I think use case of shelljs and this zx is more for developers who need to perform file system and subprocess operations but rather stay away from bash or other footgun-ridden shells and instead write things in safe code with access to richer data types and more libraries.

bashojs seem to start in the other end, add js statement-execution to shells and and yet another pipeline-language in the mix. More like AWK with js-syntax.

Looks good as a "jq" on steroids but i wouldn't compare it to shelljs.