Проблема с вызовом в coffeescript

Question

Я действительно новичок в Coffeescript/Javascript, и я пишу небольшой пакет для Atom. Я не знаю, почему функция create_dir не видна внутренней функции. Я подозреваю, что есть какая-то проблема обзорного происходит,

{CompositeDisposable, Directory, File} = require 'atom' 

module.exports = ImageAssistant = 
    subscriptions: null 

    activate: (state) -> 
     # Events subscribed to in atom's system can be easily cleaned up 
     # with a CompositeDisposable 
     @subscriptions = new CompositeDisposable 

     # Register command that toggles this view 
     @subscriptions.add atom.workspace.observeTextEditors((editor) -> 
      textEditorElement = atom.views.getView(editor) 

      # on drag and drop event 
      textEditorElement.addEventListener("drop", (e) -> 
       e.preventDefault?() 
       e.stopPropagation?() 

       editor = atom.workspace.getActiveTextEditor() 
       return unless editor 

       dropped_files = e.dataTransfer.files 
       target_file = editor.getPath() 

       fs = require 'fs' 
       path = require 'path' 
       crypto = require "crypto" 

       assets_path = path.join(target_file, "..", "assets") 

       for f in dropped_files 
        if fs.lstatSync(f.path).isFile() 
         buffer = new Buffer(fs.readFileSync(f.path)) 
         md5 = crypto.createHash 'md5' 
         md5.update(buffer) 

         img_filename = "#{path.parse(target_file).name}-#{md5.digest('hex').slice(0,8)}#{path.extname(f.path)}" 
         console.log img_filename 

         assets_dir = new Directory(assets_path) 

         @create_dir assets_dir,()=> 
          fs.writeFile path.join(assets_dir, img_filename), buffer, 'binary',()=> 
           console.log "Copied file over to #{assets_dir}" 
           editor.insertText "![](#{path.join("assets", img_filename)})" 

         return false 
      ) 
     ) 

    create_dir: (dir_path, callback)=> 
     dir_handle = new Directory(dir_path) 

     dir_handle.exists().then (existed) => 
      if not existed 
       dir_handle.create().then (created) => 
        if created 
         console.log "Creation of #{dir_path} successful" 
         callback() 
      else 
       callback() 

    deactivate: -> 
     @subscriptions.dispose() 

Ошибка я получаю:

atom-markdown-image-assistant.coffee:43 Uncaught TypeError: _this.create_dir is not a function(anonymous function) @ atom-markdown-image-assistant.coffee:43 
    /Applications/Atom.app/Contents/Resources/app.asar/node_modules/jquery/dist/jquery.js:8630 GET https://atom.io/api/packages/markdown-image-assistant 404 (Not Found)send @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/jquery/dist/jquery.js:8630jQuery.extend.ajax @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/jquery/dist/jquery.js:8166(anonymous function) @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/notifications/lib/user-utilities.js:258module.exports.getLatestPackageData @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/notifications/lib/user-utilities.js:257module.exports.checkPackageUpToDate @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/notifications/lib/user-utilities.js:271NotificationElement.renderFatalError @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/notifications/lib/notification-elem…:204NotificationElement.render @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/notifications/lib/notification-elem…:159NotificationElement.initialize @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/notifications/lib/notification-elem…:50(anonymous function) @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/notifications/lib/main.js:89module.exports.ViewRegistry.createView @ /Applications/Atom.app/Contents/Resources/app.asar/src/view-registry.js:119module.exports.ViewRegistry.getView @ /Applications/Atom.app/Contents/Resources/app.asar/src/view-registry.js:86Notifications.addNotificationView @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/notifications/lib/main.js:126(anonymous function) @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/notifications/lib/main.js:27module.exports.Emitter.simpleDispatch @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/event-kit/lib/emitter.js:25module.exports.Emitter.emit @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/event-kit/lib/emitter.js:125module.exports.NotificationManager.addNotification @ /Applications/Atom.app/Contents/Resources/app.asar/src/notification-manager.js:54module.exports.NotificationManager.addFatalError @ /Applications/Atom.app/Contents/Resources/app.asar/src/notification-manager.js:45(anonymous function) @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/notifications/lib/main.js:53module.exports.Emitter.simpleDispatch @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/event-kit/lib/emitter.js:25module.exports.Emitter.emit @ /Applications/Atom.app/Contents/Resources/app.asar/node_modules/event-kit/lib/emitter.js:125(anonymous function) @ /Applications/Atom.app/Contents/Resources/app.asar/src/atom-environment.js:837 

Я попытался изменить все -> к =>, как предложено здесь: Multiple Callbacks in CoffeeScript но Didn Исправьте мою проблему, если функция не определена.

Answer 1

Это связано с использованием простого объекта вместо класса, см @ ответ muistooshort здесь: Anonymous function works as callback but defined function does not