Merge branch 'flutter-upgrade' of https://github.com/cake-tech/cake_wallet into CW-182-allow-trusted-nodes

 Conflicts:

	cw_core/lib/node.dart

	lib/view_model/node_list/node_create_or_edit_view_model.dart

analysis_options.yaml

@@ -1,51 +1,73 @@
+include: package:lints/recommended.yaml
+
 analyzer:
-  strong-mode:
+  exclude: [
-    implicit-casts: false
+    build/**,
-    implicit-dynamic: false
+    lib/**.g.dart,
-  exclude: [build/**, lib/generated/*.dart, lib/**.g.dart, cw_monero/ios/External/**, cw_shared_external/**, shared_external/**]
+    cw_core/lib/**.g.dart,
+    cw_haven/lib/**.g.dart,
+    cw_monero/lib/**.g.dart,
+    lib/generated/*.dart,
+    cw_monero/ios/External/**,
+    cw_shared_external/**,
+    shared_external/**]
+  language:
+    strict-casts: true
+    strict-raw-types: true
 
 linter:
   rules:
-    - always_declare_return_types
-    - annotate_overrides
-    - avoid_empty_else
-    - avoid_init_to_null
-    - avoid_return_types_on_setters
-    - await_only_futures
-    - camel_case_types
     - cancel_subscriptions
-    - close_sinks
+
-    - comment_references
+
-    - constant_identifier_names
+# analyzer:
-    - control_flow_in_finally
+#   strong-mode:
-    - empty_catches
+#     implicit-casts: false
-    - empty_constructor_bodies
+#     implicit-dynamic: false
-    - empty_statements
+#   exclude: [build/**, lib/generated/*.dart, lib/**.g.dart, cw_monero/ios/External/**, cw_shared_external/**, shared_external/**]
-    - hash_and_equals
+
-    - invariant_booleans
+# linter:
-    - iterable_contains_unrelated_type
+#   rules:
-    - library_names
+#     - always_declare_return_types
-    - library_prefixes
+#     - annotate_overrides
-    - list_remove_unrelated_type
+#     - avoid_empty_else
-    - literal_only_boolean_expressions
+#     - avoid_init_to_null
-    - non_constant_identifier_names
+#     - avoid_return_types_on_setters
-    - one_member_abstracts
+#     - await_only_futures
-    - only_throw_errors
+#     - camel_case_types
-    - overridden_fields
+#     - cancel_subscriptions
-    - package_api_docs
+#     - close_sinks
-    - package_names
+#     - comment_references
-    - package_prefixed_library_names
+#     - constant_identifier_names
-    - parameter_assignments
+#     - control_flow_in_finally
-    - prefer_final_fields
+#     - empty_catches
-    - prefer_final_locals
+#     - empty_constructor_bodies
-    - prefer_is_not_empty
+#     - empty_statements
-    - slash_for_doc_comments
+#     - hash_and_equals
-    - sort_constructors_first
+#     - invariant_booleans
-    - sort_unnamed_constructors_first
+#     - iterable_contains_unrelated_type
-    - test_types_in_equals
+#     - library_names
-    - throw_in_finally
+#     - library_prefixes
-    - type_init_formals
+#     - list_remove_unrelated_type
-    - unawaited_futures
+#     - literal_only_boolean_expressions
-    - unnecessary_getters_setters
+#     - non_constant_identifier_names
-    - unrelated_type_equality_checks
+#     - one_member_abstracts
-    - valid_regexps
+#     - only_throw_errors
+#     - overridden_fields
+#     - package_api_docs
+#     - package_names
+#     - package_prefixed_library_names
+#     - parameter_assignments
+#     - prefer_final_fields
+#     - prefer_final_locals
+#     - prefer_is_not_empty
+#     - slash_for_doc_comments
+#     - sort_constructors_first
+#     - sort_unnamed_constructors_first
+#     - test_types_in_equals
+#     - throw_in_finally
+#     - type_init_formals
+#     - unawaited_futures
+#     - unnecessary_getters_setters
+#     - unrelated_type_equality_checks
+#     - valid_regexps

android/app/build.gradle

@@ -37,7 +37,7 @@ if (appPropertiesFile.exists()) {
 }
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 33
 
     lintOptions {
         disable 'InvalidPackage'
@@ -80,6 +80,8 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
+
+    ndkVersion "25.1.8937393"
 }
 
 flutter {

android/build.gradle

@@ -1,4 +1,5 @@
 buildscript {
+    ext.kotlin_version = '1.5.10'
     repositories {
         google()
         jcenter()
@@ -7,6 +8,7 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:4.1.3'
         classpath 'com.google.gms:google-services:4.3.8'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
 

cw_bitcoin/lib/address_from_output.dart

@@ -8,7 +8,7 @@ String addressFromOutput(Uint8List script, bitcoin.NetworkType networkType) {
         data: PaymentData(output: script),
         network: networkType)
       .data
-      .address;
+      .address!;
   } catch (_) {}
 
   try {
@@ -16,8 +16,8 @@ String addressFromOutput(Uint8List script, bitcoin.NetworkType networkType) {
         data: PaymentData(output: script),
         network: networkType)
       .data
-      .address;
+      .address!;
   } catch(_) {}
 
-  return null;
+  return '';
 }

cw_bitcoin/lib/bitcoin_address_record.dart

@@ -2,7 +2,7 @@ import 'dart:convert';
 
 class BitcoinAddressRecord {
   BitcoinAddressRecord(this.address,
-    {this.index, this.isHidden = false, bool isUsed = false})
+    {required this.index, this.isHidden = false, bool isUsed = false})
    : _isUsed = isUsed;
 
   factory BitcoinAddressRecord.fromJSON(String jsonSource) {
@@ -11,8 +11,8 @@ class BitcoinAddressRecord {
     return BitcoinAddressRecord(
       decoded['address'] as String,
       index: decoded['index'] as int,
-      isHidden: decoded['isHidden'] as bool ?? false,
+      isHidden: decoded['isHidden'] as bool? ?? false,
-      isUsed: decoded['isUsed'] as bool ?? false);
+      isUsed: decoded['isUsed'] as bool? ?? false);
   }
 
   @override

cw_bitcoin/lib/bitcoin_amount_format.dart

@@ -7,10 +7,10 @@ final bitcoinAmountFormat = NumberFormat()
   ..maximumFractionDigits = bitcoinAmountLength
   ..minimumFractionDigits = 1;
 
-String bitcoinAmountToString({int amount}) => bitcoinAmountFormat.format(
+String bitcoinAmountToString({required int amount}) => bitcoinAmountFormat.format(
     cryptoAmountToDouble(amount: amount, divider: bitcoinAmountDivider));
 
-double bitcoinAmountToDouble({int amount}) =>
+double bitcoinAmountToDouble({required int amount}) =>
     cryptoAmountToDouble(amount: amount, divider: bitcoinAmountDivider);
 
 int stringDoubleToBitcoinAmount(String amount) {

cw_bitcoin/lib/bitcoin_mnemonic.dart

@@ -106,15 +106,18 @@ Future<String> generateMnemonic(
   return result;
 }
 
-Uint8List mnemonicToSeedBytes(String mnemonic, {String prefix = segwit}) {
+Future<Uint8List> mnemonicToSeedBytes(String mnemonic, {String prefix = segwit}) async {
   final pbkdf2 = cryptography.Pbkdf2(
-      macAlgorithm: cryptography.Hmac(cryptography.sha512),
+      macAlgorithm: cryptography.Hmac.sha512(),
       iterations: 2048,
       bits: 512);
   final text = normalizeText(mnemonic);
-
+  // pbkdf2.deriveKey(secretKey: secretKey, nonce: nonce)
-  return pbkdf2.deriveBitsSync(text.codeUnits,
+  final key = await pbkdf2.deriveKey(
-      nonce: cryptography.Nonce('electrum'.codeUnits));
+      secretKey: cryptography.SecretKey(text.codeUnits),
+      nonce: 'electrum'.codeUnits);
+  final bytes = await key.extractBytes();
+  return Uint8List.fromList(bytes);
 }
 
 bool matchesAnyPrefix(String mnemonic) =>

cw_bitcoin/lib/bitcoin_transaction_credentials.dart

@@ -2,9 +2,9 @@ import 'package:cw_bitcoin/bitcoin_transaction_priority.dart';
 import 'package:cw_core/output_info.dart';
 
 class BitcoinTransactionCredentials {
-  BitcoinTransactionCredentials(this.outputs, {this.priority, this.feeRate});
+  BitcoinTransactionCredentials(this.outputs, {required this.priority, this.feeRate});
 
   final List<OutputInfo> outputs;
-  final BitcoinTransactionPriority priority;
+  final BitcoinTransactionPriority? priority;
-  final int feeRate;
+  final int? feeRate;
 }

cw_bitcoin/lib/bitcoin_transaction_priority.dart

@@ -2,7 +2,7 @@ import 'package:cw_core/transaction_priority.dart';
 //import 'package:cake_wallet/generated/i18n.dart';
 
 class BitcoinTransactionPriority extends TransactionPriority {
-  const BitcoinTransactionPriority({String title, int raw})
+  const BitcoinTransactionPriority({required String title, required int raw})
       : super(title: title, raw: raw);
 
   static const List<BitcoinTransactionPriority> all = [fast, medium, slow];
@@ -13,7 +13,7 @@ class BitcoinTransactionPriority extends TransactionPriority {
   static const BitcoinTransactionPriority fast =
       BitcoinTransactionPriority(title: 'Fast', raw: 2);
 
-  static BitcoinTransactionPriority deserialize({int raw}) {
+  static BitcoinTransactionPriority deserialize({required int raw}) {
     switch (raw) {
       case 0:
         return slow;
@@ -22,7 +22,7 @@ class BitcoinTransactionPriority extends TransactionPriority {
       case 2:
         return fast;
       default:
-        return null;
+        throw Exception('Unexpected token: $raw for BitcoinTransactionPriority deserialize');
     }
   }
 
@@ -53,7 +53,7 @@ class BitcoinTransactionPriority extends TransactionPriority {
 }
 
 class LitecoinTransactionPriority extends BitcoinTransactionPriority {
-  const LitecoinTransactionPriority({String title, int raw})
+  const LitecoinTransactionPriority({required String title, required int raw})
       : super(title: title, raw: raw);
 
   static const List<LitecoinTransactionPriority> all = [fast, medium, slow];
@@ -64,7 +64,7 @@ class LitecoinTransactionPriority extends BitcoinTransactionPriority {
   static const LitecoinTransactionPriority fast =
       LitecoinTransactionPriority(title: 'Fast', raw: 2);
 
-  static LitecoinTransactionPriority deserialize({int raw}) {
+  static LitecoinTransactionPriority deserialize({required int raw}) {
     switch (raw) {
       case 0:
         return slow;
@@ -73,7 +73,7 @@ class LitecoinTransactionPriority extends BitcoinTransactionPriority {
       case 2:
         return fast;
       default:
-        return null;
+        throw Exception('Unexpected token: $raw for LitecoinTransactionPriority deserialize');
     }
   }
 

cw_bitcoin/lib/bitcoin_wallet.dart

@@ -1,4 +1,5 @@
 import 'package:cw_bitcoin/bitcoin_mnemonic.dart';
+import 'package:cw_core/crypto_currency.dart';
 import 'package:cw_core/unspent_coins_info.dart';
 import 'package:hive/hive.dart';
 import 'package:mobx/mobx.dart';
@@ -17,12 +18,13 @@ class BitcoinWallet = BitcoinWalletBase with _$BitcoinWallet;
 
 abstract class BitcoinWalletBase extends ElectrumWallet with Store {
   BitcoinWalletBase(
-      {@required String mnemonic,
+      {required String mnemonic,
-      @required String password,
+      required String password,
-      @required WalletInfo walletInfo,
+      required WalletInfo walletInfo,
-      @required Box<UnspentCoinsInfo> unspentCoinsInfo,
+      required Box<UnspentCoinsInfo> unspentCoinsInfo,
-      List<BitcoinAddressRecord> initialAddresses,
+      required Uint8List seedBytes,
-      ElectrumBalance initialBalance,
+      List<BitcoinAddressRecord>? initialAddresses,
+      ElectrumBalance? initialBalance,
       int initialRegularAddressIndex = 0,
       int initialChangeAddressIndex = 0})
       : super(
@@ -32,7 +34,9 @@ abstract class BitcoinWalletBase extends ElectrumWallet with Store {
             unspentCoinsInfo: unspentCoinsInfo,
             networkType: bitcoin.bitcoin,
             initialAddresses: initialAddresses,
-            initialBalance: initialBalance) {
+            initialBalance: initialBalance,
+            seedBytes: seedBytes,
+            currency: CryptoCurrency.btc) {
     walletAddresses = BitcoinWalletAddresses(
         walletInfo,
         electrumClient: electrumClient,
@@ -40,20 +44,40 @@ abstract class BitcoinWalletBase extends ElectrumWallet with Store {
         initialRegularAddressIndex: initialRegularAddressIndex,
         initialChangeAddressIndex: initialChangeAddressIndex,
         mainHd: hd,
-        sideHd: bitcoin.HDWallet.fromSeed(
+        sideHd: bitcoin.HDWallet.fromSeed(seedBytes, network: networkType)
-                mnemonicToSeedBytes(mnemonic), network: networkType)
               .derivePath("m/0'/1"),
         networkType: networkType);
   }
 
