no-unused-keys: allow ignore-per-file

[alxndrsn]

What rule do you want to change?

no-unused-keys

Does this change cause the rule to produce more or fewer warnings?

More warnings.

How will the change be implemented? (New option, new default behavior, etc.)?

Option ignores: option to supply object instead of array, restricting lists of rules to groups of files.

Please provide some example code that this change will affect:

ignores: {
  '**/SomeComponent.vue': [
    '/^dynamic\\.key\\.particular_to_this_file\\./',
  ],
  '**/*': [
    'very.special.key',
  ],
},

What does the rule currently do for this code?

Currently ignores rules have to be global, e.g.

ignores: [
  '/^dynamic\\.key\\.particular_to_this_file\\./',
  'very.special.key',
],

What will the rule do after it's changed?

Allow more fine-grained ignore rules.

[alxndrsn]

It looks like this can be achieved directly in eslint config with overrides (classic) or multiple config exports in flat config, or per-file comment-based config.

However, that doesn't seem ideal as IIUC other config would need to be repeated to maintain consistent settings across files.