e">null</span> <span class="tsd-signature-symbol">|</span>
                      <span class="tsd-signature-type">number</span>
                    </h4>
                    <aside class="tsd-sources">
                      <p>
                        Inherited from <a href="IndicatorSeries.html">IndicatorSeries</a>.<a
                          href="IndicatorSeries.html#add"
                          >add</a
                        >
                      </p>
                      <ul>
                   