-  static Future<BitcoinWallet> open({
+  static Future<BitcoinWallet> create({
-    @required String name,
+    required String mnemonic,
-    @required WalletInfo walletInfo,
+    required String password,
-    @required Box<UnspentCoinsInfo> unspentCoinsInfo,
+    required WalletInfo walletInfo,
-    @required String password,
+    required Box<UnspentCoinsInfo> unspentCoinsInfo,
+    List<BitcoinAddressRecord>? initialAddresses,
+    ElectrumBalance? initialBalance,
+    int initialRegularAddressIndex = 0,
+    int initialChangeAddressIndex = 0
   }) async {
-    final snp = ElectrumWallletSnapshot(name, walletInfo.type, password);
+    return BitcoinWallet(
-    await snp.load();
+        mnemonic: mnemonic,
+        password: password,
+        walletInfo: walletInfo,
+        unspentCoinsInfo: unspentCoinsInfo,
+        initialAddresses: initialAddresses,
+        initialBalance: initialBalance,
+        seedBytes: await mnemonicToSeedBytes(mnemonic),
+        initialRegularAddressIndex: initialRegularAddressIndex,
+        initialChangeAddressIndex: initialChangeAddressIndex);
+  }
+
+  static Future<BitcoinWallet> open({
+    required String name,
+    required WalletInfo walletInfo,
+    required Box<UnspentCoinsInfo> unspentCoinsInfo,
+    required String password,
+  }) async {
+    final snp = await ElectrumWallletSnapshot.load(name, walletInfo.type, password);
     return BitcoinWallet(
         mnemonic: snp.mnemonic,
         password: password,
@@ -61,6 +85,7 @@ abstract class BitcoinWalletBase extends ElectrumWallet with Store {
         unspentCoinsInfo: unspentCoinsInfo,
         initialAddresses: snp.addresses,
         initialBalance: snp.balance,
+        seedBytes: await mnemonicToSeedBytes(snp.mnemonic),
         initialRegularAddressIndex: snp.regularAddressIndex,
         initialChangeAddressIndex: snp.changeAddressIndex);
   }

cw_bitcoin/lib/bitcoin_wallet_addresses.dart

@@ -16,13 +16,13 @@ abstract class BitcoinWalletAddressesBase extends ElectrumWalletAddresses
     with Store {
   BitcoinWalletAddressesBase(
       WalletInfo walletInfo,
-      {@required List<BitcoinAddressRecord> initialAddresses,
+      {required bitcoin.HDWallet mainHd,
+        required bitcoin.HDWallet sideHd,
+        required bitcoin.NetworkType networkType,
+        required ElectrumClient electrumClient,
+        List<BitcoinAddressRecord>? initialAddresses,
         int initialRegularAddressIndex = 0,
-        int initialChangeAddressIndex = 0,
+        int initialChangeAddressIndex = 0})
-        ElectrumClient electrumClient,
-        @required bitcoin.HDWallet mainHd,
-        @required bitcoin.HDWallet sideHd,
-        @required bitcoin.NetworkType networkType})
       : super(
         walletInfo,
         initialAddresses: initialAddresses,
@@ -34,6 +34,6 @@ abstract class BitcoinWalletAddressesBase extends ElectrumWalletAddresses
         networkType: networkType);
 
   @override
-  String getAddress({@required int index, @required bitcoin.HDWallet hd}) =>
+  String getAddress({required int index, required bitcoin.HDWallet hd}) =>
       generateP2WPKHAddress(hd: hd, index: index, networkType: networkType);
 }

cw_bitcoin/lib/bitcoin_wallet_creation_credentials.dart

@@ -2,13 +2,13 @@ import 'package:cw_core/wallet_credentials.dart';
 import 'package:cw_core/wallet_info.dart';
 
 class BitcoinNewWalletCredentials extends WalletCredentials {
-  BitcoinNewWalletCredentials({String name, WalletInfo walletInfo})
+  BitcoinNewWalletCredentials({required String name, WalletInfo? walletInfo})
       : super(name: name, walletInfo: walletInfo);
 }
 
 class BitcoinRestoreWalletFromSeedCredentials extends WalletCredentials {
   BitcoinRestoreWalletFromSeedCredentials(
-      {String name, String password, this.mnemonic, WalletInfo walletInfo})
+      {required String name, required String password, required this.mnemonic, WalletInfo? walletInfo})
       : super(name: name, password: password, walletInfo: walletInfo);
 
   final String mnemonic;
@@ -16,7 +16,7 @@ class BitcoinRestoreWalletFromSeedCredentials extends WalletCredentials {
 
 class BitcoinRestoreWalletFromWIFCredentials extends WalletCredentials {
   BitcoinRestoreWalletFromWIFCredentials(
-      {String name, String password, this.wif, WalletInfo walletInfo})
+      {required String name, required String password, required this.wif, WalletInfo? walletInfo})
       : super(name: name, password: password, walletInfo: walletInfo);
 
   final String wif;

cw_bitcoin/lib/bitcoin_wallet_keys.dart

@@ -1,7 +1,5 @@
-import 'package:flutter/foundation.dart';
-
 class BitcoinWalletKeys {
-  const BitcoinWalletKeys({@required this.wif, @required this.privateKey, @required this.publicKey});
+  const BitcoinWalletKeys({required this.wif, required this.privateKey, required this.publicKey});
 
   final String wif;
   final String privateKey;

cw_bitcoin/lib/bitcoin_wallet_service.dart

@@ -10,6 +10,7 @@ import 'package:cw_core/pathForWallet.dart';
 import 'package:cw_core/wallet_info.dart';
 import 'package:cw_core/wallet_type.dart';
 import 'package:hive/hive.dart';
+import 'package:collection/collection.dart';
 
 class BitcoinWalletService extends WalletService<
     BitcoinNewWalletCredentials,
@@ -25,10 +26,10 @@ class BitcoinWalletService extends WalletService<
 
   @override
   Future<BitcoinWallet> create(BitcoinNewWalletCredentials credentials) async {
-    final wallet = BitcoinWallet(
+    final wallet = await BitcoinWalletBase.create(
         mnemonic: await generateMnemonic(),
-        password: credentials.password,
+        password: credentials.password!,
-        walletInfo: credentials.walletInfo,
+        walletInfo: credentials.walletInfo!,
         unspentCoinsInfo: unspentCoinsInfoSource);
     await wallet.save();
     await wallet.init();
@@ -41,9 +42,8 @@ class BitcoinWalletService extends WalletService<
 
   @override
   Future<BitcoinWallet> openWallet(String name, String password) async {
-    final walletInfo = walletInfoSource.values.firstWhere(
+    final walletInfo = walletInfoSource.values.firstWhereOrNull(
-        (info) => info.id == WalletBase.idFor(name, getType()),
+        (info) => info.id == WalletBase.idFor(name, getType()))!;
-        orElse: () => null);
     final wallet = await BitcoinWalletBase.open(
         password: password, name: name, walletInfo: walletInfo,
         unspentCoinsInfo: unspentCoinsInfoSource);
@@ -68,10 +68,10 @@ class BitcoinWalletService extends WalletService<
       throw BitcoinMnemonicIsIncorrectException();
     }
 
-    final wallet = BitcoinWallet(
+    final wallet = await BitcoinWalletBase.create(
-        password: credentials.password,
+        password: credentials.password!,
         mnemonic: credentials.mnemonic,
-        walletInfo: credentials.walletInfo,
+        walletInfo: credentials.walletInfo!,
         unspentCoinsInfo: unspentCoinsInfoSource);
     await wallet.save();
     await wallet.init();

cw_bitcoin/lib/electrum.dart

@@ -7,6 +7,7 @@ import 'package:cw_bitcoin/bitcoin_amount_format.dart';
 import 'package:cw_bitcoin/script_hash.dart';
 import 'package:flutter/foundation.dart';
 import 'package:rxdart/rxdart.dart';
+import 'package:collection/collection.dart';
 
 String jsonrpcparams(List<Object> params) {
   final _params = params?.map((val) => '"${val.toString()}"')?.join(',');
@@ -14,14 +15,20 @@ String jsonrpcparams(List<Object> params) {
 }
 
 String jsonrpc(
-        {String method, List<Object> params, int id, double version = 2.0}) =>
+        {required String method,
+        required List<Object> params,
+        required int id,
+        double version = 2.0}) =>
     '{"jsonrpc": "$version", "method": "$method", "id": "$id",  "params": ${json.encode(params)}}\n';
 
 class SocketTask {
-  SocketTask({this.completer, this.isSubscription, this.subject});
+  SocketTask({
+    required this.isSubscription,
+    this.completer,
+    this.subject});
 
-  final Completer completer;
+  final Completer<dynamic>? completer;
-  final BehaviorSubject subject;
+  final BehaviorSubject<dynamic>? subject;
   final bool isSubscription;
 }
 
@@ -36,18 +43,18 @@ class ElectrumClient {
   static const aliveTimerDuration = Duration(seconds: 2);
 
   bool get isConnected => _isConnected;
-  Socket socket;
+  Socket? socket;
-  void Function(bool) onConnectionStatusChange;
+  void Function(bool)? onConnectionStatusChange;
   int _id;
   final Map<String, SocketTask> _tasks;
   bool _isConnected;
-  Timer _aliveTimer;
+  Timer? _aliveTimer;
   String unterminatedString;
 
   Future<void> connectToUri(Uri uri) async =>
     await connect(host: uri.host, port: uri.port);
 
-  Future<void> connect({@required String host, @required int port}) async {
+  Future<void> connect({required String host, required int port}) async {
     try {
       await socket?.close();
     } catch (_) {}
@@ -56,10 +63,11 @@ class ElectrumClient {
         timeout: connectionTimeout, onBadCertificate: (_) => true);
     _setIsConnected(true);
 
-    socket.listen((Uint8List event) {
+    socket!.listen((Uint8List event) {
       try {
+        final msg = utf8.decode(event.toList());
         final response =
-            json.decode(utf8.decode(event.toList())) as Map<String, Object>;
+            json.decode(msg) as Map<String, dynamic>;
         _handleResponse(response);
       } on FormatException catch (e) {
         final msg = e.message.toLowerCase();
@@ -75,12 +83,12 @@ class ElectrumClient {
 
         if (isJSONStringCorrect(unterminatedString)) {
           final response =
-              json.decode(unterminatedString) as Map<String, Object>;
+              json.decode(unterminatedString) as Map<String, dynamic>;
           _handleResponse(response);
           unterminatedString = '';
         }
       } on TypeError catch (e) {
-        if (!e.toString().contains('Map<String, Object>')) {
+        if (!e.toString().contains('Map<String, Object>') || !e.toString().contains('Map<String, dynamic>')) {
           return;
         }
 
