Recently some big PRs with churn was mostly rejected or gave sporadic -1, so these are some preliminarily proposals to check the opinions before investing time.

1. Rule: http://eslint.org/docs/rules/no-unused-vars

   Proposal:

   no-unused-vars: ['error', {args: 'after-used'}]
   

   Hits:

   *.md:          190 (soundly disabled in doc/.eslintrc.yaml)
   
   *.js benchmark: 33
   *.js lib:       45
   *.js test:     300
   *.js tools:      1 (will be fixed in #14251)
   

   Refs: tools: delete an unused argument #14251

2. Rule: http://eslint.org/docs/rules/prefer-arrow-callback

   Proposal:

   `prefer-arrow-callback: ['error', {allowNamedFunctions: false, allowUnboundThis: true}]`
   

   Hits:

   *.md:            15
   
   *.js benchmark: 108
   *.js lib:       114
   *.js test:     4002 (wow...)
   *.js tools:      51
   

3. Rule: http://eslint.org/docs/rules/prefer-destructuring

   Proposal:

   prefer-destructuring: ['error',
                          {array: true, object: true},
                          {enforceForRenamedProperties: false}]
   

   Hits:

   array: *.md:           3
   
   array: *.js benchmark: 7
   array: *.js lib:      59
   array: *.js test:    124
   array: *.js tools:     9
   
   
   object: *.md:             1
   
   object: *.js benchmark: 141
   object: *.js lib:       268
   object: *.js test:      562
   object: *.js tools:      22
   

If there is some consensus for any proposal, it can be used as a starting point for code-and-learn or similar events.

If some or all approved proposals are not appropriate for code-and-learn, I can do any or all if there are volunteers to review.