I think you have to write

public final native CssHolder  perform(Element element, int duration, 
String args) /*-{
  return $wnd.CssMod.perform(element, eval('obj = ' + args + ';'));
}-*/;

perform(element, "{ \"opacity\":2}");




Maybe the following also works: 

public final native CssHolder  perform(Element element, int duration, 
JavaScriptObject params) /*-{
  return $wnd.CssMod.perform(element, params);
}-*/;

perform(element, JsonUtils.safeEval("{ \"opacity\":2}"));

With the above you could probably also create a Params.Builder that creates 
the JSO and then use that JSO directly as parameter.


-- J.

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