@@ -89,9 +97,10 @@ class ElectrumClient {
 
         if (isJSONStringCorrect(unterminatedString)) {
           final response =
-              json.decode(unterminatedString) as Map<String, Object>;
+              json.decode(unterminatedString) as Map<String, dynamic>;
           _handleResponse(response);
-          unterminatedString = null;
+          // unterminatedString = null;
+          unterminatedString = '';
         }
       } catch (e) {
         print(e.toString());
@@ -128,14 +137,14 @@ class ElectrumClient {
         return [];
       });
 
-  Future<Map<String, Object>> getBalance(String scriptHash) =>
+  Future<Map<String, dynamic>> getBalance(String scriptHash) =>
       call(method: 'blockchain.scripthash.get_balance', params: [scriptHash])
           .then((dynamic result) {
-        if (result is Map<String, Object>) {
+        if (result is Map<String, dynamic>) {
           return result;
         }
 
-        return <String, Object>{};
+        return <String, dynamic>{};
       });
 
   Future<List<Map<String, dynamic>>> getHistory(String scriptHash) =>
@@ -143,11 +152,11 @@ class ElectrumClient {
           .then((dynamic result) {
         if (result is List) {
           return result.map((dynamic val) {
-            if (val is Map<String, Object>) {
+            if (val is Map<String, dynamic>) {
               return val;
             }
 
-            return <String, Object>{};
+            return <String, dynamic>{};
           }).toList();
         }
 
@@ -162,12 +171,12 @@ class ElectrumClient {
           .then((dynamic result) {
         if (result is List) {
           return result.map((dynamic val) {
-            if (val is Map<String, Object>) {
+            if (val is Map<String, dynamic>) {
               val['address'] = address;
               return val;
             }
 
-            return <String, Object>{};
+            return <String, dynamic>{};
           }).toList();
         }
 
@@ -179,11 +188,11 @@ class ElectrumClient {
           .then((dynamic result) {
         if (result is List) {
           return result.map((dynamic val) {
-            if (val is Map<String, Object>) {
+            if (val is Map<String, dynamic>) {
               return val;
             }
 
-            return <String, Object>{};
+            return <String, dynamic>{};
           }).toList();
         }
 
@@ -195,30 +204,30 @@ class ElectrumClient {
           .then((dynamic result) {
         if (result is List) {
           return result.map((dynamic val) {
-            if (val is Map<String, Object>) {
+            if (val is Map<String, dynamic>) {
               return val;
             }
 
-            return <String, Object>{};
+            return <String, dynamic>{};
           }).toList();
         }
 
         return [];
       });
 
-  Future<Map<String, Object>> getTransactionRaw(
+  Future<Map<String, dynamic>> getTransactionRaw(
-          {@required String hash}) async =>
+          {required String hash}) async =>
       call(method: 'blockchain.transaction.get', params: [hash, true])
           .then((dynamic result) {
-        if (result is Map<String, Object>) {
+        if (result is Map<String, dynamic>) {
           return result;
         }
 
-        return <String, Object>{};
+        return <String, dynamic>{};
       });
 
   Future<String> getTransactionHex(
-          {@required String hash}) async =>
+          {required String hash}) async =>
       call(method: 'blockchain.transaction.get', params: [hash, false])
           .then((dynamic result) {
         if (result is String) {
@@ -229,7 +238,7 @@ class ElectrumClient {
       });
 
   Future<String> broadcastTransaction(
-          {@required String transactionRaw}) async =>
+          {required String transactionRaw}) async =>
       call(method: 'blockchain.transaction.broadcast', params: [transactionRaw])
           .then((dynamic result) {
         if (result is String) {
@@ -240,16 +249,16 @@ class ElectrumClient {
       });
 
   Future<Map<String, dynamic>> getMerkle(
-          {@required String hash, @required int height}) async =>
+          {required String hash, required int height}) async =>
       await call(
           method: 'blockchain.transaction.get_merkle',
           params: [hash, height]) as Map<String, dynamic>;
 
-  Future<Map<String, dynamic>> getHeader({@required int height}) async =>
+  Future<Map<String, dynamic>> getHeader({required int height}) async =>
       await call(method: 'blockchain.block.get_header', params: [height])
           as Map<String, dynamic>;
 
-  Future<double> estimatefee({@required int p}) =>
+  Future<double> estimatefee({required int p}) =>
       call(method: 'blockchain.estimatefee', params: [p])
           .then((dynamic result) {
         if (result is double) {
@@ -266,13 +275,26 @@ class ElectrumClient {
   Future<List<List<int>>> feeHistogram() =>
       call(method: 'mempool.get_fee_histogram').then((dynamic result) {
         if (result is List) {
-          return result.map((dynamic e) {
+          // return result.map((dynamic e) {
-            if (e is List) {
+          //   if (e is List) {
-              return e.map((dynamic ee) => ee is int ? ee : null).toList();
+          //     return e.map((dynamic ee) => ee is int ? ee : null).toList();
-            }
+          //   }
 
-            return null;
+          //   return null;
-          }).toList();
+          // }).toList();
+          final histogram = <List<int>>[];
+          for (final e in result) {
+            if (e is List) {
+              final eee = <int>[];
+              for (final ee in e) {
+                if (ee is int) {
+                  eee.add(ee);
+                }
+              }
+              histogram.add(eee);
+            }
+          }
+          return histogram;
         }
 
         return [];
@@ -299,7 +321,7 @@ class ElectrumClient {
     }
   }
 
-  BehaviorSubject<Object> scripthashUpdate(String scripthash) {
+  BehaviorSubject<Object>? scripthashUpdate(String scripthash) {
     _id += 1;
     return subscribe<Object>(
         id: 'blockchain.scripthash.subscribe:$scripthash',
@@ -307,14 +329,14 @@ class ElectrumClient {
         params: [scripthash]);
   }
 
-  BehaviorSubject<T> subscribe<T>(
+  BehaviorSubject<T>? subscribe<T>(
-      {@required String id,
+      {required String id,
-      @required String method,
+      required String method,
       List<Object> params = const []}) {
     try {
       final subscription = BehaviorSubject<T>();
       _regisrySubscription(id, subscription);
-      socket.write(jsonrpc(method: method, id: _id, params: params));
+      socket!.write(jsonrpc(method: method, id: _id, params: params));
 
       return subscription;
     } catch(e) {
@@ -323,18 +345,18 @@ class ElectrumClient {
     }
   }
 
-  Future<dynamic> call({String method, List<Object> params = const []}) async {
+  Future<dynamic> call({required String method, List<Object> params = const []}) async {
     final completer = Completer<dynamic>();
     _id += 1;
     final id = _id;
     _registryTask(id, completer);
-    socket.write(jsonrpc(method: method, id: id, params: params));
+    socket!.write(jsonrpc(method: method, id: id, params: params));
 
     return completer.future;
   }
 
   Future<dynamic> callWithTimeout(
-      {String method,
+      {required String method,
       List<Object> params = const [],
       int timeout = 2000}) async {
     try {
@@ -342,7 +364,7 @@ class ElectrumClient {
       _id += 1;
       final id = _id;
       _registryTask(id, completer);
-      socket.write(jsonrpc(method: method, id: id, params: params));
+      socket!.write(jsonrpc(method: method, id: id, params: params));
       Timer(Duration(milliseconds: timeout), () {
         if (!completer.isCompleted) {
           completer.completeError(RequestFailedTimeoutException(method, id));
@@ -356,35 +378,35 @@ class ElectrumClient {
   }
 
   Future<void> close() async {
-    _aliveTimer.cancel();
+    _aliveTimer?.cancel();
-    await socket.close();
+    await socket?.close();
     onConnectionStatusChange = null;
   }
 
-  void _registryTask(int id, Completer completer) => _tasks[id.toString()] =
+  void _registryTask(int id, Completer<dynamic> completer) => _tasks[id.toString()] =
       SocketTask(completer: completer, isSubscription: false);
 
-  void _regisrySubscription(String id, BehaviorSubject subject) =>
+  void _regisrySubscription(String id, BehaviorSubject<dynamic> subject) =>
       _tasks[id] = SocketTask(subject: subject, isSubscription: true);
 
-  void _finish(String id, Object data) {
+  void _finish(String id, Object? data) {
     if (_tasks[id] == null) {
       return;
     }
 
     if (!(_tasks[id]?.completer?.isCompleted ?? false)) {
-      _tasks[id]?.completer?.complete(data);
+      _tasks[id]?.completer!.complete(data);
     }
 
     if (!(_tasks[id]?.isSubscription ?? false)) {
-      _tasks[id] = null;
+      _tasks.remove(id);
     } else {
-      _tasks[id].subject.add(data);
+      _tasks[id]?.subject?.add(data);
     }
   }
 
   void _methodHandler(
-      {@required String method, @required Map<String, Object> request}) {
+      {required String method, required Map<String, dynamic> request}) {
     switch (method) {
       case 'blockchain.scripthash.subscribe':
         final params = request['params'] as List<dynamic>;
@@ -406,7 +428,7 @@ class ElectrumClient {
     _isConnected = isConnected;
   }
 
-  void _handleResponse(Map<String, Object> response) {
+  void _handleResponse(Map<String, dynamic> response) {
     final method = response['method'];
     final id = response['id'] as String;
     final result = response['result'];

cw_bitcoin/lib/electrum_balance.dart

@@ -4,10 +4,10 @@ import 'package:cw_bitcoin/bitcoin_amount_format.dart';
 import 'package:cw_core/balance.dart';
 
 class ElectrumBalance extends Balance {
-  const ElectrumBalance({@required this.confirmed, @required this.unconfirmed})
+  const ElectrumBalance({required this.confirmed, required this.unconfirmed})
       : super(confirmed, unconfirmed);
 
-  factory ElectrumBalance.fromJSON(String jsonSource) {
+  static ElectrumBalance? fromJSON(String? jsonSource) {
     if (jsonSource == null) {
       return null;
     }
@@ -15,8 +15,8 @@ class ElectrumBalance extends Balance {
     final decoded = json.decode(jsonSource) as Map;
 
     return ElectrumBalance(
-        confirmed: decoded['confirmed'] as int ?? 0,
+        confirmed: decoded['confirmed'] as int? ?? 0,
-        unconfirmed: decoded['unconfirmed'] as int ?? 0);
+        unconfirmed: decoded['unconfirmed'] as int? ?? 0);
   }
 
   final int confirmed;

cw_bitcoin/lib/electrum_transaction_history.dart

@@ -17,7 +17,7 @@ class ElectrumTransactionHistory = ElectrumTransactionHistoryBase
 abstract class ElectrumTransactionHistoryBase
     extends TransactionHistoryBase<ElectrumTransactionInfo> with Store {
   ElectrumTransactionHistoryBase(
-      {@required this.walletInfo, @required String password})
+      {required this.walletInfo, required String password})
       : _password = password,
         _height = 0 {
     transactions = ObservableMap<String, ElectrumTransactionInfo>();
@@ -56,18 +56,18 @@ abstract class ElectrumTransactionHistoryBase
     await save();
   }
 
-  Future<Map<String, Object>> _read() async {
+  Future<Map<String, dynamic>> _read() async {
     final dirPath =
         await pathForWalletDir(name: walletInfo.name, type: walletInfo.type);
     final path = '$dirPath/$_transactionsHistoryFileName';
     final content = await read(path: path, password: _password);
-    return json.decode(content) as Map<String, Object>;
+    return json.decode(content) as Map<String, dynamic>;
   }
 
