tween</span> property 
    <a href="https://dart.dev/null-safety" class="feature feature-null-safety" title="Supports the null safety language feature.">Null safety</a>
</h1></div>

        <section class="multi-line-signature">
          <a href="https://api.flutter.dev/flutter/animation/Tween-class.html">Tween</a><span class="signature">&lt;<wbr><span class="type-parameter">T</span>&gt;</span>?
          <span class="name ">tween</span>
          <div class="features">final</div>

        </section>
     