diff --git a/__tests__/code-gen.spec.ts b/__tests__/code-gen.spec.ts
index 13ab0b8..87b669b 100644
--- a/__tests__/code-gen.spec.ts
+++ b/__tests__/code-gen.spec.ts
@@ -1,6 +1,6 @@
 import test from 'ava'
 import { parse, traverse } from '@babel/core'
-import { createCodeGenerator } from '../dist/code-gen'
+import { createCodeGenerator } from '../src/code-gen'
 import { createScanner } from '../dist/scanner'
 import type { ModuleInfo } from '../src/interface'
 
diff --git a/__tests__/inject.spec.ts b/__tests__/inject.spec.ts
index 59db734..5a457e6 100644
--- a/__tests__/inject.spec.ts
+++ b/__tests__/inject.spec.ts
@@ -1,8 +1,8 @@
 import test from 'ava'
-import { len } from '../dist/shared'
-import { createInjectScript } from '../dist/inject'
-import { jsdelivr } from '../dist/url'
-import type { TrackModule } from '../dist'
+import { len } from '../src/shared'
+import { createInjectScript } from '../src/inject'
+import { jsdelivr } from '../src/url'
+import type { TrackModule } from '../src'
 
 interface MockIIFEMdoule extends TrackModule{
   relativeModule: string
diff --git a/__tests__/shared.spec.ts b/__tests__/shared.spec.ts
index 33be710..167c182 100644
--- a/__tests__/shared.spec.ts
+++ b/__tests__/shared.spec.ts
@@ -1,6 +1,6 @@
 import fsp from 'fs/promises'
 import test from 'ava'
-import { len, lookup } from '../dist/shared'
+import { len, lookup } from '../src/shared'
 
 
 test('len', (t) => {
diff --git a/__tests__/vm.spec.ts b/__tests__/vm.spec.ts
new file mode 100644
index 0000000..fe6b8aa
--- /dev/null
+++ b/__tests__/vm.spec.ts
@@ -0,0 +1,32 @@
+import test from 'ava'
+import { MAX_CONCURRENT, createConcurrentQueue, createVM } from '../src/vm'
+
+test('native vm', async (t) => {
+  const vm = createVM()
+  await vm.run('var nonzzz = \'test plugin\'', { name: 'nonzzz' } as any, (err) => err)
+  t.is(vm.bindings.has('nonzzz'), true)
+})
+
+test('shadow vm', async (t) => {
+  const vm = createVM()
+  await vm.run('window.nonzzz = 123', { name: 'nonzzz' } as any, (err) => err)
+  t.is(vm.bindings.has('nonzzz'), true)
+})
+
+test('throw error in vm', async (t) => {
+  const vm = createVM()
+  await vm.run('throw new Error(\'error\')', { name: 'nonzzz' } as any, (err) => {
+    t.is(err?.message, 'nonzzz')
+  })
+})
+
+test('task queue', async (t) => {
+  const tasks = [() => Promise.resolve(), () => Promise.resolve(), () => Promise.reject(new Error('3'))]
+
+  const queue = createConcurrentQueue(MAX_CONCURRENT)
+  for (const task of tasks) {
+    queue.enqueue(task)
+  }
+  const err = await t.throwsAsync(queue.wait())
+  t.is(err?.message, '3')
+})
diff --git a/docs/URL.md b/docs/URL.md
index 299bddc..cf780f4 100644
--- a/docs/URL.md
+++ b/docs/URL.md
@@ -4,7 +4,7 @@
 
 ```js
 import { cdn } from 'vite-plugin-cdn2'
-import { unpkg } from 'vite-plugin-cdn2/url'
+import { unpkg } from 'vite-plugin-cdn2/url.js'
 
 cdn({url:unpkg,modules:['vue']})
 
diff --git a/example/package.json b/example/package.json
index 9542b90..32a3132 100644
--- a/example/package.json
+++ b/example/package.json
@@ -1,7 +1,7 @@
 {
   "name": "vite-plugin-cdn2-example",
   "scripts": {
-    "dev": "vite",
+    "dev": "set DEBUG=vite-plugin-cdn2 & vite",
     "build": "vite build",
     "preview": "vite preview"
   },
diff --git a/example/vite.config.js b/example/vite.config.js
index 58696d6..005695a 100644
--- a/example/vite.config.js
+++ b/example/vite.config.js
@@ -4,7 +4,7 @@ import vue from '@vitejs/plugin-vue'
 import { VarletUIResolver } from 'unplugin-vue-components/resolvers'
 import Components from 'unplugin-vue-components/vite'
 import { cdn } from 'vite-plugin-cdn2'
-import { unpkg } from 'vite-plugin-cdn2/url'
+import { unpkg } from 'vite-plugin-cdn2/url.js'
 import { compression } from 'vite-plugin-compression2'
 import Inspect from 'vite-plugin-inspect'
 
diff --git a/package.json b/package.json
index a16afd5..4eff996 100644
--- a/package.json
+++ b/package.json
@@ -30,8 +30,8 @@
       "import": "./dist/index.mjs",
       "require": "./dist/index.js"
     },
-    "./url": {
-      "types":"./dist/url.d.ts",
+    "./url.js": {
+      "types": "./dist/url.d.ts",
       "import": "./dist/url.mjs",
       "require": "./dist/url.js"
