error',
+    'import/no-anonymous-default-export': 'warn',
     'import/no-webpack-loader-syntax': 'error',
 
     // https://github.com/yannickcr/eslint-plugin-react/tree/master/docs/rules

packages/react-scripts/fixtures/kitchensink/template/src/absoluteLoad.js

@@ -5,9 +5,11 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-export default () => [
+const absoluteLoad = () => [
   { id: 1, name: '1' },
   { id: 2, name: '2' },
   { id: 3, name: '3' },
   { id: 4, name: '4' },
 ];
+
+export default absoluteLoad;

packages/react-scripts/fixtures/kitchensink/template/src/features/config/BaseUrl.js

@@ -9,7 +9,7 @@ import React, { Component } from 'react';
 import PropTypes from 'prop-types';
 import load from 'absoluteLoad';
 
-export default class extends Component {
+export default class BaseUrl extends Component {
   static propTypes = {
     onReady: PropTypes.func.isRequired,
   };

packages/react-scripts/fixtures/kitchensink/template/src/features/env/ExpandEnvVariables.js

@@ -7,7 +7,7 @@
 
 import React from 'react';
 
-export default () => (
+const ExpandEnvVariables = () => (
   <span>
     <span id="feature-expand-env-1">{process.env.REACT_APP_BASIC}</span>
     <span id="feature-expand-env-2">{process.env.REACT_APP_BASIC_EXPAND}</span>
@@ -19,3 +19,5 @@ export default () => (
     </span>
   </span>
 );
+
+export default ExpandEnvVariables;

packages/react-scripts/fixtures/kitchensink/template/src/features/env/FileEnvVariables.js

@@ -7,7 +7,7 @@
 
 import React from 'react';
 
-export default () => (
+const FileEnvVariables = () => (
   <span>
     <span id="feature-file-env-original-1">
       {process.env.REACT_APP_ORIGINAL_1}
@@ -22,3 +22,5 @@ export default () => (
     <span id="feature-file-env-x">{process.env.REACT_APP_X}</span>
   </span>
 );
+
+export default FileEnvVariables;

packages/react-scripts/fixtures/kitchensink/template/src/features/env/PublicUrl.js

@@ -7,6 +7,8 @@
 
 import React from 'react';
 
-export default () => (
+const PublicUrl = () => (
   <span id="feature-public-url">{process.env.PUBLIC_URL}.</span>
 );
+
+export default PublicUrl;

packages/react-scripts/fixtures/kitchensink/template/src/features/env/ShellEnvVariables.js

@@ -7,8 +7,10 @@
 
 import React from 'react';
 
-export default () => (
+const ShellEnvVariables = () => (
   <span id="feature-shell-env-variables">
     {process.env.REACT_APP_SHELL_ENV_MESSAGE}.
   </span>
 );
+
+export default ShellEnvVariables;

packages/react-scripts/fixtures/kitchensink/template/src/features/syntax/ArrayDestructuring.js

@@ -17,7 +17,7 @@ function load() {
   ];
 }
 
-export default class extends Component {
+export default class ArrayDestructuring extends Component {
   static propTypes = {
     onReady: PropTypes.func.isRequired,
   };

packages/react-scripts/fixtures/kitchensink/template/src/features/syntax/ArraySpread.js

@@ -17,7 +17,7 @@ function load(users) {
   ];
 }
 
-export default class extends Component {
+export default class ArraySpread extends Component {
   static propTypes = {
     onReady: PropTypes.func.isRequired,
   };

packages/react-scripts/fixtures/kitchensink/template/src/features/syntax/AsyncAwait.js

@@ -27,7 +27,7 @@ const x = async (
 };
 /* eslint-enable */
 
-export default class extends Component {
+export default class AsyncAwait extends Component {
   static propTypes = {
     onReady: PropTypes.func.isRequired,
   };