The feature has not yet been documented (see: https://github.com/sqldelight/sqldelight/issues/5845) and I am still not sure whether the issue of actually persisting the database has been solved now. Last time I looked it was still an in-memory database but who can tell without any documentation 🤨.
That’s for JS and does not cover the Wasm specifics. If you can figure it out I’d be interested in a working example with wasmJs and persistent database.