diff --git a/build.ts b/build.ts
new file mode 100644
index 0000000..77598d2
--- /dev/null
+++ b/build.ts
@@ -0,0 +1,46 @@
+#!/usr/bin/env bun
+import { watch, readFile } from "node:fs/promises"
+
+const postProcess = (str: string): string => {
+    // Unescape unicode charaters
+    str = unescape((str.replace(/\\u/g, '%u')));
+    // Replace \x00 to normal character
+    str = str.replaceAll(/\\x[A-F0-9]{2}/g, (e) => String.fromCharCode(parseInt(e.substring(2), 16)));
+
+    // Replace "globalThis." with "var";
+    str = str.replaceAll('globalThis.', 'var ');
+
+    return str;
+}
+
+const build = (config?: any={}) => {
+	const startTime = performance.now();
+
+	return Bun.build({
+		entrypoints: ['src/index.ts'],
+		outdir: './dist',
+	}).then(async (output) => {
+		if (!output.success) {
+			console.log(output);
+			process.exit(1);
+		}
+		const {path} = output.outputs[0];
+		let result = postProcess(await readFile(path, 'utf-8'));
+		await Bun.write(
+			path,
+			await readFile('src/header.txt', 'utf-8') + result
+		);
+		console.log(`done in ${performance.now() - startTime} ms`);
+	})
+}
+
+const config = {};
+await build(config);
+
+if (!process.argv.includes('--watch')) process.exit(0);
+
+for await (const event of watch('./src', {recursive: true})) {
+	const {filename} = event;
+	console.log(filename)
+	await build(config);
+}
diff --git a/package.json b/package.json
index c41ae1c..de4a4fe 100644
--- a/package.json
+++ b/package.json
@@ -2,10 +2,14 @@
   "name": "better-xcloud",
   "module": "src/index.ts",
   "type": "module",
+  "bin": {
+    "build": "build.ts",
+    "build-watch": "build.ts --watch"
+  },
   "devDependencies": {
     "@types/bun": "latest"
   },
   "peerDependencies": {
     "typescript": "^5.0.0"
   }
-}
\ No newline at end of file
+}
diff --git a/tsconfig.json b/tsconfig.json
index ab942ee..44e9f57 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -26,7 +26,7 @@
     "noFallthroughCasesInSwitch": true,
 
     // Some stricter flags (disabled by default)
-    "noUnusedLocals": false,
+    "noUnusedLocals": true,
     "noUnusedParameters": false,
     "noPropertyAccessFromIndexSignature": false
   }