What is similar to NS Notification Center (Swift) in Flutter?

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I've used "NotificationCenter.default.post(name: Notification.Name("BiddingDone"), object: nil)" to post and "NotificationCenter.default.addObserver(self, selector: #selector(fromBiddingVc), name: Notification.Name("BiddingDone"), object: nil)" to receive and do an action when the post object is received. PLEASE HELP ME WITH THE SIMILAR THING IN FLUTTER.

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