diff --git a/package.json b/package.json
index a5affdb..c8a3e86 100644
--- a/package.json
+++ b/package.json
@@ -93,7 +93,7 @@
   "scripts": {
     "lint": "eslint --cache .",
     "lint:fix": "pnpm run lint --fix",
-    "build": "tsup && tsx scripts/postbuild.mts",
+    "build": "tsup",
     "dev": "pnpm run -C playground dev",
     "test": "vitest",
     "release": "bumpp && pnpm publish",
@@ -123,7 +123,7 @@
     "eslint-define-config": "^1.22.0",
     "fast-glob": "^3.3.1",
     "prettier": "^3.0.0",
-    "tsup": "^7.1.0",
+    "tsup": "^7.2.0",
     "tsx": "^3.12.7",
     "typescript": "^5.1.6",
     "vite": "^4.4.8",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 104403b..318af5d 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -70,8 +70,8 @@ importers:
         specifier: ^3.0.0
         version: 3.0.0
       tsup:
-        specifier: ^7.1.0
-        version: 7.1.0(typescript@5.1.6)
+        specifier: ^7.2.0
+        version: 7.2.0(typescript@5.1.6)
       tsx:
         specifier: ^3.12.7
         version: 3.12.7
@@ -4127,8 +4127,8 @@ packages:
     resolution: {integrity: sha512-t0hLfiEKfMUoqhG+U1oid7Pva4bbDPHYfJNiB7BiIjRkj1pyC++4N3huJfqY6aRH6VTB0rvtzQwjM4K6qpfOig==}
     dev: true
 
-  /tsup@7.1.0(typescript@5.1.6):
-    resolution: {integrity: sha512-mazl/GRAk70j8S43/AbSYXGgvRP54oQeX8Un4iZxzATHt0roW0t6HYDVZIXMw0ZQIpvr1nFMniIVnN5186lW7w==}
+  /tsup@7.2.0(typescript@5.1.6):
+    resolution: {integrity: sha512-vDHlczXbgUvY3rWvqFEbSqmC1L7woozbzngMqTtL2PGBODTtWlRwGDDawhvWzr5c1QjKe4OAKqJGfE1xeXUvtQ==}
     engines: {node: '>=16.14'}
     hasBin: true
     peerDependencies:
diff --git a/scripts/postbuild.mts b/scripts/postbuild.mts
deleted file mode 100644
index aaac6cf..0000000
--- a/scripts/postbuild.mts
+++ /dev/null
@@ -1,19 +0,0 @@
-import { basename, dirname, resolve } from 'node:path'
-import { readFile, writeFile } from 'node:fs/promises'
-import { fileURLToPath } from 'node:url'
-import fg from 'fast-glob'
-
-// fix cjs exports
-const files = await fg('*.js', {
-  ignore: ['index.js', 'chunk-*'],
-  absolute: true,
-  cwd: resolve(dirname(fileURLToPath(import.meta.url)), '../dist'),
-})
-for (const file of files) {
-  // eslint-disable-next-line no-console
-  console.log('[postbuild]', basename(file))
-  let code = await readFile(file, 'utf8')
-  code = code.replace('exports.default =', 'module.exports =')
-  code += 'exports.default = module.exports;'
-  await writeFile(file, code)
-}
diff --git a/src/index.ts b/src/index.ts
index 1bc17a1..f047d90 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -8,7 +8,7 @@ declare global {
   const jsxRaw: (variable: any) => any
 }
 
-export default createUnplugin<Options>((options = {}) => {
+export default createUnplugin<Options | undefined, false>((options = {}) => {
   const opt = resolveOption(options)
   const filter = createFilter(opt.include, opt.exclude)
 
diff --git a/tsup.config.ts b/tsup.config.ts
index 0197060..df33511 100644
--- a/tsup.config.ts
+++ b/tsup.config.ts
@@ -1,9 +1,11 @@
 import { defineConfig } from 'tsup'
 
 export default defineConfig({
-  entry: ['./src'],
+  entry: ['./src/*.ts'],
   format: ['cjs', 'esm'],
   target: 'node16.14',
+  splitting: true,
+  cjsInterop: true,
   clean: true,
   dts: true,
 })