Add typescript

rollup.config.js

@@ -1,4 +1,5 @@
 import resolve from "@rollup/plugin-node-resolve";
+import typescript from "@rollup/plugin-typescript";
 
 export default {
   input: "./src/main.js",
@@ -8,5 +9,5 @@ export default {
       format: "cjs"
     }
   ],
-  plugins: [resolve()]
+  plugins: [resolve(), typescript()]
 };