add XO

Author: sindresorhus

.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

@@ -5,11 +5,11 @@ var isStream = module.exports = function (stream) {
 };
 
 isStream.writable = function (stream) {
-	return isStream(stream) && stream.writable !== false && typeof stream._write == 'function' && typeof stream._writableState == 'object';
+	return isStream(stream) && stream.writable !== false && typeof stream._write === 'function' && typeof stream._writableState === 'object';
 };
 
 isStream.readable = function (stream) {
-	return isStream(stream) && stream.readable !== false && typeof stream._read == 'function' && typeof stream._readableState == 'object';
+	return isStream(stream) && stream.readable !== false && typeof stream._read === 'function' && typeof stream._readableState === 'object';
 };
 
 isStream.duplex = function (stream) {

index.js

@@ -13,7 +13,7 @@
     "node": ">=0.10.0"
   },
   "scripts": {
-    "test": "node test.js"
+    "test": "xo && node test.js"
   },
   "files": [
     "index.js"
@@ -31,6 +31,7 @@
   ],
   "devDependencies": {
     "ava": "0.0.4",
-    "tempfile": "^1.1.0"
+    "tempfile": "^1.1.0",
+    "xo": "*"
   }
 }