refactor: Replace Webpack with Vite (#53)

src/pages/background/background.ts

@@ -0,0 +1,36 @@
+import { BACKGROUND_MESSAGES } from '@shared/messages';
+import { MessageListener } from 'chrome-extension-toolkit';
+import onInstall from './events/onInstall';
+import onServiceWorkerAlive from './events/onServiceWorkerAlive';
+import onUpdate from './events/onUpdate';
+import browserActionHandler from './handler/browserActionHandler';
+import tabManagementHandler from './handler/tabManagementHandler';
+import userScheduleHandler from './handler/userScheduleHandler';
+
+onServiceWorkerAlive();
+
+/**
+ * will be triggered on either install or update
+ * (will also be triggered on a user's sync'd browsers (on other devices)))
+ */
+chrome.runtime.onInstalled.addListener(details => {
+    switch (details.reason) {
+        case 'install':
+            onInstall();
+            break;
+        case 'update':
+            onUpdate();
+            break;
+        default:
+            break;
+    }
+});
+
+// initialize the message listener that will listen for messages from the content script
+const messageListener = new MessageListener<BACKGROUND_MESSAGES>({
+    ...browserActionHandler,
+    ...tabManagementHandler,
+    ...userScheduleHandler,
+});
+
+messageListener.listen();