diff --git a/__tests__/visitor/allow-modules-with-content/output.tsx b/__tests__/visitor/allow-modules-with-content/output.tsx
index ee8342a..961be46 100644
--- a/__tests__/visitor/allow-modules-with-content/output.tsx
+++ b/__tests__/visitor/allow-modules-with-content/output.tsx
@@ -17,12 +17,15 @@ export function Test() {
     </TailwindProvider>
   );
 }
-Object.assign(
-  globalThis.tailwindcss_react_native_style,
+globalThis.tailwindcss_react_native_style = Object.assign(
+  globalThis.tailwindcss_react_native_style || {},
   StyleSheet.create({
     "font-bold": {
       fontWeight: "700",
     },
   })
 );
-Object.assign(globalThis.tailwindcss_react_native_media, {});
+globalThis.tailwindcss_react_native_media = Object.assign(
+  globalThis.tailwindcss_react_native_media || {},
+  {}
+);
diff --git a/__tests__/visitor/allow-modules/output.tsx b/__tests__/visitor/allow-modules/output.tsx
index c709f15..3257c4e 100644
--- a/__tests__/visitor/allow-modules/output.tsx
+++ b/__tests__/visitor/allow-modules/output.tsx
@@ -15,8 +15,8 @@ export function Test() {
     </TailwindProvider>
   );
 }
-Object.assign(
-  globalThis.tailwindcss_react_native_style,
+globalThis.tailwindcss_react_native_style = Object.assign(
+  globalThis.tailwindcss_react_native_style || {},
   StyleSheet.create({
     container: {
       width: "100%",
@@ -41,12 +41,15 @@ Object.assign(
     },
   })
 );
-Object.assign(globalThis.tailwindcss_react_native_media, {
-  container: [
-    [["media", "(min-width: 640px)"]],
-    [["media", "(min-width: 768px)"]],
-    [["media", "(min-width: 1024px)"]],
-    [["media", "(min-width: 1280px)"]],
-    [["media", "(min-width: 1536px)"]],
-  ],
-});
+globalThis.tailwindcss_react_native_media = Object.assign(
+  globalThis.tailwindcss_react_native_media || {},
+  {
+    container: [
+      [["media", "(min-width: 640px)"]],
+      [["media", "(min-width: 768px)"]],
+      [["media", "(min-width: 1024px)"]],
+      [["media", "(min-width: 1280px)"]],
+      [["media", "(min-width: 1536px)"]],
+    ],
+  }
+);
diff --git a/__tests__/visitor/basic-tw/output.tsx b/__tests__/visitor/basic-tw/output.tsx
index 74b1180..a005053 100644
--- a/__tests__/visitor/basic-tw/output.tsx
+++ b/__tests__/visitor/basic-tw/output.tsx
@@ -13,8 +13,8 @@ export function Test() {
     </TailwindProvider>
   );
 }
-Object.assign(
-  globalThis.tailwindcss_react_native_style,
+globalThis.tailwindcss_react_native_style = Object.assign(
+  globalThis.tailwindcss_react_native_style || {},
   StyleSheet.create({
     container: {
       width: "100%",
@@ -39,12 +39,15 @@ Object.assign(
     },
   })
 );
-Object.assign(globalThis.tailwindcss_react_native_media, {
-  container: [
-    [["media", "(min-width: 640px)"]],
-    [["media", "(min-width: 768px)"]],
-    [["media", "(min-width: 1024px)"]],
-    [["media", "(min-width: 1280px)"]],
-    [["media", "(min-width: 1536px)"]],
-  ],
-});
+globalThis.tailwindcss_react_native_media = Object.assign(
+  globalThis.tailwindcss_react_native_media || {},
+  {
+    container: [
+      [["media", "(min-width: 640px)"]],
+      [["media", "(min-width: 768px)"]],
+      [["media", "(min-width: 1024px)"]],
+      [["media", "(min-width: 1280px)"]],
+      [["media", "(min-width: 1536px)"]],
+    ],
+  }
+);
diff --git a/__tests__/visitor/basic/output.tsx b/__tests__/visitor/basic/output.tsx
index d226f99..15ead5a 100644
--- a/__tests__/visitor/basic/output.tsx
+++ b/__tests__/visitor/basic/output.tsx
@@ -13,8 +13,8 @@ export function Test() {
     </TailwindProvider>
   );
 }
-Object.assign(
-  globalThis.tailwindcss_react_native_style,
+globalThis.tailwindcss_react_native_style = Object.assign(
