diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..936e5c5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/node_modules/
+/package-lock.json
diff --git a/buffer.js b/buffer.js
index f14fd15..f5cb8f4 100644
--- a/buffer.js
+++ b/buffer.js
@@ -28,14 +28,17 @@
  END_NODE_INCLUDE
  */
 
+
+
+ 
 /**
  * @type {Object.<string,*>}
  */
 var buffer = {};
 
 /**
- * @param {...*} var_args
  * @constructor
+ * @param {...*} var_args
  * @nosideeffects
  */
 buffer.Buffer = function(var_args) {};
diff --git a/contrib/mime.js b/contrib/mime.js
new file mode 100644
index 0000000..3b6f645
--- /dev/null
+++ b/contrib/mime.js
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for the mime module. 
+ * @see https://www.npmjs.com/package/mime
+ * @see https://github.com/broofa/node-mime
+ * @externs
+ * @author Jay Shepherd <zysennz@gmail.com>
+ */
+
+/**
+ BEGIN_NODE_INCLUDE
+ var mime = require('mime');
+ END_NODE_INCLUDE
+ */
+
+
+var mime = {R_OK: {}};
+
+/**
+ * Define mimetype -> xtension mappings.  Each key is a mime-type that maps
+ * to an array of extensions associated with the type.  The first extension is
+ * used as the default extension for the type.
+ *
+ * e.g. mime.define({'audio/ogg', ['oga', 'ogg', 'spx']});
+ *
+ * If a type declares an extension that has already been defined, an error will
+ * be thrown.  To suppress this error and force the extension to be associated
+ * with the new type, pass `force`=true.  Alternatively, you may prefix the
+ * extension with "*" to map the type to extension, without mapping the
+ * extension to the type.
+ *
+ * e.g. mime.define({'audio/wav', ['wav']}, {'audio/x-wav', ['*wav']});
+ *
+ *
+ * @param typeMap (Object) type definitions
+ * @param force (Boolean) if true, force overriding of existing definitions
+ */
+mime.define = function(typeMap, force) {};
+
+/**
+ * Lookup a mime type based on extension
+ */
+mime.getType = function(path) {};
+
+/**
+ * Return file extension associated with a mime type
+ */
+mime.getExtension = function(type) {};
\ No newline at end of file
diff --git a/core.js b/core.js
index fbc2f12..4fb5a0e 100644
--- a/core.js
+++ b/core.js
@@ -103,7 +103,3 @@ module.children;
  */
 var global = {};
 
-/**
- * @type {buffer.Buffer}
- */
-var Buffer;
diff --git a/fs.js b/fs.js
index 85ec1df..daba731 100644
--- a/fs.js
+++ b/fs.js
@@ -30,6 +30,16 @@
 
 var fs = {};
 
+
+
+/** @enum {number} */
+fs.constants = {};
+
+/**
+ * @type {number}
+ */
+fs.constants.R_OK;
+
 /**
  * @param {string} oldPath
  * @param {string} newPath
diff --git a/package.json b/package.json
index 75e0bb5..91d6e24 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,10 @@
     "author": "Daniel Wirtz <dcode@dcode.io>",
     "description": "A collection of node.js externs for use with ClosureCompiler.js.",
     "contributors": [
-        { "name": "Daniel Wirtz", "email": "dcode@dcode.io" }
+        {
+            "name": "Daniel Wirtz",
+            "email": "dcode@dcode.io"
+        }
     ],
     "repository": {
         "type": "git",
diff --git a/redundant/stdio.js b/redundant/stdio.js
index 00888ec..b96ade1 100644
--- a/redundant/stdio.js
+++ b/redundant/stdio.js
@@ -22,7 +22,7 @@
  */
 
 /**
- * @type {Object.<string,function(*, ...[*])>}
+ * @type {Object.<string,function(*, ...)>}
  */
 var console = {};
 
diff --git a/redundant/timers.js b/redundant/timers.js
index 576ccb5..16b8ebc 100644
--- a/redundant/timers.js
+++ b/redundant/timers.js
@@ -23,7 +23,7 @@
  */
 
 /**
- * @param {function(...[*])} callback
+ * @param {function(...)} callback
  * @param {number} delay
  * @param {...*} var_args
  * @return {*}
@@ -36,7 +36,7 @@ function setTimeout(callback, delay, var_args) {};
 function clearTimeout(timeoutId) {};
 
 /**
- * @param {function(...[*])} callback
+ * @param {function(...)} callback
  * @param {number} delay
  * @param {...*} var_args
  * @return {*}
diff --git a/tests/validate.js b/tests/validate.js
index 5410455..e3fc9a9 100644
--- a/tests/validate.js
+++ b/tests/validate.js
@@ -29,18 +29,21 @@ for (var i=0; i<files.length; i++) {
         externs.push("./"+files[i]);
     }
 }
-/* files = fs.readdirSync("./contrib");
+/*
+files = fs.readdirSync("./contrib");
 for (i=0; i<files.length; i++) {
     if (pattern.test(files[i])) {
         externs.push("./contrib/"+files[i]);
     }
-} */
+}
+*/
 
 console.log("Validating "+externs.length+" files:\n", externs);
 ClosureCompiler.compile("./tests/noop.js", {
-	"compilation_level": "ADVANCED_OPTIMIZATIONS",
-	"warning_level": "verbose",
-	"externs": externs
+    "compilation_level": "ADVANCED_OPTIMIZATIONS",
+    "warning_level": "verbose",
+    "env": "CUSTOM",
+    "externs": externs
 }, function(error, result) {
     if (error) {
         throw(error);