理想中的 metask 构建方式

metasks.js

var metask = require('metask')

var stylus = metask('stylus')
var autoprefixer = metask('autoprefixer')
var cleancss = metask('cleancss')

var coffee = metask('coffee')
var uglifyjs = metask('uglifyjs')

var jade = metask('jade')

var browserSync = metask('browser-sync')

exports = module.exports = function () {
  browserSync('start', {
    root: 'dist',
    server: true
  })()
  watch('**', exports.build)
}

exports.build = function () {
  return exports.css()
    .then(exports.js)
    .then(exports.html)
}

exports.css = function () {
  return metask.read('src/style.styl')
    .then(stylus())
    .then(autoprefixer())
    .then(cleancss())
    .then(metask.write('dist/style.css'))
}

exports.js = function () {
  return metask.read('src/app.coffee')
    .then(coffee({ bare: true }))
    .then(uglifyjs({ compress: true }))
    .then(metask.write('dist/app.js'))
}

exports.html = function () {
  return metask.read('src/index.jade')
    .then(jade())
    .then(metask.write('dist/index.html'))
}