From 8c7d7433613a8851580c9f9bf70f5f4a5ccabda9 Mon Sep 17 00:00:00 2001
From: "krystian.karczewski" <karcz.k@gmail.com>
Date: Tue, 2 Feb 2016 11:51:31 +0100
Subject: [PATCH 1/2] Fix for #5957: Bug on resolving default props
 (HTMLAllCollection)

---
 src/isomorphic/classic/element/ReactElement.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/isomorphic/classic/element/ReactElement.js b/src/isomorphic/classic/element/ReactElement.js
index 44aa50f7d2..024e3b29e3 100644
--- a/src/isomorphic/classic/element/ReactElement.js
+++ b/src/isomorphic/classic/element/ReactElement.js
@@ -153,7 +153,7 @@ ReactElement.createElement = function(type, config, children) {
   if (type && type.defaultProps) {
     var defaultProps = type.defaultProps;
     for (propName in defaultProps) {
-      if (typeof props[propName] === 'undefined') {
+      if (props[propName] === undefined) {
         props[propName] = defaultProps[propName];
       }
     }

From ef2b1f26efb61ab18eac6919c3e55c46bfa3d385 Mon Sep 17 00:00:00 2001
From: karczk <karcz.k@gmail.com>
Date: Tue, 2 Feb 2016 19:35:58 +0100
Subject: [PATCH 2/2] Unnecessary type comparisons have been changed to value
 comparison

---
 src/addons/link/ReactLink.js                               | 2 +-
 src/isomorphic/classic/class/ReactClass.js                 | 2 +-
 src/renderers/dom/client/ReactDOMSelection.js              | 4 ++--
 src/renderers/dom/client/ReactInputSelection.js            | 2 +-
 src/renderers/shared/reconciler/ReactCompositeComponent.js | 6 +++---
 5 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/addons/link/ReactLink.js b/src/addons/link/ReactLink.js
index 70bcf61004..ea6435c92b 100644
--- a/src/addons/link/ReactLink.js
+++ b/src/addons/link/ReactLink.js
@@ -55,7 +55,7 @@ function ReactLink(value, requestChange) {
  */
 function createLinkTypeChecker(linkType) {
   var shapes = {
-    value: typeof linkType === 'undefined' ?
+    value: linkType === undefined ?
       React.PropTypes.any.isRequired :
       linkType.isRequired,
     requestChange: React.PropTypes.func.isRequired,
diff --git a/src/isomorphic/classic/class/ReactClass.js b/src/isomorphic/classic/class/ReactClass.js
index ea049acafc..223e58bf63 100644
--- a/src/isomorphic/classic/class/ReactClass.js
+++ b/src/isomorphic/classic/class/ReactClass.js
@@ -777,7 +777,7 @@ var ReactClass = {
       var initialState = this.getInitialState ? this.getInitialState() : null;
       if (__DEV__) {
         // We allow auto-mocks to proceed as if they're returning null.
-        if (typeof initialState === 'undefined' &&
+        if (initialState === undefined &&
             this.getInitialState._isMockFunction) {
           // This is probably bad practice. Consider warning here and
           // deprecating this convenience.
diff --git a/src/renderers/dom/client/ReactDOMSelection.js b/src/renderers/dom/client/ReactDOMSelection.js
index 824fa210f9..aff9e894bb 100644
--- a/src/renderers/dom/client/ReactDOMSelection.js
+++ b/src/renderers/dom/client/ReactDOMSelection.js
@@ -138,7 +138,7 @@ function setIEOffsets(node, offsets) {
   var range = document.selection.createRange().duplicate();
   var start, end;
 
-  if (typeof offsets.end === 'undefined') {
+  if (offsets.end === undefined) {
     start = offsets.start;
     end = start;
   } else if (offsets.start > offsets.end) {
@@ -176,7 +176,7 @@ function setModernOffsets(node, offsets) {
   var selection = window.getSelection();
   var length = node[getTextContentAccessor()].length;
   var start = Math.min(offsets.start, length);
-  var end = typeof offsets.end === 'undefined' ?
+  var end = offsets.end === undefined ?
             start : Math.min(offsets.end, length);
 
   // IE 11 uses modern selection, but doesn't support the extend method.
diff --git a/src/renderers/dom/client/ReactInputSelection.js b/src/renderers/dom/client/ReactInputSelection.js
index e620246ab6..46e6931a6d 100644
--- a/src/renderers/dom/client/ReactInputSelection.js
+++ b/src/renderers/dom/client/ReactInputSelection.js
@@ -114,7 +114,7 @@ var ReactInputSelection = {
   setSelection: function(input, offsets) {
     var start = offsets.start;
     var end = offsets.end;
-    if (typeof end === 'undefined') {
+    if (end === undefined) {
       end = start;
     }
 
diff --git a/src/renderers/shared/reconciler/ReactCompositeComponent.js b/src/renderers/shared/reconciler/ReactCompositeComponent.js
index f453538916..3efdf37054 100644
--- a/src/renderers/shared/reconciler/ReactCompositeComponent.js
+++ b/src/renderers/shared/reconciler/ReactCompositeComponent.js
@@ -188,7 +188,7 @@ var ReactCompositeComponentMixin = {
         Component.displayName || Component.name || 'Component';
 
       warning(
-        typeof inst.props === 'undefined' || !propsMutated,
+        inst.props === undefined || !propsMutated,
         '%s(...): When calling super() in `%s`, make sure to pass ' +
         'up the same props that your component\'s constructor was passed.',
         componentName, componentName
@@ -673,7 +673,7 @@ var ReactCompositeComponentMixin = {
 
     if (__DEV__) {
       warning(
-        typeof shouldUpdate !== 'undefined',
+        shouldUpdate !== undefined,
         '%s.shouldComponentUpdate(): Returned undefined instead of a ' +
         'boolean value. Make sure to return true or false.',
         this.getName() || 'ReactCompositeComponent'
@@ -839,7 +839,7 @@ var ReactCompositeComponentMixin = {
     var renderedComponent = inst.render();
     if (__DEV__) {
       // We allow auto-mocks to proceed as if they're returning null.
-      if (typeof renderedComponent === 'undefined' &&
+      if (renderedComponent === undefined &&
           inst.render._isMockFunction) {
         // This is probably bad practice. Consider warning here and
         // deprecating this convenience.