+  globalThis.tailwindcss_react_native_style || {},
   StyleSheet.create({
     container: {
       width: "100%",
@@ -39,12 +39,15 @@ Object.assign(
     },
   })
 );
-Object.assign(globalThis.tailwindcss_react_native_media, {
-  container: [
-    [["media", "(min-width: 640px)"]],
-    [["media", "(min-width: 768px)"]],
-    [["media", "(min-width: 1024px)"]],
-    [["media", "(min-width: 1280px)"]],
-    [["media", "(min-width: 1536px)"]],
-  ],
-});
+globalThis.tailwindcss_react_native_media = Object.assign(
+  globalThis.tailwindcss_react_native_media || {},
+  {
+    container: [
+      [["media", "(min-width: 640px)"]],
+      [["media", "(min-width: 768px)"]],
+      [["media", "(min-width: 1024px)"]],
+      [["media", "(min-width: 1280px)"]],
+      [["media", "(min-width: 1536px)"]],
+    ],
+  }
+);
diff --git a/__tests__/visitor/block-modules/output.tsx b/__tests__/visitor/block-modules/output.tsx
index 4f5f882..84736bd 100644
--- a/__tests__/visitor/block-modules/output.tsx
+++ b/__tests__/visitor/block-modules/output.tsx
@@ -12,12 +12,15 @@ export function Test() {
     </>
   );
 }
-Object.assign(
-  globalThis.tailwindcss_react_native_style,
+globalThis.tailwindcss_react_native_style = Object.assign(
+  globalThis.tailwindcss_react_native_style || {},
   StyleSheet.create({
     "font-bold": {
       fontWeight: "700",
     },
   })
 );
-Object.assign(globalThis.tailwindcss_react_native_media, {});
+globalThis.tailwindcss_react_native_media = Object.assign(
+  globalThis.tailwindcss_react_native_media || {},
+  {}
+);
diff --git a/__tests__/visitor/className-expression/output.tsx b/__tests__/visitor/className-expression/output.tsx
index 752fb89..f99133e 100644
--- a/__tests__/visitor/className-expression/output.tsx
+++ b/__tests__/visitor/className-expression/output.tsx
@@ -14,8 +14,8 @@ export function Test({ isBold, isUnderline }) {
     </TailwindProvider>
   );
 }
-Object.assign(
-  globalThis.tailwindcss_react_native_style,
+globalThis.tailwindcss_react_native_style = Object.assign(
+  globalThis.tailwindcss_react_native_style || {},
   StyleSheet.create({
     "font-bold": {
       fontWeight: "700",
@@ -25,4 +25,7 @@ Object.assign(
     },
   })
 );
-Object.assign(globalThis.tailwindcss_react_native_media, {});
+globalThis.tailwindcss_react_native_media = Object.assign(
+  globalThis.tailwindcss_react_native_media || {},
+  {}
+);
diff --git a/__tests__/visitor/compile-only/output.tsx b/__tests__/visitor/compile-only/output.tsx
index fe7c143..7c739ca 100644
--- a/__tests__/visitor/compile-only/output.tsx
+++ b/__tests__/visitor/compile-only/output.tsx
@@ -10,8 +10,8 @@ export function Test() {
     </TailwindProvider>
   );
 }
-Object.assign(
-  globalThis.tailwindcss_react_native_style,
+globalThis.tailwindcss_react_native_style = Object.assign(
+  globalThis.tailwindcss_react_native_style || {},
   StyleSheet.create({
     container: {
       width: "100%",
@@ -36,12 +36,15 @@ Object.assign(
     },
   })
 );
-Object.assign(globalThis.tailwindcss_react_native_media, {
-  container: [
-    [["media", "(min-width: 640px)"]],
-    [["media", "(min-width: 768px)"]],
-    [["media", "(min-width: 1024px)"]],
-    [["media", "(min-width: 1280px)"]],
-    [["media", "(min-width: 1536px)"]],
-  ],
-});
+globalThis.tailwindcss_react_native_media = Object.assign(
+  globalThis.tailwindcss_react_native_media || {},
+  {
+    container: [
+      [["media", "(min-width: 640px)"]],
+      [["media", "(min-width: 768px)"]],
+      [["media", "(min-width: 1024px)"]],
+      [["media", "(min-width: 1280px)"]],
+      [["media", "(min-width: 1536px)"]],
+    ],
+  }
+);
