> you're going to hit some bumps if you haul an old code out of the vault and try to fire it up on a new system. Most package managers have lockfiles that allo

> you're going to hit some bumps if you haul an old code out of the vault and try to fire it up on a new system. Most package managers have lockfiles that allow for some degree of determinism. Of course if a library introduces breaking changes you're going to have to rewrite, but only when explicitly upgrading the dependency.