use gulp-eslint

gulpfile.js

@@ -1,33 +1,36 @@
 'use strict';
 
-var stylish = require('jshint-stylish');
-var istanbul = require('gulp-istanbul');
-var jshint = require('gulp-jshint');
-var mocha = require('gulp-mocha');
 var gulp = require('gulp');
-
-var lint = ['index.js', 'lib/*.js'];
-
-gulp.task('lint', function() {
-  return gulp.src(lint)
-    .pipe(jshint())
-    .pipe(jshint.reporter(stylish));
-});
+var mocha = require('gulp-mocha');
+var istanbul = require('gulp-istanbul');
+var eslint = require('gulp-eslint');
+var unused = require('gulp-unused');
 
 gulp.task('coverage', function() {
-  return gulp.src(lint)
-    .pipe(istanbul())
+  return gulp.src(['index.js', 'lib/**/*.js'])
+    .pipe(istanbul({includeUntested: true}))
     .pipe(istanbul.hookRequire());
 });
 
-gulp.task('test', ['coverage'], function() {
+gulp.task('mocha', ['coverage'], function() {
   return gulp.src('test/*.js')
     .pipe(mocha({reporter: 'spec'}))
     .pipe(istanbul.writeReports())
     .pipe(istanbul.writeReports({
       reporters: [ 'text', 'text-summary' ],
       reportOpts: {dir: 'coverage', file: 'summary.txt'}
-    }))
+    }));
+});
+
+gulp.task('eslint', function() {
+  return gulp.src(['*.js', 'lib/**/*.js', 'test/*.js'])
+    .pipe(eslint());
+});
+
+gulp.task('unused', function() {
+  var utils = require('./lib/utils');
+  return gulp.src(['index.js', 'lib/**/*.js'])
+    .pipe(unused({keys: Object.keys(utils)}));
 });
 
-gulp.task('default', ['lint', 'test']);
+gulp.task('default', ['mocha', 'eslint']);