Validate files with ESLint.

ESLint is a tool for identifying and reporting on patterns found in ECMAScript/JavaScript code. In many ways, it is similar to JSLint and JSHint with a few exceptions:

• ESLint uses Esprima for JavaScript parsing.
• ESLint uses an AST to evaluate patterns in code.
• ESLint is completely pluggable, every single rule is a plugin and you can add more at runtime.

If you haven't used grunt before, be sure to check out the Getting Started guide, as it explains how to create a gruntfile as well as install and use grunt plugins. Once you're familiar with that process, install this plugin with this command:

npm install --save-dev grunt-eslint

Once the plugin has been installed, it may be enabled inside your Gruntfile with this line of JavaScript:

grunt.loadNpmTasks('grunt-eslint');

See the grunt docs on how to configure tasks and more advanced usage.

grunt.initConfig({
	eslint: {					// task
		target: ['file.js']		// array of files
	}
});

grunt.loadNpmTasks('grunt-eslint');
grunt.registerTask('default', ['eslint']);

grunt.initConfig({
	eslint: {								// task
		options: {
			config: 'conf/eslint.json',		// custom config
			rulesdir: 'conf/rules'			// custom rules
		},
		target: ['file.js']					// array of files
	}
});

grunt.loadNpmTasks('grunt-eslint');
grunt.registerTask('default', ['eslint']);

grunt.initConfig({
	eslint: {								// task
		options: {
			format: require('eslint-tap')
		},
		target: ['file.js']					// array of files
	}
});

grunt.loadNpmTasks('grunt-eslint');
grunt.registerTask('default', ['eslint']);

Type: String
Default: built-in eslint.json

Path to your ESLint config file (eslint.json).

Type: String
Default: built-in rules directory

Path to a directory with custom rules. Your custom rules will be used in addition to the built-in ones.

Recommended read: Working with Rules

Type: String
Default: require('eslint-stylish')

Name of a built-in formatter or path to a custom one.

Some formatters you might find useful: eslint-stylish (see screenshot), eslint-json, eslint-tap.

MIT © Sindre Sorhus