diff --git a/packages/xen/package.json b/packages/xen/package.json
index 75b2885c..50bae759 100644
--- a/packages/xen/package.json
+++ b/packages/xen/package.json
@@ -1,9 +1,14 @@
 {
   "name": "@strudel.cycles/xen",
-  "version": "0.5.0",
+  "version": "0.6.0",
   "description": "Xenharmonic API for strudel",
   "main": "index.mjs",
+  "publishConfig": {
+    "main": "dist/index.js",
+    "module": "dist/index.mjs"
+  },
   "scripts": {
+    "build": "vite build",
     "test": "vitest run"
   },
   "repository": {
@@ -27,6 +32,7 @@
     "@strudel.cycles/core": "workspace:*"
   },
   "devDependencies": {
+    "vite": "^3.2.2",
     "vitest": "^0.25.7"
   }
 }
diff --git a/packages/xen/vite.config.js b/packages/xen/vite.config.js
new file mode 100644
index 00000000..0fc63a6b
--- /dev/null
+++ b/packages/xen/vite.config.js
@@ -0,0 +1,19 @@
+import { defineConfig } from 'vite';
+import { dependencies } from './package.json';
+import { resolve } from 'path';
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  plugins: [],
+  build: {
+    lib: {
+      entry: resolve(__dirname, 'index.mjs'),
+      formats: ['es', 'cjs'],
+      fileName: (ext) => ({ es: 'index.mjs', cjs: 'index.js' }[ext]),
+    },
+    rollupOptions: {
+      external: [...Object.keys(dependencies)],
+    },
+    target: 'esnext',
+  },
+});
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 629425ae..7ebf8bab 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -283,10 +283,12 @@ importers:
   packages/xen:
     specifiers:
       '@strudel.cycles/core': workspace:*
+      vite: ^3.2.2
       vitest: ^0.25.7
     dependencies:
       '@strudel.cycles/core': link:../core
     devDependencies:
+      vite: 3.2.5
       vitest: 0.25.8
 
   website: