diff --git a/app.js b/app.js
index 4c27cc73..f5e629f4 100644
--- a/app.js
+++ b/app.js
@@ -122,6 +122,7 @@ function init(mod) {
     mod.add(serveWasm);
     mod.add(serveCode);
     mod.add(fullpath({
+        "/boot"            : redir((pre??"") + "/boot/", 301),
         "/kiri"            : redir((pre??"") + "/kiri/", 301),
         "/mesh"            : redir((pre??"") + "/mesh/", 301),
         "/meta"            : redir((pre??"") + "/meta/", 301),
@@ -147,6 +148,7 @@ function init(mod) {
     mod.static("/mesh/", "web/mesh");
     mod.static("/moto/", "web/moto");
     mod.static("/kiri/", "web/kiri");
+    mod.static("/boot/", "web/boot");
 
     // module loader
     function load_modules(root, force) {
diff --git a/bin/bundle.config.json b/bin/bundle.config.json
new file mode 100644
index 00000000..655fa67e
--- /dev/null
+++ b/bin/bundle.config.json
@@ -0,0 +1,11 @@
+{
+    "outputs": {
+      "bundle": "./web/kiri/bundle.bin"
+    },
+    "inputs": [
+      { "root": "./web", "prefix": "" },
+      { "root": "./src", "prefix": "lib" },
+      { "root": "./src/wasm", "prefix": "wasm" },
+      { "root": "./src/wasm", "prefix": "lib/kiri/wasm" }
+    ]
+}
diff --git a/bin/bundler.mjs b/bin/bundler.mjs
new file mode 100644
index 00000000..199f4d45
--- /dev/null
+++ b/bin/bundler.mjs
@@ -0,0 +1,80 @@
+import fs from 'fs';
+import path from 'path';
+import { Buffer } from 'buffer';
+
+const cfg = JSON.parse(fs.readFileSync(process.argv[2] || './bundle.config.json', 'utf8'));
+
+// --- recursive directory walker (follows symlinks safely) ---
+function* walk(dir, seen = new Set()) {
+    const real = fs.realpathSync(dir);
+    if (seen.has(real)) {
+        return;
+    }
+    seen.add(real);
+
+    for (const name of fs.readdirSync(dir)) {
+        const p = path.join(dir, name);
+        let st;
+        try { st = fs.statSync(p); } catch { continue; }
+        if (st.isDirectory()) yield* walk(p, seen);
+        else yield p;
+    }
+}
+
+// --- collect all files according to config ---
+let entries = [];
+for (const input of cfg.inputs) {
+    const root = input.root;
+    const prefix = input.prefix || '';
+    for (const file of walk(root)) {
+        const rel = path.relative(root, file).replace(/\\/g, '/');
+        const virt = prefix ? `${prefix}/${rel}` : rel;
+        entries.push({ file, virt });
+    }
+}
+
+// --- build header and data ---
+const dataParts = [];
+const entryMeta = [];
+let offset = 0;
+
+for (const { file, virt } of entries) {
+    const data = fs.readFileSync(file);
+    entryMeta.push({ virt, offset, length: data.length });
+    dataParts.push(data);
+    offset += data.length;
+}
+
+// temporary header without offsets to measure total size
+let tempHeaderParts = [];
+for (const { virt, offset, length } of entryMeta) {
+    const name = Buffer.from(virt, 'utf8');
+    const nlen = Buffer.alloc(2); nlen.writeUInt16LE(name.length);
+    const offb = Buffer.alloc(4); offb.writeUInt32LE(0); // placeholder
+    const lenb = Buffer.alloc(4); lenb.writeUInt32LE(length);
+    tempHeaderParts.push(nlen, name, offb, lenb);
+}
+const count = Buffer.alloc(4); count.writeUInt32LE(entries.length);
+const tempHeader = Buffer.concat([count, ...tempHeaderParts]);
+const headerSize = tempHeader.length; // true data offset base
+
+// now rebuild header with correct absolute offsets
+let headerParts = [];
+for (const { virt, offset, length } of entryMeta) {
+    const name = Buffer.from(virt, 'utf8');
+    const nlen = Buffer.alloc(2); nlen.writeUInt16LE(name.length);
+    const offb = Buffer.alloc(4); offb.writeUInt32LE(headerSize + offset);
+    const lenb = Buffer.alloc(4); lenb.writeUInt32LE(length);
+    headerParts.push(nlen, name, offb, lenb);
+    console.log(virt);
+}
+
+const header = Buffer.concat([count, ...headerParts]);
+const full = Buffer.concat([header, ...dataParts]);
+
+// --- write final bundle ---
+const outPath = cfg.outputs.bundle || './bundle.bin';
+fs.mkdirSync(path.dirname(outPath), { recursive: true });
+fs.writeFileSync(outPath, full); // ⚡ write raw binary
+
+console.log(`✅ Bundled ${entries.length} files → ${outPath} (${full.length} bytes)`);
diff --git a/src/main/service.js b/src/main/service.js
index 6d8af693..80db6047 100644
--- a/src/main/service.js
+++ b/src/main/service.js
@@ -11,8 +11,9 @@ async function start_service_worker() {
     debug('service worker registration');
 
     try {
-        // const reg = await navigator.serviceWorker.register("/src/moto/service.js?013", { scope: "/" });
-        const reg = await navigator.serviceWorker.register("/code/service.js?"+version, { scope: "/" });
+        const reg = await navigator
+            .serviceWorker
+            .register(`/code/service.js?${version}`, { scope: "/" });
         if (reg.installing) {
             debug('service worker installing');
         } else if (reg.waiting) {
@@ -31,4 +32,6 @@ async function start_service_worker() {
     }
 }
 
-if (service_worker && self.enable_service) start_service_worker();
+if (service_worker && self.enable_service) {
+    start_service_worker();
+}