That's high on my list, too. The only fear I have is that I won't be able to install packages that no longer exist when I switching machines. But by running

That's high on my list, too. The only fear I have is that I won't be able to install packages that no longer exist when I switching machines. But by running ELM_HOME="$PWD/deps" elm make ... I can get those downloaded into the directories and add them to the VCS.