diff --git a/build/build.ls b/build/build.ls
index ca3f0df12c7c..4b58ff281b90 100644
--- a/build/build.ls
+++ b/build/build.ls
@@ -161,10 +161,8 @@ module.exports = ({modules = [], blacklist = [], library = no}, next)!->
 
     next null """
       #banner
-      !function(undefined){
+      !function(__e, __g, undefined){
       'use strict';
-      var __e = null, __g = null;
-      
       #script
       // CommonJS export
       if(typeof module != 'undefined' && module.exports)module.exports = __e;
@@ -172,5 +170,5 @@ module.exports = ({modules = [], blacklist = [], library = no}, next)!->
       else if(typeof define == 'function' && define.amd)define(function(){return __e});
       // Export to global object
       else __g.core = __e;
-      }();
+      }(1, 1);
       """
diff --git a/build/index.js b/build/index.js
index 4dc2c74b5733..aaa52798ee42 100644
--- a/build/index.js
+++ b/build/index.js
@@ -84,7 +84,7 @@
                 if (check(err)) {
                   return;
                 }
-                next(null, "" + banner + "\n!function(undefined){\n'use strict';\nvar __e = null, __g = null;\n\n" + script + "\n// CommonJS export\nif(typeof module != 'undefined' && module.exports)module.exports = __e;\n// RequireJS export\nelse if(typeof define == 'function' && define.amd)define(function(){return __e});\n// Export to global object\nelse __g.core = __e;\n}();");
+                next(null, "" + banner + "\n!function(__e, __g, undefined){\n'use strict';\n" + script + "\n// CommonJS export\nif(typeof module != 'undefined' && module.exports)module.exports = __e;\n// RequireJS export\nelse if(typeof define == 'function' && define.amd)define(function(){return __e});\n// Export to global object\nelse __g.core = __e;\n}(1, 1);");
               });
             });
           });
diff --git a/library/modules/$.core.js b/library/modules/$.core.js
index 43cf376dcdae..b5d1f15f86b9 100644
--- a/library/modules/$.core.js
+++ b/library/modules/$.core.js
@@ -1,3 +1,3 @@
 var core = {};
 module.exports = core;
-if(typeof __e != 'undefined')__e = core; // eslint-disable-line no-undef
\ No newline at end of file
+if(typeof __e == 'number')__e = core; // eslint-disable-line no-undef
\ No newline at end of file
diff --git a/library/modules/$.def.js b/library/modules/$.def.js
index 0e8f2c495c88..871e5a61bc07 100644
--- a/library/modules/$.def.js
+++ b/library/modules/$.def.js
@@ -1,6 +1,7 @@
 var global     = require('./$.global')
   , isFunction = require('./$.is-function')
-  , core       = require('./$.core');
+  , core       = require('./$.core')
+  , PROTOTYPE  = 'prototype';
 function ctx(fn, that){
   return function(){
     return fn.apply(that, arguments);
@@ -18,7 +19,7 @@ function $def(type, name, source){
     , isGlobal = type & $def.G
     , isProto  = type & $def.P
     , target   = isGlobal ? global : type & $def.S
-        ? global[name] : (global[name] || {}).prototype
+        ? global[name] : (global[name] || {})[PROTOTYPE]
     , exports  = isGlobal ? core : core[name] || (core[name] = {});
   if(isGlobal)source = name;
   for(key in source){
@@ -36,12 +37,12 @@ function $def(type, name, source){
       exp = function(param){
         return this instanceof C ? new C(param) : C(param);
       };
-      exp.prototype = C.prototype;
+      exp[PROTOTYPE] = C[PROTOTYPE];
     }(out);
     else exp = isProto && isFunction(out) ? ctx(Function.call, out) : out;
     // export
     exports[key] = exp;
-    if(isProto)(exports.prototype || (exports.prototype = {}))[key] = out;
+    if(isProto)(exports[PROTOTYPE] || (exports[PROTOTYPE] = {}))[key] = out;
   }
 }
 module.exports = $def;
\ No newline at end of file
diff --git a/library/modules/$.global.js b/library/modules/$.global.js
index 8f75da770546..8c15fdc5b62d 100644
--- a/library/modules/$.global.js
+++ b/library/modules/$.global.js
@@ -1,3 +1,3 @@
 var global = typeof self != 'undefined' && self.Math == Math ? self : Function('return this')();
