具有多个导出的 Node.js + Coffeescript 类继承？

Question

在 Node.js 和 Coffeescript 中，我定义了一个类 Connector，它继承自 Node 的 EventEmitter。

我想定义Connector 的一个子类，称为Foo。当我尝试定义Foo 的新实例时，我收到：TypeError: Cannot read property 'prototype' of undefined。

我认为这是因为我没有在我的module.exports 中导出Connector 类，但是我怎样才能既导出我的_.tap() 函数，又使Connector 类可用于其他类作为要扩展的父类？

# connectors.coffee
{ EventEmitter } = require 'events'
FS               = require 'fs'
Q                = require 'q'
_                = require 'underscore'
logger           = require './logger'

class Connector extends EventEmitter
  constructor: (@credential) ->

  name : 'Unnamed Connector'
  group: undefined

  search: (query) ->
    @_search(query)
    this

  _results: (results) ->
    @emit 'results', results

  _end: ->
    @emit 'end'

  _error: (error) ->
    @emit 'error', error

  module.exports = _.tap {}, (connectors) ->
    FS.readdirSync("#{__dirname}/connectors").forEach (file) ->
      # some logic


# foo.coffee
Connector = require '../connectors'
logger    = require '../logger'

class Foo extends Connector
  constructor: ->

  name: "test_connector"

  _search: (query) ->
    logger.info "Foo connector queried: #{query}"
    logger.info "Returning fake results, stand by"

module.exports = Foo

Answer 1

可以这样（顺序很重要）：

module.exports = _.tap {}, (connectors) ->
  #
  # your logic here
  #

module.exports.Connector = Connector

#i_use_tap.coffee
tapFunctionResult = require('../connectors')

#foo.coffee
Connector = require('../connectors').Connector
class Foo extends Connector