   Future<void> _load() async {
     try {
       final content = await _read();
-      final txs = content['transactions'] as Map<String, Object> ?? {};
+      final txs = content['transactions'] as Map<String, dynamic> ?? {};
 
       txs.entries.forEach((entry) {
         final val = entry.value;
@@ -93,11 +93,11 @@ abstract class ElectrumTransactionHistoryBase
       transactions[transaction.id] = transaction;
     } else {
       final originalTx = transactions[transaction.id];
-      originalTx.confirmations = transaction.confirmations;
+      originalTx?.confirmations = transaction.confirmations;
-      originalTx.amount = transaction.amount;
+      originalTx?.amount = transaction.amount;
-      originalTx.height = transaction.height;
+      originalTx?.height = transaction.height;
-      originalTx.date ??= transaction.date;
+      originalTx?.date ??= transaction.date;
-      originalTx.isPending = transaction.isPending;
+      originalTx?.isPending = transaction.isPending;
     }
   }
 }

cw_bitcoin/lib/electrum_transaction_info.dart

@@ -10,23 +10,26 @@ import 'package:cw_core/format_amount.dart';
 import 'package:cw_core/wallet_type.dart';
 
 class ElectrumTransactionBundle {
-  ElectrumTransactionBundle(this.originalTransaction, {this.ins, this.time, this.confirmations});
+  ElectrumTransactionBundle(this.originalTransaction,
+    {required this.ins,
+    required this.confirmations,
+    this.time});
   final bitcoin.Transaction originalTransaction;
   final List<bitcoin.Transaction> ins;
-  final int time;
+  final int? time;
   final int confirmations;
 }
 
 class ElectrumTransactionInfo extends TransactionInfo {
   ElectrumTransactionInfo(this.type,
-      {@required String id,
+      {required String id,
-      @required int height,
+      required int height,
-      @required int amount,
+      required int amount,
-      @required int fee,
+      int? fee,
-      @required TransactionDirection direction,
+      required TransactionDirection direction,
-      @required bool isPending,
+      required bool isPending,
-      @required DateTime date,
+      required DateTime date,
-      @required int confirmations}) {
+      required int confirmations}) {
     this.id = id;
     this.height = height;
     this.amount = amount;
@@ -39,15 +42,15 @@ class ElectrumTransactionInfo extends TransactionInfo {
 
   factory ElectrumTransactionInfo.fromElectrumVerbose(
       Map<String, Object> obj, WalletType type,
-      {@required List<BitcoinAddressRecord> addresses, @required int height}) {
+      {required List<BitcoinAddressRecord> addresses, required int height}) {
     final addressesSet = addresses.map((addr) => addr.address).toSet();
     final id = obj['txid'] as String;
-    final vins = obj['vin'] as List<Object> ?? [];
+    final vins = obj['vin'] as List<Object>? ?? [];
-    final vout = (obj['vout'] as List<Object> ?? []);
+    final vout = (obj['vout'] as List<Object>? ?? []);
     final date = obj['time'] is int
         ? DateTime.fromMillisecondsSinceEpoch((obj['time'] as int) * 1000)
         : DateTime.now();
-    final confirmations = obj['confirmations'] as int ?? 0;
+    final confirmations = obj['confirmations'] as int? ?? 0;
     var direction = TransactionDirection.incoming;
     var inputsAmount = 0;
     var amount = 0;
@@ -57,21 +60,21 @@ class ElectrumTransactionInfo extends TransactionInfo {
       final vout = vin['vout'] as int;
       final out = vin['tx']['vout'][vout] as Map;
       final outAddresses =
-          (out['scriptPubKey']['addresses'] as List<Object>)?.toSet();
+          (out['scriptPubKey']['addresses'] as List<Object>?)?.toSet();
       inputsAmount +=
-          stringDoubleToBitcoinAmount((out['value'] as double ?? 0).toString());
+          stringDoubleToBitcoinAmount((out['value'] as double? ?? 0).toString());
 
-      if (outAddresses?.intersection(addressesSet)?.isNotEmpty ?? false) {
+      if (outAddresses?.intersection(addressesSet).isNotEmpty ?? false) {
         direction = TransactionDirection.outgoing;
       }
     }
 
     for (dynamic out in vout) {
       final outAddresses =
-          out['scriptPubKey']['addresses'] as List<Object> ?? [];
+          out['scriptPubKey']['addresses'] as List<Object>? ?? [];
       final ntrs = outAddresses.toSet().intersection(addressesSet);
       final value = stringDoubleToBitcoinAmount(
-          (out['value'] as double ?? 0.0).toString());
+          (out['value'] as double? ?? 0.0).toString());
       totalOutAmount += value;
 
       if ((direction == TransactionDirection.incoming && ntrs.isNotEmpty) ||
@@ -97,10 +100,10 @@ class ElectrumTransactionInfo extends TransactionInfo {
       ElectrumTransactionBundle bundle,
       WalletType type,
       bitcoin.NetworkType networkType,
-      {@required Set<String> addresses,
+      {required Set<String> addresses,
-        int height}) {
+        required int height}) {
     final date = bundle.time != null
-      ? DateTime.fromMillisecondsSinceEpoch(bundle.time * 1000)
+      ? DateTime.fromMillisecondsSinceEpoch(bundle.time! * 1000)
       : DateTime.now();
     var direction = TransactionDirection.incoming;
     var amount = 0;
@@ -111,21 +114,21 @@ class ElectrumTransactionInfo extends TransactionInfo {
       final input = bundle.originalTransaction.ins[i];
       final inputTransaction = bundle.ins[i];
       final vout = input.index;
-      final outTransaction = inputTransaction.outs[vout];
+      final outTransaction = inputTransaction.outs[vout!];
-      final address = addressFromOutput(outTransaction.script, networkType);
+      final address = addressFromOutput(outTransaction.script!, networkType);
-      inputAmount += outTransaction.value;
+      inputAmount += outTransaction.value!;
       if (addresses.contains(address)) {
         direction = TransactionDirection.outgoing;
       }
     }
 
     for (final out in bundle.originalTransaction.outs) {
-      totalOutAmount += out.value;
+      totalOutAmount += out.value!;
-      final address = addressFromOutput(out.script, networkType);
+      final address = addressFromOutput(out.script!, networkType);
       final addressExists = addresses.contains(address);
       if ((direction == TransactionDirection.incoming && addressExists) ||
           (direction == TransactionDirection.outgoing && !addressExists)) {
-        amount += out.value;
+        amount += out.value!;
       }
     }
 
@@ -142,7 +145,7 @@ class ElectrumTransactionInfo extends TransactionInfo {
   }
 
   factory ElectrumTransactionInfo.fromHexAndHeader(WalletType type, String hex,
-      {List<String> addresses, int height, int timestamp, int confirmations}) {
+      {List<String>? addresses, required int height, int? timestamp, required int confirmations}) {
     final tx = bitcoin.Transaction.fromHex(hex);
     var exist = false;
     var amount = 0;
@@ -155,7 +158,7 @@ class ElectrumTransactionInfo extends TransactionInfo {
           exist = addresses.contains(p2pkh.data.address);
 
           if (exist) {
-            amount += out.value;
+            amount += out.value!;
           }
         } catch (_) {}
       });
@@ -191,15 +194,15 @@ class ElectrumTransactionInfo extends TransactionInfo {
 
   final WalletType type;
 
-  String _fiatAmount;
+  String? _fiatAmount;
 
   @override
   String amountFormatted() =>
       '${formatAmount(bitcoinAmountToString(amount: amount))} ${walletTypeToCryptoCurrency(type).title}';
 
   @override
-  String feeFormatted() => fee != null
+  String? feeFormatted() => fee != null
-      ? '${formatAmount(bitcoinAmountToString(amount: fee))} ${walletTypeToCryptoCurrency(type).title}'
+      ? '${formatAmount(bitcoinAmountToString(amount: fee!))} ${walletTypeToCryptoCurrency(type).title}'
       : '';
 
   @override
@@ -225,7 +228,9 @@ class ElectrumTransactionInfo extends TransactionInfo {
     m['id'] = id;
     m['height'] = height;
     m['amount'] = amount;
-    m['direction'] = direction.index;
+    // FIX-ME: Hardcoded value
+    // m['direction'] = direction.index;
+    m['direction'] = 0;
     m['date'] = date.millisecondsSinceEpoch;
     m['isPending'] = isPending;
     m['confirmations'] = confirmations;

cw_bitcoin/lib/electrum_wallet.dart

@@ -34,6 +34,7 @@ import 'package:cw_core/wallet_info.dart';
 import 'package:cw_bitcoin/electrum.dart';
 import 'package:hex/hex.dart';
 import 'package:cw_core/crypto_currency.dart';
+import 'package:collection/collection.dart';
 
 part 'electrum_wallet.g.dart';
 
@@ -42,31 +43,34 @@ class ElectrumWallet = ElectrumWalletBase with _$ElectrumWallet;
 abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
     ElectrumTransactionHistory, ElectrumTransactionInfo> with Store {
   ElectrumWalletBase(
-      {@required String password,
+      {required String password,
-      @required WalletInfo walletInfo,
+      required WalletInfo walletInfo,
-      @required Box<UnspentCoinsInfo> unspentCoinsInfo,
+      required Box<UnspentCoinsInfo> unspentCoinsInfo,
-      @required List<BitcoinAddressRecord> initialAddresses,
+      required this.networkType,
-      @required this.networkType,
+      required this.mnemonic,
-      @required this.mnemonic,
+      required Uint8List seedBytes,
-      ElectrumClient electrumClient,
+      List<BitcoinAddressRecord>? initialAddresses,
-      ElectrumBalance initialBalance})
+      ElectrumClient? electrumClient,
-      : hd = bitcoin.HDWallet.fromSeed(mnemonicToSeedBytes(mnemonic),
+      ElectrumBalance? initialBalance,
-                network: networkType)
+      CryptoCurrency? currency})
+      : hd = bitcoin.HDWallet.fromSeed(seedBytes, network: networkType)
             .derivePath("m/0'/0"),
         syncStatus = NotConnectedSyncStatus(),
         _password = password,
         _feeRates = <int>[],
         _isTransactionUpdating = false,
+        unspentCoins = [],
+        _scripthashesUpdateSubject = {},
+        balance = ObservableMap<CryptoCurrency, ElectrumBalance>.of(
+          currency != null
+           ? {currency: initialBalance ?? const ElectrumBalance(confirmed: 0, unconfirmed: 0)}
+           : {}),
+        this.unspentCoinsInfo = unspentCoinsInfo,
         super(walletInfo) {
-    balance = ObservableMap<CryptoCurrency, ElectrumBalance>.of({
-          currency: initialBalance ?? const ElectrumBalance(confirmed: 0, unconfirmed: 0)});
     this.electrumClient = electrumClient ?? ElectrumClient();
     this.walletInfo = walletInfo;
-    this.unspentCoinsInfo = unspentCoinsInfo;
     transactionHistory =
         ElectrumTransactionHistory(walletInfo: walletInfo, password: password);
-    unspentCoins = [];
-    _scripthashesUpdateSubject = {};
   }
 
   static int estimatedTransactionSize(int inputsCount, int outputsCounts) =>
@@ -75,15 +79,15 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
   final bitcoin.HDWallet hd;
   final String mnemonic;
 
-  ElectrumClient electrumClient;
+  late ElectrumClient electrumClient;
   Box<UnspentCoinsInfo> unspentCoinsInfo;
 
   @override
-  ElectrumWalletAddresses walletAddresses;
+  late ElectrumWalletAddresses walletAddresses;
 
   @override
   @observable
-  ObservableMap<CryptoCurrency, ElectrumBalance> balance;
+  late ObservableMap<CryptoCurrency, ElectrumBalance> balance;
 
   @override
   @observable
@@ -98,7 +102,7 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
     .map((addr) => scriptHash(addr.address, networkType: networkType))
     .toList();
 
-  String get xpub => hd.base58;
+  String get xpub => hd.base58!;
 
   @override
   String get seed => mnemonic;
@@ -107,12 +111,12 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
 
   @override
   BitcoinWalletKeys get keys => BitcoinWalletKeys(
-      wif: hd.wif, privateKey: hd.privKey, publicKey: hd.pubKey);
+      wif: hd.wif!, privateKey: hd.privKey!, publicKey: hd.pubKey!);
 
   String _password;
   List<BitcoinUnspent> unspentCoins;
   List<int> _feeRates;
-  Map<String, BehaviorSubject<Object>> _scripthashesUpdateSubject;
+  Map<String, BehaviorSubject<Object>?> _scripthashesUpdateSubject;
   bool _isTransactionUpdating;
 
