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Thank you for trying it and asking questions. Let me reply to them below.
> Could you give a brief overview of how the project is built, or what libraries are used? I found two in the source, React and Workbox. I've never heard of Workbox before, and I'm still figuring out how service workers are used. But it seems like a big part of the source.
For building, I used Next.js with static generation, not using Server-side rendering. But it's not an important part because it doesn't rely on Next.js features so much.
About Workbox, the app uses them with next-pwa (https://github.com/shadowwalker/next-pwa) for providing caching strategies and offline behavior as Progressive Web App. For example, the app registers several precached files via Workbox. Precached files are fetched and cached by the service worker and these caches can be used while offline. Also, Workbox can configure runtime caching strategies. You can see details in Workbox documentation (https://developer.chrome.com/docs/workbox/).
The app also uses the Service Worker to connect IndexedDB as a local database and send HTTP requests to synchronize data with Google Drive. By using the Service Worker, these methods don't block the user interaction from the main thread and Service Worker can run in the background to synchronize data even if the browser window is suddenly closed.
Currently, I use [Obsidian](https://obsidian.md/) to keep notes and [Syncthing](https://syncthing.net/) to sync them between devices. A major downside of this is that the devices have to be online at the same time for them to sync.
Currently, I use [Obsidian](https://obsidian.md/) to keep notes and [Syncthing](https://syncthing.net/) to sync them between devices. A major downside of this is that the devices have to be online at the same time for them to sync.