• Load the actual installed graph
• Diff the list of edges/nodes
• Extract all the nodes into place
  • the rest are just a straightforward packageInfo.extract(spec, target)
• Link into each importer
• Run scripts on deps in topological-ish order, in this sequence:
  • preinstall for all nodes, prepare and then preinstall for git nodes
  • install for all nodes
  • postinstall for all nodes
• Kick off detached background job to remove deleted nodes

Track all changes, and roll back on failure.

• no lockfile, no node_modules
• lockfile, no node_modules
• node_modules, no lockfile
• lockfiles and node_modules

Depends On:

• [FEATURE] buildIdealGraph #75