npm i node-proxy

method-missing.coffee

Proxy = require 'node-proxy'

MethodMissing = ->
  property = {}
  handlers =
    get: (rec, key) ->
      return ->
        if property[key]
          property[key]()
        else
          console.log "method #{key} missing"
    set: (rec, key, val) ->
      property[key] = val
  Proxy.createFunction handlers, ->
    property.apply @, arguments

a = new MethodMissing

a.hoge()

missing-fs.coffee

Proxy = require 'node-proxy'

MethodMissing = (obj) ->
  property = obj || {}
  handlers =
    get: (rec, key) ->
      return ->
        if property[key]?
          if Object::toString.call(property[key]) is '[object Function]'
            return property[key].apply null, arguments
          return property[key]
        else
          return "#{key} missing"
    set: (rec, key, val) ->
      property[key] = val
  Proxy.createFunction handlers, ->
    property.apply @, arguments

fs = new MethodMissing require 'fs'

console.log fs.existsSync('.')
console.log fs.existSync('.')