diff --git a/__tests__/visitor/content-directory-no-index/output.tsx b/__tests__/visitor/content-directory-no-index/output.tsx
index f647216..6c5e7c0 100644
--- a/__tests__/visitor/content-directory-no-index/output.tsx
+++ b/__tests__/visitor/content-directory-no-index/output.tsx
@@ -12,8 +12,8 @@ export function Test() {
     </>
   );
 }
-Object.assign(
-  globalThis.tailwindcss_react_native_style,
+globalThis.tailwindcss_react_native_style = Object.assign(
+  globalThis.tailwindcss_react_native_style || {},
   StyleSheet.create({
     "font-bold": {
       fontWeight: "700",
@@ -23,4 +23,7 @@ Object.assign(
     },
   })
 );
-Object.assign(globalThis.tailwindcss_react_native_media, {});
+globalThis.tailwindcss_react_native_media = Object.assign(
+  globalThis.tailwindcss_react_native_media || {},
+  {}
+);
diff --git a/__tests__/visitor/content-directory/output.tsx b/__tests__/visitor/content-directory/output.tsx
index f647216..6c5e7c0 100644
--- a/__tests__/visitor/content-directory/output.tsx
+++ b/__tests__/visitor/content-directory/output.tsx
@@ -12,8 +12,8 @@ export function Test() {
     </>
   );
 }
-Object.assign(
-  globalThis.tailwindcss_react_native_style,
+globalThis.tailwindcss_react_native_style = Object.assign(
+  globalThis.tailwindcss_react_native_style || {},
   StyleSheet.create({
     "font-bold": {
       fontWeight: "700",
@@ -23,4 +23,7 @@ Object.assign(
     },
   })
 );
-Object.assign(globalThis.tailwindcss_react_native_media, {});
+globalThis.tailwindcss_react_native_media = Object.assign(
+  globalThis.tailwindcss_react_native_media || {},
+  {}
+);
diff --git a/__tests__/visitor/content-ignore-unmatched-relative-import/output.tsx b/__tests__/visitor/content-ignore-unmatched-relative-import/output.tsx
index 9a558ff..b2c1e3a 100644
--- a/__tests__/visitor/content-ignore-unmatched-relative-import/output.tsx
+++ b/__tests__/visitor/content-ignore-unmatched-relative-import/output.tsx
@@ -12,12 +12,15 @@ export function Test() {
     </>
   );
 }
-Object.assign(
-  globalThis.tailwindcss_react_native_style,
+globalThis.tailwindcss_react_native_style = Object.assign(
+  globalThis.tailwindcss_react_native_style || {},
   StyleSheet.create({
     "font-bold": {
       fontWeight: "700",
     },
   })
 );
-Object.assign(globalThis.tailwindcss_react_native_media, {});
+globalThis.tailwindcss_react_native_media = Object.assign(
+  globalThis.tailwindcss_react_native_media || {},
+  {}
+);
diff --git a/__tests__/visitor/content-positive-match/output.tsx b/__tests__/visitor/content-positive-match/output.tsx
index ade2571..e9e8e33 100644
--- a/__tests__/visitor/content-positive-match/output.tsx
+++ b/__tests__/visitor/content-positive-match/output.tsx
@@ -12,8 +12,8 @@ export function Test() {
     </>
   );
 }
-Object.assign(
-  globalThis.tailwindcss_react_native_style,
+globalThis.tailwindcss_react_native_style = Object.assign(
+  globalThis.tailwindcss_react_native_style || {},
   StyleSheet.create({
     "font-bold": {
       fontWeight: "700",
@@ -23,4 +23,7 @@ Object.assign(
     },
   })
 );
-Object.assign(globalThis.tailwindcss_react_native_media, {});
+globalThis.tailwindcss_react_native_media = Object.assign(
+  globalThis.tailwindcss_react_native_media || {},
+  {}
+);
diff --git a/__tests__/visitor/empty-className/output.tsx b/__tests__/visitor/empty-className/output.tsx
index af26808..871e20b 100644
--- a/__tests__/visitor/empty-className/output.tsx
+++ b/__tests__/visitor/empty-className/output.tsx
@@ -11,5 +11,11 @@ export function Test() {
     </TailwindProvider>
   );
 }
-Object.assign(globalThis.tailwindcss_react_native_style, StyleSheet.create({}));
-Object.assign(globalThis.tailwindcss_react_native_media, {});
