Remove undefined from the IIFE to allow easier customizations with the iife build option.

Former-commit-id: a496b1fba74fdab3b2819d27b769371f73364684

build.js

@@ -588,7 +588,7 @@
       '    lodash exports=...   Comma separated names of ways to export the `lodash` function',
       '                         (i.e. “amd”, “commonjs”, “global”, “node”, and “none”)',
       '    lodash iife=...      Code to replace the immediately-invoked function expression that wraps Lo-Dash',
-      '                         (e.g. `lodash iife="!function(window,undefined){%output%}(this)"`)',
+      '                         (e.g. `lodash iife="!function(window){%output%}(this)"`)',
       '',
       '    lodash template=...  File path pattern used to match template files to precompile',
       '                         (e.g. `lodash template=./*.jst`)',
@@ -964,8 +964,8 @@
 
         source = source
           .replace(/context/g, 'window')
-          .replace(/(?:\n +\/\*[^*]*\*+(?:[^\/][^*]*\*+)*\/)?\n *var Array *=[\s\S]+?;\n/m, '')
+          .replace(/(?:\n +\/\*[^*]*\*+(?:[^\/][^*]*\*+)*\/)?\n *var Array *=[\s\S]+?;\n/, '')
-          .replace(/(?: *\/\/.*\n)* *var lodash *= *runInContext.+\n/, '');
+          .replace(/^ *var lodash *= *runInContext.+\n+/m, '');
       }
       else {
         source = source.replace(snippet, '');
@@ -1136,7 +1136,7 @@
 
     // remove `noCharByIndex` from `_.at`
     source = source.replace(matchFunction(source, 'at'), function(match) {
-      return match.replace(/^ *if *\(noCharByIndex[^}]+}\n/m, '');
+      return match.replace(/^ *if *\(noCharByIndex[^}]+}\n+/m, '');
     });
 
     // remove `noCharByIndex` from `_.reduceRight`
@@ -2359,19 +2359,19 @@
         source = source.replace(/(?: *\/\/.*\n)*( *)if *\(typeof +define[\s\S]+?else /, '$1');
       }
       if (!isNode) {
-        source = source.replace(/(?: *\/\/.*\n)*( *)if *\(freeModule[\s\S]+?else *{([\s\S]+?\n)\1}\n/, '$1$2');
+        source = source.replace(/(?: *\/\/.*\n)*( *)if *\(freeModule[\s\S]+?else *{([\s\S]+?\n)\1}\n+/, '$1$2');
       }
       if (!isCommonJS) {
-        source = source.replace(/(?: *\/\/.*\n)*(?:( *)else *{)?\s*freeExports\.\w+ *=[\s\S]+?(?:\n\1})?\n/, '');
+        source = source.replace(/(?: *\/\/.*\n)*(?:( *)else *{)?\s*freeExports\.\w+ *=[\s\S]+?(?:\n\1})?\n+/, '');
       }
       if (!isGlobal) {
-        source = source.replace(/(?:( *)(})? *else(?: *if *\(_\))? *{)?(?:\s*\/\/.*)*\s*(?:window\._|_\.templates) *=[\s\S]+?(?:\n\1})?\n/g, '$1$2\n');
+        source = source.replace(/(?:( *)(})? *else(?: *if *\(_\))? *{)?(?:\s*\/\/.*)*\s*(?:window\._|_\.templates) *=[\s\S]+?(?:\n\1})?\n+/g, '$1$2\n');
       }
       // remove `if (freeExports) {...}` if it's empty
       if (isAMD && isGlobal) {
-        source = source.replace(/(?: *\/\/.*\n)* *(?:else )?if *\(freeExports\) *{\s*}\n/, '');
+        source = source.replace(/(?: *\/\/.*\n)* *(?:else )?if *\(freeExports\) *{\s*}\n+/, '');
       } else {
-        source = source.replace(/(?: *\/\/.*\n)* *(?:else )?if *\(freeExports\) *{\s*}(?:\s*else *{([\s\S]+?) *})?\n/, '$1\n');
+        source = source.replace(/(?: *\/\/.*\n)* *(?:else )?if *\(freeExports\) *{\s*}(?:\s*else *{([\s\S]+?) *})?\n+/, '$1\n');
       }
     }());
 
@@ -2454,7 +2454,7 @@
       }
       if (!source.match(/var (?:hasDontEnumBug|hasEnumPrototype|iteratesOwnLast|nonEnumArgs)\b/g)) {
         // remove IIFE used to assign `hasDontEnumBug`, `hasEnumPrototype`, `iteratesOwnLast`, and `nonEnumArgs`
-        source = source.replace(/^ *\(function\(\) *{[\s\S]+?}\(1\)\);\n/m, '');
+        source = source.replace(/^ *\(function\(\) *{[\s\S]+?}\(1\)\);\n+/m, '');
       }
     }
     if ((source.match(/\bfreeModule\b/g) || []).length < 2) {

build/minify.js

@@ -353,7 +353,7 @@
       source = source.replace(license, '');
     }
 
-    var hasIIFE = /^;?\(function[^{]+{\s*/.test(source),
+    var hasIIFE = /^;?\(function[^{]+{/.test(source),
         isStrict = hasIIFE && /^;?\(function[^{]+{\s*["']use strict["']/.test(source);
 
     // to avoid stripping the IIFE, convert it to a function call

lodash.js

@@ -6,7 +6,10 @@
  * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud Inc.
  * Available under MIT license <http://lodash.com/license>
  */
-;(function(window, undefined) {
+;(function(window) {
+
+  /** Used as a safe reference for `undefined` in pre ES5 environments */
+  var undefined;
 
   /** Detect free variable `exports` */
   var freeExports = typeof exports == 'object' && exports;
@@ -115,7 +118,7 @@
    * @static
    * @memberOf _
    * @category Utilities
-   * @param {Object} context The context object.
+   * @param {Object} [context=window] The context object.
    * @returns {Function} Returns the `lodash` function.
    */
   function runInContext(context) {
@@ -5161,9 +5164,9 @@
 
   /*--------------------------------------------------------------------------*/
 
+  // expose Lo-Dash
   var lodash = runInContext();
 
-  // expose Lo-Dash
   // some AMD build optimizers, like r.js, check for specific condition patterns like the following:
   if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
     // Expose Lo-Dash to the global object even when an AMD loader is present in