[BREAKING] upgrade ESLint and get rid of babel-eslint

ESLint now supports ES2017 \o/

This will be a breaking change if you used things like decorators or Flow syntax.

Author: sindresorhus

config/overrides.js

@@ -1,22 +1,4 @@
 'use strict';
 module.exports = {
-	// always use the Babel parser so it won't throw
-	// on esnext features in normal mode
-	parser: 'babel-eslint',
-	plugins: ['babel'],
-	rules: {
-		'generator-star-spacing': 0,
-		'new-cap': 0,
-		'array-bracket-spacing': 0,
-		'object-curly-spacing': 0,
-		'arrow-parens': 0,
-		'babel/generator-star-spacing': [2, 'both'],
-		'babel/new-cap': [2, {
-			newIsCap: true,
-			capIsNew: true
-		}],
-		'babel/array-bracket-spacing': [2, 'never'],
-		'babel/object-curly-spacing': [2, 'never'],
-		'babel/arrow-parens': [2, 'as-needed']
-	}
+	// put rule overrides here
 };

config/plugins.js

@@ -1,5 +1,14 @@
 'use strict';
 module.exports = {
+	// repeated here from eslint-config-xo in case some plugins set something different
+	parserOptions: {
+		ecmaVersion: 2017,
+		sourceType: 'module',
+		ecmaFeatures: {
+			jsx: true,
+			experimentalObjectRestSpread: true
+		}
+	},
 	plugins: [
 		'no-use-extend-native',
 		'ava',

package.json

@@ -62,14 +62,12 @@
   ],
   "dependencies": {
     "arrify": "^1.0.0",
-    "babel-eslint": "^6.0.0",
     "debug": "^2.2.0",
     "deep-assign": "^1.0.0",
-    "eslint": "^3.5.0",
-    "eslint-config-xo": "^0.15.0",
+    "eslint": "^3.6.0",
+    "eslint-config-xo": "^0.16.0",
     "eslint-formatter-pretty": "^1.0.0",
     "eslint-plugin-ava": "^3.0.0",
-    "eslint-plugin-babel": "^3.1.0",
     "eslint-plugin-import": "^1.7.0",
     "eslint-plugin-no-use-extend-native": "^0.3.2",
     "eslint-plugin-promise": "^2.0.1",
@@ -97,6 +95,6 @@
     "nyc": "^8.3.0",
     "proxyquire": "^1.7.3",
     "temp-write": "^2.0.1",
-    "xo": "file:."
+    "xo": "sindresorhus/xo#v0.16.0"
   }
 }

readme.md

@@ -140,7 +140,7 @@ Default: `false`
 
 Enforce ES2015+ rules. Enabling this will *prefer* ES2015+ syntax and conventions.
 
-*ES2015+ is parsed even without this option. You can already use ES2016 features like [`async`/`await`](https://github.com/lukehoban/ecmascript-asyncawait) and [decorators](https://github.com/wycats/javascript-decorators). For a full list of features see [Babel's experimental features](https://babeljs.io/docs/plugins/#stage-x-experimental-presets) and their [Learn ES2015](https://babeljs.io/docs/learn-es2015/).*
+*ES2015+ is parsed even without this option. You can already use ES2017 features like [`async`/`await`](https://github.com/lukehoban/ecmascript-asyncawait).
 
 ### envs
 

test/api.js

@@ -10,8 +10,8 @@ test('.lintText()', t => {
 });
 
 test('.lintText() - `esnext` option', t => {
-	const results = fn.lintText('function dec() {}\nconst x = {\n\t@dec()\n\ta: 1\n};\n', {esnext: true}).results;
-	t.true(hasRule(results, 'no-unused-vars'));
+	const results = fn.lintText('var foo = true;', {esnext: true}).results;
+	t.true(hasRule(results, 'no-var'));
 });
 
 test('.lintText() - JSX support', t => {
@@ -47,7 +47,7 @@ test('.lintText() - extends support with `esnext` option', t => {
 	t.true(hasRule(results, 'react/jsx-no-undef'));
 });
 
-test('always use the Babel parser so esnext syntax won\'t throw in normal mode', t => {
+test('always use the latest ECMAScript parser so esnext syntax won\'t throw in normal mode', t => {
 	const results = fn.lintText('async function foo() {}\n\nfoo();\n').results;
 	t.is(results[0].errorCount, 0);
 });

test/fixtures/extends.js

@@ -1,6 +1,6 @@
 'use strict';
 module.exports = {
 	rules: {
-		'babel/object-curly-spacing': 0
+		'object-curly-spacing': 0
 	}
 };

test/fixtures/project/node_modules/eslint-config-custom/config.json

@@ -68,7 +68,7 @@ test('buildConfig: semicolon', t => {
 });
 
 test('buildConfig: rules', t => {
-	const rules = {'babel/object-curly-spacing': [2, 'always']};
+	const rules = {'object-curly-spacing': [2, 'always']};
 	const config = manager.buildConfig({rules: rules});
 	t.deepEqual(config.rules, rules);
 });