Seconded; it's a fantastic tool and ecosystem. We use sql.js in production (https://www.executeprogram.com). The SQL course's live code examples all run directly in the browser via sql.js.
I initially had low expectations because it's such a weird use case, but it's been totally reliable. We did have to ignore a few types of errors from old browsers that don't support wasm properly, but we've never had a bug in current browsers caused by sql.js.
I initially had low expectations because it's such a weird use case, but it's been totally reliable. We did have to ignore a few types of errors from old browsers that don't support wasm properly, but we've never had a bug in current browsers caused by sql.js.