diff --git a/airplay-worker.js b/airplay-worker.js
new file mode 100644
index 0000000..219e4df
--- /dev/null
+++ b/airplay-worker.js
@@ -0,0 +1,16 @@
+const {
+  Worker,
+  isMainThread,
+  parentPort,
+  workerData,
+} = require("node:worker_threads");
+var { WebSocketServer } = require("ws");
+const wss = new WebSocketServer({ port: 8980 });
+wss.on("connection", function connection(ws) {
+  ws.on("message", function message(data) {
+    parentPort.postMessage({ message: data });
+  });
+  parentPort.on("message", (data) => {
+    ws.send(data);
+  });
+});
diff --git a/izanami.js b/izanami.js
index 21a7c51..03fd294 100644
--- a/izanami.js
+++ b/izanami.js
@@ -57,19 +57,8 @@ airtunes.on('device', function(key, status, desc) {
   console.log("deviceStatus", key, status, desc);
 })
 
-var func = `
-     const {Worker, isMainThread, parentPort, workerData} = require('node:worker_threads');
-     var { WebSocketServer } = require('ws');
-     const wss = new WebSocketServer({ port: 8980 });
-      wss.on('connection', function connection(ws) {
-        ws.on('message', function message(data) {
-          parentPort.postMessage({message: data});
-        });
-        parentPort.on("message", data => {
-          ws.send(data);
-        });  
-      });`;
-var worker = new Worker(func, {eval: true});    
+
+var worker = new Worker('./airplay-worker.js');    
 worker.on("message", (result) => {
   parsed_data = JSON.parse(ab2str(result.message));
       if (parsed_data.type == "scanDevices") {
diff --git a/scripts/esbuild.cjs b/scripts/esbuild.cjs
index bb286fc..04515e7 100644
--- a/scripts/esbuild.cjs
+++ b/scripts/esbuild.cjs
@@ -1,15 +1,31 @@
 // @ts-check
 
 async function main() {
+  await require("esbuild").build({
+    entryPoints: ["./airplay-worker.js"],
+    bundle: true,
+    platform: "node",
+    outdir: "dist",
+    external: ["./build"],
+    loader: {
+      ".node": "file",
+    },
+    // minify: true,
+    // minifyIdentifiers: true,
+    sourcemap: true,
+  });
+
   await require("esbuild").build({
     entryPoints: ["./izanami.js"],
     bundle: true,
     platform: "node",
     outdir: "dist",
-    external: ['./build'],
+    external: ["./build"],
     loader: {
-        '.node': 'file',
+      ".node": "file",
     },
+    sourcemap: true,
+
     // minify: true,
     // minifyIdentifiers: true,
   });