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/usr/lib/coffee-script/src/register.coffee is in coffeescript 1.10.0~dfsg-1.

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CoffeeScript  = require './coffee-script'
child_process = require 'child_process'
helpers       = require './helpers'
path          = require 'path'

# Load and run a CoffeeScript file for Node, stripping any `BOM`s.
loadFile = (module, filename) ->
  answer = CoffeeScript._compileFile filename, false
  module._compile answer, filename

# If the installed version of Node supports `require.extensions`, register
# CoffeeScript as an extension.
if require.extensions
  for ext in CoffeeScript.FILE_EXTENSIONS
    require.extensions[ext] = loadFile

  # Patch Node's module loader to be able to handle multi-dot extensions.
  # This is a horrible thing that should not be required.
  Module = require 'module'

  findExtension = (filename) ->
    extensions = path.basename(filename).split '.'
    # Remove the initial dot from dotfiles.
    extensions.shift() if extensions[0] is ''
    # Start with the longest possible extension and work our way shortwards.
    while extensions.shift()
      curExtension = '.' + extensions.join '.'
      return curExtension if Module._extensions[curExtension]
    '.js'

  Module::load = (filename) ->
    @filename = filename
    @paths = Module._nodeModulePaths path.dirname filename
    extension = findExtension filename
    Module._extensions[extension](this, filename)
    @loaded = true

# If we're on Node, patch `child_process.fork` so that Coffee scripts are able
# to fork both CoffeeScript files, and JavaScript files, directly.
if child_process
  {fork} = child_process
  binary = require.resolve '../../bin/coffee'
  child_process.fork = (path, args, options) ->
    if helpers.isCoffee path
      unless Array.isArray args
        options = args or {}
        args = []
      args = [path].concat args
      path = binary
    fork path, args, options