RED</span>
          <div class="features">@<a href="../../dart-core/Deprecated-class.html">Deprecated</a>(&quot;Use upgradeRequired instead&quot;)</div>
        </section>
                <section class="summary source-code" id="source">
          <h2><span>Implementation</span></h2>
          <pre class="language-dart"><code class="language-dart">static const int UPGRADE_REQUIRED = upgradeRequired

</code></pre>
        </section>

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