   Future<void> init() async {
@@ -137,7 +141,8 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
           (timer) async => _feeRates = await electrumClient.feeRates());
 
       syncStatus = SyncedSyncStatus();
-    } catch (e) {
+    } catch (e, stacktrace) {
+      print(stacktrace);
       print(e.toString());
       syncStatus = FailedSyncStatus();
     }
@@ -145,7 +150,7 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
 
   @action
   @override
-  Future<void> connectToNode({@required Node node}) async {
+  Future<void> connectToNode({required Node node}) async {
     try {
       syncStatus = ConnectingSyncStatus();
       await electrumClient.connectToUri(node.uri);
@@ -187,7 +192,7 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
     }
 
     final allAmountFee = feeAmountForPriority(
-        transactionCredentials.priority, inputs.length, outputs.length);
+        transactionCredentials.priority!, inputs.length, outputs.length);
     final allAmount = allInputsAmount - allAmountFee;
 
     var credentialsAmount = 0;
@@ -196,12 +201,12 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
 
     if (hasMultiDestination) {
       if (outputs.any((item) => item.sendAll
-          || item.formattedCryptoAmount <= 0)) {
+          || item.formattedCryptoAmount! <= 0)) {
         throw BitcoinTransactionWrongBalanceException(currency);
       }
 
       credentialsAmount = outputs.fold(0, (acc, value) =>
-          acc + value.formattedCryptoAmount);
+          acc + value.formattedCryptoAmount!);
 
       if (allAmount - credentialsAmount < minAmount) {
         throw BitcoinTransactionWrongBalanceException(currency);
@@ -210,7 +215,7 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
       amount = credentialsAmount;
 
       if (transactionCredentials.feeRate != null) {
-        fee = calculateEstimatedFeeWithFeeRate(transactionCredentials.feeRate, amount,
+        fee = calculateEstimatedFeeWithFeeRate(transactionCredentials.feeRate!, amount,
             outputsCount: outputs.length + 1);
       } else {
         fee = calculateEstimatedFee(transactionCredentials.priority, amount,
@@ -219,7 +224,7 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
     } else {
       final output = outputs.first;
       credentialsAmount = !output.sendAll
-          ? output.formattedCryptoAmount
+          ? output.formattedCryptoAmount!
           : 0;
 
       if (credentialsAmount > allAmount) {
@@ -233,7 +238,7 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
       if (output.sendAll || amount == allAmount) {
         fee = allAmountFee;
       } else if (transactionCredentials.feeRate != null) {
-        fee = calculateEstimatedFeeWithFeeRate(transactionCredentials.feeRate, amount);
+        fee = calculateEstimatedFeeWithFeeRate(transactionCredentials.feeRate!, amount);
       } else {
         fee = calculateEstimatedFee(transactionCredentials.priority, amount);
       }
@@ -245,7 +250,7 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
 
     final totalAmount = amount + fee;
 
-    if (totalAmount > balance[currency].confirmed || totalAmount > allInputsAmount) {
+    if (totalAmount > balance[currency]!.confirmed || totalAmount > allInputsAmount) {
       throw BitcoinTransactionWrongBalanceException(currency);
     }
 
@@ -298,11 +303,11 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
           ? item.formattedCryptoAmount
           : amount;
       final outputAddress = item.isParsedAddress
-          ? item.extractedAddress
+          ? item.extractedAddress!
           : item.address;
       txb.addOutput(
           addressToOutputScript(outputAddress, networkType),
-          outputAmount);
+          outputAmount!);
     });
 
     final estimatedSize =
@@ -310,9 +315,9 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
     var feeAmount = 0;
 
     if (transactionCredentials.feeRate != null) {
-      feeAmount = transactionCredentials.feeRate * estimatedSize;
+      feeAmount = transactionCredentials.feeRate! * estimatedSize;
     } else {
-      feeAmount = feeRate(transactionCredentials.priority) * estimatedSize;
+      feeAmount = feeRate(transactionCredentials.priority!) * estimatedSize;
     }
     
     final changeValue = totalInputAmount - amount - feeAmount;
@@ -369,8 +374,8 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
       feeRate * estimatedTransactionSize(inputsCount, outputsCount);
 
   @override
-  int calculateEstimatedFee(TransactionPriority priority, int amount,
+  int calculateEstimatedFee(TransactionPriority? priority, int? amount,
-  {int outputsCount}) {
+    {int? outputsCount}) {
     if (priority is BitcoinTransactionPriority) {
       return calculateEstimatedFeeWithFeeRate(
         feeRate(priority),
@@ -381,8 +386,8 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
     return 0;
   }
 
-  int calculateEstimatedFeeWithFeeRate(int feeRate, int amount,
+  int calculateEstimatedFeeWithFeeRate(int feeRate, int? amount,
-  {int outputsCount}) {
+  {int? outputsCount}) {
     int inputsCount = 0;
 
     if (amount != null) {
@@ -429,16 +434,16 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
     await transactionHistory.changePassword(password);
   }
 
-  bitcoin.ECPair keyPairFor({@required int index}) =>
+  bitcoin.ECPair keyPairFor({required int index}) =>
       generateKeyPair(hd: hd, index: index, network: networkType);
 
   @override
-  Future<void> rescan({int height}) async => throw UnimplementedError();
+  Future<void> rescan({required int height}) async => throw UnimplementedError();
 
   @override
   Future<void> close() async {
     try {
-      await electrumClient?.close();
+      await electrumClient.close();
     } catch (_) {}
   }
 
@@ -450,7 +455,13 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
         .addresses.map((address) => electrumClient
         .getListUnspentWithAddress(address.address, networkType)
         .then((unspent) => unspent
-            .map((unspent) => BitcoinUnspent.fromJSON(address, unspent)))));
+            .map((unspent) {
+              try {
+                return BitcoinUnspent.fromJSON(address, unspent);
+              } catch(_) {
+                return null;
+              }
+            }).whereNotNull())));
     unspentCoins = unspent.expand((e) => e).toList();
 
     if (unspentCoinsInfo.isEmpty) {
@@ -498,10 +509,9 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
 
       if (currentWalletUnspentCoins.isNotEmpty) {
         currentWalletUnspentCoins.forEach((element) {
-          final existUnspentCoins = unspentCoins
+          final existUnspentCoins = unspentCoins.where((coin) => element.hash.contains(coin.hash));
-              ?.where((coin) => element.hash.contains(coin?.hash));
 
-          if (existUnspentCoins?.isEmpty ?? true) {
+          if (existUnspentCoins.isEmpty) {
             keys.add(element.key);
           }
         });
@@ -516,7 +526,7 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
   }
 
   Future<ElectrumTransactionBundle> getTransactionExpanded(
-      {@required String hash, @required int height}) async {
+      {required String hash, required int height}) async {
     final verboseTransaction = await electrumClient.getTransactionRaw(hash: hash);
     final transactionHex = verboseTransaction['hex'] as String;
     final original = bitcoin.Transaction.fromHex(transactionHex);
@@ -525,7 +535,7 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
     final confirmations = verboseTransaction['confirmations'] as int ?? 0;
 
     for (final vin in original.ins) {
-      final id = HEX.encode(vin.hash.reversed.toList());
+      final id = HEX.encode(vin.hash!.reversed.toList());
       final txHex = await electrumClient.getTransactionHex(hash: id);
       final tx = bitcoin.Transaction.fromHex(txHex);
       ins.add(tx);
@@ -538,8 +548,9 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
       confirmations: confirmations);
   }
 
-  Future<ElectrumTransactionInfo> fetchTransactionInfo(
+  Future<ElectrumTransactionInfo?> fetchTransactionInfo(
-      {@required String hash, @required int height}) async {
+      {required String hash, required int height}) async {
+        try {
     final tx = await getTransactionExpanded(hash: hash, height: height);
     final addresses = walletAddresses.addresses.map((addr) => addr.address).toSet();
     return ElectrumTransactionInfo.fromElectrumBundle(
@@ -548,6 +559,9 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
       networkType,
       addresses: addresses,
       height: height);
+      } catch(_) {
+        return null;
+      }
   }
 
   @override
@@ -567,19 +581,27 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
       history.entries.forEach((historyItem) {
         if (historyItem.value.isNotEmpty) {
           final address = addressHashes[historyItem.key];
-          address.setAsUsed();
+          address?.setAsUsed();
           normalizedHistories.addAll(historyItem.value);
         }
       });
     });
     final historiesWithDetails = await Future.wait(
       normalizedHistories
-        .map((transaction) => fetchTransactionInfo(
+        .map((transaction) {
-            hash: transaction['tx_hash'] as String,
+          try {
-            height: transaction['height'] as int)));
+            return fetchTransactionInfo(
-
+              hash: transaction['tx_hash'] as String,
+              height: transaction['height'] as int);
+          } catch(_) {
+            return Future.value(null);
+          }
+        }));
     return historiesWithDetails.fold<Map<String, ElectrumTransactionInfo>>(
         <String, ElectrumTransactionInfo>{}, (acc, tx) {
+      if (tx == null) {
+        return acc;
+      }
       acc[tx.id] = acc[tx.id]?.updated(tx) ?? tx;
       return acc;
     });
@@ -597,7 +619,8 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
       walletAddresses.updateReceiveAddresses();
       await transactionHistory.save();
       _isTransactionUpdating = false;
-    } catch (e) {
+    } catch (e, stacktrace) {
+      print(stacktrace);
       print(e);
       _isTransactionUpdating = false;
     }
@@ -637,8 +660,8 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
     for (var i = 0; i < balances.length; i++) {
       final addressRecord = addresses[i];
       final balance = balances[i];
-      final confirmed = balance['confirmed'] as int ?? 0;
+      final confirmed = balance['confirmed'] as int? ?? 0;
-      final unconfirmed = balance['unconfirmed'] as int ?? 0;
+      final unconfirmed = balance['unconfirmed'] as int? ?? 0;
       totalConfirmed += confirmed;
       totalUnconfirmed += unconfirmed;
 

cw_bitcoin/lib/electrum_wallet_addresses.dart

@@ -4,7 +4,6 @@ import 'package:cw_bitcoin/electrum.dart';
 import 'package:cw_bitcoin/script_hash.dart';
 import 'package:cw_core/wallet_addresses.dart';
 import 'package:cw_core/wallet_info.dart';
-import 'package:flutter/foundation.dart';
 import 'package:mobx/mobx.dart';
 
 part 'electrum_wallet_addresses.g.dart';
@@ -14,13 +13,13 @@ class ElectrumWalletAddresses = ElectrumWalletAddressesBase
 
 abstract class ElectrumWalletAddressesBase extends WalletAddresses with Store {
   ElectrumWalletAddressesBase(WalletInfo walletInfo,
-      {@required List<BitcoinAddressRecord> initialAddresses,
+      {required this.mainHd,
+      required this.sideHd,
+      required this.electrumClient,
+      required this.networkType,
+      List<BitcoinAddressRecord>? initialAddresses,
       int initialRegularAddressIndex = 0,
-      int initialChangeAddressIndex = 0,
+      int initialChangeAddressIndex = 0})
-      this.mainHd,
-      this.sideHd,
-      this.electrumClient,
-      this.networkType})
       : addresses = ObservableList<BitcoinAddressRecord>.of(
           (initialAddresses ?? []).toSet()),
         receiveAddresses = ObservableList<BitcoinAddressRecord>.of(
@@ -31,10 +30,9 @@ abstract class ElectrumWalletAddressesBase extends WalletAddresses with Store {
           (initialAddresses ?? [])
             .where((addressRecord) => addressRecord.isHidden && !addressRecord.isUsed)
         .toSet()),
-      super(walletInfo) {
+        currentReceiveAddressIndex = initialRegularAddressIndex,
-    currentReceiveAddressIndex = initialRegularAddressIndex;
+        currentChangeAddressIndex = initialChangeAddressIndex,
-    currentChangeAddressIndex = initialChangeAddressIndex;
+      super(walletInfo);
-  }
 
   static const defaultReceiveAddressesCount = 22;
   static const defaultChangeAddressesCount = 17;
@@ -124,17 +122,18 @@ abstract class ElectrumWalletAddressesBase extends WalletAddresses with Store {
   }
 
