piece of code of node dota2 spectator example.js

var finished = true;
var onFriendsMessage = function onFriendsMessage(source, message, type, chatter){
	// respond to both chat room and private messages
    if (type == 1) //1, message; 2, tying
        if(friends.personaStates[source] != undefined){
            console.log('Received message: \'' +message+'\' from '+friends.personaStates[source].player_name);
           
            if(finished){
            	 var rl = require('readline').createInterface({
                	input: process.stdin,
                	ouput: process.stdout
            	});
                finished = false;
                rl.question("What do you want to say to "+friends.personaStates[source].player_name ,function(answer){
                    //console.log(answer);
                    friends.sendMessage(source, answer, steam.EChatEntryType.ChatMsg);
                    finished = true;
                    rl.close();
                });
            }
        }
    else
        console.log('Received message: ' +message);
        //console.log(util.inspect(steam.EChatEntryType, false, null));
	if (message == 'ping') {
		friends.sendMessage(source, 'pong', steam.EChatEntryType.ChatMsg); // ChatMsg by default
	}

}

Sometimes, a conversion is triggered only after an initiation.