Add ignores configuration object property

[jeddy3]

What is the problem you're trying to solve?

If we lint CSS files by default and add files:[] to the configuration object, it's likely people will reach for ignoreFiles: [] to exclude directories. Its current behaviour is:

Stylelint ignores the node_modules directory by default. However, this is overridden if ignoreFiles is set.

ESLint introduces ignores with their flat config. It has a different behaviour to ignoreFiles: [], i.e. it supports unignoring files through negation rather than removing the defaults.

This feels like a better behaviour as it is less likely people will want to include node_modules.

What solution would you like to see?

Either add a new ignores property with that behaviour and deprecate ignoreFiles: [], or change the ignoreFiles: [] behaviour in a major release. The former feels like it'll give us more wiggle room and can happen in 16.x alongside #3860.

[ybiquitous]

add a new ignores property with that behaviour and deprecate ignoreFiles: []

I agree with the former. 👍🏼