Method transaction

packages/firebase-database/index.android.ts:507–535

(transactionUpdate: (currentData: object) => object, onComplete?: (error: FirebaseError, committed: boolean, finalResult: any) => void, applyLocally: boolean = true)

		});
	}
	transaction(transactionUpdate: (currentData: object) => object, onComplete?: (error: FirebaseError, committed: boolean, finalResult: any) => void, applyLocally: boolean = true): Promise<TransactionResult> {
		return new Promise((resolve, reject) => {
			NSDatabaseReference().transaction(
				this.native,
				applyLocally,
				new org.nativescript.firebase.database.FirebaseDatabase.TransactionCallback({
					doTransaction(data: any): any {
						const newData = transactionUpdate(deserialize(data));
						// TODO improve
						return serializeItems(newData, true);
					},
					onComplete(error: com.google.firebase.database.DatabaseError, commited: boolean, snapshot: com.google.firebase.database.DataSnapshot): void {
						const ss = DataSnapshot.fromNative(snapshot);
						if (error) {
							const err = FirebaseError.fromNative(error);
							onComplete?.(err, commited, ss);
							reject(err);
						} else {
							onComplete?.(null, commited, ss);
							resolve({
								commited,
								snapshot: ss,
							});
						}
					},
				})
			);
		});
	}
	update(values: { [key: string]: any }, onComplete?: (error: FirebaseError) => void): Promise<void> {
		return new Promise((resolve, reject) => {
			NSDatabaseReference().update(