ES2015ify and require Node.js 4

.gitattributes

@@ -1 +1,2 @@
 * text=auto
+*.js text eol=lf

.travis.yml

@@ -2,5 +2,3 @@ language: node_js
 node_js:
   - '6'
   - '4'
-  - '0.12'
-  - '0.10'

index.js

@@ -1,20 +1,18 @@
 'use strict';
-var stripAnsi = require('strip-ansi');
-var codePointAt = require('code-point-at');
-var isFullwidthCodePoint = require('is-fullwidth-code-point');
+const stripAnsi = require('strip-ansi');
+const isFullwidthCodePoint = require('is-fullwidth-code-point');
 
-// https://github.com/nodejs/io.js/blob/cff7300a578be1b10001f2d967aaedc88aee6402/lib/readline.js#L1345
-module.exports = function (str) {
+module.exports = str => {
 	if (typeof str !== 'string' || str.length === 0) {
 		return 0;
 	}
 
-	var width = 0;
+	let width = 0;
 
 	str = stripAnsi(str);
 
-	for (var i = 0; i < str.length; i++) {
-		var code = codePointAt(str, i);
+	for (let i = 0; i < str.length; i++) {
+		const code = str.codePointAt(i);
 
 		// ignore control characters
 		if (code <= 0x1f || (code >= 0x7f && code <= 0x9f)) {

package.json

@@ -10,7 +10,7 @@
     "url": "sindresorhus.com"
   },
   "engines": {
-    "node": ">=0.10.0"
+    "node": ">=4"
   },
   "scripts": {
     "test": "xo && ava"
@@ -45,12 +45,14 @@
     "fixed-width"
   ],
   "dependencies": {
-    "code-point-at": "^1.0.0",
-    "is-fullwidth-code-point": "^1.0.0",
+    "is-fullwidth-code-point": "^2.0.0",
     "strip-ansi": "^3.0.0"
   },
   "devDependencies": {
     "ava": "*",
     "xo": "*"
+  },
+  "xo": {
+    "esnext": true
   }
 }