npx nakedjsx is used to build a NakedJSX project.
It is essentially a thin invocation wrapper around @nakedjsx/core and the official plugins. If it is run on files that belong to a project that itself depends on @nakedjsx/core, then the build will be handled by the project's installation of NakedJSX.
Please report any issues at the @nakedjsx/core issue tracker.