如何在 bash 中抑制 npm WARN 已弃用的消息

Question

I have several version of node.js installed in Linux Mint 18.0. I manage them using nvm . Because of a project dependency, I need to have version 0.10 as the default version ( nvm use 0.10 ). As a result of this, every time I start my terminal, I get the following output:

npm WARN deprecated This version of npm lacks support for important features,
npm WARN deprecated such as scoped packages, offered by the primary npm
npm WARN deprecated registry. Consider upgrading to at least npm@2, if not the
npm WARN deprecated latest stable version. To upgrade to npm@2, run:
npm WARN deprecated 
npm WARN deprecated   npm -g install npm@latest-2
npm WARN deprecated 
npm WARN deprecated To upgrade to the latest stable version, run:
npm WARN deprecated 
npm WARN deprecated   npm -g install npm@latest
npm WARN deprecated 
npm WARN deprecated (Depending on how Node.js was installed on your system, you
npm WARN deprecated may need to prefix the preceding commands with `sudo`, or if
npm WARN deprecated on Windows, run them from an Administrator prompt.)
npm WARN deprecated 
npm WARN deprecated If you're running the version of npm bundled with
npm WARN deprecated Node.js 0.10 LTS, be aware that the next version of 0.10 LTS
npm WARN deprecated will be bundled with a version of npm@2, which has some small
npm WARN deprecated backwards-incompatible changes made to `npm run-script` and
npm WARN deprecated semver behavior.

How do I suppress these messages?

Answer 1

You can suppress or quieten NPM via an environment variable:

npm_config_loglevel=silent npm version

This should work in your .bashrc (or wherever you invoke nvm ):

npm_config_loglevel=silent nvm use 0.10

Or you can set the environment variable globally

export npm_config_loglevel=silent

Different loglevels can be found here - they are:

"silent", "error", "warn", "http", "info", "verbose", "silly"

Answer 2

You can also add .npmrc file in your project, user directory or globally. The four relevant files are:

• per-project config file (/path/to/my/project/.npmrc)
• per-user config file (~/.npmrc)
• global config file ($PREFIX/etc/npmrc)
• npm builtin config file (/path/to/npm/npmrc)

Example:

prefix=~/.npm-global
loglevel=error

More information here

Answer 3

You can do this inside your script by removing the event listeners

#!/usr/bin/env node

process.removeAllListeners('warning');

// Do your thang without triggering warnings

All credit to Sam Roberts: https://github.com/nodejs/node/issues/32876#issuecomment-616709931

Answer 4

Update 2021:

(My problem was not an npm WARN deprecated message but an npm WARN npm message, but this still applies)

I use npm v8 on Ubuntu, and I also use nvm v0.33.11. For personal reasons I have to use node 14 instead of the current version, node 16.

My solution to suppress this:

npm WARN npm npm does not support Node.js v14.4.0
npm WARN npm You should probably upgrade to a newer version of node as we
npm WARN npm cannot make any promises that npm will work with this version.
npm WARN npm You can find the latest version at https://nodejs.org/

In file $HOME/.nvm/nvm.sh

in line ~ 2155 I change this

   NVM_NPM_PREFIX="$(npm config --loglevel=warn get prefix)"

to this

   NVM_NPM_PREFIX="$(npm config --loglevel=silent get prefix)"

In addition (perhaps this is optional), I've also changed $HOME/.nvm/.npmrc where I've added this line

loglevel=silent

as proposed in other answers here in this SO post.