diff --git a/test/form/computed-properties/_expected/iife.js b/test/form/computed-properties/_expected/iife.js
index 35b80af..963508a 100644
--- a/test/form/computed-properties/_expected/iife.js
+++ b/test/form/computed-properties/_expected/iife.js
@@ -7,4 +7,4 @@
 
 	exports.x = x;
 
-}((this.computedProperties = {})));
\ No newline at end of file
+}((this.computedProperties = this.computedProperties || {})));
diff --git a/test/form/computed-properties/_expected/umd.js b/test/form/computed-properties/_expected/umd.js
index 5f7d146..1414460 100644
--- a/test/form/computed-properties/_expected/umd.js
+++ b/test/form/computed-properties/_expected/umd.js
@@ -1,7 +1,7 @@
 (function (global, factory) {
 	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
 	typeof define === 'function' && define.amd ? define(['exports'], factory) :
-	(factory((global.computedProperties = {})));
+	(factory((global.computedProperties = global.computedProperties || {})));
 }(this, function (exports) { 'use strict';
 
 	var foo = 'foo';
@@ -10,4 +10,4 @@
 
 	exports.x = x;
 
-}));
\ No newline at end of file
+}));
diff --git a/test/form/dedupes-external-imports/_expected/iife.js b/test/form/dedupes-external-imports/_expected/iife.js
index 17ed0b7..57e6649 100644
--- a/test/form/dedupes-external-imports/_expected/iife.js
+++ b/test/form/dedupes-external-imports/_expected/iife.js
@@ -30,4 +30,4 @@
 	exports.bar = bar;
 	exports.baz = baz;
 
-}((this.myBundle = {}),external));
+}((this.myBundle = this.myBundle || {}),external));
diff --git a/test/form/dedupes-external-imports/_expected/umd.js b/test/form/dedupes-external-imports/_expected/umd.js
index 70bc301..e33aca8 100644
--- a/test/form/dedupes-external-imports/_expected/umd.js
+++ b/test/form/dedupes-external-imports/_expected/umd.js
@@ -1,7 +1,7 @@
 (function (global, factory) {
 	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('external')) :
 	typeof define === 'function' && define.amd ? define(['exports', 'external'], factory) :
-	(factory((global.myBundle = {}),global.external));
+	(factory((global.myBundle = global.myBundle || {}),global.external));
 }(this, function (exports,external) { 'use strict';
 
 	class Foo extends external.Component {
@@ -33,4 +33,4 @@
 	exports.bar = bar;
 	exports.baz = baz;
 
-}));
\ No newline at end of file
+}));
diff --git a/test/form/export-all-from-internal/_expected/iife.js b/test/form/export-all-from-internal/_expected/iife.js
index b5dad56..8a3cd17 100644
--- a/test/form/export-all-from-internal/_expected/iife.js
+++ b/test/form/export-all-from-internal/_expected/iife.js
@@ -7,4 +7,4 @@
 	exports.a = a;
 	exports.b = b;
 
-}((this.exposedInternals = {})));
+}((this.exposedInternals = this.exposedInternals || {})));
diff --git a/test/form/export-all-from-internal/_expected/umd.js b/test/form/export-all-from-internal/_expected/umd.js
index 74613b4..c1bf8a9 100644
--- a/test/form/export-all-from-internal/_expected/umd.js
+++ b/test/form/export-all-from-internal/_expected/umd.js
@@ -1,7 +1,7 @@
 (function (global, factory) {
 	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
 	typeof define === 'function' && define.amd ? define(['exports'], factory) :
-	(factory((global.exposedInternals = {})));
+	(factory((global.exposedInternals = global.exposedInternals || {})));
 }(this, function (exports) { 'use strict';
 
 	const a = 1;
@@ -10,4 +10,4 @@
 	exports.a = a;
 	exports.b = b;
 
-}));
\ No newline at end of file
+}));
diff --git a/test/form/exports-at-end-if-possible/_expected/iife.js b/test/form/exports-at-end-if-possible/_expected/iife.js
index a0ce6a9..1c5c67b 100644
--- a/test/form/exports-at-end-if-possible/_expected/iife.js
+++ b/test/form/exports-at-end-if-possible/_expected/iife.js
@@ -9,4 +9,4 @@
 
 	exports.FOO = FOO;
 
