Thanks for the PR, @bradzacher!

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Codecov Report

Merging #2768 (40e40c4) into master (c2dde58) will decrease coverage by 0.03%.
The diff coverage is 91.88%.

@@            Coverage Diff             @@
##           master    #2768      +/-   ##
==========================================
- Coverage   92.80%   92.76%   -0.04%     
==========================================
  Files         300      301       +1     
  Lines        9857    10150     +293     
  Branches     2769     2870     +101     
==========================================
+ Hits         9148     9416     +268     
- Misses        332      345      +13     
- Partials      377      389      +12     

Flags with carried forward coverage won't be shown. Click here to find out more.

Hey 👋🏼

Sorry if this is not a correct channel to ask this, I can raise a separate issue as well, just let me know :)

Can you please help out to understand better the relation between this rule, new naming-convnention options and the no-unused-vars-experimental?

https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/no-unused-vars.md
https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/no-unused-vars-experimental.md

Up to 4.7.0 we had to use no-unused-vars-experimental because of the case of const foo = (_myUnusedVar, myUsedVar) => {}, but I see that experimental rule gets no development and wondering if a new unused parameter introduced in #2810 in naming-convention fixes the case.

We currently have this, but as I understand we can change it to some combo of post 4.9.0 non-experimental rules, right?

{
    // While main rules works, it reports errors in places where TS would not complain, like underscored variables e.g. _actions
    // https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/no-unused-vars.md
    //
    // Experimental rule seems to be aligned better with TS itself
    // https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/no-unused-vars-experimental.md
    'no-unused-vars': [OFF],
    '@typescript-eslint/no-unused-vars-experimental': [ERROR],
}

Seems like documentation for no-unused-vars could maybe be a bit more clear on if and how it is expected to be combined with naming-convention, I can help out with PR as well

My understanding is this:
The no-unused-vars-experimental version was kind of a technology experiment which rebuilt the rule on a different technical base.
This no-unused-vars is another way to do it.
As the policy is to never delete a rule we now have both usable.

This is explained in #1856