How to try this out:
git clone https://github.com/antimatter15/sqlite-vfs-js
cd sqlite-vfs-js
# Build using Emscripten (via Docker)
make build/os.js
# Now that it has built, run a local webserver
python3 -m http.server 8005
Visit http://localhost:8005/prototype/read.html and open the browser console to see the demo running.