diff --git a/Makefile b/Makefile
index 9b0da39..3415965 100644
--- a/Makefile
+++ b/Makefile
@@ -58,13 +58,16 @@ perf-%.js: default
 
 # minificatino process uses Google Closure compiler
 min: build/ease.min.js build/ease-full.min.js $(path_build)/browser-test-min.html \
-	| combine
+	$(path_tools)/externs-global.js | combine
 $(compiler):
 	wget -O- http://closure-compiler.googlecode.com/files/compiler-latest.tar.gz \
 		| tar -C $(path_tools) -xzv compiler.jar
 build/%.min.js: build/%.js $(compiler)
 	cat $(path_tools)/license.tpl > $@
-	java -jar $(compiler) --js $< >> $@ || rm $@
+	java -jar $(compiler) \
+		--warning_level VERBOSE \
+		--externs $(path_tools)/externs-global.js \
+		--js $< >> $@ || rm $@
 
 install: doc-info
 	[ -d $(path_info_install) ] || mkdir -p $(path_info_install)
diff --git a/lib/ClassBuilder.js b/lib/ClassBuilder.js
index 73f545c..019a3a5 100644
--- a/lib/ClassBuilder.js
+++ b/lib/ClassBuilder.js
@@ -64,7 +64,7 @@ var util    = require( __dirname + '/util' ),
      * is performed only for methods. This is for performance reasons. We do not
      * have a situation where we will want to check for properties as well.
      *
-     * @type {Object.<string,boolean}
+     * @type {Object.<string,boolean>}
      */
     public_methods = {
         '__construct': true,
@@ -296,7 +296,7 @@ exports.prototype.build = function extend()
         static_members = {
             methods: this._memberBuilder.initMembers(),
             props:   this._memberBuilder.initMembers(),
-        }
+        },
 
         abstract_methods =
             util.clone( exports.getMeta( base ).abstractMethods )
@@ -438,10 +438,7 @@ exports.prototype.buildMembers = function buildMembers(
             // disallow use of our internal __initProps() method
             if ( reserved_members[ name ] === true )
             {
-                throw Error(
-                    ( ( cname ) ? cname + '::' : '' ) +
-                    ( name + " is reserved" )
-                );
+                throw Error( name + " is reserved" );
             }
 
             // if a member was defined multiple times in the same class
@@ -730,7 +727,7 @@ exports.prototype.createAbstractCtor = function( cname )
  *
  * @param  {{public: Object, protected: Object, private: Object}}  members
  *
- * @param  {function()  ctor  class
+ * @param  {function()}  ctor  class
  * @param  {number}     cid  class id
  *
  * @return  {undefined}
@@ -1095,7 +1092,7 @@ function attachInstanceOf( instance )
  * @param  {function()}  inst  instance that the method is being called from
  * @param  {number}      cid   class id
  *
- * @return  {Object,null}  instance object if found, otherwise null
+ * @return  {Object|null}  instance object if found, otherwise null
  */
 exports.getMethodInstance = function( inst, cid )
 {
diff --git a/lib/VisibilityObjectFactory.js b/lib/VisibilityObjectFactory.js
index d3c7510..1be7f8a 100644
--- a/lib/VisibilityObjectFactory.js
+++ b/lib/VisibilityObjectFactory.js
@@ -109,7 +109,7 @@ exports.prototype._createPrivateLayer = function( atop_of, properties )
     obj_ctor.prototype = atop_of;
 
     // we'll be returning an instance, so that the prototype takes effect
-    obj = new obj_ctor();
+    var obj = new obj_ctor();
 
     // All protected properties need to be proxied from the private object
     // (which will be passed as the context) to the object containing protected
@@ -142,7 +142,7 @@ exports.prototype._doSetup = function(
     // copy over the methods
     if ( methods !== undefined )
     {
-        for ( method_name in methods )
+        for ( var method_name in methods )
         {
             if ( hasOwn.call( methods, method_name ) )
             {
@@ -172,7 +172,7 @@ exports.prototype._doSetup = function(
     }
 
     // initialize private/protected properties and store in instance data
-    for ( prop in properties )
+    for ( var prop in properties )
     {
         if ( hasOwn.call( properties, prop ) )
         {
@@ -205,7 +205,7 @@ exports.prototype.createPropProxy = function( base, dest, props )
 {
     var hasOwn = Object.prototype.hasOwnProperty;
 
-    for ( prop in props )
+    for ( var prop in props )
     {
         if ( !( hasOwn.call( props, prop ) ) )
         {
diff --git a/lib/interface.js b/lib/interface.js
index 69b74e6..6c9149a 100644
--- a/lib/interface.js
+++ b/lib/interface.js
@@ -51,7 +51,7 @@ var util           = require( __dirname + '/util' ),
  */
 module.exports = function()
 {
-    var type   = typeof arguments[ 0 ]
+    var type   = typeof arguments[ 0 ],
         result = null
     ;
 
diff --git a/lib/util.js b/lib/util.js
index 281f269..90b832f 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -153,7 +153,7 @@ exports.clone = function clone( data, deep )
             hasOwn = Object.prototype.hasOwnProperty;
 
