It seems indeed very nice, the examples are clear and everything works from async. I tried with Deno, and now experimenting with my own VFS.
It does seem to suffer from maintainer problems too though, and I don't blame Roy Hashimoto for that. I wouldn't want to maintain such an obvious wrapper when it should be a task for SQLite's team to upstream the changes.
Roy Hashimoto doesn't want to maintain it as an NPM package for instance, as it is just an experiment: https://github.com/rhashimoto/wa-sqlite/issues/12
"Low traffic is a happy place - I don't have any motivation to mess with that."