Everywhere I've worked has had a local install of Nexus or Artifactory which acts as a caching proxy in front of Maven Central, as well as being a location to s

Everywhere I've worked has had a local install of Nexus or Artifactory which acts as a caching proxy in front of Maven Central, as well as being a location to store internal builds. Artifactory's pro version can sit in front of pretty much any package repository known to man (NPM, Docker, RPM, APT, Maven, PIP, gem, you name it it's probably in there). NPM makes it quite awkward to use a non-standard repository, and often builds will download stuff from GitHub on-the-fly rather than hosting all their sources in NPM. It's not my favourite package manager :(. But you're going to need to put your own packages somewhere, and there's little reason not to make that somewhere not also cache your external dependencies.