         // copy data to the new object
-        for ( prop in data )
+        for ( var prop in data )
         {
             if ( hasOwn.call( data, prop ) )
             {
@@ -204,7 +204,7 @@ exports.copyTo = function( dest, src, deep )
     // slower; supports getters/setters
     if ( can_define_prop )
     {
-        for ( prop in src )
+        for ( var prop in src )
         {
             data = Object.getOwnPropertyDescriptor( src, prop );
 
@@ -228,7 +228,7 @@ exports.copyTo = function( dest, src, deep )
     // quick (keep if statement out of the loop)
     else
     {
-        for ( prop in src )
+        for ( var prop in src )
         {
             // normal copy; cloned if deep, otherwise by reference
             dest[ prop ] = ( deep )
@@ -274,7 +274,7 @@ exports.propParse = function( data, options )
 
     // for each of the given properties, determine what type of property we're
     // dealing with (in the classic OO sense)
-    for ( prop in data )
+    for ( var prop in data )
     {
         // ignore properties of instance prototypes
         if ( !( hasOwn.call( data, prop ) ) )
diff --git a/test/MemberBuilder/VisibilityTest.js b/test/MemberBuilder/VisibilityTest.js
index f3398af..bb6575b 100644
--- a/test/MemberBuilder/VisibilityTest.js
+++ b/test/MemberBuilder/VisibilityTest.js
@@ -81,7 +81,7 @@ require( 'common' ).testCase(
 
             _self.incAssertCount();
 
-            for ( level in _self.members )
+            for ( var level in _self.members )
             {
                 if ( typeof _self.members[ level ][ name ] === 'undefined' )
                 {
@@ -264,7 +264,7 @@ require( 'common' ).testCase(
         ;
 
         // ensure we can initialize the values of each visibility level
-        for ( vis in test )
+        for ( var vis in test )
         {
             this.assertStrictEqual( test[ vis ], members[ vis ],
                 "Visibility level '" + vis + "' cannot be initialized"
@@ -282,7 +282,7 @@ require( 'common' ).testCase(
         var _self = this,
             tests = [ 'public', 'protected', 'private' ];
 
-        for ( i in tests )
+        for ( var i in tests )
         {
             _self.basicVisPropTest( tests[ i ] );
             _self.basicVisMethodTest( tests[ i ] );
diff --git a/test/MethodWrappersTest.js b/test/MethodWrappersTest.js
index 1b1cb6b..5474981 100644
--- a/test/MethodWrappersTest.js
+++ b/test/MethodWrappersTest.js
@@ -23,7 +23,7 @@
 
 var common = require( './common' ),
     assert = require( 'assert' ),
-    util   = common.require( 'util' )
+    util   = common.require( 'util' ),
     sut    = common.require( 'MethodWrappers' )
 ;
 
@@ -45,7 +45,7 @@ var common = require( './common' ),
         {
             called = true;
             return instance;
-        }
+        },
 
         method = sut.standard.wrapNew(
             function()
@@ -152,7 +152,7 @@ var common = require( './common' ),
                 super_called = true;
             },
             null, 0, getInst
-        )
+        ),
 
         // the overriding method
         override = sut.standard.wrapOverride(
diff --git a/test/VisibilityObjectFactoryTest.js b/test/VisibilityObjectFactoryTest.js
index d4a1da8..e726707 100644
--- a/test/VisibilityObjectFactoryTest.js
+++ b/test/VisibilityObjectFactoryTest.js
@@ -111,7 +111,7 @@ var VisibilityObjectFactory = common.require( 'VisibilityObjectFactory' ),
     sut.createPropProxy( base, dest, props );
 
     // check to ensure the properties are properly proxied
-    for ( prop in props )
+    for ( var prop in props )
     {
         dest[ prop ] = val;
 
diff --git a/test/inc-testcase.js b/test/inc-testcase.js
index 4390828..a68f447 100644
--- a/test/inc-testcase.js
+++ b/test/inc-testcase.js
@@ -25,6 +25,7 @@ var assert         = require( 'assert' ),
     assert_wrapped = {},
     acount         = 0,
     icount         = 0,
+    scount         = 0,
     skpcount       = 0,
     tcount         = 0,
 
@@ -41,7 +42,7 @@ var assert         = require( 'assert' ),
 
 // wrap each of the assertions so that we can keep track of the number of times
 // that they were invoked
-for ( f in assert )
+for ( var f in assert )
 {
     var _assert_cur = assert[ f ];
 