     },
@@ -39,8 +39,8 @@
   },
   "typesVersions": {
     "*": {
-      "*": [
-        "./dist/*"
+      "url.js": [
+        "./dist/url.d.ts"
       ]
     }
   },
@@ -57,6 +57,7 @@
   "devDependencies": {
     "@rollup/plugin-json": "^6.0.0",
     "@types/babel__core": "^7.20.1",
+    "@types/debug": "^4.1.8",
     "ava": "^5.2.0",
     "c8": "^7.12.0",
     "eslint": "^8.23.1",
@@ -72,6 +73,7 @@
     "@babel/core": "^7.22.5",
     "@rollup/pluginutils": "^5.0.2",
     "@types/estree": "^1.0.1",
+    "debug": "^4.3.4",
     "happy-dom": "^6.0.4",
     "rs-module-lexer": "^1.0.0"
   },
diff --git a/src/code-gen.ts b/src/code-gen.ts
index 9013de5..9245bef 100644
--- a/src/code-gen.ts
+++ b/src/code-gen.ts
@@ -22,7 +22,7 @@ export class CodeGen {
     const modules = Array.from(new Set([...imports.map(i => i.n)]))
     for (const m of modules) {
       if (this.dependencies.has(m)) return true
-      return false
+      continue
     }
     return false
   }
diff --git a/src/index.ts b/src/index.ts
index 4a5da6b..8797f5a 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,5 +1,6 @@
 import { createFilter } from '@rollup/pluginutils'
 import type { Plugin } from 'vite'
+import _debug from 'debug'
 import { createScanner } from './scanner'
 import { createInjectScript } from './inject'
 import { createCodeGenerator } from './code-gen'
@@ -7,6 +8,8 @@ import { isSupportThreads  } from './shared'
 import { jsdelivr } from './url'
 import type { CDNPluginOptions } from './interface'
 
+const debug = _debug('vite-plugin-cdn2')
+
 function cdn(opts: CDNPluginOptions = {}): Plugin {
   const { modules = [], url = jsdelivr, include = /\.(mjs|js|ts|vue|jsx|tsx)(\?.*|)$/, exclude, logLevel = 'warn', resolve: resolver } = opts
   const filter = createFilter(include, exclude)
@@ -20,7 +23,9 @@ function cdn(opts: CDNPluginOptions = {}): Plugin {
       const [isSupport, version] = isSupportThreads()
       try {
         if (!isSupport) throw new Error(`vite-plugin-cdn2 can't work with nodejs ${version}.`)
+        debug('start scanning')
         await scanner.scanAllDependencies()
+        debug('scanning done', scanner.dependencies)
         generator.injectDependencies(scanner.dependencies)
         if (logLevel === 'warn') {
           scanner.failedModules.forEach((errorMessage, name) => config.logger.error(`vite-plugin-cdn2: ${name} ${errorMessage ? errorMessage : 'resolved failed.Please check it.'}`))
diff --git a/src/scanner.ts b/src/scanner.ts
index ece3d1f..c047e1c 100644
--- a/src/scanner.ts
+++ b/src/scanner.ts
@@ -2,7 +2,7 @@ import fsp from 'fs/promises'
 import worker_threads from 'worker_threads'
 import type { MessagePort } from 'worker_threads'
 import { MAX_CONCURRENT, createConcurrentQueue, createVM } from './vm'
-import { is, len, lookup  } from './shared'
+import { _import, is, len, lookup } from './shared'
 import type { IIFEModuleInfo, IModule, ModuleInfo, ResolverFunction, TrackModule } from './interface'
 
 // This file is a simply dependencies scanner.
@@ -10,6 +10,10 @@ import type { IIFEModuleInfo, IModule, ModuleInfo, ResolverFunction, TrackModule
 // we consume all expection modules in the plugin itself.
 // Notice. This file don't handle any logic with script inject.
 
+// TODO
+// We pack this file just to make the test pass. If we migrate to other test framework
+// Don't forget remove it.
+
 interface WorkerData {
     scannerModule: IModule[]
     workerPort: MessagePort
@@ -83,7 +87,7 @@ async function tryResolveModule(
       const code = await fsp.readFile(iifeFilePath, 'utf8')
       Object.assign(meta, { name, version, code, relativeModule: iifeRelativePath, ...rest })
     }
-    const pkg = await import(moduleName)
+    const pkg = await _import(moduleName)
     const keys = Object.keys(pkg)
     // If it's only exports by default
     if (keys.includes('default') && len(keys) !== 1) {
diff --git a/src/shared.ts b/src/shared.ts
index 80a5d1d..2f316e8 100644
--- a/src/shared.ts
+++ b/src/shared.ts
@@ -30,3 +30,7 @@ export function is(condit: boolean, message: string) {
     throw new Error(message)
   }
 }
+
+// TODO 
+// If we find the correct dynamic import handing it should be removed.
