How to send a meeting request correctly with nodemailer?

Question

I am trying to use the following code to send out meeting request using nodemailer. The problem I am facing is that the meeting invite is going as an attachment ics file instead of request where one can directly add. I have tried it on multiple mail client. Any pointers would be highly appreciated.

transport.sendMail({
                    from: 'BakBak.io <[email protected]>',
                    to: '[email protected]',
                    subject: 'Meeting',
                    //html: "Hi",
                    text: "Hola!!",
                    alternative: {
                      contentType: "text/calendar; method=REQUEST; name='meeting.ics';component=VEVENT",
                      contents: new Buffer(cal.toString()),
                      contentEncoding:"7bit",
                      "Content-Class":"urn:content-classes:calendarmessage"
                    },
                    headers: {
                              "Content-Type": "text/calendar", 
                              //"charset":"utf-8",
                              "method":"REQUEST",
                              "component":"VEVENT",
                              "Content-Class":"urn:content-classes:calendarmessage"
                            }//,
                    //attachments : [{filename:'invite.ics',contents: cal.toString()}]
                    }, function(err, responseStatus) {
                    if (err) {
                        console.log(err);
                        res.render('schedule',{errors: err.message});
                    } else {
                        console.log(responseStatus.message);
                        res.render('schedule',{success_msg: "Successfully Created!"});
                    }
                });

Answer 1

Gmail does not show meeting request and give an option to add to calendar if sender and receiver are same.

This is what worked for me:

transport.sendMail({
                    from: 'BakBak.io <[email protected]>',
                    to: '[email protected]',
                    subject: 'Meeting',
                    html: "Hiya!!",
                    text: "Hola!!",
                    alternatives: [{
                      contentType: "text/calendar",
                      content: new Buffer(ical)
                    }]
                    }, function(err, responseStatus) {
                    if (err) {
                        console.log(err);
                        res.render('schedule',{errors: err.message});
                    } else {
                        console.log(responseStatus.message);
                        res.render('schedule',{success_msg: "Successfully Created!"});
                    }
                });