{
  "walker": "jsonschema-draft7",
  "rules": [
    {
      "vocabulary": "core",
      "condition": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "$id": "https://github.com/sourcemeta/alterschema/rules/jsonschema-draft7-to-2019-09/upgrade-official-metaschema",
        "type": "object",
        "required": [ "$schema" ],
        "properties": {
          "$schema": {
            "const": "http://json-schema.org/draft-07/schema#"
          }
        }
      },
      "transform": {
        "$merge": [
          { "$eval": "schema" },
          { "$$schema": "https://json-schema.org/draft/2019-09/schema" }
        ]
      }
    },
    {
      "vocabulary": "core",
      "condition": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "$id": "https://github.com/sourcemeta/alterschema/rules/jsonschema-draft7-to-2019-09/id-anchor",
        "type": "object",
        "required": [ "$id" ],
        "properties": {
          "$id": {
            "type": "string",
            "pattern": "^#"
          }
        }
      },
      "transform": {
        "$merge": [
          { "$eval": "omit(schema, '$id')" },
          {
            "$$anchor": {
              "$eval": "schema['$id'][1:]"
            }
          }
        ]
      }
    },
    {
      "vocabulary": "core",
      "condition": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "$id": "https://github.com/sourcemeta/alterschema/rules/jsonschema-draft7-to-2019-09/definitions",
        "type": "object",
        "required": [ "definitions" ],
        "properties": {
          "definitions": {
            "type": "object"
          }
        }
      },
      "transform": {
        "$merge": [
          { "$eval": "omit(schema, 'definitions')" },
          {
            "$$defs": {
              "$eval": "schema.definitions"
            }
          }
        ]
      }
    },
    {
      "vocabulary": "core",
      "condition": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "$id": "https://github.com/sourcemeta/alterschema/rules/jsonschema-draft7-to-2019-09/definitions-in-ref",
        "type": "object",
        "required": [ "$ref" ],
        "properties": {
          "$ref": {
            "type": "string",
            "pattern": "/definitions/"
          }
        }
      },
      "transform": {
        "$merge": [
          { "$eval": "omit(schema, '$ref')" },
          {
            "$$ref": {
              "$eval": "replace(schema['$ref'], '/definitions/', '/$defs/')"
            }
          }
        ]
      }
    },
    {
      "vocabulary": "core",
      "condition": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "$id": "https://github.com/sourcemeta/alterschema/rules/jsonschema-draft7-to-2019-09/empty-object",
        "const": {}
      },
      "transform": {
        "$eval": "true"
      }
    },
    {
      "vocabulary": "core",
      "condition": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "$id": "https://github.com/sourcemeta/alterschema/rules/jsonschema-draft7-to-2019-09/negated-empty-object",
        "const": { "not": true }
      },
      "transform": {
        "$eval": "false"
      }
    },
    {
      "vocabulary": "validation",
      "condition": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "$id": "https://github.com/sourcemeta/alterschema/rules/jsonschema-draft7-to-2019-09/enum-to-const",
        "type": "object",
        "required": [ "enum" ],
        "properties": {
          "enum": {
            "type": "array",
            "minItems": 1,
            "maxItems": 1
          }
        }
      },
      "transform": {
        "$merge": [
          { "$eval": "omit(schema, 'enum')" },
          {
            "const": {
              "$eval": "schema.enum[0]"
            }
          }
        ]
      }
    },
    {
      "vocabulary": "validation",
      "condition": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "$id": "https://github.com/sourcemeta/alterschema/rules/jsonschema-draft7-to-2019-09/dependencies",
        "type": "object",
        "required": [ "dependencies" ],
        "properties": {
          "dependencies": {
            "type": "object"
          }
        }
      },
      "transform": {
        "$merge": [
          { "$eval": "omit(schema, 'dependencies')" },
          {
            "dependentRequired": {
              "$map": {
                "$eval": "schema.dependencies"
              },
              "each(v,k)": {
                "${k}": {
                  "$if": "typeof(v) == 'array'",
                  "then": {
                    "$eval": "v"
                  }
                }
              }
            }
          },
          {
            "dependentSchemas": {
              "$map": {
                "$eval": "schema.dependencies"
              },
              "each(v,k)": {
                "${k}": {
                  "$if": "typeof(v) == 'object' || typeof(v) == 'boolean'",
                  "then": {
                    "$eval": "v"
                  }
                }
              }
            }
          }
        ]
      }
    }
  ]
}