diff --git a/build.js b/build.ts
similarity index 87%
rename from build.js
rename to build.ts
index 2d6fbe7..3b66b82 100644
--- a/build.js
+++ b/build.ts
@@ -1,22 +1,22 @@
 const fs = require("fs").promises;
 
-const removeCommon = (text) => {
+const removeCommon = (text: string) => {
   const regex = /:root[\s\S]*?@-webkit-keyframes/;
   return text.replace(regex, "@-webkit-keyframes");
 };
 
-const removeWebkitKeyframes = (text) => {
+const removeWebkitKeyframes = (text: string) => {
   const regex =
     /@-webkit-keyframes\s+[\w-]+\s*\{[^{}]*?(?:\{[^{}]*?\}[^{}]*?)*\}/g;
   return text.replace(regex, "");
 };
 
-const removeCSSClass = (text) => {
+const removeCSSClass = (text: string) => {
   const regex = /\.[\w-]+(?:\.[\w-]+)*\s*\{[^{}]*?(?:\{[^{}]*?\}[^{}]*?)*\}/g;
   return text.replace(regex, "");
 };
 
-const convertCSSKeyframesToJS = (text) => {
+const convertCSSKeyframesToJS = (text: string) => {
   const regex = /@keyframes\s+(\w+)\s*\{([^{}]*?(?:\{[^{}]*?\}[^{}]*?)*)\}/g;
 
   let result;
diff --git a/package.json b/package.json
index 5f25ba8..cf2c506 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "styled-components-animatecss",
   "title": "Styled Components Animatecss",
   "description": "Extract and convert keyframes from animate.css into a JavaScript module that can be imported and used with styled-components.",
-  "version": "1.0.2",
+  "version": "1.0.3",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "repository": {
@@ -31,7 +31,7 @@
     "styled-components": "*"
   },
   "scripts": {
-    "build": "node build.js && swc index.ts -d dist && tsc",
+    "build": "tsc ./build.ts && node build.js && swc index.ts -d dist && tsc",
     "prepublishOnly": "yarn build"
   }
 }