A utility for saving shrinkwrapped npm packages away and installing them later.
npm shrinkwrap then downloads the required package
tarballs for safe keeping. At deployment time shrinkwrapper calls
npm install to install your dependencies using local package tarballs rather than
the npm registry.
It makes deployments fast (no need to download tarballs) and reliable (deploy
even if npm is down), without changing the way you use
npm at other times or
requiring the use of a private npm registry/proxy.
Shrinkwrapper operates by temporarily adjusting the 'resolved' references in
npm-shrinkwrap.json file to refer to local package tarballs (which are
automatically served from a local HTTP server) at deployment time.
$ npm install -g shrinkwrapper
To lock down your dependencies (i.e.
npm shrinkwrap) and download the
packages to a local package store, run:
To install your dependencies from the local package store at deployment time, run:
$ shrinkwrapper install
Packages are saved to (and installed from) a
packages directory in the root of
your project by default. This can be changed using the
--store flag, or by
adding a shrinkwrapper object to your
package.json as follows: