Requires version 2.6.1 or greater. See below if you are using an older version.
To update global packages, type:
npm update -g <package>
For example, to update a packages called jshint, you'd type:
npm update -g jshint
To find out which packages need to be updated, type:
npm outdated -g --depth=0
.
To update all global packages, type:
npm update -g
.
For npm versions less than 2.6.1, run this script to update all outdated global packages.
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https://docs.npmjs.com/getting-started/updating-global-packages