Dialogflow constructor

const Dialogflow({@required String token, String version: "20170712", String timezone: "America/New_York", String sessionId: "12345", String language: "en" })

Implementation

const Dialogflow(
    {@required this.token,
    this.version = "20170712",
    this.timezone = "America/New_York",
    this.sessionId = "12345",
    this.language = "en"});