I use it and it works great. The only thing I'm missing is support for trim_blocks and lstrip_blocks. Without this my templates are a dashes in curly braces {%- -%} hell.
Use the nunjucks js all the time! Really works so well and the performance is insane. Render 20 plus just in time in a React Lowdefy app and no lagging. Would love to see a performance benchmark for a wasm version of this!