npm uninstalls required dependencies

[ckotzbauer]

I'm opening this issue because:

• npm is crashing.
• npm is producing an incorrect install.
• npm is doing something I don't understand.
• npm is producing incorrect or undesirable behavior.
• Other (see below for feature requests):

What's going wrong?

• Dependencies are removed after making updates of other deps

How can the CLI team reproduce the problem?

• Given I have a clean installation of this project.
• I run npm i stylelint@9.2.1 -D to update this dependency. This seems to be fine.
• I run npm i webpack@4.8.3 -D to update this dependency too. The update is done, but stylelint is removed (not listed in package-lock.json anymore; warning are shown in the cli, cause of unresolved peer-dependencies)

supporting information:

• npm -v prints: 5.6.0 (included with node), 5.10.0 (globally), 6.0.1 (globally)
• node -v prints: 10.1.0
• npm config get registry prints: https://registry.npmjs.org/
• Windows, OS X/macOS, or Linux?: Ubuntu 18.04
• Network issues:
  • Geographic location where npm was run:
  • I use a proxy to connect to the npm registry.
  • I use a proxy to connect to the web.
  • I use a proxy when downloading Git repos.
  • I access the npm registry via a VPN
  • I don't use a proxy, but have limited or unreliable internet access.
• Container:
  • I develop using Vagrant on Windows.
  • I develop using Vagrant on OS X or Linux.
  • I develop / deploy using Docker.
  • I deploy to a PaaS (Triton, Heroku).

Thanks for your investigation!

[seanrmilligan]

I was having similar issues in an Angular project. I had npm@5.6.0 installed because that's what is getting shipped with node.js, still.

Per issue 1739, it was fixed at npm@5.7.1.

Can you ensure that when you run npm install [package] it's being executed with 5.10.0 or 6.0.1 rather than 5.6.0?

[ckotzbauer]

I'm relatively sure, that the correct version was used. But I can verify this again when I'm back from vacation in a few days.

[ckotzbauer]

@seanrmilligan Verified with clean installations with npm 5.6 and 6.1

$ npm -v
5.6.0

$ npm i stylelint@9.2.1 -D
npm WARN @webpack-contrib/config-loader@1.1.1 requires a peer of chalk@^2.1.0 but none is installed. You must install peer dependencies yourself.
npm WARN postcss-html@0.23.7 requires a peer of postcss-syntax@^0.10.0 but none is installed. You must install peer dependencies yourself.
npm WARN postcss-markdown@0.23.7 requires a peer of postcss-syntax@^0.10.0 but none is installed. You must install peer dependencies yourself.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.3 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

+ stylelint@9.2.1
added 13 packages, removed 39 packages, updated 57 packages and moved 1 package in 13.659s

$ npm i webpack@4.8.3 -D
npm WARN @webpack-contrib/config-loader@1.1.1 requires a peer of chalk@^2.1.0 but none is installed. You must install peer dependencies yourself.
npm WARN stylelint-config-recommended@2.1.0 requires a peer of stylelint@^8.3.0 || ^9.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN stylelint-config-standard@18.2.0 requires a peer of stylelint@^8.3.0 || ^9.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.3 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

+ webpack@4.8.3
added 3 packages, removed 187 packages, updated 18 packages and moved 1 package in 23.041s

$ sudo npm -v
6.1.0

$ sudo npm i stylelint@9.2.1 -D
npm WARN @webpack-contrib/config-loader@1.1.1 requires a peer of chalk@^2.1.0 but none is installed. You must install peer dependencies yourself.
npm WARN postcss-markdown@0.23.7 requires a peer of postcss-syntax@^0.10.0 but none is installed. You must install peer dependencies yourself.
npm WARN postcss-html@0.23.7 requires a peer of postcss-syntax@^0.10.0 but none is installed. You must install peer dependencies yourself.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.3 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

+ stylelint@9.2.1
added 13 packages from 6 contributors, removed 39 packages, updated 57 packages and moved 1 package in 43.064s

$ npm i webpack@4.8.3 -D
npm WARN rm not removing node_modules/.bin/webpack as it wasn't installed by  node_modules/webpack
npm WARN @webpack-contrib/config-loader@1.1.1 requires a peer of chalk@^2.1.0 but none is installed. You must install peer dependencies yourself.
npm WARN stylelint-config-recommended@2.1.0 requires a peer of stylelint@^8.3.0 || ^9.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN stylelint-config-standard@18.2.0 requires a peer of stylelint@^8.3.0 || ^9.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.3 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

+ webpack@4.8.3
added 3 packages from 3 contributors, removed 187 packages, updated 18 packages and moved 1 package in 56.632s