gulp 3.7 リリース: CoffeeScriptネイティブに ref: http://qiita.com/cognitom/items/4468723674199cf5f9a5

file0.txt

{
  <略>
  "devDependencies": {
    "coffee-script": "*",
  }
}

file1.coffee

gulp         = require 'gulp'
autoprefixer = require 'gulp-autoprefixer'
minifyCss    = require 'gulp-minify-css'
rename       = require 'gulp-rename'

gulp.task 'css', ->
  gulp.src            './css/styles.css'
  .pipe autoprefixer  'last 2 versions'
  .pipe minifyCss     keepSpecialComments: 0
  .pipe rename        extname: '.min.css'
  .pipe gulp.dest     './css/'

file2.txt

{
  '.co': 'coco',
  '.coffee': 'coffee-script/register',
  '.iced': 'iced-coffee-script/register',
  '.js': null,
  '.litcoffee': 'coffee-script/register',
  '.ls': 'livescript'
}