Repro

Suppose I want to define an option block that applies to several selectors, which do not match up with one of the predefined "group selectors". Currently the option block needs to be duplicated, like this:

'@typescript-eslint/naming-convention': [
    'error',
  {
    selector: 'class',
    format: ['PascalCase'],
    leadingUnderscore: 'allow'
  },
  {
    selector: 'typeAlias',
    format: ['PascalCase'],
    leadingUnderscore: 'allow'
  },
  {
    selector: 'enum',
    format: ['PascalCase'],
    leadingUnderscore: 'allow'
  },
  {
    selector: 'typeParameter',
    format: ['PascalCase'],
    leadingUnderscore: 'allow'
  },
  . . .
]

Expected Result

It should be possible to avoid duplication by specifying an array of selectors, like this:

'@typescript-eslint/naming-convention': [
    'error',
   {
    // Group selector for: class, interface, typeAlias, enum, typeParameter
    selectors: ['class', 'typeAlias', 'enum', 'typeParameter'],
    format: ['PascalCase'],
    leadingUnderscore: 'allow'
  },
  . . .
]

Additional Info

This arose in a real world situation with this option block and a number of other cases in that same file.

I solved it by creating a macro expandNamingConventionSelectors() that expands the selectors array into multiple blocks with different selector fields.

This worked, however it is clumsy. Also, one of our repos creates a test snapshot with the expanded eslintrc object, and the macro output is difficult to read after it is expanded.

It would be better if naming-convention had built-in support for array of selectors, without need for a macro to generate the blocks. I can't think of any design problems with allowing that.

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