Couldn't they have compiled sqlite to javascript using emscripten as a websql replacement? sql.js seems to have been started in 2012, and even if it might not

Couldn't they have compiled sqlite to javascript using emscripten as a websql replacement? sql.js seems to have been started in 2012, and even if it might not have been production ready at the time, I'd expect facebook to be able to pull off such a project by themselves.