Interoperability with GWT Widget API

<!-- https://jarcasting.com/artifacts/org.realityforge.react4j/react4j-widget/ -->
<dependency>
    <groupId>org.realityforge.react4j</groupId>
    <artifactId>react4j-widget</artifactId>
    <version>0.54</version>
</dependency>

// https://jarcasting.com/artifacts/org.realityforge.react4j/react4j-widget/
implementation 'org.realityforge.react4j:react4j-widget:0.54'

// https://jarcasting.com/artifacts/org.realityforge.react4j/react4j-widget/
implementation ("org.realityforge.react4j:react4j-widget:0.54")

'org.realityforge.react4j:react4j-widget:jar:0.54'

<dependency org="org.realityforge.react4j" name="react4j-widget" rev="0.54">
  <artifact name="react4j-widget" type="jar" />
</dependency>

@Grapes(
@Grab(group='org.realityforge.react4j', module='react4j-widget', version='0.54')
)

libraryDependencies += "org.realityforge.react4j" % "react4j-widget" % "0.54"

[org.realityforge.react4j/react4j-widget "0.54"]