+export const _import = new Function('specifier', 'return import(specifier)')
diff --git a/src/vm.ts b/src/vm.ts
index 78c570f..12f2789 100644
--- a/src/vm.ts
+++ b/src/vm.ts
@@ -4,50 +4,51 @@ import { Window } from 'happy-dom'
 import { len } from './shared'
 import type { ModuleInfo } from './interface'
 
+// Normal. Each umd of iife library only export one module. But some libraries don't 
+// follow this principle. They export some variable starting with __ like `Vue`,`Element-Plus`
+// Variables staring with an underscore are private variables by convention and we shouldn't 
+// parse them. If they are mulitple variables then we only take the last.
+
 export function createVM() {
   const bindings: Map<string, ModuleInfo>  = new Map()
   const window = new Window()
   const context = vm.createContext({})
-  let _meta: ModuleInfo = null
-  let id = 0
-  let callerId = 0
 
   const updateBindings  = (name: string, meta: ModuleInfo) => {
     bindings.set(meta.name, { ...meta, global: name }) 
   }
   const shadow = new Proxy(window, {
     set(target, key: string, value, receiver) {
-      callerId++
-      if (id === callerId) updateBindings(key, _meta)
       Reflect.set(target, key, value, receiver)
       return true
     }
   })
 
   const run = (code: string, meta: ModuleInfo, handler: (err: Error)=> void) => {
-    _meta = meta
     try {
       vm.runInContext(code, context)
-      // TODO
-      // This is a temporary solution.
-      // when vm run script it can't run others logic in threads it will directly
-      // end the function.
-      // So we need to get the last one using the tag.
       // https://github.com/nodejs/help/issues/1378
-      id = len(Object.keys(context))
+      const c = Object.keys(context)
       Object.assign(shadow, context)
+      let last = c.pop()
+      while (last.startsWith('__')) {
+        last = c.pop()
+      }
+      updateBindings(last, meta)
       // context free
       for (const key in context) {
         Reflect.deleteProperty(context, key)
       }
-      _meta = null
-      callerId = 0
-      id = 0
     } catch (error) {
       try {
         // In most cases there will only be one variable
         window.eval(code)
-        updateBindings(Object.keys(shadow).pop(), meta)
+        const c = Object.keys(shadow)
+        let last = c.pop()
+        while (last.startsWith('__')) {
+          last = c.pop()
+        }
+        updateBindings(last, meta)
       } catch (_) {
         handler(new Error(meta.name))        
       }
diff --git a/tsup.config.ts b/tsup.config.ts
index 1e75ec2..c16740d 100644
--- a/tsup.config.ts
+++ b/tsup.config.ts
@@ -1,7 +1,7 @@
 import type { Options } from 'tsup'
 
 export const tsup: Options = {
-  entry: ['src/*.ts'],
+  entry: ['src/index.ts', 'src/url.ts', 'src/scanner.ts'],
   format: ['cjs', 'esm'],
   dts: true,
   splitting: true,
diff --git a/yarn.lock b/yarn.lock
index 8f76759..6c13d81 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -531,6 +531,13 @@
   dependencies:
     "@types/node" "*"
 
+"@types/debug@^4.1.8":
+  version "4.1.8"
+  resolved "https://registry.yarnpkg.com/@types/debug/-/debug-4.1.8.tgz#cef723a5d0a90990313faec2d1e22aee5eecb317"
+  integrity sha512-/vPO1EPOs306Cvhwv7KfVfYvOJqA/S/AXjaHQiJboCZzcNDb+TIJFN9/2C9DZ//ijSKWioNyUxD792QmDJ+HKQ==
+  dependencies:
+    "@types/ms" "*"
+
 "@types/estree@^1.0.0", "@types/estree@^1.0.1":
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/@types/estree/-/estree-1.0.1.tgz#aa22750962f3bf0e79d753d3cc067f010c95f194"
@@ -553,6 +560,11 @@
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.11.tgz#d421b6c527a3037f7c84433fd2c4229e016863d3"
   integrity sha512-wOuvG1SN4Us4rez+tylwwwCV1psiNVOkJeM3AUWUNWg/jDQY2+HE/444y5gc+jBmRqASOm2Oeh5c1axHobwRKQ==
 
+"@types/ms@*":
+  version "0.7.31"
+  resolved "https://registry.yarnpkg.com/@types/ms/-/ms-0.7.31.tgz#31b7ca6407128a3d2bbc27fe2d21b345397f6197"
+  integrity sha512-iiUgKzV9AuaEkZqkOLDIvlQiL6ltuZd9tGcW3gwpnX8JbuiuhFlEGmmFXEXkN50Cvq7Os88IY2v0dkDqXYWVgA==
+
 "@types/node@*":
   version "18.15.11"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-18.15.11.tgz#b3b790f09cb1696cffcec605de025b088fa4225f"