-- unsupported.json --
{
  "$schema": "http://json-schema.org/draft-07/schema",
  "definitions": {
    "ref": {
      "properties": {
        "branches": {
          "type": "object"
        },
        "branches-ignore": {
          "type": "object"
        }
      },
      "oneOf": [
        {
          "type": "object",
          "allOf": [
            {
              "not": {
                "required": [
                  "branches",
                  "branches-ignore"
                ]
              }
            }
          ]
        },
        {
          "type": "null"
        }
      ]
    }
  }
}


-- out.cue --
@jsonschema(schema="http://json-schema.org/draft-07/schema")
_

#ref: null | {
	branches?: {
		...
	}
	"branches-ignore"?: {
		...
	}
	...
}