Deprecation Warning: 'declaration-property-unit-whitelist' has been deprecated.

[Dominik Schilling]

Deprecation Warning: 'declaration-property-unit-whitelist' has been deprecated. Instead use 'declaration-property-unit-allowed-list'. See: https://github.com/stylelint/stylelint/blob/13.7.0/lib/rules/declaration-property-unit-whitelist/README.md

The rule is defined in stylelint-config-wordpress and is already fixed since WordPress-Coding-Standards/stylelint-config-wordpress#267 but no new version has been release yet, see WordPress-Coding-Standards/stylelint-config-wordpress#268.

The warning can be removed by using

'declaration-property-unit-whitelist': null, // Set to null to disable rule and to avoid deprecation warning.
'declaration-property-unit-allowed-list': {
	'line-height': [ 'px' ],
},

This works in CLI and VSCode, but Atom for some reason produces an Expected option value for rule "declaration-property-unit-allowed-list" 1:1 error.

[Dominik Schilling]

Updating stylelint in the Atom package itself seems to fix the error:

• Go to ~/.atom/packages/linter-stylelint
• Open package.json
• Update dependencies.stylelint to 13.8.0
• Run npm install in ~/.atom/packages/linter-stylelint

[John]

I was getting the stylelint error in Atom: Expected option value for rule "declaration-property-value-disallowed-list", in a 100% completely unrelated project to this, but stumbled upon this solution from a random Google search. Updating linter-stylint's stylelint dependency to 13.8.0, as suggested here, fixed the problem for me. So thanks!