Compose Middleware

compose.js

var waterfall = require('async-waterfall')
var flatten = require('lodash.flatten')

module.exports = compose

function compose () {
  var middlewares = flatten(arguments)

  function composed (req, res, next) {
    var callbacks = middlewares.map(function (middleware) {
      return middleware.bind(middleware, req, res)
    })
    waterfall(callbacks, next)
  }

  return composed
}