ES2015ify, bump postcss, require Node.js 4

Author: sindresorhus

.gitattributes

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

.travis.yml

@@ -1,4 +1,5 @@
 sudo: false
 language: node_js
 node_js:
-  - 'node'
+  - '6'
+  - '4'

index.js

@@ -1,12 +1,12 @@
 'use strict';
-var gutil = require('gulp-util');
-var through = require('through2');
-var applySourceMap = require('vinyl-sourcemaps-apply');
-var autoprefixer = require('autoprefixer');
-var postcss = require('postcss');
-
-module.exports = function (opts) {
-	return through.obj(function (file, enc, cb) {
+const gutil = require('gulp-util');
+const through = require('through2');
+const applySourceMap = require('vinyl-sourcemaps-apply');
+const autoprefixer = require('autoprefixer');
+const postcss = require('postcss');
+
+module.exports = opts => {
+	return through.obj((file, enc, cb) => {
 		if (file.isNull()) {
 			cb(null, file);
 			return;
@@ -21,28 +21,28 @@ module.exports = function (opts) {
 			map: file.sourceMap ? {annotation: false} : false,
 			from: file.path,
 			to: file.path
-		}).then(function (res) {
-			file.contents = new Buffer(res.css);
+		}).then(res => {
+			file.contents = Buffer.from(res.css);
 
 			if (res.map && file.sourceMap) {
 				applySourceMap(file, res.map.toString());
 			}
 
-			var warnings = res.warnings();
+			const warnings = res.warnings();
 
 			if (warnings.length > 0) {
 				gutil.log('gulp-autoprefixer:', '\n  ' + warnings.join('\n  '));
 			}
 
 			setImmediate(cb, null, file);
-		}).catch(function (err) {
-			var cssError = err.name === 'CssSyntaxError';
+		}).catch(err => {
+			const cssError = err.name === 'CssSyntaxError';
 
 			if (cssError) {
 				err.message += err.showSourceCode();
 			}
 
-			// prevent stream unhandled exception from being suppressed by Promise
+			// Prevent stream unhandled exception from being suppressed by Promise
 			setImmediate(cb, new gutil.PluginError('gulp-autoprefixer', err, {
 				fileName: file.path,
 				showStack: !cssError

package.json

@@ -10,7 +10,7 @@
     "url": "sindresorhus.com"
   },
   "engines": {
-    "node": ">=0.12.0"
+    "node": ">=4"
   },
   "scripts": {
     "test": "xo && mocha"
@@ -32,12 +32,12 @@
   "dependencies": {
     "autoprefixer": "^7.0.0",
     "gulp-util": "^3.0.0",
-    "postcss": "^5.0.4",
+    "postcss": "^6.0.1",
     "through2": "^2.0.0",
     "vinyl-sourcemaps-apply": "^0.2.0"
   },
   "devDependencies": {
-    "gulp-sourcemaps": "^1.1.1",
+    "gulp-sourcemaps": "^2.6.0",
     "mocha": "*",
     "xo": "*"
   }

readme.md

@@ -4,9 +4,11 @@
 
 *Issues with the output should be reported on the Autoprefixer [issue tracker](https://github.com/postcss/autoprefixer/issues).*
 
+
 ---
 
-<p align="center"><b>🔥 Want to strengthen your core JavaScript skills and master ES6?</b><br>I would personally recommend this awesome <a href="https://ES6.io/friend/AWESOME">ES6 course</a> by Wes Bos.</p>
+<p align="center">👾</p>
+<p align="center"><b>Improve your JavaScript skills with this awesome <a href="https://ES6.io/friend/AWESOME">ES6 course</a> by Wes Bos.</b><br>Try his free <a href="https://javascript30.com/friend/AWESOME">JavaScript 30 course</a> for a taste of what to expect. You might also like his <a href="https://ReactForBeginners.com/friend/AWESOME">React</a> & <a href="https://SublimeTextBook.com/friend/AWESOME">Sublime</a> course.</p>
 
 ---
 
@@ -41,12 +43,14 @@ gulp.task('default', () =>
 
 #### options
 
+Type: `Object`
+
 See the Autoprefixer [options](https://github.com/postcss/autoprefixer#options).
 
