diff --git a/package.json b/package.json
index d6b000d..3f65ad2 100644
--- a/package.json
+++ b/package.json
@@ -23,6 +23,7 @@
   "types": "./dist/index.d.ts",
   "exports": {
     ".": "./dist/index.js",
+    "./register": "./dist/register.js",
     "./package.json": "./package.json"
   },
   "publishConfig": {
diff --git a/src/api.ts b/src/api.ts
new file mode 100644
index 0000000..41350d8
--- /dev/null
+++ b/src/api.ts
@@ -0,0 +1,31 @@
+import module from 'node:module'
+import process from 'node:process'
+import type { Data } from './loader/index.ts'
+import type { MessageLog } from './loader/rpc.ts'
+
+export function register(): void {
+  if (!module.register) {
+    throw new Error(
+      `This version of Node.js (${process.version}) does not support module.register(). Please upgrade to Node v18.19 or v20.6 and above.`,
+    )
+  }
+
+  const { port1, port2 } = new MessageChannel()
+  const data: Data = {
+    port: port2,
+  }
+  const transferList = [port2]
+  module.register('./loader/index.js', {
+    parentURL: import.meta.url,
+    data,
+    transferList,
+  })
+
+  port1.on('message', (message: MessageLog) => {
+    switch (message.type) {
+      case 'log':
+        console.info('[port log]', message.message)
+    }
+  })
+  port1.unref()
+}
diff --git a/src/index.ts b/src/index.ts
index ee0fbcc..de642ad 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,7 +1,7 @@
 import type { UnloaderConfig } from './loader/config.ts'
 
 export * from './plugin.ts'
-export * from './register.ts'
+export * from './api.ts'
 export * from './loader/config.ts'
 
 export function defineConfig(config: UnloaderConfig): UnloaderConfig {
diff --git a/src/register.ts b/src/register.ts
index 41350d8..8baf16f 100644
--- a/src/register.ts
+++ b/src/register.ts
@@ -1,31 +1,2 @@
-import module from 'node:module'
-import process from 'node:process'
-import type { Data } from './loader/index.ts'
-import type { MessageLog } from './loader/rpc.ts'
-
-export function register(): void {
-  if (!module.register) {
-    throw new Error(
-      `This version of Node.js (${process.version}) does not support module.register(). Please upgrade to Node v18.19 or v20.6 and above.`,
-    )
-  }
-
-  const { port1, port2 } = new MessageChannel()
-  const data: Data = {
-    port: port2,
-  }
-  const transferList = [port2]
-  module.register('./loader/index.js', {
-    parentURL: import.meta.url,
-    data,
-    transferList,
-  })
-
-  port1.on('message', (message: MessageLog) => {
-    switch (message.type) {
-      case 'log':
-        console.info('[port log]', message.message)
-    }
-  })
-  port1.unref()
-}
+import { register } from './api'
+register()
diff --git a/tsdown.config.ts b/tsdown.config.ts
index 5da3577..7112327 100644
--- a/tsdown.config.ts
+++ b/tsdown.config.ts
@@ -1,7 +1,7 @@
 import { defineConfig } from 'tsdown'
 
 export default defineConfig({
-  entry: ['./src/index.ts', './src/loader/index.ts'],
+  entry: ['./src/index.ts', './src/register.ts', './src/loader/index.ts'],
   format: 'esm',
   target: 'node18.19',
   clean: true,