I just tried installing both @apache-royale/royale-js and @apache-royale/royale-js-swf from npm, and they seem to be missing pretty much everything. I think it's just the npm glue parts.
For reference, here are the file size differences between 0.9.8 and 0.9.9: royale-js 0.9.8 is 158 MB royale-js 0.9.9 is 787 bytes royale-js-swf 0.9.8 is 190 MB royale-js-swf 0.9.9 is 27.2 KB -- Josh Tynjala Bowler Hat LLC <https://bowlerhat.dev>