diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3c3629e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+node_modules
diff --git a/package.json b/package.json
index 5855c9d..657bf9f 100644
--- a/package.json
+++ b/package.json
@@ -4,5 +4,8 @@
   "main": "index.js",
   "repository": "https://github.com/mato533/test1.git",
   "author": "mato533 <neo_universe_84@yahoo.co.jp>",
-  "license": "MIT"
+  "license": "MIT",
+  "devDependencies": {
+    "typescript": "^5.1.3"
+  }
 }
diff --git a/yarn.lock b/yarn.lock
new file mode 100644
index 0000000..606fa6a
--- /dev/null
+++ b/yarn.lock
@@ -0,0 +1,8 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+typescript@^5.1.3:
+  version "5.1.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-5.1.3.tgz#8d84219244a6b40b6fb2b33cc1c062f715b9e826"
+  integrity sha512-XH627E9vkeqhlZFQuL+UsyAXEnibT0kWR2FWONlr4sTjvxyJYnyefgrkyECLzM5NenmKzRAy2rR/OlYLA1HkZw==