Require Node.js 8 and update dependencies

.travis.yml

@@ -3,6 +3,6 @@ os:
   - windows
 language: node_js
 node_js:
+  - '12'
   - '10'
   - '8'
-  - '6'

index.js

@@ -3,23 +3,24 @@ const execBuffer = require('exec-buffer');
 const isPng = require('is-png');
 const optipng = require('optipng-bin');
 
-module.exports = options => input => {
-	options = Object.assign({
+module.exports = options => async buffer => {
+	options = {
 		optimizationLevel: 3,
 		bitDepthReduction: true,
 		colorTypeReduction: true,
-		paletteReduction: true
-	}, options);
+		paletteReduction: true,
+		...options
+	};
 
-	if (!Buffer.isBuffer(input)) {
-		return Promise.reject(new TypeError('Expected a buffer'));
+	if (!Buffer.isBuffer(buffer)) {
+		throw new TypeError('Expected a buffer');
 	}
 
-	if (!isPng(input)) {
-		return Promise.resolve(input);
+	if (!isPng(buffer)) {
+		return buffer;
 	}
 
-	const args = [
+	const arguments_ = [
 		'-strip',
 		'all',
 		'-clobber',
@@ -31,25 +32,22 @@ module.exports = options => input => {
 	];
 
 	if (!options.bitDepthReduction) {
-		args.push('-nb');
+		arguments_.push('-nb');
 	}
 
 	if (!options.colorTypeReduction) {
-		args.push('-nc');
+		arguments_.push('-nc');
 	}
 
 	if (!options.paletteReduction) {
-		args.push('-np');
+		arguments_.push('-np');
 	}
 
-	args.push(execBuffer.input);
+	arguments_.push(execBuffer.input);
 
 	return execBuffer({
-		input,
+		input: buffer,
 		bin: optipng,
-		args
-	}).catch(error => {
-		error.message = error.stderr || error.message;
-		throw error;
+		args: arguments_
 	});
 };

package.json

@@ -5,7 +5,7 @@
 	"license": "MIT",
 	"repository": "imagemin/imagemin-optipng",
 	"engines": {
-		"node": ">=6"
+		"node": ">=8"
 	},
 	"scripts": {
 		"test": "xo && ava"
@@ -17,19 +17,18 @@
 		"imageminplugin",
 		"compress",
 		"image",
-		"img",
 		"minify",
 		"optimize",
 		"optipng",
 		"png"
 	],
 	"dependencies": {
 		"exec-buffer": "^3.0.0",
-		"is-png": "^1.0.0",
-		"optipng-bin": "^5.0.0"
+		"is-png": "^2.0.0",
+		"optipng-bin": "^6.0.0"
 	},
 	"devDependencies": {
-		"ava": "^1.0.1",
-		"xo": "^0.23.0"
+		"ava": "^1.4.1",
+		"xo": "^0.24.0"
 	}
 }

readme.md

@@ -16,21 +16,27 @@ $ npm install imagemin-optipng
 const imagemin = require('imagemin');
 const imageminOptipng = require('imagemin-optipng');
 
-imagemin(['images/*.png'], 'build/images', {use: [imageminOptipng()]}).then(() => {
-	console.log('Images optimized');
-});
+(async () => {
+	await imagemin(['images/*.png'], 'build/images', {
+		use: [
+			imageminOptipng()
+		]
+	});
+
+	console.log('Images optimized!');
+})();
 ```
 
 
 ## API
 
 ### imageminOptipng([options])(buffer)
 
-Returns a `Promise` for a `Buffer`.
+Returns a `Promise<Buffer>`.
 
 #### options
 
-Type: `Object`
+Type: `object`
 
 ##### optimizationLevel
 
@@ -77,8 +83,3 @@ Apply palette reduction.
 Type: `Buffer`
 
 Buffer to optimize.
-
-
-## License
-
-MIT © [imagemin](https://github.com/imagemin)