immutable-js
diff --git a/‎src/List.js
Lines changed: 2 additions & 0 deletions b/‎src/List.js
Lines changed: 2 additions & 0 deletions
diff --git a/‎src/Map.js
Lines changed: 2 additions & 0 deletions b/‎src/Map.js
Lines changed: 2 additions & 0 deletions
diff --git a/‎src/OrderedMap.js
Lines changed: 5 additions & 2 deletions b/‎src/OrderedMap.js
Lines changed: 5 additions & 2 deletions
diff --git a/‎src/Stack.js
Lines changed: 16 additions & 14 deletions b/‎src/Stack.js
Lines changed: 16 additions & 14 deletions
@@ -257,6 +257,8 @@ ListPrototype['@@transducer/result'] = function (obj) {
   return obj.asImmutable();
 };
 
+ListPrototype.__empty = emptyList;
+
 class VNode {
   constructor(array, ownerID) {
     this.array = array;
 
@@ -185,6 +185,8 @@ MapPrototype['@@transducer/result'] = function (obj) {
   return obj.asImmutable();
 };
 
+MapPrototype.__empty = emptyMap;
+
 // #pragma Trie Nodes
 
 class ArrayMapNode {
 
@@ -93,8 +93,11 @@ export class OrderedMap extends Map {
 
 OrderedMap.isOrderedMap = isOrderedMap;
 
-OrderedMap.prototype[IS_ORDERED_SYMBOL] = true;
-OrderedMap.prototype[DELETE] = OrderedMap.prototype.remove;
+const OrderedMapPrototype = OrderedMap.prototype;
+OrderedMapPrototype[IS_ORDERED_SYMBOL] = true;
+OrderedMapPrototype[DELETE] = OrderedMapPrototype.remove;
+
+OrderedMapPrototype.__empty = emptyOrderedMap;
 
 function makeOrderedMap(map, list, ownerID, hash) {
   const omap = Object.create(OrderedMap.prototype);
 
@@ -192,6 +192,21 @@ export class Stack extends IndexedCollection {
   }
 }
 
+function makeStack(size, head, ownerID, hash) {
+  const map = Object.create(StackPrototype);
+  map.size = size;
+  map._head = head;
+  map.__ownerID = ownerID;
+  map.__hash = hash;
+  map.__altered = false;
+  return map;
+}
+
+let EMPTY_STACK;
+function emptyStack() {
+  return EMPTY_STACK || (EMPTY_STACK = makeStack(0));
+}
+
 Stack.isStack = isStack;
 
 const StackPrototype = Stack.prototype;
@@ -210,17 +225,4 @@ StackPrototype['@@transducer/result'] = function (obj) {
   return obj.asImmutable();
 };
 
-function makeStack(size, head, ownerID, hash) {
-  const map = Object.create(StackPrototype);
-  map.size = size;
-  map._head = head;
-  map.__ownerID = ownerID;
-  map.__hash = hash;
-  map.__altered = false;
-  return map;
-}
-
-let EMPTY_STACK;
-function emptyStack() {
-  return EMPTY_STACK || (EMPTY_STACK = makeStack(0));
-}
+StackPrototype.__empty = emptyStack;