source <(npm completion)

Enables tab-completion in all npm commands\.

The synopsis above loads the completions into your current shell\. Adding it to your ~/\.bashrc or ~/\.zshrc will make the completions available everywhere:

npm completion >> ~/\.bashrc
npm completion >> ~/\.zshrc

You may of course also pipe the output of npm completion to a file such as /usr/local/etc/bash_completion\.d/npm or /etc/bash_completion\.d/npm if you have a system that will read that file for you\.

When COMP_CWORD, COMP_LINE, and COMP_POINT are defined in the environment, npm completion acts in "plumbing mode", and outputs completions based on the arguments\.