add XO

https://github.com/sindresorhus/xo

.editorconfig

@@ -7,7 +7,7 @@ charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
 
-[package.json]
+[{package.json,*.yml}]
 indent_style = space
 indent_size = 2
 

.jshintrc

@@ -1,13 +0,0 @@
-{
-	"node": true,
-	"esnext": true,
-	"bitwise": true,
-	"camelcase": true,
-	"curly": true,
-	"immed": true,
-	"newcap": true,
-	"noarg": true,
-	"undef": true,
-	"unused": "vars",
-	"strict": true
-}

benchmark.js

@@ -1,3 +1,5 @@
+/* globals set bench */
+'use strict';
 var chalk = require('./');
 
 suite('chalk', function () {

index.js

@@ -44,7 +44,7 @@ function build(_styles) {
 	builder.enabled = this.enabled;
 	// __proto__ is used because we must return a function, but there is
 	// no way to create a function with a different prototype.
-	/*eslint no-proto: 0 */
+	/* eslint-disable no-proto */
 	builder.__proto__ = proto;
 
 	return builder;

package.json

@@ -13,7 +13,7 @@
     "node": ">=0.10.0"
   },
   "scripts": {
-    "test": "mocha",
+    "test": "xo && mocha",
     "bench": "matcha benchmark.js",
     "coverage": "nyc npm test && nyc report",
     "coveralls": "nyc npm test && nyc report --reporter=text-lcov | coveralls"
@@ -58,6 +58,13 @@
     "nyc": "^3.0.0",
     "require-uncached": "^1.0.2",
     "resolve-from": "^1.0.0",
-    "semver": "^4.3.3"
+    "semver": "^4.3.3",
+    "xo": "*"
+  },
+  "xo": {
+    "envs": [
+      "node",
+      "mocha"
+    ]
   }
 }

test.js

@@ -119,7 +119,6 @@ describe('chalk on windows', function () {
 		var chalkCtx = requireUncached('./');
 		assert.equal(chalkCtx.blue.dim('foo'), '\u001b[94m\u001b[2mfoo\u001b[22m\u001b[39m');
 	});
-
 });
 
 describe('chalk.enabled', function () {