How to use the ramda-adjunct.isNotNull function in ramda-adjunct

function MonetEitherT(monad, isRightValue = true) {
  if (isUndefined(new.target)) {
    if (isNotNull(FlutureTMonetEither) && isFuture(monad)) {
      return FlutureTMonetEither.fromFuture(monad);
    } else if (monad instanceof Identity.fn.init) {
      return Either.of(monad.get());
    } else if (monad instanceof Either.fn.init && isNotNull(FlutureTMonetEither)) {
      return FlutureTMonetEither.fromEither(monad);
    }
    return new MonetEitherT(monad);
  }

  this.run = monad;
  this.isRightValue = isRightValue;
}

function MonetEitherT(monad, isRightValue = true) {
  if (isUndefined(new.target)) {
    if (isNotNull(FlutureTMonetEither) && isFuture(monad)) {
      return FlutureTMonetEither.fromFuture(monad);
    } else if (monad instanceof Identity.fn.init) {
      return Either.of(monad.get());
    } else if (monad instanceof Either.fn.init && isNotNull(FlutureTMonetEither)) {
      return FlutureTMonetEither.fromEither(monad);
    }
    return new MonetEitherT(monad);
  }

  this.run = monad;
  this.isRightValue = isRightValue;
}