Today npm_link_all_packages(name) can be used to specify:

• the link_root_name in .aspect_rules_js/{link_root_name}/package_key
• the :{link_root_name}/package_name

This allows multiple npm repositories (lockfiles) to be linked into the same directory - multiple npm_link_all_packages invocations in the same BUILD. This feature is most likely never or rarely used, yet causes many strings to be constructed dynamically.