   Future<BitcoinAddressRecord> generateNewAddress(
-      {bool isHidden = false, bitcoin.HDWallet hd}) async {
+      {bitcoin.HDWallet? hd, bool isHidden = false}) async {
     currentReceiveAddressIndex += 1;
+    // FIX-ME: Check logic for whichi HD should be used here  ???
     final address = BitcoinAddressRecord(
-        getAddress(index: currentReceiveAddressIndex, hd: hd),
+        getAddress(index: currentReceiveAddressIndex, hd: hd ?? sideHd),
         index: currentReceiveAddressIndex,
         isHidden: isHidden);
     addresses.add(address);
     return address;
   }
 
-  String getAddress({@required int index, @required bitcoin.HDWallet hd}) => '';
+  String getAddress({required int index, required bitcoin.HDWallet hd}) => '';
 
   @override
   Future<void> updateAddressesInBox() async {
@@ -239,7 +238,7 @@ abstract class ElectrumWalletAddressesBase extends WalletAddresses with Store {
   }
 
   Future<List<BitcoinAddressRecord>> _createNewAddresses(int count,
-      {int startIndex = 0, bitcoin.HDWallet hd, bool isHidden = false}) async {
+      {required bitcoin.HDWallet hd, int startIndex = 0, bool isHidden = false}) async {
     final list = <BitcoinAddressRecord>[];
 
     for (var i = startIndex; i < count + startIndex; i++) {

cw_bitcoin/lib/electrum_wallet_snapshot.dart

@@ -6,7 +6,15 @@ import 'package:cw_core/pathForWallet.dart';
 import 'package:cw_core/wallet_type.dart';
 
 class ElectrumWallletSnapshot {
-  ElectrumWallletSnapshot(this.name, this.type, this.password);
+  ElectrumWallletSnapshot({
+    required this.name,
+    required this.type,
+    required this.password,
+    required this.mnemonic,
+    required this.addresses,
+    required this.balance,
+    required this.regularAddressIndex,
+    required this.changeAddressIndex});
 
   final String name;
   final String password;
@@ -18,28 +26,34 @@ class ElectrumWallletSnapshot {
   int regularAddressIndex;
   int changeAddressIndex;
 
-  Future<void> load() async {
+  static Future<ElectrumWallletSnapshot> load(String name, WalletType type, String password) async {
-    try {
+    final path = await pathForWallet(name: name, type: type);
-      final path = await pathForWallet(name: name, type: type);
+    final jsonSource = await read(path: path, password: password);
-      final jsonSource = await read(path: path, password: password);
+    final data = json.decode(jsonSource) as Map;
-      final data = json.decode(jsonSource) as Map;
+    final addressesTmp = data['addresses'] as List? ?? <Object>[];
-      final addressesTmp = data['addresses'] as List ?? <Object>[];
+    final mnemonic = data['mnemonic'] as String;
-      mnemonic = data['mnemonic'] as String;
+    final addresses = addressesTmp
-      addresses = addressesTmp
+        .whereType<String>()
-          .whereType<String>()
+        .map((addr) => BitcoinAddressRecord.fromJSON(addr))
-          .map((addr) => BitcoinAddressRecord.fromJSON(addr))
+        .toList();
-          .toList();
+    final balance = ElectrumBalance.fromJSON(data['balance'] as String) ??
-      balance = ElectrumBalance.fromJSON(data['balance'] as String) ??
+        ElectrumBalance(confirmed: 0, unconfirmed: 0);
-          ElectrumBalance(confirmed: 0, unconfirmed: 0);
+    var regularAddressIndex = 0;
-      regularAddressIndex = 0;
+    var changeAddressIndex = 0;
-      changeAddressIndex = 0;
 
-      try {
+    try {
-        regularAddressIndex = int.parse(data['account_index'] as String);
+      regularAddressIndex = int.parse(data['account_index'] as String? ?? '0');
-        changeAddressIndex = int.parse(data['change_address_index'] as String);
+      changeAddressIndex = int.parse(data['change_address_index'] as String? ?? '0');
-      } catch (_) {}
+    } catch (_) {}
-    } catch (e) {
+
-      print(e);
+    return ElectrumWallletSnapshot(
-    }
+      name: name,
+      type: type,
+      password: password,
+      mnemonic: mnemonic,
+      addresses: addresses,
+      balance: balance,
+      regularAddressIndex: regularAddressIndex,
+      changeAddressIndex: changeAddressIndex);
   }
 }

cw_bitcoin/lib/file.dart

@@ -1,12 +1,11 @@
 import 'dart:io';
 import 'package:cw_core/key.dart';
 import 'package:encrypt/encrypt.dart' as encrypt;
-import 'package:flutter/foundation.dart';
 
 Future<void> write(
-    {@required String path,
+    {required String path,
-    @required String password,
+    required String password,
-    @required String data}) async {
+    required String data}) async {
   final keys = extractKeys(password);
   final key = encrypt.Key.fromBase64(keys.first);
   final iv = encrypt.IV.fromBase64(keys.last);
@@ -16,9 +15,9 @@ Future<void> write(
 }
 
 Future<void> writeData(
-    {@required String path,
+    {required String path,
-    @required String password,
+    required String password,
-    @required String data}) async {
+    required String data}) async {
   final keys = extractKeys(password);
   final key = encrypt.Key.fromBase64(keys.first);
   final iv = encrypt.IV.fromBase64(keys.last);
@@ -27,7 +26,7 @@ Future<void> writeData(
   f.writeAsStringSync(encrypted);
 }
 
-Future<String> read({@required String path, @required String password}) async {
+Future<String> read({required String path, required String password}) async {
   final file = File(path);
 
   if (!file.existsSync()) {

cw_bitcoin/lib/litecoin_wallet.dart

@@ -1,5 +1,6 @@
 import 'package:cw_bitcoin/bitcoin_mnemonic.dart';
 import 'package:cw_bitcoin/bitcoin_transaction_priority.dart';
+import 'package:cw_core/crypto_currency.dart';
 import 'package:cw_core/unspent_coins_info.dart';
 import 'package:cw_bitcoin/litecoin_wallet_addresses.dart';
 import 'package:cw_core/transaction_priority.dart';
@@ -20,12 +21,13 @@ class LitecoinWallet = LitecoinWalletBase with _$LitecoinWallet;
 
 abstract class LitecoinWalletBase extends ElectrumWallet with Store {
   LitecoinWalletBase(
-      {@required String mnemonic,
+      {required String mnemonic,
-      @required String password,
+      required String password,
-      @required WalletInfo walletInfo,
+      required WalletInfo walletInfo,
-      @required Box<UnspentCoinsInfo> unspentCoinsInfo,
+      required Box<UnspentCoinsInfo> unspentCoinsInfo,
-      List<BitcoinAddressRecord> initialAddresses,
+      required Uint8List seedBytes,
-      ElectrumBalance initialBalance,
+      List<BitcoinAddressRecord>? initialAddresses,
+      ElectrumBalance? initialBalance,
       int initialRegularAddressIndex = 0,
       int initialChangeAddressIndex = 0})
       : super(
@@ -35,7 +37,9 @@ abstract class LitecoinWalletBase extends ElectrumWallet with Store {
             unspentCoinsInfo: unspentCoinsInfo,
             networkType: litecoinNetwork,
             initialAddresses: initialAddresses,
-            initialBalance: initialBalance) {
+            initialBalance: initialBalance,
+            seedBytes: seedBytes,
+            currency: CryptoCurrency.ltc) {
     walletAddresses = LitecoinWalletAddresses(
         walletInfo,
         electrumClient: electrumClient,
@@ -44,19 +48,40 @@ abstract class LitecoinWalletBase extends ElectrumWallet with Store {
         initialChangeAddressIndex: initialChangeAddressIndex,
         mainHd: hd,
         sideHd: bitcoin.HDWallet
-                .fromSeed(mnemonicToSeedBytes(mnemonic), network: networkType)
+                .fromSeed(seedBytes, network: networkType)
                 .derivePath("m/0'/1"),
         networkType: networkType,);
   }
 
-  static Future<LitecoinWallet> open({
+  static Future<LitecoinWallet> create({
-    @required String name,
+    required String mnemonic,
-    @required WalletInfo walletInfo,
+    required String password,
-    @required Box<UnspentCoinsInfo> unspentCoinsInfo,
+    required WalletInfo walletInfo,
-    @required String password,
+    required Box<UnspentCoinsInfo> unspentCoinsInfo,
+    List<BitcoinAddressRecord>? initialAddresses,
+    ElectrumBalance? initialBalance,
+    int initialRegularAddressIndex = 0,
+    int initialChangeAddressIndex = 0
   }) async {
-    final snp = ElectrumWallletSnapshot(name, walletInfo.type, password);
+    return LitecoinWallet(
-    await snp.load();
+        mnemonic: mnemonic,
+        password: password,
+        walletInfo: walletInfo,
+        unspentCoinsInfo: unspentCoinsInfo,
+        initialAddresses: initialAddresses,
+        initialBalance: initialBalance,
+        seedBytes: await mnemonicToSeedBytes(mnemonic),
+        initialRegularAddressIndex: initialRegularAddressIndex,
+        initialChangeAddressIndex: initialChangeAddressIndex);
+  }
+
+  static Future<LitecoinWallet> open({
+    required String name,
+    required WalletInfo walletInfo,
+    required Box<UnspentCoinsInfo> unspentCoinsInfo,
+    required String password,
+  }) async {
+    final snp = await ElectrumWallletSnapshot.load (name, walletInfo.type, password);
     return LitecoinWallet(
         mnemonic: snp.mnemonic,
         password: password,
@@ -64,6 +89,7 @@ abstract class LitecoinWalletBase extends ElectrumWallet with Store {
         unspentCoinsInfo: unspentCoinsInfo,
         initialAddresses: snp.addresses,
         initialBalance: snp.balance,
+        seedBytes: await mnemonicToSeedBytes(snp.mnemonic),
         initialRegularAddressIndex: snp.regularAddressIndex,
         initialChangeAddressIndex: snp.changeAddressIndex);
   }

cw_bitcoin/lib/litecoin_wallet_addresses.dart

@@ -16,13 +16,13 @@ abstract class LitecoinWalletAddressesBase extends ElectrumWalletAddresses
     with Store {
   LitecoinWalletAddressesBase(
       WalletInfo walletInfo,
-      {@required List<BitcoinAddressRecord> initialAddresses,
+      {required bitcoin.HDWallet mainHd,
+        required bitcoin.HDWallet sideHd,
+        required bitcoin.NetworkType networkType,
+        required ElectrumClient electrumClient,
+        List<BitcoinAddressRecord>? initialAddresses,
         int initialRegularAddressIndex = 0,
-        int initialChangeAddressIndex = 0,
+        int initialChangeAddressIndex = 0})
-        ElectrumClient electrumClient,
-        @required bitcoin.HDWallet mainHd,
-        @required bitcoin.HDWallet sideHd,
-        @required bitcoin.NetworkType networkType})
       : super(
       walletInfo,
       initialAddresses: initialAddresses,
@@ -34,6 +34,6 @@ abstract class LitecoinWalletAddressesBase extends ElectrumWalletAddresses
       networkType: networkType);
 
   @override
-  String getAddress({@required int index, @required bitcoin.HDWallet hd}) =>
+  String getAddress({required int index, required bitcoin.HDWallet hd}) =>
       generateP2WPKHAddress(hd: hd, index: index, networkType: networkType);
 }

cw_bitcoin/lib/litecoin_wallet_service.dart

@@ -10,6 +10,7 @@ import 'package:cw_core/pathForWallet.dart';
 import 'package:cw_core/wallet_type.dart';
 import 'package:cw_core/wallet_info.dart';
 import 'package:cw_core/wallet_base.dart';
+import 'package:collection/collection.dart';
 
 class LitecoinWalletService extends WalletService<
     BitcoinNewWalletCredentials,
@@ -25,10 +26,10 @@ class LitecoinWalletService extends WalletService<
 
