style(pwa): use 2 spaces indentation for sw.js and swcache.js

assets/js/data/swcache.js

@@ -1,6 +1,5 @@
 ---
 layout: compress
-
 # The list to be cached by PWA
 ---
 

assets/js/pwa/sw.js

@@ -28,19 +28,19 @@ function isExcluded(url) {
   return false;
 }
 
-self.addEventListener('install', event => {
+self.addEventListener('install', (event) => {
   event.waitUntil(
-        caches.open(cacheName).then(cache => {
+    caches.open(cacheName).then((cache) => {
       return cache.addAll(resource);
     })
   );
 });
 
-self.addEventListener('activate', event => {
+self.addEventListener('activate', (event) => {
   event.waitUntil(
-        caches.keys().then(keyList => {
+    caches.keys().then((keyList) => {
       return Promise.all(
-                keyList.map(key => {
+        keyList.map((key) => {
           if (key !== cacheName) {
             return caches.delete(key);
           }
@@ -56,28 +56,28 @@ self.addEventListener('message', (event) => {
   }
 });
 
-self.addEventListener('fetch', event => {
+self.addEventListener('fetch', (event) => {
   event.respondWith(
-        caches.match(event.request).then(response => {
+    caches.match(event.request).then((response) => {
       if (response) {
         return response;
       }
 
-            return fetch(event.request).then(response => {
+      return fetch(event.request).then((response) => {
         const url = event.request.url;
 
-                if (event.request.method !== 'GET' ||
+        if (
+          event.request.method !== 'GET' ||
           !verifyDomain(url) ||
-                    isExcluded(url)) {
+          isExcluded(url)
+        ) {
           return response;
         }
 
-                /*
-                  see: <https://developers.google.com/web/fundamentals/primers/service-workers#cache_and_return_requests>
-                */
+        /* see: <https://developers.google.com/web/fundamentals/primers/service-workers#cache_and_return_requests> */
         let responseToCache = response.clone();
 
-                caches.open(cacheName).then(cache => {
+        caches.open(cacheName).then((cache) => {
           /* console.log('[sw] Caching new resource: ' + event.request.url); */
           cache.put(event.request, responseToCache);
         });
@@ -87,4 +87,3 @@ self.addEventListener('fetch', event => {
     })
   );
 });
-