feat(client): 翻訳をIndexedDBに保存・プッシュ通知を翻訳 (#6396)

* wip

* tabun ok

* better msg

* oops

* fix lint

* Update gulpfile.ts

Co-authored-by: Acid Chicken (硫酸鶏) <root@acid-chicken.com>

* Update src/client/scripts/set-i18n-contexts.ts

Co-authored-by: Acid Chicken (硫酸鶏) <root@acid-chicken.com>

* refactor

Co-authored-by: acid-chicken <root@acid-chicken.com>

* ✨

* wip

* fix lint

* たぶんおk

* fix flush

* Translate Notification

* remove console.log

* fix

* add notifications

* remove san

* wip

* ok

* ✌️

* Update src/prelude/array.ts

Co-authored-by: Acid Chicken (硫酸鶏) <root@acid-chicken.com>

* wip

* i18n refactor

* Update init.ts

* ✌️

Co-authored-by: Acid Chicken (硫酸鶏) <root@acid-chicken.com>
Co-authored-by: syuilo <syuilotan@yahoo.co.jp>

src/client/sw.ts

@@ -0,0 +1,67 @@
+/**
+ * Service Worker
+ */
+declare var self: ServiceWorkerGlobalScope;
+
+import composeNotification from './scripts/compose-notification';
+
+// eslint-disable-next-line no-undef
+const version = _VERSION_;
+const cacheName = `mk-cache-${version}`;
+
+const apiUrl = `${location.origin}/api/`;
+
+// インストールされたとき
+self.addEventListener('install', ev => {
+	console.info('installed');
+
+	ev.waitUntil(
+		caches.open(cacheName)
+			.then(cache => {
+				return cache.addAll([
+					`/?v=${version}`
+				]);
+			})
+			.then(() => self.skipWaiting())
+	);
+});
+
+self.addEventListener('activate', ev => {
+	ev.waitUntil(
+		caches.keys()
+			.then(cacheNames => Promise.all(
+				cacheNames
+					.filter((v) => v !== cacheName)
+					.map(name => caches.delete(name))
+			))
+			.then(() => self.clients.claim())
+	);
+});
+
+self.addEventListener('fetch', ev => {
+	if (ev.request.method !== 'GET' || ev.request.url.startsWith(apiUrl)) return;
+	ev.respondWith(
+		caches.match(ev.request)
+			.then(response => {
+				return response || fetch(ev.request);
+			})
+			.catch(() => {
+				return caches.match(`/?v=${version}`);
+			})
+	);
+});
+
+// プッシュ通知を受け取ったとき
+self.addEventListener('push', ev => {
+	// クライアント取得
+	ev.waitUntil(self.clients.matchAll({
+		includeUncontrolled: true
+	}).then(async clients => {
+		// クライアントがあったらストリームに接続しているということなので通知しない
+		if (clients.length != 0) return;
+
+		const { type, body } = ev.data.json();
+
+		return self.registration.showNotification(...(await composeNotification(type, body)));
+	}));
+});