RepeatDelay is not working

[SrikarAlishetty1204]

I am trying to delay repeat loop in animations using repeatDelay but this isn't working
var tween = new TWEEN.Tween(o, timeline).to({ value: duration }, duration)
.onStart(function () {
mediaElements.forEach(async (x) => {
x.play();
}
}
.onComplete(function () {
mediaElements.forEach(async (x) => {
x.pause();
}
}
.onRepeat(function () {
elements.forEach(x => {
x.currentTime = 0;
x.play();
});
})
.repeat(loopCount == loopTypes.forever ? foreverLoop : loopCount - 1)
.repeatDelay(2000)

repeatDelay isn't working here