Fix eslint import/no-unresolved in ES6

[MAILPOET-1085]

.eslintrc.es6.json

@@ -10,6 +10,9 @@
       "jsx": true
     }
   },
+  "settings": {
+    "import/resolver": "webpack"
+  },
   "rules": {
     "comma-dangle": ["error", "always-multiline"],
     "import/no-amd": 0,
@@ -43,7 +46,6 @@
     "default-case": 0,
     "array-callback-return": 0,
     "consistent-return": 0,
-    "import/no-unresolved": 0,
     "import/extensions": 0,
     "import/no-extraneous-dependencies": 0,
     "camelcase": 0,

assets/js/src/forms/forms.jsx

@@ -2,7 +2,7 @@ import React from 'react';
 import ReactDOM from 'react-dom';
 import { Router, Route, IndexRoute, useRouterHistory } from 'react-router';
 import { createHashHistory } from 'history';
-import FormList from 'forms/list.jsx';
+import FormList from './list.jsx';
 
 const history = useRouterHistory(createHashHistory)({ queryKey: false });
 

assets/js/src/forms/list.jsx

@@ -1,7 +1,7 @@
 import React from 'react';
-import Listing from 'listing/listing.jsx';
 import classNames from 'classnames';
 import MailPoet from 'mailpoet';
+import Listing from '../listing/listing.jsx';
 
 const columns = [
   {

package.json

@@ -45,6 +45,7 @@
     "cross-env": "^5.0.1",
     "eslint": "^3.19.0",
     "eslint-config-airbnb": "^15.0.1",
+    "eslint-import-resolver-webpack": "^0.8.3",
     "eslint-plugin-import": "^2.3.0",
     "eslint-plugin-jsx-a11y": "^5.0.3",
     "eslint-plugin-react": "^7.1.0",