+globalThis.tailwindcss_react_native_style = Object.assign(
+  globalThis.tailwindcss_react_native_style || {},
+  StyleSheet.create({})
+);
+globalThis.tailwindcss_react_native_media = Object.assign(
+  globalThis.tailwindcss_react_native_media || {},
+  {}
+);
diff --git a/__tests__/visitor/existing-style/output.tsx b/__tests__/visitor/existing-style/output.tsx
index daf1e62..f7a6cbf 100644
--- a/__tests__/visitor/existing-style/output.tsx
+++ b/__tests__/visitor/existing-style/output.tsx
@@ -19,12 +19,15 @@ const styles = StyleSheet.create({
     color: "blue",
   },
 });
-Object.assign(
-  globalThis.tailwindcss_react_native_style,
+globalThis.tailwindcss_react_native_style = Object.assign(
+  globalThis.tailwindcss_react_native_style || {},
   StyleSheet.create({
     "font-bold": {
       fontWeight: "700",
     },
   })
 );
-Object.assign(globalThis.tailwindcss_react_native_media, {});
+globalThis.tailwindcss_react_native_media = Object.assign(
+  globalThis.tailwindcss_react_native_media || {},
+  {}
+);
diff --git a/src/babel/transforms/append-variables.ts b/src/babel/transforms/append-variables.ts
index 34de305..eb31854 100644
--- a/src/babel/transforms/append-variables.ts
+++ b/src/babel/transforms/append-variables.ts
@@ -1,10 +1,12 @@
 import {
   arrayExpression,
+  assignmentExpression,
   booleanLiteral,
   callExpression,
   Expression,
   expressionStatement,
   identifier,
+  logicalExpression,
   memberExpression,
   nullLiteral,
   numericLiteral,
@@ -23,30 +25,52 @@ export function appendVariables(body: Statement[], styleRecord: StyleRecord) {
 
   body.push(
     expressionStatement(
-      callExpression(
-        memberExpression(identifier("Object"), identifier("assign")),
-        [
-          memberExpression(
-            identifier("globalThis"),
-            identifier("tailwindcss_react_native_style")
-          ),
-          callExpression(
-            memberExpression(identifier("StyleSheet"), identifier("create")),
-            [serialize(styles)]
-          ),
-        ]
+      assignmentExpression(
+        "=",
+        memberExpression(
+          identifier("globalThis"),
+          identifier("tailwindcss_react_native_style")
+        ),
+        callExpression(
+          memberExpression(identifier("Object"), identifier("assign")),
+          [
+            logicalExpression(
+              "||",
+              memberExpression(
+                identifier("globalThis"),
+                identifier("tailwindcss_react_native_style")
+              ),
+              identifier("{}")
+            ),
+            callExpression(
+              memberExpression(identifier("StyleSheet"), identifier("create")),
+              [serialize(styles)]
+            ),
+          ]
+        )
       )
     ),
     expressionStatement(
-      callExpression(
-        memberExpression(identifier("Object"), identifier("assign")),
-        [
-          memberExpression(
-            identifier("globalThis"),
-            identifier("tailwindcss_react_native_media")
-          ),
-          serialize(media),
-        ]
+      assignmentExpression(
+        "=",
+        memberExpression(
+          identifier("globalThis"),
+          identifier("tailwindcss_react_native_media")
+        ),
+        callExpression(
+          memberExpression(identifier("Object"), identifier("assign")),
+          [
+            logicalExpression(
+              "||",
+              memberExpression(
+                identifier("globalThis"),
+                identifier("tailwindcss_react_native_media")
+              ),
+              identifier("{}")
+            ),
+            serialize(media),
+          ]
+        )
       )
     )
   );