Upgrade gulp-eslint and require Gulp 4

.travis.yml

@@ -1,5 +1,5 @@
 language: node_js
 node_js:
+  - '12'
   - '10'
   - '8'
-  - '6'

gulpfile.js

@@ -2,7 +2,7 @@
 const gulp = require('gulp');
 const xo = require('.');
 
-gulp.task('default', () =>
+exports.default = () => (
 	gulp.src('_fixture.js')
 		.pipe(xo())
 		.pipe(xo.format())

index.js

@@ -6,37 +6,37 @@ const xo = require('xo');
 const PluginError = require('plugin-error');
 
 module.exports = options => {
-	options = Object.assign({
-		quiet: false
-	}, options);
+	options = {
+		quiet: false,
+		...options
+	};
 
-	return through.obj(function (file, enc, cb) {
+	return through.obj(function (file, encoding, callback) {
 		if (file.isNull()) {
-			cb(null, file);
+			callback(null, file);
 			return;
 		}
 
 		if (file.isStream()) {
-			cb(new PluginError('gulp-xo', 'Streaming not supported'));
+			callback(new PluginError('gulp-xo', 'Streaming not supported'));
 			return;
 		}
 
 		let report;
-
 		try {
 			report = xo.lintText(file.contents.toString(), {
 				cwd: file.cwd,
 				filename: file.path,
 				fix: options.fix
 			});
-		} catch (err) {
-			this.emit('error', new PluginError('gulp-xo', err, {fileName: file.path}));
+		} catch (error) {
+			this.emit('error', new PluginError('gulp-xo', error, {fileName: file.path}));
 		}
 
 		let result = report.results;
 
 		if (result.length === 0) {
-			cb(null, file);
+			callback(null, file);
 			return;
 		}
 
@@ -51,7 +51,7 @@ module.exports = options => {
 			file.eslint.fixed = true;
 		}
 
-		cb(null, file);
+		callback(null, file);
 	});
 };
 

package.json

@@ -10,7 +10,7 @@
 		"url": "sindresorhus.com"
 	},
 	"engines": {
-		"node": ">=6"
+		"node": ">=8"
 	},
 	"scripts": {
 		"test": "ava"
@@ -48,21 +48,24 @@
 	],
 	"dependencies": {
 		"eslint-formatter-pretty": "^2.0.0",
-		"gulp-eslint": "^5.0.0",
+		"gulp-eslint": "^6.0.0",
 		"plugin-error": "^1.0.1",
 		"through2": "^3.0.0",
 		"xo": "^0.24.0"
 	},
 	"devDependencies": {
-		"ava": "^1.1.0",
+		"ava": "^2.3.0",
 		"gulp": "^4.0.0",
-		"p-event": "^2.1.0",
+		"p-event": "^4.1.0",
 		"vinyl": "^2.1.0",
 		"vinyl-file": "^3.0.0"
 	},
+	"peerDependencies": {
+		"gulp": ">=4"
+	},
 	"xo": {
 		"ignores": [
-			"test/fixture/**"
+			"test/_fixture.js"
 		]
 	}
 }

readme.md

@@ -20,7 +20,7 @@ $ npm install --save-dev gulp-xo
 const gulp = require('gulp');
 const xo = require('gulp-xo');
 
-gulp.task('default', () =>
+exports.default = () => (
 	gulp.src('src/app.js')
 		.pipe(xo())
 		.pipe(xo.format())
@@ -31,11 +31,13 @@ gulp.task('default', () =>
 
 ## API
 
-### xo([options])
+### xo(options?)
 
 #### options
 
-##### options.fix
+Type: `object`
+
+##### fix
 
 Type: `boolean`
 
@@ -67,8 +69,3 @@ Report errors only.
 
 - [gulp-eslint](https://github.com/adametry/gulp-eslint) - Gulp plugin for ESLint
 - [gulp-reporter](https://github.com/gucong3000/gulp-reporter) - Error reporter for CSSLint, EditorConfig, ESLint, HTMLHint, PostCSS, TSLint, XO
-
-
-## License
-
-MIT © [Sindre Sorhus](https://sindresorhus.com)