Check.js

    //THis function checks for mails sent by medium.
    //We attatch a query parameter to the request body.
    checkForMediumMails(){
        var query = "from:noreply@medium.com is:unread";
        this.gmail.users.messages.list({
            userId: this.me,
            q: query 
        }, (err, res) => {
            if(!err){

                //mail array stores the mails.
                var mails = res.data.messages;

                //We call the getMail function passing the id of first mail as parameter.
                this.getMail(mails[0].id);
            }
            else{
                console.log(err);
            }
        });        
    }