diff --git a/package.json b/package.json
index fe4aaa8..4fcad37 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
   },
   "scripts": {
     "dev": "tsx src",
-    "build": "tsup",
+    "build": "tsup-node",
     "prepack": "pnpm build"
   },
   "keywords": [],
diff --git a/src/index.ts b/src/index.ts
index 0047dba..00e51fb 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,17 +1,23 @@
-#!/bin/env node
+#!/usr/bin/env node
 
 import { program } from 'commander'
 import chalk from 'chalk'
 import { PropertiesSchema } from './schema'
 import prettier from 'prettier'
 import fs from 'fs'
-import { getPropertyType, propertyTypes } from './types'
+import { getPropertyType } from './types'
 import path from 'path'
 
 await program.parseAsync()
 
 const url = program.args[0]
 
+if (!url) {
+  console.error(chalk.red('Usage: adofai-typegen <url>'))
+
+  process.exit(1)
+}
+
 console.log(chalk.blue`Fetching properties json`)
 
 const data: PropertiesSchema = await (await fetch(url)).json()