diff --git a/bun.lock b/bun.lock
index db7d3d711..e50663af4 100644
--- a/bun.lock
+++ b/bun.lock
@@ -134,6 +134,7 @@
       "devDependencies": {
         "oxlint": "^1.51.0",
         "publint": "^0.3.18",
+        "tsdown": "^0.21.0",
         "typescript": "^5.9.3",
         "vitest": "^4.0.18",
       },
@@ -151,6 +152,7 @@
         "publint": "^0.3.18",
         "react": "^19.2.4",
         "react-dom": "^19.2.4",
+        "tsdown": "^0.21.0",
         "typescript": "^5.9.3",
         "vite": "^7.0.0",
         "wxt": "workspace:*",
diff --git a/packages/is-background/package.json b/packages/is-background/package.json
index 6ca5f3bfc..10922502f 100644
--- a/packages/is-background/package.json
+++ b/packages/is-background/package.json
@@ -17,6 +17,7 @@
   "devDependencies": {
     "oxlint": "^1.51.0",
     "publint": "^0.3.18",
+    "tsdown": "^0.21.0",
     "typescript": "^5.9.3",
     "vitest": "^4.0.18"
   },
diff --git a/packages/module-react/package.json b/packages/module-react/package.json
index ee91d65fe..9523f9d99 100644
--- a/packages/module-react/package.json
+++ b/packages/module-react/package.json
@@ -61,6 +61,7 @@
     "publint": "^0.3.18",
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
+    "tsdown": "^0.21.0",
     "typescript": "^5.9.3",
     "vite": "^7.0.0",
     "wxt": "workspace:*"