-}((this.myBundle = {})));
+}((this.myBundle = this.myBundle || {})));
diff --git a/test/form/exports-at-end-if-possible/_expected/umd.js b/test/form/exports-at-end-if-possible/_expected/umd.js
index 20d0d2a..09b2ea6 100644
--- a/test/form/exports-at-end-if-possible/_expected/umd.js
+++ b/test/form/exports-at-end-if-possible/_expected/umd.js
@@ -1,7 +1,7 @@
 (function (global, factory) {
 	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
 	typeof define === 'function' && define.amd ? define(['exports'], factory) :
-	(factory((global.myBundle = {})));
+	(factory((global.myBundle = global.myBundle || {})));
 }(this, function (exports) { 'use strict';
 
 	var FOO = 'foo';
@@ -12,4 +12,4 @@
 
 	exports.FOO = FOO;
 
-}));
\ No newline at end of file
+}));
diff --git a/test/form/multiple-exports/_expected/iife.js b/test/form/multiple-exports/_expected/iife.js
index 3a3975d..d2da90f 100644
--- a/test/form/multiple-exports/_expected/iife.js
+++ b/test/form/multiple-exports/_expected/iife.js
@@ -7,4 +7,4 @@
 	exports.foo = foo;
 	exports.bar = bar;
 
-}((this.myBundle = {})));
+}((this.myBundle = this.myBundle || {})));
diff --git a/test/form/multiple-exports/_expected/umd.js b/test/form/multiple-exports/_expected/umd.js
index 485e381..32d762a 100644
--- a/test/form/multiple-exports/_expected/umd.js
+++ b/test/form/multiple-exports/_expected/umd.js
@@ -1,7 +1,7 @@
 (function (global, factory) {
 	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
 	typeof define === 'function' && define.amd ? define(['exports'], factory) :
-	(factory((global.myBundle = {})));
+	(factory((global.myBundle = global.myBundle || {})));
 }(this, function (exports) { 'use strict';
 
 	var foo = 1;
@@ -10,4 +10,4 @@
 	exports.foo = foo;
 	exports.bar = bar;
 
-}));
\ No newline at end of file
+}));
diff --git a/test/form/namespaced-named-exports/_expected/iife.js b/test/form/namespaced-named-exports/_expected/iife.js
index 2fc75df..69637e9 100644
--- a/test/form/namespaced-named-exports/_expected/iife.js
+++ b/test/form/namespaced-named-exports/_expected/iife.js
@@ -7,4 +7,4 @@ this.foo.bar = this.foo.bar || {};
 
 	exports.answer = answer;
 
-}((this.foo.bar.baz = {})));
+}((this.foo.bar.baz = this.foo.bar.baz || {})));
diff --git a/test/form/namespaced-named-exports/_expected/umd.js b/test/form/namespaced-named-exports/_expected/umd.js
index aeb7775..3717913 100644
--- a/test/form/namespaced-named-exports/_expected/umd.js
+++ b/test/form/namespaced-named-exports/_expected/umd.js
@@ -1,11 +1,11 @@
 (function (global, factory) {
 	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
 	typeof define === 'function' && define.amd ? define(['exports'], factory) :
-	(factory((global.foo = global.foo || {}, global.foo.bar = global.foo.bar || {}, global.foo.bar.baz = {})));
+	(factory((global.foo = global.foo || {}, global.foo.bar = global.foo.bar || {}, global.foo.bar.baz = global.foo.bar.baz || {})));
 }(this, function (exports) { 'use strict';
 
 	var answer = 42;
 
 	exports.answer = answer;
 
-}));
\ No newline at end of file
+}));
diff --git a/test/form/preserves-comments-after-imports/_expected/iife.js b/test/form/preserves-comments-after-imports/_expected/iife.js
index e9338dc..ee4c000 100644
--- a/test/form/preserves-comments-after-imports/_expected/iife.js
+++ b/test/form/preserves-comments-after-imports/_expected/iife.js
@@ -9,4 +9,4 @@
 
 	exports.obj = obj;
 
-}((this.myBundle = {})));
+}((this.myBundle = this.myBundle || {})));
diff --git a/test/form/preserves-comments-after-imports/_expected/umd.js b/test/form/preserves-comments-after-imports/_expected/umd.js
index ac58856..4d34fef 100644
--- a/test/form/preserves-comments-after-imports/_expected/umd.js
+++ b/test/form/preserves-comments-after-imports/_expected/umd.js
@@ -1,7 +1,7 @@
 (function (global, factory) {
 	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
 	typeof define === 'function' && define.amd ? define(['exports'], factory) :
-	(factory((global.myBundle = {})));
+	(factory((global.myBundle = global.myBundle || {})));
 }(this, function (exports) { 'use strict';
 
 	/** A comment for a number */
@@ -12,4 +12,4 @@
 
 	exports.obj = obj;
 
-}));
\ No newline at end of file
+}));