Remove unnecessary invariant check

Author: realityforge

src/main/java/react4j/widget/ReactWidget.java

@@ -6,11 +6,8 @@
 import java.util.Objects;
 import javax.annotation.Nonnull;
 import jsinterop.base.Js;
-import org.realityforge.braincheck.BrainCheckConfig;
-import react4j.React;
 import react4j.ReactNode;
 import react4j.dom.ReactDOM;
-import static org.realityforge.braincheck.Guards.*;
 
 /**
  * A GWT widget that renders a React4j element.
@@ -36,11 +33,6 @@ public ReactWidget( @Nonnull final ReactNode node )
   {
     _element = Document.get().createDivElement();
     _node = Objects.requireNonNull( node );
-    if ( BrainCheckConfig.checkApiInvariants() )
-    {
-      apiInvariant( () -> React.isValidElement( node ),
-                    () -> "A ReactNode that is not a valid element has been incorrectly passed to ReactWidget constructor" );
-    }
     setElement( _element );
   }