Runtime.RemoteObject

{
  "id": "RemoteObject",
  "type": "object",
  "description": "Mirror object referencing original JavaScript object.",
  "properties": [
    {
      "name": "type",
      "type": "string",
      "enum": [
        "object",
        "function",
        "undefined",
        "string",
        "number",
        "boolean",
        "symbol"
      ],
      "description": "Object type."
    },
    {
      "name": "subtype",
      "type": "string",
      "optional": true,
      "enum": [
        "null",
        "error",
        "promise",
        "node"
      ],
      "description": "Object subtype hint. Specified for object type values only."
    },
    {
      "name": "className",
      "type": "string",
      "optional": true,
      "description": "Object class (constructor) name. Specified for object type values only."
    },
    {
      "name": "value",
      "type": "any",
      "optional": true,
      "description": "Remote object value in case of primitive values or JSON values (if it was requested)."
    },
    {
      "name": "unserializableValue",
      "$ref": "UnserializableValue",
      "optional": true,
      "description": "Primitive value which can not be JSON-stringified does not have value, but gets this property."
    },
    {
      "name": "description",
      "type": "string",
      "optional": true,
      "description": "String representation of the object."
    },
    {
      "name": "objectId",
      "$ref": "RemoteObjectId",
      "optional": true,
      "description": "Unique object identifier (for non-primitive values)."
    },
    {
      "name": "msDebuggerPropertyId",
      "type": "string",
      "optional": true,
      "experimental": true,
      "description": "Microsoft: The associated debugger property id for this object."
    }
  ]
}