proc calculateReceiveTimeMs(msgLen: int64; dataRate: int64 = InitialRate): int64 {.
    ...raises: [], tags: [], forbids: [].}

proc init(T: type[BandwidthTracking]; alpha: float = DefaultAlpha): T:type

proc init(T: type[ExponentialMovingAverage]; alpha: float = DefaultAlpha): T:type

proc update(e: var ExponentialMovingAverage; startAt: Moment; bytes: int) {.
    ...raises: [], tags: [], forbids: [].}

proc value(e: var ExponentialMovingAverage): float {....raises: [], tags: [],
    forbids: [].}