'extends: eslint:recommended' causes *all* rules to be considered used

Take the following minimal .eslintrc.yaml:

extends: eslint:recommended

When I run eslint-find-rules -c .eslintrc.yaml it dumps a list of every eslint rule, which is extremely unhelpful.

I think the problem here is that eslint:recommended is implemented by setting the value for non-recommended rules to off instead of leaving them out. The only workaround I can think of for this is to explicitly mask out eslint:recommended and then later fill them back in. However, this seems like a bit of a bodge; is there a better way to do this?

The alternative is to add a flag such as --off-is-unused to consider any rules which have been turned off to be unused. Of course, that would prevent rules from being removed from the list.

[ljharb]

I think that if you want the recommended set to only list the rules it’s enabling, that perhaps that’s a change that should be made upstream in eslint itself?

[ta2edchimp]

Definitely.

But as I do not have the perfect idea about how to approach this, I’d recommend to use eslint-diff-rules in verbose mode as a workaround in the meanwhile:

eslint-diff-rules [your own config] ./node_modles/eslint/conf/eslint-recommended.js -v