   @override
   Future<LitecoinWallet> create(BitcoinNewWalletCredentials credentials) async {
-    final wallet = LitecoinWallet(
+    final wallet = await LitecoinWalletBase.create(
         mnemonic: await generateMnemonic(),
-        password: credentials.password,
+        password: credentials.password!,
-        walletInfo: credentials.walletInfo,
+        walletInfo: credentials.walletInfo!,
         unspentCoinsInfo: unspentCoinsInfoSource);
     await wallet.save();
     await wallet.init();
@@ -42,9 +43,8 @@ class LitecoinWalletService extends WalletService<
 
   @override
   Future<LitecoinWallet> openWallet(String name, String password) async {
-    final walletInfo = walletInfoSource.values.firstWhere(
+    final walletInfo = walletInfoSource.values.firstWhereOrNull(
-        (info) => info.id == WalletBase.idFor(name, getType()),
+        (info) => info.id == WalletBase.idFor(name, getType()))!;
-        orElse: () => null);
     final wallet = await LitecoinWalletBase.open(
         password: password, name: name, walletInfo: walletInfo,
         unspentCoinsInfo: unspentCoinsInfoSource);
@@ -69,10 +69,10 @@ class LitecoinWalletService extends WalletService<
       throw BitcoinMnemonicIsIncorrectException();
     }
 
-    final wallet = LitecoinWallet(
+    final wallet = await LitecoinWalletBase.create(
-        password: credentials.password,
+        password: credentials.password!,
         mnemonic: credentials.mnemonic,
-        walletInfo: credentials.walletInfo,
+        walletInfo: credentials.walletInfo!,
         unspentCoinsInfo: unspentCoinsInfoSource);
     await wallet.save();
     await wallet.init();

cw_bitcoin/lib/pending_bitcoin_transaction.dart

@@ -1,5 +1,4 @@
 import 'package:cw_bitcoin/bitcoin_commit_transaction_exception.dart';
-import 'package:flutter/foundation.dart';
 import 'package:bitcoin_flutter/bitcoin_flutter.dart' as bitcoin;
 import 'package:cw_core/pending_transaction.dart';
 import 'package:cw_bitcoin/electrum.dart';
@@ -10,9 +9,9 @@ import 'package:cw_core/wallet_type.dart';
 
 class PendingBitcoinTransaction with PendingTransaction {
   PendingBitcoinTransaction(this._tx, this.type,
-      {@required this.electrumClient,
+      {required this.electrumClient,
-      @required this.amount,
+      required this.amount,
-      @required this.fee})
+      required this.fee})
       : _listeners = <void Function(ElectrumTransactionInfo transaction)>[];
 
   final WalletType type;

cw_bitcoin/lib/script_hash.dart

@@ -1,8 +1,7 @@
-import 'package:flutter/foundation.dart';
 import 'package:bitcoin_flutter/bitcoin_flutter.dart' as bitcoin;
 import 'package:crypto/crypto.dart';
 
-String scriptHash(String address, {@required bitcoin.NetworkType networkType}) {
+String scriptHash(String address, {required bitcoin.NetworkType networkType}) {
   final outputScript =
       bitcoin.Address.addressToOutputScript(address, networkType);
   final parts = sha256.convert(outputScript).toString().split('');

cw_bitcoin/lib/utils.dart

@@ -5,51 +5,51 @@ import 'package:bitcoin_flutter/src/payments/index.dart' show PaymentData;
 import 'package:hex/hex.dart';
 
 bitcoin.PaymentData generatePaymentData(
-        {@required bitcoin.HDWallet hd, @required int index}) =>
+        {required bitcoin.HDWallet hd, required int index}) =>
     PaymentData(
-        pubkey: Uint8List.fromList(HEX.decode(hd.derive(index).pubKey)));
+        pubkey: Uint8List.fromList(HEX.decode(hd.derive(index).pubKey!)));
 
 bitcoin.ECPair generateKeyPair(
-        {@required bitcoin.HDWallet hd,
+        {required bitcoin.HDWallet hd,
-        @required int index,
+        required int index,
-        bitcoin.NetworkType network}) =>
+        required bitcoin.NetworkType network}) =>
-    bitcoin.ECPair.fromWIF(hd.derive(index).wif, network: network);
+    bitcoin.ECPair.fromWIF(hd.derive(index).wif!, network: network);
 
 String generateP2WPKHAddress(
-        {@required bitcoin.HDWallet hd,
+        {required bitcoin.HDWallet hd,
-        @required int index,
+        required int index,
-        bitcoin.NetworkType networkType}) =>
+        required bitcoin.NetworkType networkType}) =>
     bitcoin
         .P2WPKH(
             data: PaymentData(
                 pubkey:
-                    Uint8List.fromList(HEX.decode(hd.derive(index).pubKey))),
+                    Uint8List.fromList(HEX.decode(hd.derive(index).pubKey!))),
             network: networkType)
         .data
-        .address;
+        .address!;
 
 String generateP2WPKHAddressByPath(
-        {@required bitcoin.HDWallet hd,
+        {required bitcoin.HDWallet hd,
-        @required String path,
+        required String path,
-        bitcoin.NetworkType networkType}) =>
+        required bitcoin.NetworkType networkType}) =>
     bitcoin
         .P2WPKH(
             data: PaymentData(
                 pubkey:
-                    Uint8List.fromList(HEX.decode(hd.derivePath(path).pubKey))),
+                    Uint8List.fromList(HEX.decode(hd.derivePath(path).pubKey!))),
             network: networkType)
         .data
-        .address;
+        .address!;
 
 String generateP2PKHAddress(
-        {@required bitcoin.HDWallet hd,
+        {required bitcoin.HDWallet hd,
-        @required int index,
+        required int index,
-        bitcoin.NetworkType networkType}) =>
+        required bitcoin.NetworkType networkType}) =>
     bitcoin
         .P2PKH(
             data: PaymentData(
                 pubkey:
-                    Uint8List.fromList(HEX.decode(hd.derive(index).pubKey))),
+                    Uint8List.fromList(HEX.decode(hd.derive(index).pubKey!))),
             network: networkType)
         .data
-        .address;
+        .address!;

cw_bitcoin/pubspec.lock

@@ -7,64 +7,64 @@ packages:
       name: _fe_analyzer_shared
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "14.0.0"
+    version: "47.0.0"
   analyzer:
     dependency: transitive
     description:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.41.2"
+    version: "4.7.0"
   args:
     dependency: transitive
     description:
       name: args
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.0"
+    version: "2.3.1"
   asn1lib:
     dependency: transitive
     description:
       name: asn1lib
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.6.5"
+    version: "1.1.1"
   async:
     dependency: transitive
     description:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.5.0"
+    version: "2.9.0"
   bech32:
     dependency: transitive
     description:
       path: "."
-      ref: cake
+      ref: "cake-0.2.1"
-      resolved-ref: "02fef082f20af13de00b4e64efb93a2c1e5e1cf2"
+      resolved-ref: cafd1c270641e95017d57d69f55cca9831d4db56
       url: "https://github.com/cake-tech/bech32.git"
     source: git
-    version: "0.2.0"
+    version: "0.2.1"
   bip32:
     dependency: transitive
     description:
       name: bip32
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.7"
+    version: "2.0.0"
   bip39:
     dependency: transitive
     description:
       name: bip39
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.3"
+    version: "1.0.6"
   bitcoin_flutter:
     dependency: "direct main"
     description:
       path: "."
-      ref: cake
+      ref: cake-update-v2
-      resolved-ref: cbabfd87b6ce3cae6051a3e86ddb56e7a934e188
+      resolved-ref: "8f86453761c0c26e368392d0ff2c6f12f3b7397b"
       url: "https://github.com/cake-tech/bitcoin_flutter.git"
     source: git
     version: "2.0.2"
@@ -81,133 +81,119 @@ packages:
       name: bs58check
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.1"
+    version: "1.0.2"
   build:
     dependency: transitive
     description:
       name: build
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.2"
+    version: "2.3.1"
   build_config:
     dependency: transitive
     description:
       name: build_config
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.6"
+    version: "1.1.0"
   build_daemon:
     dependency: transitive
     description:
       name: build_daemon
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.10"
+    version: "3.1.0"
   build_resolvers:
     dependency: "direct dev"
     description:
       name: build_resolvers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.5.3"
+    version: "2.0.10"
   build_runner:
     dependency: "direct dev"
     description:
       name: build_runner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.11.5"
+    version: "2.2.1"
   build_runner_core:
     dependency: transitive
     description:
       name: build_runner_core
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.1.10"
+    version: "7.2.4"
   built_collection:
     dependency: transitive
     description:
       name: built_collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.3.2"
+    version: "5.1.1"
   built_value:
     dependency: transitive
     description:
       name: built_value
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "7.1.0"
+    version: "8.4.1"
   characters:
     dependency: transitive
     description:
       name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.1"
-  charcode:
-    dependency: transitive
-    description:
-      name: charcode
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.2.0"
   checked_yaml:
     dependency: transitive
     description:
       name: checked_yaml
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.4"
+    version: "2.0.1"
-  cli_util:
-    dependency: transitive
-    description:
-      name: cli_util
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.3.5"
   clock:
     dependency: transitive
     description:
       name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.1.1"
   code_builder:
     dependency: transitive
     description:
       name: code_builder
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.7.0"
+    version: "4.3.0"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.15.0"
+    version: "1.16.0"
   convert:
     dependency: transitive
     description:
       name: convert
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.1"
+    version: "3.0.2"
   crypto:
     dependency: transitive
     description:
       name: crypto
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.5"
+    version: "3.0.2"
   cryptography:
     dependency: "direct main"
     description:
       name: cryptography
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.4.1"
+    version: "2.0.5"
   cw_core:
     dependency: "direct main"
     description:
@@ -221,35 +207,28 @@ packages:
       name: dart_style
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.12"
+    version: "2.2.4"
-  dartx:
-    dependency: transitive
-    description:
-      name: dartx
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.5.0"
   encrypt:
     dependency: "direct main"
     description:
       name: encrypt
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.0.3"
+    version: "5.0.1"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.1"
   ffi:
     dependency: transitive
     description:
       name: ffi
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.2"
+    version: "2.0.1"
   file:
     dependency: transitive
     description:
@@ -263,7 +242,7 @@ packages:
       name: fixnum
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.10.11"
+    version: "1.0.1"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -275,12 +254,19 @@ packages:
       name: flutter_mobx
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0+2"
+    version: "2.0.6+4"
   flutter_test:
     dependency: "direct dev"
     description: flutter
     source: sdk
     version: "0.0.0"
+  frontend_server_client:
+    dependency: transitive
+    description:
+      name: frontend_server_client
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.3"
   glob:
     dependency: transitive
     description:
@@ -294,49 +280,49 @@ packages:
       name: graphs
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.0"
+    version: "2.1.0"
   hex:
     dependency: transitive
     description:
       name: hex
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.2"
+    version: "0.2.0"
   hive:
     dependency: transitive
     description:
       name: hive
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.4.4+1"
+    version: "2.2.3"
   hive_generator:
     dependency: "direct dev"
     description:
       name: hive_generator
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.8.2"
+    version: "1.1.3"
   http:
     dependency: "direct main"
     description:
       name: http
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.2"
+    version: "0.13.5"
   http_multi_server:
     dependency: transitive
     description:
       name: http_multi_server
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "3.2.1"
   http_parser:
     dependency: transitive
     description:
       name: http_parser
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.1.4"
+    version: "4.0.1"
   intl:
     dependency: "direct main"
     description:
@@ -350,7 +336,7 @@ packages:
       name: io
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.5"
+    version: "1.0.3"
   js:
     dependency: transitive
     description:
@@ -364,7 +350,7 @@ packages:
       name: json_annotation
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.0.1"
+    version: "4.7.0"
   logging:
     dependency: transitive
     description:
@@ -378,14 +364,21 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.10"
+    version: "0.12.12"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.5"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0"
+    version: "1.8.0"
   mime:
     dependency: transitive
     description:
@@ -399,63 +392,77 @@ packages:
       name: mobx
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.1+4"
+    version: "2.1.0"
   mobx_codegen:
     dependency: "direct dev"
     description:
       name: mobx_codegen
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.2"
+    version: "2.0.7+3"
   package_config:
     dependency: transitive
     description:
       name: package_config
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.3"
+    version: "2.1.0"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0"
+    version: "1.8.2"
   path_provider:
     dependency: "direct main"
     description:
       name: path_provider
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.28"
+    version: "2.0.11"
+  path_provider_android:
+    dependency: transitive
+    description:
+      name: path_provider_android
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.20"
+  path_provider_ios:
+    dependency: transitive
+    description:
+      name: path_provider_ios
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.11"
   path_provider_linux:
     dependency: transitive
     description:
       name: path_provider_linux
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.1+2"
+    version: "2.1.7"
   path_provider_macos:
     dependency: transitive
     description:
       name: path_provider_macos
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.4+8"
+    version: "2.0.6"
   path_provider_platform_interface:
     dependency: transitive
     description:
       name: path_provider_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.4"
+    version: "2.0.5"
   path_provider_windows:
     dependency: transitive
     description:
       name: path_provider_windows
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.5"
+    version: "2.1.3"
   pedantic:
     dependency: transitive
     description:
@@ -476,14 +483,14 @@ packages:
       name: plugin_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.3"
+    version: "2.1.3"
   pointycastle:
     dependency: transitive
     description:
       name: pointycastle
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.2"
+    version: "3.6.2"
   pool:
     dependency: transitive
     description:
@@ -511,35 +518,28 @@ packages:
       name: pubspec_parse
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.8"
+    version: "1.2.1"
-  quiver:
-    dependency: transitive
-    description:
-      name: quiver
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.5"
   rxdart:
     dependency: "direct main"
     description:
       name: rxdart
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.26.0"
+    version: "0.27.5"
   shelf:
     dependency: transitive
     description:
       name: shelf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.7.9"
+    version: "1.4.0"
   shelf_web_socket:
     dependency: transitive
     description:
       name: shelf_web_socket
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.4+1"
+    version: "1.0.2"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -551,14 +551,21 @@ packages:
       name: source_gen
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.10+3"
+    version: "1.2.5"
+  source_helper:
+    dependency: transitive
+    description:
+      name: source_helper
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.3.3"
   source_span:
     dependency: transitive
     description:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0"
+    version: "1.9.0"
   stack_trace:
     dependency: transitive
     description:
@@ -586,35 +593,28 @@ packages:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.1.1"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.2.1"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.19"
+    version: "0.4.12"
-  time:
-    dependency: transitive
-    description:
-      name: time
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.4.1"
   timing:
     dependency: transitive
     description:
       name: timing
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.1+3"
+    version: "1.0.0"
   typed_data:
     dependency: transitive
     description:
@@ -635,7 +635,7 @@ packages:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0"
+    version: "2.1.2"
   watcher:
     dependency: transitive
     description:
@@ -649,21 +649,21 @@ packages:
       name: web_socket_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "2.2.0"
   win32:
     dependency: transitive
     description:
       name: win32
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.5"
+    version: "3.0.0"
   xdg_directories:
     dependency: transitive
     description:
       name: xdg_directories
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.2"
+    version: "0.2.0+2"
   yaml:
     dependency: transitive
     description:
@@ -672,5 +672,5 @@ packages:
     source: hosted
     version: "3.1.0"
 sdks:
-  dart: ">=2.12.0 <3.0.0"
+  dart: ">=2.17.5 <3.0.0"
-  flutter: ">=1.20.0"
+  flutter: ">=3.0.0"

