Uncaught ReferenceError: RSVP is not defined , error while using require.js with rsvp

I am working on a demo showing the error handling in promises using rsvp.js. Everything seemed fine, till I used the CDN url for rsvp.js in a tag. Now since I have require.js for module loading in my application, I tried loading the rsvp.js module via require js syntax. In the Chrome network tab, I see the rsvp.js module getting loaded properly as well, but I get the below error in console,

Uncaught ReferenceError: RSVP is not defined.

require(["bootstrap","js/rsvp"], function(bootstrap,rsvp) { 
$(document).ready(function () {
    function getEmployeeDetails() {
        var radioValue1 = $("input[name='option1']:checked").val();
        var requrl;
        if (radioValue1 == "fail") {
            requrl = "../../../testservice/getEmployeeIdss";
        } else {
            requrl = "../../../testservice/getEmployeeId";
        }
        return new RSVP.Promise(function (resolve, reject) {
            $.ajax({
                url: requrl,
                success: function (response) {
                    try {
                        $('#successBoard').append("<b> <i> Ajax Call 1 Succeeded! </i>  </b><br/>" + "Employee ID:" + response.stuId + "<br/>");
                        resolve(response.stuId);
                    } catch (e) {
                        reject(e);
                    }
                },
                error: function (xhr, ajaxOptions, thrownError) {
                    console.log('Ajax 1 failed : Rejecting Promise 1');
                    $('#errorBoard').append("<b> <i> Ajax 1 failed : Rejecting Promise 1</i>  </b><br/>");
                    reject(thrownError);
                }
            });

        });
    }