deps/npm/doc/cli/npm-completion.md

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npm-completion(1) -- Tab Completion for npm
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## SYNOPSIS

    . <(npm completion)

## DESCRIPTION

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.

You may of course also pipe the output of npm completion to a file
such as `/usr/local/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.

## SEE ALSO

* npm-developers(7)
* npm-faq(7)
* npm(1)