module.exports = function()

in css/jetbrains-bundle/sales-chat.js [823:874]
14 lines of code
13 McCabe index (conditional complexity)

	module.exports = function(Base, NAME, Constructor, next, DEFAULT, IS_SET, FORCED){
	  $iterCreate(Constructor, NAME, next);
	  var getMethod = function(kind){
	    if(!BUGGY && kind in proto)return proto[kind];
	    switch(kind){
	      case KEYS: return function keys(){ return new Constructor(this, kind); };
	      case VALUES: return function values(){ return new Constructor(this, kind); };
	    } return function entries(){ return new Constructor(this, kind); };
	  };
	  var TAG        = NAME + ' Iterator'
	    , DEF_VALUES = DEFAULT == VALUES
	    , VALUES_BUG = false
	    , proto      = Base.prototype
	    , $native    = proto[ITERATOR] || proto[FF_ITERATOR] || DEFAULT && proto[DEFAULT]
	    , $default   = $native || getMethod(DEFAULT)
	    , $entries   = DEFAULT ? !DEF_VALUES ? $default : getMethod('entries') : undefined
	    , $anyNative = NAME == 'Array' ? proto.entries || $native : $native
	    , methods, key, IteratorPrototype;
	  // Fix native
	  if($anyNative){
	    IteratorPrototype = getPrototypeOf($anyNative.call(new Base));
	    if(IteratorPrototype !== Object.prototype){
	      // Set @@toStringTag to native iterators
	      setToStringTag(IteratorPrototype, TAG, true);
	      // fix for some old engines
	      if(!LIBRARY && !has(IteratorPrototype, ITERATOR))hide(IteratorPrototype, ITERATOR, returnThis);
	    }
	  }
	  // fix Array#{values, @@iterator}.name in V8 / FF
	  if(DEF_VALUES && $native && $native.name !== VALUES){
	    VALUES_BUG = true;
	    $default = function values(){ return $native.call(this); };
	  }
	  // Define iterator
	  if((!LIBRARY || FORCED) && (BUGGY || VALUES_BUG || !proto[ITERATOR])){
	    hide(proto, ITERATOR, $default);
	  }
	  // Plug for library
	  Iterators[NAME] = $default;
	  Iterators[TAG]  = returnThis;
	  if(DEFAULT){
	    methods = {
	      values:  DEF_VALUES ? $default : getMethod(VALUES),
	      keys:    IS_SET     ? $default : getMethod(KEYS),
	      entries: $entries
	    };
	    if(FORCED)for(key in methods){
	      if(!(key in proto))redefine(proto, key, methods[key]);
	    } else $export($export.P + $export.F * (BUGGY || VALUES_BUG), NAME, methods);
	  }
	  return methods;
	};