diff --git a/.github/workflows/ release.yml b/.github/workflows/ release.yml
new file mode 100644
index 0000000..e2b3bd1
--- /dev/null
+++ b/.github/workflows/ release.yml	
@@ -0,0 +1,35 @@
+name: automatic release
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - "!*"
+jobs:
+  release:
+    name: check version and tagging
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: Setup Node.js environment
+        uses: actions/setup-node@v2
+        with:
+          node-version: 13.x
+          registry-url: "https://registry.npmjs.org"
+      - name: install can-npm-publish and dependencies
+        run: |
+          npm install -D can-npm-publish
+          npm ci
+      - name: check version and add tag
+        env:
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+          REPO: ${{github.repository}}
+          COMMIT: ${{github.sha}}
+        run: ./tools/release.sh
+      - name: build
+        run: npm run build
+      - name: release
+        run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
diff --git a/package-lock.json b/package-lock.json
index 39eddfb..4be5f4e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "ts-css-modules-vite-plugin",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
diff --git a/package.json b/package.json
index 0d11389..b5910e5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ts-css-modules-vite-plugin",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "description": "",
   "main": "dist/index.js",
   "scripts": {
diff --git a/src/format.ts b/src/format.ts
new file mode 100644
index 0000000..21b2230
--- /dev/null
+++ b/src/format.ts
@@ -0,0 +1,15 @@
+export const formatClassNames = (classNameKeys: Map<string, boolean>) => {
+  let exportTypes = "",
+    exportClassNames = "export type ClassNames = ";
+  const exportStyle = "export default classNames;";
+  for (const classNameKey of classNameKeys.keys()) {
+    exportTypes = `${exportTypes}\n${formatExportType(classNameKey)}`;
+    exportClassNames =
+      exportClassNames !== "export type ClassNames = "
+        ? `${exportClassNames} | '${classNameKey}'`
+        : `${exportClassNames} '${classNameKey}'`;
+  }
+
+  return `declare const classNames: {${exportTypes}\n};\n${exportStyle}\n${exportClassNames}`;
+};
+const formatExportType = (key: string) => `  readonly '${key}': '${key}';`;
diff --git a/src/index.ts b/src/index.ts
index c87812f..2895a78 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -6,6 +6,7 @@ import { ResolvedConfig } from "vite";
 import { getViteConfig } from "./config";
 import { parseCss } from "./css";
 import { extractClassNameKeys } from "./extract";
+import { formatClassNames } from "./format";
 import { isCSSFile } from "./util";
 
 const factory: ts.server.PluginModuleFactory = (mod: {
@@ -14,11 +15,12 @@ const factory: ts.server.PluginModuleFactory = (mod: {
   const create = (info: ts.server.PluginCreateInfo): ts.LanguageService => {
     // resolve vite.config.ts
     const config: ResolvedConfig | undefined = getViteConfig(__dirname);
-
     const ls = info.languageService;
     const lsh = info.languageServiceHost;
 
-    const formatExportType = (key: string) => `  readonly '${key}': '${key}';`;
+    if (!config) {
+      return ls;
+    }
 
     // オリジナルのメソッドを退避しておく
     const delegate = {
@@ -76,20 +78,9 @@ const factory: ts.server.PluginModuleFactory = (mod: {
             postcssJs.objectify(postcss.parse(css))
           );
 
-          let exportTypes = "",
-            exportClassNames = "export type ClassNames = ";
-          const exportStyle = "export default classNames;";
-          for (const classNameKey of classNameKeys.keys()) {
-            exportTypes = `${exportTypes}\n${formatExportType(classNameKey)}`;
-            exportClassNames =
-              exportClassNames !== "export type ClassNames = "
-                ? `${exportClassNames} | '${classNameKey}'`
-                : `${exportClassNames} '${classNameKey}'`;
-          }
-
-          let outputFileString = "";
-          outputFileString = `declare const classNames: {${exportTypes}\n};\n${exportStyle}\n${exportClassNames}`;
-          scriptSnapshot = ts.ScriptSnapshot.fromString(outputFileString);
+          scriptSnapshot = ts.ScriptSnapshot.fromString(
+            formatClassNames(classNameKeys)
+          );
         }
       }
       return delegate.createLanguageServiceSourceFile(
@@ -109,6 +100,27 @@ const factory: ts.server.PluginModuleFactory = (mod: {
       textChangeRange,
       aggressiveChecks
     ): ts.SourceFile => {
+      const fileName = sourceFile.fileName;
+      if (isCSSFile(fileName)) {
+        if (config) {
+          let css = scriptSnapshot.getText(0, scriptSnapshot.getLength());
+          if (fileName.endsWith(".css")) {
+          } else {
+            try {
+              css = parseCss(css, fileName, config);
+            } catch (e) {
+              log(`${e}`);
+            }
+          }
+          const classNameKeys = extractClassNameKeys(
+            postcssJs.objectify(postcss.parse(css))
+          );
+
+          scriptSnapshot = ts.ScriptSnapshot.fromString(
+            formatClassNames(classNameKeys)
+          );
+        }
+      }
       return delegate.updateLanguageServiceSourceFile(
         sourceFile,
         scriptSnapshot,
diff --git a/tools/ release.sh b/tools/ release.sh
new file mode 100644
index 0000000..b03b687
--- /dev/null
+++ b/tools/ release.sh	
@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# check this version is enable to release or not
+npx can-npm-publish
+if [ $? -eq 1 ] ; then
+  exit 255
+fi
+
+# get current version from package.json
+TAG=$(cat package.json | grep version | cut -d " " -f 4 | tr -d "," | tr -d '"')
+echo "add new tag to GitHub: ${TAG}"
+
+# Add tag to GitHub
+API_URL="https://api.github.com/repos/${REPO}/git/refs"
+
+curl -s -X POST $API_URL \
+  -H "Authorization: token $GITHUB_TOKEN" \
+  -d @- << EOS
+{
+  "ref": "refs/tags/v${TAG}",
+  "sha": "${COMMIT}"
+}
+EOS
\ No newline at end of file