idb

https://github.com/jakearchibald/idb is a nice low-level wrapper for IndexDB that promisifies the API without much performance overhead.

Common usecase is mapping database schemas to "this is what SELECTs / INSERTs" should contain. eg https://github.com/jakearchibald/idb Honestly most complicated types boil down to a handful of concepts (mapped types, conditionals, recursion) with a few tricks for working around sharp corners (deferring evaluation for performance, controlling whether a union distributes). I've even seen someone solve 8-queens in types using a formal grammar but no clue how that worked. Speaking of, if anyone else has other examples of defining a grammar or ast in typescript, I'd love to see it.

The IndexedDB API [1] is fairly easy to work with. I personally use idb [2] as a wrapper, but that's optional. The hardest part is getting it neatly integrated with whatever you're using to manage state. I use a centralized Redux-like store to push events to, which then get automatically persisted to Indexed DB. Hope this helps! [1] https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_A... [2] https://github.com/jakearchibald/idb

I've had good experiences with https://github.com/jakearchibald/idb It's basically a promise-based version of the standard API.

I use it on a simple website I built: https://covid19incharts.com This website fetches the Johns Hopkins University COVID-19 data from GitHub (in CSV files), and fetching this every single user action is not feasible. When a user first enters the website, this data is fetched from GitHub, parsed and formatted, and stored in IndexedDB (until it's deemed "stale"). I first used Local Storage, but I needed more space than most browsers allow on Local Storage, so I moved to IndexedDB. By the way, the API of IndexedDB is somewhat awkward, but there are great libraries like IDB (https://github.com/jakearchibald/idb) that make it much more developer-friendly.