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export default function(onenter, onupdate, onexit) {
var enter = this.enter(), update = this, exit = this.exit();
if (typeof onenter === "function") {
enter = onenter(enter);
if (enter) enter = enter.selection();
} else {
enter = enter.append(onenter + "");
}
if (onupdate != null) {
update = onupdate(update);
if (update) update = update.selection();
}
if (onexit == null) exit.remove(); else onexit(exit);
return enter && update ? enter.merge(update).order() : update;
}