On registry https://registry.npmjs.org/, the "latest" version (v1.2.4) of dependency gulp-minify-css has the following deprecation notice:

Please use gulp-clean-css

Marking the latest version of an npm package as deprecated results in the entire package being considered deprecated, so contact the package author you think this is a mistake.

Affected package file(s): package.json

If you don't care about this, you can close this issue and not be warned about gulp-minify-css's deprecation again. If you would like to completely disable all future deprecation warnings then add the following to your config:

"suppressNotifications": ["deprecationWarningIssues"]