Lint your CoffeeScript using gulp and CoffeeLint


CoffeeLint plugin for gulp 3.

First, install gulp-coffeelint as a development dependency:

npm install --save-dev gulp-coffeelint

Then, add it to your gulpfile.js:

var gulp = require('gulp');
var coffeelint = require('gulp-coffeelint');
gulp.task('lint', function () {

All arguments are optional. By default gulp-coffeelint will walk up the directory tree looking for a coffeelint.json (per file, i.e. dirname) or a package.json that has a coffeelintConfig object (as the cli does). Also, .litcoffee and files will be treated as Literate CoffeeScript.

Type: String

Absolute path of a json file containing options for coffeelint.

Type: Object

Options you wish to send to coffeelint. If optFile is given, this will be ignored.

Type: Boolean

Are we dealing with Literate CoffeeScript?

Type: Array[Function] Default: []

Add custom rules to coffeelint.

Adds the following properties to the file object:

file.coffeelint.success = true; // if no errors were found, false otherwise 
file.coffeelint.errorCount = 0; // number of errors returned by `coffeelint` 
file.coffeelint.warningCount = 0; // number of warnings returned by `coffeelint` 
file.coffeelint.results = ErrorReport Object; // instance of `Coffeelint::ErrorReport` , see 
file.coffeelint.opt = {}; // the options used by `coffeelint` 
file.coffeelint.literate = false; // you guessed it 

Type: String, Function Default: 'coffeelint-stylish'

You can choose any CoffeeLint reporter when you call


Let's use coffeelint-stylish as an example. External modules can be referenced either as the reporter's constructor function or as its module name.

var stylish = require('coffeelint-stylish');

-- OR --


Any module following the CoffeeLint Reporter module format should work. These modules have a constructor accepting a CoffeeLint::ErrorReport Object, and provide a publish function.

Do you want the task to fail when a CoffeeLint error or warning happens? gulp-coffeelint includes fail and failOnWarning reporters for this.

This example will log the errors using the stylish reporter, then fail if CoffeeLint was not a success.


Specify your own downstream Reporter for CoffeeLint results.

var coffeelint = require('gulp-coffeelint');
var myReporter = (function() {
  function MyReporter(errorReport) {
    this.errorReport = errorReport;
  MyReporter.prototype.publish = function() {
    var hasError = this.errorReport.hasError();
    if (hasError) {
      return console.log('Oh no!');
    return console.log('Oh yeah!');
  return MyReporter;
gulp.task('lint', function() {
  return gulp.src('./src/*.coffee')

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using gulp and npm-test. Plus, make sure to adhere to these commit message conventions.

MIT License © Jan Raasch