Inline valid extensions to check for

src/module-cache.coffee

@@ -3,11 +3,6 @@ path = require 'path'
 fs = require 'fs-plus'
 semver = require 'semver'
 
-# Make sure CoffeeScript is required when this file is required directly
-# by apm
-unless require.extensions['.coffee']
-  require('coffee-script').register()
-
 nativeModules = process.binding('natives')
 
 cache =
@@ -58,7 +53,7 @@ loadFolderCompatibility = (modulePath, rootPath, rootMetadata, moduleCache) ->
   onDirectory = (childPath) ->
     path.basename(childPath) isnt 'node_modules'
 
-  extensions = Object.keys(require.extensions)
+  extensions = ['.js', '.coffee', '.json', '.node']
   paths = {}
   onFile = (childPath) ->
     if path.extname(childPath) in extensions