Install-g NPM | npm.io

install-g -- npm install -g {}

One can insist to automatically npm-install a package globally.

Use

Add install-g to your package.json dependencies.
Add "scripts": { "install": "node_modules/.bin/install-g || true" }

As a result, any package using your package as a dependency would trigger its global installation. Use of devDependencies isn't recommended, unless your project is private. If you publish it on npm and others end up depending on it -- it will not install automatically...

Because the install script is followed by || true, non-zero exitcodes will be ignored. Thus a missing ./node_modules/.bin/install-g won't be a problem. Nor will other possible errors such as the currently usupported sudo cause the install to fail. The error will still print to stderr, but a failed global install will not break the local install. I'm not sure if Windows can take the || true though.

Also note the use of install (i.e. post-install) rather than pre-install. If people run install -g on your package it will install once rather than twice.