diff --git a/scripts/build.js b/scripts/build.js
index 904a8af..2377c2d 100644
--- a/scripts/build.js
+++ b/scripts/build.js
@@ -22,7 +22,7 @@ const getGitTagFromGit = async () => {
     ['describe', '--exact-match', '--tags'],
     {
       reject: false,
-    },
+    }
   )
   if (exitCode) {
     if (
@@ -72,8 +72,10 @@ delete packageJson.prettier
 delete packageJson.jest
 packageJson.version = version
 packageJson.main = 'dist/index.js'
+packageJson.types = 'dist/index.d.js'
 
 await writeJson(join(dist, 'package.json'), packageJson)
 
 await cp(join(root, 'README.md'), join(dist, 'README.md'))
 await cp(join(root, 'LICENSE'), join(dist, 'LICENSE'))
+await cp(join(root, 'src', 'main.d.ts'), join(dist, 'dist/index.d.ts'))
diff --git a/src/main.d.ts b/src/main.d.ts
new file mode 100644
index 0000000..c91829b
--- /dev/null
+++ b/src/main.d.ts
@@ -0,0 +1,7 @@
+interface Options {
+  readonly workerPath: string
+  readonly playwrightPath: string
+  readonly threshold: number
+}
+
+export const measureMemory: (options: Options) => Promise<void>
diff --git a/src/main.ts b/src/main.ts
index abfaa99..57c7f37 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,3 +1 @@
-import * as Main from './parts/Main/Main.ts'
-
-Main.main()
+export * from './parts/Main/Main.ts'
diff --git a/src/parts/Main/Main.ts b/src/parts/Main/Main.ts
index 6a56a2e..2779d2b 100644
--- a/src/parts/Main/Main.ts
+++ b/src/parts/Main/Main.ts
@@ -1,16 +1 @@
-import * as MeasureMemory from '../MeasureMemory/MeasureMemory.ts'
-import { parseArgs } from '../ParseArgs/ParseArgs.ts'
-import { root } from '../Root/Root.ts'
-
-export const main = async () => {
-  const options = parseArgs()
-  await MeasureMemory.measureMemory({
-    headless: options.headless,
-    port: options.port,
-    remoteDebuggingPort: '9222',
-    workerPath: 'TODO',
-    playwrightPath: 'TODO',
-    root,
-    threshold: 400_000,
-  })
-}
+export * from '../MeasureMemory/MeasureMemory.ts'
diff --git a/src/parts/MeasureMemory/MeasureMemory.ts b/src/parts/MeasureMemory/MeasureMemory.ts
index e0a1f12..1febf6b 100644
--- a/src/parts/MeasureMemory/MeasureMemory.ts
+++ b/src/parts/MeasureMemory/MeasureMemory.ts
@@ -1,53 +1,24 @@
-import { MemoryLimitExceededError } from '../Errors/Errors.ts'
-import { getMemoryUsageWs } from '../GetMemoryUsageWs/GetMemoryUsageWs.ts'
-import { launchBrowser } from '../LaunchBrowser/LaunchBrowser.ts'
-import { startServer } from '../Server/Server.ts'
-import { waitForWorkerReady } from '../WaitForWorkerReady/WaitForWorkerReady.ts'
+import * as MeasureMemoryInternal from '../MeasureMemoryInternal/MeasureMemoryInternal.ts'
+import { parseArgs } from '../ParseArgs/ParseArgs.ts'
+import { root } from '../Root/Root.ts'
 
 export const measureMemory = async ({
   workerPath,
-  port,
-  headless,
-  remoteDebuggingPort,
-  root,
   playwrightPath,
   threshold,
 }: {
   workerPath: string
-  port: number
-  headless: boolean
-  remoteDebuggingPort: string
-  root: string
   playwrightPath: string
   threshold: number
 }) => {
-  if (process.platform === 'win32') {
-    // not supported
-    return
-  }
-
-  const server = await startServer(port, workerPath, root)
-
-  const { page, browser } = await launchBrowser(
-    headless,
-    remoteDebuggingPort,
+  const options = parseArgs()
+  await MeasureMemoryInternal.measureMemoryInternal({
+    headless: options.headless,
+    port: options.port,
+    remoteDebuggingPort: '9222',
+    workerPath,
     playwrightPath,
-  )
-
-  try {
-    await page.goto(`http://localhost:${port}`)
-    await waitForWorkerReady(page)
-
-    const memoryUsage = await getMemoryUsageWs(remoteDebuggingPort)
-    console.log('[memory] Worker Memory Usage:', memoryUsage)
-    if (memoryUsage.usedSize >= threshold) {
-      throw new MemoryLimitExceededError(threshold, memoryUsage.usedSize)
-    }
-  } catch (error) {
-    console.error('[memory] Measurement failed:', error)
-    process.exit(1)
-  } finally {
-    server.close()
-    await browser.close()
-  }
+    root,
+    threshold,
+  })
 }
diff --git a/src/parts/MeasureMemoryInternal/MeasureMemoryInternal.ts b/src/parts/MeasureMemoryInternal/MeasureMemoryInternal.ts
new file mode 100644
index 0000000..f56fd54
--- /dev/null
+++ b/src/parts/MeasureMemoryInternal/MeasureMemoryInternal.ts
@@ -0,0 +1,53 @@
+import { MemoryLimitExceededError } from '../Errors/Errors.ts'
+import { getMemoryUsageWs } from '../GetMemoryUsageWs/GetMemoryUsageWs.ts'
+import { launchBrowser } from '../LaunchBrowser/LaunchBrowser.ts'
+import { startServer } from '../Server/Server.ts'
+import { waitForWorkerReady } from '../WaitForWorkerReady/WaitForWorkerReady.ts'
+
+export const measureMemoryInternal = async ({
+  workerPath,
+  port,
+  headless,
+  remoteDebuggingPort,
+  root,
+  playwrightPath,
+  threshold,
+}: {
+  workerPath: string
+  port: number
+  headless: boolean
+  remoteDebuggingPort: string
+  root: string
+  playwrightPath: string
+  threshold: number
+}) => {
+  if (process.platform === 'win32') {
+    // not supported
+    return
+  }
+
+  const server = await startServer(port, workerPath, root)
+
+  const { page, browser } = await launchBrowser(
+    headless,
+    remoteDebuggingPort,
+    playwrightPath
+  )
+
+  try {
+    await page.goto(`http://localhost:${port}`)
+    await waitForWorkerReady(page)
+
+    const memoryUsage = await getMemoryUsageWs(remoteDebuggingPort)
+    console.log('[memory] Worker Memory Usage:', memoryUsage)
+    if (memoryUsage.usedSize >= threshold) {
+      throw new MemoryLimitExceededError(threshold, memoryUsage.usedSize)
+    }
+  } catch (error) {
+    console.error('[memory] Measurement failed:', error)
+    process.exit(1)
+  } finally {
+    server.close()
+    await browser.close()
+  }
+}
diff --git a/test/Main.test.ts b/test/Main.test.ts
index e0d3ac1..e89db4e 100644
--- a/test/Main.test.ts
+++ b/test/Main.test.ts
@@ -2,5 +2,5 @@ import { expect, test } from '@jest/globals'
 import * as Main from '../src/parts/Main/Main.ts'
 
 test('main', () => {
-  expect(typeof Main.main).toBe('function')
+  expect(typeof Main.measureMemory).toBe('function')
 })