Print information about deprecated subdependencies

[zkochan]

Discussed in #4217

^{Originally posted by sindzicat January 11, 2022}
Hello!

I use node.js 16 on Windows 10.

When I install gulp using pnpm I see the following:

λ pnpm add gulp
Packages: +294
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Packages are hard linked from the content-addressable store to the virtual store.
  Content-addressable store is at: P:\.pnpm-store\v3
  Virtual store is at:             node_modules/.pnpm
Progress: resolved 298, reused 295, downloaded 2, added 294, done

dependencies:
+ gulp 4.0.2
Already up-to-date
Progress: resolved 1, reused 1, downloaded 0, added 0, done

But when I use npm to install gulp I see additional info:

λ npm install gulp
npm WARN deprecated chokidar@2.1.8: Chokidar 2 will break on node v14+. Upgrade to chokidar 3 with 15x less dependencies.
npm WARN deprecated resolve-url@0.2.1: https://github.com/lydell/resolve-url#deprecated
npm WARN deprecated urix@0.1.0: Please see https://github.com/lydell/urix#deprecated
...

I see, that gulp.watch() won't work on Node.js 16 because gulp still uses chokidar 2.

I used pnpm to install gulp and didn't see such message. As result I was need a whole week to find why gulp.watch() don't work.

How to turn on such warnings in pnpm?