 
 ## Source Maps
 
-Use [gulp-sourcemaps](https://github.com/floridoo/gulp-sourcemaps) like this:
+Use [gulp-sourcemaps](https://github.com/gulp-sourcemaps/gulp-sourcemaps) like this:
 
 ```js
 const gulp = require('gulp');

test.js

@@ -1,15 +1,15 @@
 /* eslint-env mocha */
 'use strict';
-var path = require('path');
-var assert = require('assert');
-var gutil = require('gulp-util');
-var sourceMaps = require('gulp-sourcemaps');
-var autoprefixer = require('./');
+const path = require('path');
+const assert = require('assert');
+const gutil = require('gulp-util');
+const sourceMaps = require('gulp-sourcemaps');
+const autoprefixer = require('./');
 
-it('should autoprefix CSS', function (cb) {
-	var stream = autoprefixer();
+it('should autoprefix CSS', cb => {
+	const stream = autoprefixer();
 
-	stream.on('data', function (file) {
+	stream.on('data', file => {
 		assert(/-/.test(file.contents.toString()));
 		assert.equal(file.relative, 'fixture.css');
 	});
@@ -20,25 +20,25 @@ it('should autoprefix CSS', function (cb) {
 		cwd: __dirname,
 		base: path.join(__dirname, 'fixture'),
 		path: path.join(__dirname, 'fixture', 'fixture.css'),
-		contents: new Buffer('a {\n\tdisplay: flex;\n}')
+		contents: Buffer.from('a {\n\tdisplay: flex;\n}')
 	}));
 
 	stream.end();
 });
 
-it('should generate source maps', function (cb) {
-	var init = sourceMaps.init();
-	var write = sourceMaps.write();
+it('should generate source maps', cb => {
+	const init = sourceMaps.init();
+	const write = sourceMaps.write();
 
 	init
 		.pipe(autoprefixer({
 			browsers: ['Firefox ESR']
 		}))
 		.pipe(write);
 
-	write.on('data', function (file) {
+	write.on('data', file => {
 		assert.equal(file.sourceMap.mappings, 'AAAA;CACC,cAAc;CACd');
-		var contents = file.contents.toString();
+		const contents = file.contents.toString();
 		assert(/flex/.test(contents));
 		assert(/sourceMappingURL=data:application\/json;charset=utf8;base64/.test(contents));
 		cb();
@@ -48,25 +48,25 @@ it('should generate source maps', function (cb) {
 		cwd: __dirname,
 		base: path.join(__dirname, 'fixture'),
 		path: path.join(__dirname, 'fixture', 'fixture.css'),
-		contents: new Buffer('a {\n\tdisplay: flex;\n}'),
+		contents: Buffer.from('a {\n\tdisplay: flex;\n}'),
 		sourceMap: ''
 	}));
 
 	init.end();
 });
 
-it('should read upstream source maps', function (cb) {
-	var testFile;
-	var stream = autoprefixer();
-	var write = sourceMaps.write();
-	var sourcesContent = [
+it('should read upstream source maps', cb => {
+	let testFile;
+	const stream = autoprefixer();
+	const write = sourceMaps.write();
+	const sourcesContent = [
 		'a {\n  display: flex;\n}\n',
 		'a {\n\tdisplay: flex;\n}\n'
 	];
 
 	stream.pipe(write);
 
-	write.on('data', function (file) {
+	write.on('data', file => {
 		assert.equal(file.sourceMap.sourcesContent[0], sourcesContent[0]);
 		assert.equal(file.sourceMap.sourcesContent[1], sourcesContent[1]);
 		cb();
@@ -77,7 +77,7 @@ it('should read upstream source maps', function (cb) {
 			cwd: __dirname,
 			base: path.join(__dirname, 'fixture'),
 			path: path.join(__dirname, 'fixture', 'fixture.css'),
-			contents: new Buffer('a {\n\tdisplay: flex;\n}\n')
+			contents: Buffer.from('a {\n\tdisplay: flex;\n}\n')
 		}),
 		testFile.sourceMap = {
 			version: 3,