diff --git a/package.json b/package.json
index 44633fa..417062b 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
     "access": "public",
     "@shopify:registry": "https://registry.npmjs.org/"
   },
-  "version": "0.2.0",
+  "version": "0.1.0",
   "description": "",
   "main": "index.ts",
   "keywords": [],
@@ -18,5 +18,6 @@
     "typescript": "^4.8.4"
   },
   "peerDependencies": {
+    "javy": "^0.1.0"
   }
 }
diff --git a/run.ts b/run.ts
index c3a5740..5ebf344 100644
--- a/run.ts
+++ b/run.ts
@@ -1,22 +1,15 @@
+import * as fs from "javy/fs";
+
 export type ShopifyFunction<Input extends {}, Output extends {}> = (
   input: Input
 ) => Output;
 
-
-interface Javy {
-  JSON: {
-    fromStdin(): any;
-    toStdout(val: any);
-  }
-}
-
-declare global {
-  const Javy: Javy;
-}
-
-
 export default function <I extends {}, O extends {}>(userfunction: ShopifyFunction<I, O>) {
-  const input_obj = Javy.JSON.fromStdin();
+  const input_data = fs.readFileSync(fs.STDIO.Stdin);
+  const input_str = new TextDecoder("utf-8").decode(input_data);
+  const input_obj = JSON.parse(input_str);
   const output_obj = userfunction(input_obj);
-  Javy.JSON.toStdout(output_obj);
+  const output_str = JSON.stringify(output_obj);
+  const output_data = new TextEncoder().encode(output_str);
+  fs.writeFileSync(fs.STDIO.Stdout, output_data);
 }