@@ -105,7 +106,7 @@ module.exports = function( test_case )
     delete test_case.setUp;
 
     // run each test in the case
-    for ( test in test_case )
+    for ( var test in test_case )
     {
         // xUnit-style setup
         if ( setUp )
@@ -282,7 +283,7 @@ function getMock( proto )
         proto = Mock.prototype = new P()
     ;
 
-    for ( i in proto )
+    for ( var i in proto )
     {
         // only mock out methods
         if ( typeof proto[ i ] !== 'function' )
@@ -350,7 +351,7 @@ function outputTestFailures( failures )
         var err = '',
             i   = failures.length;
 
-        for ( i in failures )
+        for ( var i in failures )
         {
             var failure = failures[ i ];
 
@@ -368,7 +369,7 @@ function outputTestFailures( failures )
         throw Error( err );
     }
 
-    for ( i = 0; i < failures.length; i++ )
+    for ( var i = 0; i < failures.length; i++ )
     {
         cur = failures[ i ];
 
diff --git a/test/test-class-constructor.js b/test/test-class-constructor.js
index e036dab..ebf14d9 100644
--- a/test/test-class-constructor.js
+++ b/test/test-class-constructor.js
@@ -29,7 +29,7 @@ var common = require( './common' ),
 // will still be set even if the context of the constructor is wrong
 var construct_count   = 0,
     construct_context = null,
-    construct_args    = null
+    construct_args    = null,
 
 // create a basic test class
     Foo = Class.extend(
diff --git a/test/test-class-extend.js b/test/test-class-extend.js
index 99c4246..50e9890 100644
--- a/test/test-class-extend.js
+++ b/test/test-class-extend.js
@@ -36,7 +36,7 @@ var foo_props = {
         Class( foo_props ),
     ],
 
-    class_count = classes.length
+    class_count = classes.length,
 
     // will hold the class being tested
     Foo = null
diff --git a/test/test-class-name.js b/test/test-class-name.js
index 57bfd24..3746cc3 100644
--- a/test/test-class-name.js
+++ b/test/test-class-name.js
@@ -199,8 +199,8 @@ var common = require( './common' ),
 ( function testCanCreateNamedClassUsingStagingMethod()
 {
     var name   = 'Foo',
-        named  = Class( name ).extend( {} )
-        namedi = Class( name ).implement( Interface( {} ) ).extend( {} )
+        named  = Class( name ).extend( {} ),
+        namedi = Class( name ).implement( Interface( {} ) ).extend( {} ),
 
         // we should also be able to extend classes in this manner
         namede = Class( name ).implement( Interface( {} ) ).extend( named, {} )
diff --git a/test/test-class-parent.js b/test/test-class-parent.js
index 9b3d156..0d7af88 100644
--- a/test/test-class-parent.js
+++ b/test/test-class-parent.js
@@ -23,7 +23,7 @@
 
 var common = require( './common' ),
     assert = require( 'assert' ),
-    Class  = common.require( 'class' );
+    Class  = common.require( 'class' ),
 
     // we store these outside of the class to ensure that visibility bugs do not
     // get in the way of our assertions
diff --git a/test/test-class_builder-final.js b/test/test-class_builder-final.js
index 2e8c91e..4002ce7 100644
--- a/test/test-class_builder-final.js
+++ b/test/test-class_builder-final.js
@@ -28,7 +28,7 @@ var common  = require( './common' ),
         common.require( 'VisibilityObjectFactoryFactory' ).fromEnvironment()
     ),
 
-    Class      = common.require( 'class' )
+    Class      = common.require( 'class' ),
     FinalClass = common.require( 'class_final' )
 ;
 
diff --git a/test/test-class_builder-member-restrictions.js b/test/test-class_builder-member-restrictions.js
index 54fb005..a852ef5 100644
--- a/test/test-class_builder-member-restrictions.js
+++ b/test/test-class_builder-member-restrictions.js
@@ -24,6 +24,7 @@
 var common  = require( './common' ),
     assert  = require( 'assert' ),
 
+    Class        = common.require( 'class' ),
     ClassBuilder = common.require( 'ClassBuilder' ),
     builder      = ClassBuilder(
         common.require( 'MemberBuilder' )(),
@@ -84,7 +85,7 @@ var common  = require( './common' ),
         count    = 0;
 
     // test each of the reserved members
-    for ( name in reserved )
+    for ( var name in reserved )
     {
         // properties
         assert['throws'](
@@ -137,7 +138,7 @@ var common  = require( './common' ),
         "Can retrieve hash of forced-public methods"
     );
 
-    for ( name in pub )
+    for ( var name in pub )
     {
         count++;
     }
@@ -176,12 +177,12 @@ var common  = require( './common' ),
     var pub = ClassBuilder.getForcedPublicMethods();
 
