{
  "$schema": "http://json-schema.org/draft-07/schema",
  "definitions": {
    "timestamp": {
      "type": "string"
    },
    "im_history_changed": {
      "type": "object",
      "description": "learn more: https://api.slack.com/events/im_history_changed",
      "properties": {
        "event_ts": {
          "$ref": "#/definitions/timestamp"
        },
        "latest": {
          "$ref": "#/definitions/timestamp"
        },
        "ts": {
          "$ref": "#/definitions/timestamp"
        },
        "type": {
          "const": "im_history_changed"
        }
      },
      "example": {
        "event_ts": "1361482916.000004",
        "latest": "1358877455.000010",
        "ts": "1361482916.000003",
        "type": "im_history_changed"
      }
    }
  }
}