For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:lictex_/openSUSE_Tumbleweed/home:lictex_.repo
zypper refresh
zypper install local-npm-registry
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:lictex_/15.5/home:lictex_.repo
zypper refresh
zypper install local-npm-registry
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:lictex_/15.4/home:lictex_.repo
zypper refresh
zypper install local-npm-registry