     // test each of the reserved members
-    for ( name in pub )
+    for ( var name in pub )
     {
         assert['throws']( function()
         {
             var obj = {};
-            obj[ name ] = function() {};
+            obj[ 'private ' + name ] = function() {};
 
             Class( obj );
         }, Error, "Forced-public methods must be declared as public" );
diff --git a/test/test-class_builder-static.js b/test/test-class_builder-static.js
index c6b5a2e..305ec68 100644
--- a/test/test-class_builder-static.js
+++ b/test/test-class_builder-static.js
@@ -22,7 +22,7 @@
  */
 
 var common   = require( './common' ),
-    fallback = common.require( 'util' ).definePropertyFallback()
+    fallback = common.require( 'util' ).definePropertyFallback(),
 
     // XXX: get rid of this disgusting mess; we're mid-refactor and all these
     // dependencies should not be necessary for testing
@@ -183,7 +183,7 @@ require( 'common' ).testCase(
         // we must define in this manner so older engines won't blow up due to
         // syntax errors
         var def    = {},
-            val    = 'baz'
+            val    = 'baz',
             called = [];
 
         Object.defineProperty( def, 'public static foo', {
@@ -615,7 +615,7 @@ require( 'common' ).testCase(
                     this.foo = val;
                 },
             },
-            val    = 'baz'
+            val    = 'baz',
             called = [];
 
         Object.defineProperty( def, 'protected static foo', {
@@ -915,7 +915,7 @@ require( 'common' ).testCase(
                     this.foo = val;
                 },
             },
-            val    = 'baz'
+            val    = 'baz',
             called = [];
 
         Object.defineProperty( def, 'private static foo', {
diff --git a/test/test-class_builder-visibility.js b/test/test-class_builder-visibility.js
index 7fd6230..84214a1 100644
--- a/test/test-class_builder-visibility.js
+++ b/test/test-class_builder-visibility.js
@@ -62,7 +62,7 @@ require( 'common' ).testCase(
      */
     'Self property references instance rather than property object': function()
     {
-        var result = null
+        var result = null,
             ref    = null,
 
             foo = this.builder.build( {
diff --git a/test/test-util-clone.js b/test/test-util-clone.js
index 433660a..cf8b649 100644
--- a/test/test-util-clone.js
+++ b/test/test-util-clone.js
@@ -52,7 +52,7 @@ for ( var i = 0, len = arr.length; i < len; i++ )
 }
 
 // ensure object was properly cloned
-for ( prop in obj )
+for ( var prop in obj )
 {
     assert.equal(
         obj2[ prop ],
@@ -94,7 +94,7 @@ while ( deep_i-- )
     );
 }
 
-for ( prop in deep_obj )
+for ( var prop in deep_obj )
 {
     assert.ok(
         ( deep_obj2[ prop ] !== deep_obj[ prop ] ),
diff --git a/test/test-util-copy.js b/test/test-util-copy.js
index 405d04a..96be034 100644
--- a/test/test-util-copy.js
+++ b/test/test-util-copy.js
@@ -49,7 +49,7 @@ var common = require( './common' ),
 
     copyTo( dest, src );
 
-    for ( key in src )
+    for ( var key in src )
     {
         assert.deepEqual( src[ key ], dest[ key ],
             "Copies by reference by default"
diff --git a/test/test-util-prop-parse-keywords.js b/test/test-util-prop-parse-keywords.js
index 45ff875..cacaf6e 100644
--- a/test/test-util-prop-parse-keywords.js
+++ b/test/test-util-prop-parse-keywords.js
@@ -161,7 +161,7 @@ var common = require( './common' ),
         },
     } );
 
-    for ( prop in parsed_keywords )
+    for ( var prop in parsed_keywords )
     {
         assert.deepEqual(
             parsed_keywords[ prop ],
diff --git a/test/test-util-prop-parse.js b/test/test-util-prop-parse.js
index a3051e0..dc9cc02 100644
--- a/test/test-util-prop-parse.js
+++ b/test/test-util-prop-parse.js
@@ -61,7 +61,7 @@ if ( get_set )
 
 
 var chk_each = {};
-for ( i in data )
+for ( var i in data )
 {
     chk_each[ i ] = 1;
 }
@@ -152,7 +152,7 @@ if ( get_set )
 
 
 var chk_each_count = 0;
-for ( item in chk_each )
+for ( var item in chk_each )
 {
     chk_each_count++;
 }
diff --git a/tools/externs-global.js b/tools/externs-global.js
new file mode 100644
index 0000000..bc0bea8
--- /dev/null
+++ b/tools/externs-global.js
@@ -0,0 +1,9 @@
+/**
+ * Common global externs for Closure Compiler
+ */
+
+// available in most modern environments or extensions
+var console = {};
+
+// Node.js
+var process = {};