}
// setup fields
JsVars vars = new JsVars(x.getSourceInfo());
for (int i = 0; i < jsFields.size(); ++i) {
JsNode node = jsFields.get(i);
if (node instanceof JsVar) {
vars.add((JsVar) node);
} else {
assert (node instanceof JsStatement);
JsStatement stmt = (JsStatement) node;