The code that npm uses to talk to its cache. It handles adding, validating, and removing cached modules, as well as enumerating the cache's contents.

var Cache = require('npm-cache');
var cache = new Cache(config.get('cache'));

var metadata = {
  name    : 'npm-cache',
  version : '0.0.1',
  tarball : './npm-cache-0.0.1.tgz'
};
cache.add(metadata, function (error) {
  // error is any errors that resulted from the addition
  if (error) console.error(error.stack);
});

• callback {Function}
  • error {Error | null}

Initialize the cache, only creating the cache if it does not exist.

• pieces {Array} package specifier (e.g. ["npm-cache", "0.0.1"]).
• depth {Number} Depth to which the listing should enumerate.
• callback {Function}
  • error {Error | null}
  • files {Array} List of paths from the cache.

List the contents of a path in the registry. If no pieces are passed in, enumerate the complete contents of the cache.