diff --git a/package.json b/package.json
index 73c9452..b74d39d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cjs2esmodule",
-  "version": "0.1.0",
+  "version": "1.0.0",
   "main": "lib/index.js",
   "description": "将commonjs转为es module，可在vite中使用，也可直接转换文件",
   "license": "MIT",
diff --git a/src/scripts.ts b/src/scripts.ts
index 4bacafc..e5b4fac 100644
--- a/src/scripts.ts
+++ b/src/scripts.ts
@@ -1,7 +1,7 @@
 import { readFile, createWriteStream } from 'fs'
 import glob from 'glob'
 import { relative } from 'path'
-import { transformFileBase } from './utils/base'
+import { isCjsFile, transformFileBase } from './utils/base'
 
 const ROOT = process.cwd()
 
@@ -13,7 +13,7 @@ function _transformFiles(pattern) {
       files && files.forEach(file => {
         const filename = relative(ROOT, file,)
         readFile(filename, (err, content) => {
-          if (content) {
+          if (content && isCjsFile(content.toString())) {
             const str = content.toString();
             const { code } = transformFileBase(str)
             createWriteStream(filename).write(code)