A promise plugin for choo, which I made before I found out that barracks-promisify-plugin already existed.

choo-promise.js

var isPromise = require('is-promise')
var pify = require('pify')

module.exports = function (opts) {
  opts = opts || {}
  function wrapEffects (fn) {
    return function (data, state, send, done) {
      send = pify(send, opts.Promise)
      var promise = fn(data, state, send, done)
      if (isPromise(promise)) promise.then(function (res) { done(null, res) }, done)
    }
  }

  function wrapSubscriptions (fn) {
    return function (send, done) {
      send = pify(send, opts.Promise)
      var promise = fn(send, done)
      if (isPromise(promise)) promise.then(function (res) { done(null, res) }, done)
    }
  }

  return {
    wrapEffects: wrapEffects,
    wrapSubscriptions: wrapSubscriptions
  }
}