diff --git a/tests/baselines/reference/reactNamespaceJSXEmit.js b/tests/baselines/reference/reactNamespaceJSXEmit.js
index fca5c611bbd..8282cd628ee 100644
--- a/tests/baselines/reference/reactNamespaceJSXEmit.js
+++ b/tests/baselines/reference/reactNamespaceJSXEmit.js
@@ -14,9 +14,9 @@ declare var x: any;
 
 //// [reactNamespaceJSXEmit.js]
 var __assign = (this && this.__assign) || Object.assign || function(t) {
-    for (var i = 1, n = arguments.length; i < n; i++) {
+    for (var i = 1; i < arguments.length; i++) {
         var s = arguments[i];
-        if (s != null) for (var p in s) if (s.hasOwnProperty(p)) t[p] = s[p];
+        for (var p in s) if (s.hasOwnProperty(p)) t[p] = s[p];
     }
     return t;
 };
diff --git a/tests/baselines/reference/tsxExternalModuleEmit2.js b/tests/baselines/reference/tsxExternalModuleEmit2.js
index fcb41f7ce38..cce67693817 100644
--- a/tests/baselines/reference/tsxExternalModuleEmit2.js
+++ b/tests/baselines/reference/tsxExternalModuleEmit2.js
@@ -20,9 +20,9 @@ declare var Foo, React;
 //// [app.js]
 "use strict";
 var __assign = (this && this.__assign) || Object.assign || function(t) {
-    for (var i = 1, n = arguments.length; i < n; i++) {
+    for (var i = 1; i < arguments.length; i++) {
         var s = arguments[i];
-        if (s != null) for (var p in s) if (s.hasOwnProperty(p)) t[p] = s[p];
+        for (var p in s) if (s.hasOwnProperty(p)) t[p] = s[p];
     }
     return t;
 };
diff --git a/tests/baselines/reference/tsxReactEmit2.js b/tests/baselines/reference/tsxReactEmit2.js
index cd086062a3c..e73d8b4b6c8 100644
--- a/tests/baselines/reference/tsxReactEmit2.js
+++ b/tests/baselines/reference/tsxReactEmit2.js
@@ -17,9 +17,9 @@ var spreads5 = <div x={p2} {...p1} y={p3}>{p2}</div>;
 
 //// [file.js]
 var __assign = (this && this.__assign) || Object.assign || function(t) {
-    for (var i = 1, n = arguments.length; i < n; i++) {
+    for (var i = 1; i < arguments.length; i++) {
         var s = arguments[i];
-        if (s != null) for (var p in s) if (s.hasOwnProperty(p)) t[p] = s[p];
+        for (var p in s) if (s.hasOwnProperty(p)) t[p] = s[p];
     }
     return t;
 };
diff --git a/tests/baselines/reference/tsxReactEmit4.js b/tests/baselines/reference/tsxReactEmit4.js
index 77350e54750..e1e7384a463 100644
--- a/tests/baselines/reference/tsxReactEmit4.js
+++ b/tests/baselines/reference/tsxReactEmit4.js
@@ -19,9 +19,9 @@ var spread1 = <div {...p} x={0} />;
 
 //// [file.js]
 var __assign = (this && this.__assign) || Object.assign || function(t) {
-    for (var i = 1, n = arguments.length; i < n; i++) {
+    for (var i = 1; i < arguments.length; i++) {
         var s = arguments[i];
-        if (s != null) for (var p in s) if (s.hasOwnProperty(p)) t[p] = s[p];
+        for (var p in s) if (s.hasOwnProperty(p)) t[p] = s[p];
     }
     return t;
 };
diff --git a/tests/baselines/reference/tsxReactEmit5.js b/tests/baselines/reference/tsxReactEmit5.js
index f4176aca387..e969b587c79 100644
--- a/tests/baselines/reference/tsxReactEmit5.js
+++ b/tests/baselines/reference/tsxReactEmit5.js
@@ -24,9 +24,9 @@ var spread1 = <div x='' {...foo} y='' />;
 //// [react-consumer.js]
 "use strict";
 var __assign = (this && this.__assign) || Object.assign || function(t) {
-    for (var i = 1, n = arguments.length; i < n; i++) {
+    for (var i = 1; i < arguments.length; i++) {
         var s = arguments[i];
-        if (s != null) for (var p in s) if (s.hasOwnProperty(p)) t[p] = s[p];
+        for (var p in s) if (s.hasOwnProperty(p)) t[p] = s[p];
     }
     return t;
 };
diff --git a/tests/baselines/reference/tsxReactEmit6.js b/tests/baselines/reference/tsxReactEmit6.js
index 314f1936774..95461e0149f 100644
--- a/tests/baselines/reference/tsxReactEmit6.js
+++ b/tests/baselines/reference/tsxReactEmit6.js
@@ -29,9 +29,9 @@ namespace M {
 //// [file.js]
 //// [react-consumer.js]
 var __assign = (this && this.__assign) || Object.assign || function(t) {
-    for (var i = 1, n = arguments.length; i < n; i++) {
+    for (var i = 1; i < arguments.length; i++) {
         var s = arguments[i];
-        if (s != null) for (var p in s) if (s.hasOwnProperty(p)) t[p] = s[p];
+        for (var p in s) if (s.hasOwnProperty(p)) t[p] = s[p];
     }
     return t;
 };