diff --git a/templates/service-worker.js b/templates/service-worker.js
index cccb12a5..dcffa322 100644
--- a/templates/service-worker.js
+++ b/templates/service-worker.js
@@ -1,78 +1,84 @@
-const timestamp = '__timestamp__';
-const ASSETS = `cache${timestamp}`;
+const timestamp = '__timestamp__'
+const ASSETS = `cache${timestamp}`
 
 // `shell` is an array of all the files generated by webpack,
 // `assets` is an array of everything in the `assets` directory
-const to_cache = __shell__.concat(__assets__);
-const cached = new Set(to_cache);
+const to_cache = __shell__.concat(__assets__)
+const cached = new Set(to_cache)
 
 // `routes` is an array of `{ pattern: RegExp }` objects that
 // match the pages in your app
-const routes = __routes__;
+const routes = __routes__
 
 self.addEventListener('install', event => {
-	event.waitUntil(
-		caches
-			.open(ASSETS)
-			.then(cache => cache.addAll(to_cache))
-			.then(() => {
-				self.skipWaiting();
-			})
-	);
-});
+  event.waitUntil(
+    caches
+      .open(ASSETS)
+      .then(cache => cache.addAll(to_cache))
+      .then(() => {
+        self.skipWaiting()
+      })
+  )
+})
 
 self.addEventListener('activate', event => {
-	event.waitUntil(
-		caches.keys().then(async keys => {
-			// delete old caches
-			for (const key of keys) {
-				if (key !== ASSETS) await caches.delete(key);
-			}
+  event.waitUntil(
+    caches.keys().then(async keys => {
+      // delete old caches
+      for (const key of keys) {
+        if (key !== ASSETS) {
+          await caches.delete(key)
+        }
+      }
 
-			await self.clients.claim();
-		})
-	);
-});
+      await self.clients.claim()
+    })
+  )
+})
 
 self.addEventListener('fetch', event => {
-	const url = new URL(event.request.url);
+  const url = new URL(event.request.url)
 
-	// don't try to handle e.g. data: URIs
-	if (!url.protocol.startsWith('http')) return;
+  // don't try to handle e.g. data: URIs
+  if (!url.protocol.startsWith('http')) {
+  	return
+  }
 
-	// always serve assets and webpack-generated files from cache
-	if (cached.has(url.pathname)) {
-		event.respondWith(caches.match(event.request));
-		return;
-	}
+  // always serve assets and webpack-generated files from cache
+  if (cached.has(url.pathname)) {
+    event.respondWith(caches.match(event.request))
+    return
+  }
 
-	// for pages, you might want to serve a shell `index.html` file,
-	// which Sapper has generated for you. It's not right for every
-	// app, but if it's right for yours then uncomment this section
-	/*
-	if (url.origin === self.origin && routes.find(route => route.pattern.test(url.pathname))) {
-		event.respondWith(caches.match('/index.html'));
-		return;
-	}
-	*/
+  // for pages, you might want to serve a shell `index.html` file,
+  // which Sapper has generated for you. It's not right for every
+  // app, but if it's right for yours then uncomment this section
 
-	// for everything else, try the network first, falling back to
-	// cache if the user is offline. (If the pages never change, you
-	// might prefer a cache-first approach to a network-first one.)
-	event.respondWith(
-		caches
-			.open(`offline${timestamp}`)
-			.then(async cache => {
-				try {
-					const response = await fetch(event.request);
-					cache.put(event.request, response.clone());
-					return response;
-				} catch(err) {
-					const response = await cache.match(event.request);
-					if (response) return response;
+  if (url.origin === self.origin && routes.find(route => route.pattern.test(url.pathname))) {
+    event.respondWith(caches.match('/index.html'));
+    return;
+  }
 
-					throw err;
-				}
-			})
-	);
-});
+
+  // for everything else, try the network first, falling back to
+  // cache if the user is offline. (If the pages never change, you
+  // might prefer a cache-first approach to a network-first one.)
+  event.respondWith(
+    caches
+      .open(`offline${timestamp}`)
+      .then(async cache => {
+        try {
+          const response = await fetch(event.request)
+          cache.put(event.request, response.clone())
+          return response
+        } catch (err) {
+          const response = await cache.match(event.request)
+          if (response) {
+            return response
+          }
+
+          throw err
+        }
+      })
+  )
+})