{
  "walker": "jsonschema-draft6",
  "rules": [
    {
      "vocabulary": "core",
      "condition": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "$id": "https://github.com/sourcemeta/alterschema/rules/jsonschema-draft6-to-draft7/upgrade-official-metaschema",
        "type": "object",
        "required": [ "$schema" ],
        "properties": {
          "$schema": {
            "const": "http://json-schema.org/draft-06/schema#"
          }
        }
      },
      "transform": {
        "$merge": [
          { "$eval": "schema" },
          { "$$schema": "http://json-schema.org/draft-07/schema#" }
        ]
      }
    },
    {
      "vocabulary": "core",
      "condition": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "$id": "https://github.com/sourcemeta/alterschema/rules/jsonschema-draft6-to-draft7/empty-object",
        "const": {}
      },
      "transform": {
        "$eval": "true"
      }
    },
    {
      "vocabulary": "core",
      "condition": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "$id": "https://github.com/sourcemeta/alterschema/rules/jsonschema-draft6-to-draft7/negated-empty-object",
        "const": { "not": true }
      },
      "transform": {
        "$eval": "false"
      }
    },
    {
      "vocabulary": "validation",
      "condition": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "$id": "https://github.com/sourcemeta/alterschema/rules/jsonschema-draft6-to-draft7/enum-to-const",
        "type": "object",
        "required": [ "enum" ],
        "properties": {
          "enum": {
            "type": "array",
            "minItems": 1,
            "maxItems": 1
          }
        }
      },
      "transform": {
        "$merge": [
          { "$eval": "omit(schema, 'enum')" },
          {
            "const": {
              "$eval": "schema.enum[0]"
            }
          }
        ]
      }
    }
  ]
}