diff --git a/astro.config.mjs b/astro.config.mjs
index b948974..ce23e35 100644
--- a/astro.config.mjs
+++ b/astro.config.mjs
@@ -1,6 +1,7 @@
 import { defineConfig } from "astro/config";
 import node from "@astrojs/node";
-import cozyBuild from "./src/plugins/cozy-build.ts";
+import { randomUUID } from "node:crypto";
+import serviceWorker from "./src/plugins/astro-sw.ts";
 
 // https://astro.build/config
 export default defineConfig({
@@ -9,6 +10,9 @@ export default defineConfig({
     mode: "middleware"
   }),
   integrations: [
-    cozyBuild()
+    serviceWorker({
+      assetCacheVersionID: randomUUID(),
+      serviceWorkerPath: './src/utils/sw.js'
+    })
   ]
 });
\ No newline at end of file
diff --git a/src/plugins/astro-sw.ts b/src/plugins/astro-sw.ts
new file mode 100644
index 0000000..bbf8b4f
--- /dev/null
+++ b/src/plugins/astro-sw.ts
@@ -0,0 +1,39 @@
+import { AstroIntegration } from 'astro';
+import { readFile, writeFile } from 'node:fs/promises';
+import { fileURLToPath } from 'node:url';
+import path from 'node:path';
+
+let assets: string[] = [];
+
+export type ServiceWorkerConfig = {
+    assetCacheVersionID: string,
+    serviceWorkerPath: string,
+}
+
+export default (config?: ServiceWorkerConfig): AstroIntegration => {
+    const { assetCacheVersionID, serviceWorkerPath } = config ?? {};
+
+    return {
+        'name': 'astro-sw',
+        'hooks': {
+            'astro:build:ssr': ({ manifest }) => {
+                assets = manifest.assets.filter(ass => !ass.includes('sw.js'))
+            },
+            'astro:build:done': async ({ dir }) => {
+                const outFile = fileURLToPath(new URL('./sw.js', dir));
+                let originalScript;
+                try {
+                    const __dirname = path.resolve(path.dirname('.'));
+                    const swPath = path.join(__dirname,serviceWorkerPath ?? '');
+                    console.log('[astro-sw] Using service worker:', swPath);
+                    originalScript = await readFile(swPath);
+                } catch {
+                    throw Error('[astro-sw] ERROR: service worker script not found!')
+                }
+                const assetsDeclaration = `const assets = ${JSON.stringify(assets)};\n`;
+                const versionDeclaration = `const version = ${JSON.stringify(assetCacheVersionID)};\n`;
+                await writeFile(outFile, assetsDeclaration + versionDeclaration + originalScript);
+            }
+        }
+    }
+};
\ No newline at end of file
diff --git a/src/plugins/cozy-build.ts b/src/plugins/cozy-build.ts
deleted file mode 100644
index d167373..0000000
--- a/src/plugins/cozy-build.ts
+++ /dev/null
@@ -1,37 +0,0 @@
-import { AstroIntegration } from 'astro';
-import { readFile, writeFile } from 'node:fs/promises';
-import { fileURLToPath } from 'node:url';
-import path from 'node:path';
-
-let assets: string[] = [];
-
-function getBuildTime() {
-    const today = new Date();
-    const dd = String(today.getDate()).padStart(2, '0');
-    const mm = String(today.getMonth() + 1).padStart(2, '0'); //January is 0!
-    const yyyy = today.getFullYear();
-    const time = today.getTime();
-
-    return mm + dd + yyyy + time;
-}
-
-
-const config: AstroIntegration = {
-    'name': 'astro-cozy-build',
-    'hooks': {
-        'astro:build:ssr': ({ manifest }) => {
-            assets = manifest.assets.filter(ass => !ass.includes('sw.js'))
-            console.log('build-cozy', assets)
-        },
-        'astro:build:done': async ({ dir }) => {
-            const outFile = fileURLToPath(new URL('./sw.js', dir));
-            const __dirname = path.resolve(path.dirname('.'));
-            const originalScript = await readFile(__dirname + '/src/plugins/sw.js');
-            const assetsDeclaration = `const assets = ${JSON.stringify(assets)};\n`;
-            const versionDeclaration = `const version = ${JSON.stringify(getBuildTime())};\n`;
-            await writeFile(outFile, assetsDeclaration + versionDeclaration  + originalScript);
-        }
-    }
-}
-
-export default (): AstroIntegration => config;
\ No newline at end of file
diff --git a/src/plugins/sw.js b/src/utils/sw.js
similarity index 96%
rename from src/plugins/sw.js
rename to src/utils/sw.js
index 3a7a8c5..ea52fc2 100644
--- a/src/plugins/sw.js
+++ b/src/utils/sw.js
@@ -1,4 +1,9 @@
 
+/**
+ * TODO: create virtual imports for `version` & `assets`
+ *  - currently injected by ../plugins/astro-sw.ts
+ */
+
 const cacheName = 'cozy-reader-app-v' + (version ?? '000')
 const addResourcesToCache = async (resources) => {
     const cache = await caches.open(cacheName);