Require Node.js 4

.editorconfig

@@ -7,6 +7,6 @@ charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
 
-[{package.json,*.yml}]
+[*.yml]
 indent_style = space
 indent_size = 2

.gitattributes

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

.travis.yml

@@ -1,7 +1,5 @@
-sudo: false
 language: node_js
 node_js:
+  - '8'
   - '6'
   - '4'
-  - '0.12'
-  - '0.10'

index.js

@@ -1,7 +1,7 @@
 'use strict';
-var isPlainObj = require('is-plain-obj');
+const isPlainObj = require('is-plain-obj');
 
-module.exports = function (obj, opts) {
+module.exports = (obj, opts) => {
 	if (!isPlainObj(obj)) {
 		throw new TypeError('Expected a plain object');
 	}
@@ -10,34 +10,34 @@ module.exports = function (obj, opts) {
 
 	// DEPRECATED
 	if (typeof opts === 'function') {
-		opts = {compare: opts};
+		throw new TypeError('Specify the compare function as an option instead');
 	}
 
-	var deep = opts.deep;
-	var seenInput = [];
-	var seenOutput = [];
+	const deep = opts.deep;
+	const seenInput = [];
+	const seenOutput = [];
 
-	var sortKeys = function (x) {
-		var seenIndex = seenInput.indexOf(x);
+	const sortKeys = x => {
+		const seenIndex = seenInput.indexOf(x);
 
 		if (seenIndex !== -1) {
 			return seenOutput[seenIndex];
 		}
 
-		var ret = {};
-		var keys = Object.keys(x).sort(opts.compare);
+		const ret = {};
+		const keys = Object.keys(x).sort(opts.compare);
 
 		seenInput.push(x);
 		seenOutput.push(ret);
 
-		for (var i = 0; i < keys.length; i++) {
-			var key = keys[i];
-			var val = x[key];
+		for (let i = 0; i < keys.length; i++) {
+			const key = keys[i];
+			const val = x[key];
 
 			if (deep && Array.isArray(val)) {
-				var retArr = [];
+				const retArr = [];
 
-				for (var j = 0; j < val.length; j++) {
+				for (let j = 0; j < val.length; j++) {
 					retArr[j] = isPlainObj(val[j]) ? sortKeys(val[j]) : val[j];
 				}
 

license

@@ -1,21 +1,9 @@
-The MIT License (MIT)
+MIT License
 
 Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
 
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package.json

@@ -1,40 +1,40 @@
 {
-  "name": "sort-keys",
-  "version": "1.1.2",
-  "description": "Sort the keys of an object",
-  "license": "MIT",
-  "repository": "sindresorhus/sort-keys",
-  "author": {
-    "name": "Sindre Sorhus",
-    "email": "sindresorhus@gmail.com",
-    "url": "sindresorhus.com"
-  },
-  "engines": {
-    "node": ">=0.10.0"
-  },
-  "scripts": {
-    "test": "xo && ava"
-  },
-  "files": [
-    "index.js"
-  ],
-  "keywords": [
-    "sort",
-    "object",
-    "keys",
-    "obj",
-    "key",
-    "stable",
-    "deterministic",
-    "deep",
-    "recursive",
-    "recursively"
-  ],
-  "dependencies": {
-    "is-plain-obj": "^1.0.0"
-  },
-  "devDependencies": {
-    "ava": "*",
-    "xo": "*"
-  }
+	"name": "sort-keys",
+	"version": "1.1.2",
+	"description": "Sort the keys of an object",
+	"license": "MIT",
+	"repository": "sindresorhus/sort-keys",
+	"author": {
+		"name": "Sindre Sorhus",
+		"email": "sindresorhus@gmail.com",
+		"url": "sindresorhus.com"
+	},
+	"engines": {
+		"node": ">=4"
+	},
+	"scripts": {
+		"test": "xo && ava"
+	},
+	"files": [
+		"index.js"
+	],
+	"keywords": [
+		"sort",
+		"object",
+		"keys",
+		"obj",
+		"key",
+		"stable",
+		"deterministic",
+		"deep",
+		"recursive",
+		"recursively"
+	],
+	"dependencies": {
+		"is-plain-obj": "^1.0.0"
+	},
+	"devDependencies": {
+		"ava": "*",
+		"xo": "*"
+	}
 }

test.js

@@ -1,15 +1,10 @@
 import test from 'ava';
-import m from './';
+import m from '.';
 
 test('sort the keys of an object', t => {
 	t.deepEqual(m({c: 0, a: 0, b: 0}), {a: 0, b: 0, c: 0});
 });
 
-test('DEPRECATED - sort the keys of an object with a custom sort function', t => {
-	const sortFn = (a, b) => -a.localeCompare(b);
-	t.deepEqual(m({c: 0, a: 0, b: 0}, sortFn), {c: 0, b: 0, a: 0});
-});
-
 test('custom compare function', t => {
 	const compare = (a, b) => a.localeCompare(b);
 	t.deepEqual(m({c: 0, a: 0, b: 0}, {compare}), {c: 0, b: 0, a: 0});