cannot override based on formats

[rittneje]

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Describe the bug

The docs say you can apply overrides to particular formats. https://docs.stoplight.io/docs/spectral/293426e270fac-overrides

However, there does not seem to be a way to do this properly.

If I create a config like so:

extends:
- "spectral:oas"
- "spectral:asyncapi"
overrides:
- formats: ["oas3_0"]
  rules:
    operation-description: "info"

I get an error

�[31mError running Spectral!�[39m
�[31m�[39mError #1: �[31mmust have required property 'files'�[39m
�[31m          at                     …./../../snapshot/project/packages/core/src/ruleset/validation/errors.ts:85      return new RulesetValidationError(inferErrorCode(path, error.keyword), error.message ?? 'unknown error', path)…�[39m
�[31m          at flatMa…                                                                                                                                                                                                             �[39m
�[31m          at convertAjvError…    …./../../snapshot/project/packages/core/src/ruleset/validation/errors.ts:79      return filteredErrors.flatMap(error => …                                                                       �[39m
�[31m          at assertValidRulese…  …./../../snapshot/project/packages/core/src/ruleset/validation/assertions.ts:26  throw new AggregateError(convertAjvErrors(validate.errors ?? []))…                                             �[39m
�[31m          at new Rulese…         …./../../snapshot/project/packages/core/src/ruleset/ruleset.ts:64                assertValidRuleset({ extends: [], ...def })…                                                                   �[39m

As per the error, files is required, even though I don't intend to filter by file name.

If I try to add something for files, it seems to do a union rather than an intersection.

extends:
- "spectral:oas"
- "spectral:asyncapi"
overrides:
- files: ["*"]
  formats: ["oas3_0"]
  rules:
    operation-description: "info"

That is, it applies the override to every file, regardless of format.

To Reproduce

See above.

Expected behavior

There should be a way to override rules for particular formats. Specifying both files and formats should use intersection logic not union logic. (If union logic is desired you should just make two entries.)

Environment (remove any that are not applicable):

• Library version: 6.6.0

[P0lip]

We currently don't allow overrides based on formats alone.
The documentation is possibly a tad misleading here.
As things stand, you always need to specify files.