-if(typeof __g != 'undefined')__g = global; // eslint-disable-line no-undef
-module.exports = global;
\ No newline at end of file
+module.exports = global;
+if(typeof __g == 'number')__g = global; // eslint-disable-line no-undef
\ No newline at end of file
diff --git a/modules/$.core.js b/modules/$.core.js
index 43cf376dcdae..b5d1f15f86b9 100644
--- a/modules/$.core.js
+++ b/modules/$.core.js
@@ -1,3 +1,3 @@
 var core = {};
 module.exports = core;
-if(typeof __e != 'undefined')__e = core; // eslint-disable-line no-undef
\ No newline at end of file
+if(typeof __e == 'number')__e = core; // eslint-disable-line no-undef
\ No newline at end of file
diff --git a/modules/$.def.js b/modules/$.def.js
index b0f38c3809c9..2141f1add07a 100644
--- a/modules/$.def.js
+++ b/modules/$.def.js
@@ -2,7 +2,8 @@ var global     = require('./$.global')
   , core       = require('./$.core')
   , hide       = require('./$.hide')
   , $redef     = require('./$.redef')
-  , isFunction = require('./$.is-function');
+  , isFunction = require('./$.is-function')
+  , PROTOTYPE  = 'prototype';
 function ctx(fn, that){
   return function(){
     return fn.apply(that, arguments);
@@ -21,7 +22,7 @@ function $def(type, name, source){
     , isGlobal = type & $def.G
     , isProto  = type & $def.P
     , target   = isGlobal ? global : type & $def.S
-        ? global[name] || (global[name] = {}) : (global[name] || {}).prototype
+        ? global[name] || (global[name] = {}) : (global[name] || {})[PROTOTYPE]
     , exports  = isGlobal ? core : core[name] || (core[name] = {});
   if(isGlobal)source = name;
   for(key in source){
@@ -36,7 +37,7 @@ function $def(type, name, source){
     if(target && !own)$redef(target, key, out);
     // export
     if(exports[key] != out)hide(exports, key, exp);
-    if(isProto)(exports.prototype || (exports.prototype = {}))[key] = out;
+    if(isProto)(exports[PROTOTYPE] || (exports[PROTOTYPE] = {}))[key] = out;
   }
 }
 module.exports = $def;
\ No newline at end of file
diff --git a/modules/$.global.js b/modules/$.global.js
index 8f75da770546..8c15fdc5b62d 100644
--- a/modules/$.global.js
+++ b/modules/$.global.js
@@ -1,3 +1,3 @@
 var global = typeof self != 'undefined' && self.Math == Math ? self : Function('return this')();
-if(typeof __g != 'undefined')__g = global; // eslint-disable-line no-undef
-module.exports = global;
\ No newline at end of file
+module.exports = global;
+if(typeof __g == 'number')__g = global; // eslint-disable-line no-undef
\ No newline at end of file
diff --git a/modules/library/$.def.js b/modules/library/$.def.js
index 0e8f2c495c88..871e5a61bc07 100644
--- a/modules/library/$.def.js
+++ b/modules/library/$.def.js
@@ -1,6 +1,7 @@
 var global     = require('./$.global')
   , isFunction = require('./$.is-function')
-  , core       = require('./$.core');
+  , core       = require('./$.core')
+  , PROTOTYPE  = 'prototype';
 function ctx(fn, that){
   return function(){
     return fn.apply(that, arguments);
@@ -18,7 +19,7 @@ function $def(type, name, source){
     , isGlobal = type & $def.G
     , isProto  = type & $def.P
     , target   = isGlobal ? global : type & $def.S
-        ? global[name] : (global[name] || {}).prototype
+        ? global[name] : (global[name] || {})[PROTOTYPE]
     , exports  = isGlobal ? core : core[name] || (core[name] = {});
   if(isGlobal)source = name;
   for(key in source){
@@ -36,12 +37,12 @@ function $def(type, name, source){
       exp = function(param){
         return this instanceof C ? new C(param) : C(param);
       };
-      exp.prototype = C.prototype;
+      exp[PROTOTYPE] = C[PROTOTYPE];
     }(out);
     else exp = isProto && isFunction(out) ? ctx(Function.call, out) : out;
     // export
     exports[key] = exp;
-    if(isProto)(exports.prototype || (exports.prototype = {}))[key] = out;
+    if(isProto)(exports[PROTOTYPE] || (exports[PROTOTYPE] = {}))[key] = out;
   }
 }
 module.exports = $def;
\ No newline at end of file