Merge pull request #47 from laurynas-karvelis/feature/prevent-event-listener-overflow

feature: add event listeners to get answers from Base.send method only when explicitly asked

src/types/Base.js

@@ -25,9 +25,10 @@ export default class Base extends EventEmitter {
    *				                 gets the Update object containing message
    *
    * @param  {object} bot
+   * @param {boolean} expectAnswer whether a sent message expects an answer from a contact(s)
    * @return {Promise} returns a promise, resolved with message:answer
    */
-  send(bot) {
+  send(bot, expectAnswer = true) {
     if (this._keyboard) {
       const replyMarkup = JSON.stringify(this._keyboard.getProperties());
       this.properties.reply_markup = replyMarkup;
@@ -40,6 +41,12 @@ export default class Base extends EventEmitter {
           return response.result.message_id;
         })
         .then(messageId => {
+          if (!expectAnswer) {
+            // no need to add more event callbacks for the messages that don't need expect an answer
+            resolve();
+            return;
+          }
+
           const chat = this.properties.chat_id;
           let answers = 0;