Method chaining in classes in javascript

chained.js

class BotResponseFormatter {
  formattedResponse;
  constructor(botInterpretation) {
    this.formattedResponse = botInterpretation;
  }

  /**
   *
   * @param {string} replyType possible options are 'text', 'option'
   */
  addReplyType(replyType) {
    this.formattedResponse.reply_type = replyType;
    return this;
  }

  /**
   *
   * @param {string} reply
   */
  addReply(reply) {
    this.formattedResponse.reply = reply;
    return this;
  }

  /**
   *
   * @param {Object[]} options
   */
  addOptions(options) {
    this.formattedResponse.options = options;
    return this;
  }

  /**
   * returns final response
   */
  getResponse() {
    return this.formattedResponse;
  }
}


const a = new BotResponseFormatter({a: "hello"}).addReplyType("text").getResponse();
console.log(a); // {a: "hello", reply_type: "text"}