I use hark to detect when user stops speaking, I simply want to return variable res from inside user stream to parent function stop; however I get undefined within navigator scope. TIA

    function stop() {
            window.AudioContext = window.AudioContext || window.webkitAudioContext;
            const context = new AudioContext();
            var speaking ;
            var options = {};
            var stopping_time;
                navigator.mediaDevices.getUserMedia({audio: true}).then((stream) => {
                    const microphone = context.createMediaStreamSource(stream);
                    var speechEvents = hark(stream, options);
                    speechEvents.on('speaking', function () {
                        console.log("speak");
                        stopping_time = Date.now();
                        speaking = true;
                    });
                    speechEvents.on('stopped_speaking', function () {
                        console.log("stop");
                        speaking = false;
                        stopping_time = Date.now();
                        setTimeout(pause, 2000);
                    });

                    function pause() {
                        if (Math.abs(Date.now() - stopping_time) >= 1500 && speaking === false) {
                            console.log("Assume finished answering since 2 seconds have passed");
                            microphone.mediaStream.getTracks().forEach(function (track) {
                                track.stop();
                            });
                            res = true;
                        }
                    }
                }); return res;
        }