cw_bitcoin/pubspec.yaml

@@ -6,35 +6,35 @@ author: Cake Wallet
 homepage: https://cakewallet.com
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: ">=2.17.5 <3.0.0"
-  flutter: ">=1.17.0"
+  flutter: ">=1.20.0"
 
 dependencies:
   flutter:
     sdk: flutter
-  path_provider: ^1.4.0
+  path_provider: ^2.0.11
-  http: ^0.12.0+2
+  http: ^0.13.4
-  mobx: ^1.2.1+2
+  mobx: ^2.0.7+4
-  flutter_mobx: ^1.1.0+2
+  flutter_mobx: ^2.0.6+1
   intl: ^0.17.0
   cw_core:
     path: ../cw_core
   bitcoin_flutter:
     git:
       url: https://github.com/cake-tech/bitcoin_flutter.git
-      ref: cake
+      ref: cake-update-v2
-  rxdart: ^0.26.0
+  rxdart: ^0.27.5
   unorm_dart: ^0.2.0
-  cryptography: ^1.4.0
+  cryptography: ^2.0.5
-  encrypt: ^4.0.0
+  encrypt: ^5.0.1
   
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  build_runner: ^1.10.3
+  build_runner: ^2.1.11
-  build_resolvers: ^1.3.10
+  build_resolvers: ^2.0.9
-  mobx_codegen: ^1.1.0+1
+  mobx_codegen: ^2.0.7
-  hive_generator: ^0.8.1
+  hive_generator: ^1.1.3
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec

cw_core/lib/account.dart

@@ -1,7 +1,7 @@
 class Account {
-  Account({this.id, this.label});
+  Account({required this.id, required this.label});
 
-  Account.fromMap(Map map)
+  Account.fromMap(Map<String, Object> map)
       : this.id = map['id'] == null ? 0 : int.parse(map['id'] as String),
         this.label = (map['label'] ?? '') as String;
 

cw_core/lib/account_list.dart

@@ -8,9 +8,9 @@ abstract class AccountList<T> {
 
   List<T> getAll();
 
-  Future addAccount({String label});
+  Future<void> addAccount({required String label});
 
-  Future setLabelAccount({int accountIndex, String label});
+  Future<void> setLabelAccount({required int accountIndex, required String label});
 
   void refresh();
 }

cw_core/lib/crypto_amount_format.dart

@@ -1 +1 @@
-double cryptoAmountToDouble({num amount, num divider}) => amount / divider;
+double cryptoAmountToDouble({required num amount, required num divider}) => amount / divider;

cw_core/lib/crypto_currency.dart

@@ -5,12 +5,17 @@ part 'crypto_currency.g.dart';
 
 @HiveType(typeId: 0)
 class CryptoCurrency extends EnumerableItem<int> with Serializable<int> {
-  const CryptoCurrency({final String title, this.tag, this.name, this.iconPath, final int raw})
+  const CryptoCurrency({
+    String title = '',
+    int raw = -1,
+    this.name,
+    this.iconPath,
+    this.tag,})
       : super(title: title, raw: raw);
 
-  final String tag;
+  final String? tag;
-  final String name;
+  final String? name;
-  final String iconPath;
+  final String? iconPath;
 
   static const all = [
     CryptoCurrency.xmr,
@@ -97,10 +102,7 @@ class CryptoCurrency extends EnumerableItem<int> with Serializable<int> {
   static const zen = CryptoCurrency(title: 'ZEN', iconPath: 'assets/images/zen_icon.png', raw: 44);
   static const xvg = CryptoCurrency(title: 'XVG', name: 'Verge', iconPath: 'assets/images/xvg_icon.png', raw: 45);
 
-
+  static CryptoCurrency deserialize({required int raw}) {
-
-
-  static CryptoCurrency deserialize({int raw}) {
     switch (raw) {
       case 0:
         return CryptoCurrency.xmr;
@@ -195,7 +197,7 @@ class CryptoCurrency extends EnumerableItem<int> with Serializable<int> {
       case 45:
         return CryptoCurrency.xvg;
       default:
-        return null;
+        throw Exception('Unexpected token: $raw for CryptoCurrency deserialize');
     }
   }
 
@@ -294,7 +296,7 @@ class CryptoCurrency extends EnumerableItem<int> with Serializable<int> {
       case 'xvg':
         return CryptoCurrency.xvg;
       default:
-        return null;
+        throw Exception('Unexpected token: $raw for CryptoCurrency fromString');
     }
   }
 

cw_core/lib/currency_for_wallet_type.dart

@@ -12,6 +12,6 @@ CryptoCurrency currencyForWalletType(WalletType type) {
     case WalletType.haven:
       return CryptoCurrency.xhv;
     default:
-      return null;
+      throw Exception('Unexpected wallet type: ${type.toString()} for CryptoCurrency currencyForWalletType');
   }
 }

cw_core/lib/enumerable_item.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/foundation.dart';
 
 abstract class EnumerableItem<T> {
-  const EnumerableItem({@required this.title, @required this.raw});
+  const EnumerableItem({required this.title, required this.raw});
 
   final T raw;
   final String title;
@@ -11,6 +11,6 @@ abstract class EnumerableItem<T> {
 }
 
 mixin Serializable<T> on EnumerableItem<T> {
-  static Serializable deserialize<T>({T raw}) => null;
+  static Serializable deserialize<T>({required T raw}) => throw Exception('Unimplemented');
   T serialize() => raw;
 }

cw_core/lib/get_height_by_date.dart

@@ -85,7 +85,7 @@ final dates = {
   "2020-11": 2220000
 };
 
-int getMoneroHeigthByDate({DateTime date}) {
+int getMoneroHeigthByDate({required DateTime date}) {
   final raw = '${date.year}' + '-' + '${date.month}';
   final lastHeight = dates.values.last;
   int startHeight;
@@ -105,7 +105,7 @@ int getMoneroHeigthByDate({DateTime date}) {
       final daysHeight = (differenceInDays * heightPerDay).round();
       height = endHeight + daysHeight;
     } else {
-      startHeight = dates[raw];
+      startHeight = dates[raw]!;
       final index = dates.values.toList().indexOf(startHeight);
       endHeight = dates.values.toList()[index + 1];
       final heightPerDay = ((endHeight - startHeight) / 31).round();

cw_core/lib/key.dart

@@ -16,14 +16,14 @@ List<String> extractKeys(String key) {
   return [_key, iv];
 }
 
-Future<String> encode({encrypt.Key key, encrypt.IV iv, String data}) async {
+Future<String> encode({required encrypt.Key key, required encrypt.IV iv, required String data}) async {
   final encrypter = encrypt.Encrypter(encrypt.Salsa20(key));
   final encrypted = encrypter.encrypt(data, iv: iv);
 
   return encrypted.base64;
 }
 
-Future<String> decode({String password, String data}) async {
+Future<String> decode({required String password, required String data}) async {
   final keys = extractKeys(password);
   final key = encrypt.Key.fromBase64(keys.first);
   final iv = encrypt.IV.fromBase64(keys.last);

cw_core/lib/monero_amount_format.dart

@@ -7,12 +7,12 @@ final moneroAmountFormat = NumberFormat()
   ..maximumFractionDigits = moneroAmountLength
   ..minimumFractionDigits = 1;
 
-String moneroAmountToString({int amount}) => moneroAmountFormat
+String moneroAmountToString({required int amount}) => moneroAmountFormat
     .format(cryptoAmountToDouble(amount: amount, divider: moneroAmountDivider))
     .replaceAll(',', '');
 
-double moneroAmountToDouble({int amount}) =>
+double moneroAmountToDouble({required int amount}) =>
     cryptoAmountToDouble(amount: amount, divider: moneroAmountDivider);
 
-int moneroParseAmount({String amount}) =>
+int moneroParseAmount({required String amount}) =>
     (double.parse(amount) * moneroAmountDivider).toInt();

cw_core/lib/monero_balance.dart

@@ -1,17 +1,16 @@
 import 'package:cw_core/balance.dart';
-import 'package:flutter/foundation.dart';
 import 'package:cw_core/monero_amount_format.dart';
 
 class MoneroBalance extends Balance {
-  MoneroBalance({@required this.fullBalance, @required this.unlockedBalance})
+  MoneroBalance({required this.fullBalance, required this.unlockedBalance})
       : formattedFullBalance = moneroAmountToString(amount: fullBalance),
         formattedUnlockedBalance =
             moneroAmountToString(amount: unlockedBalance),
         super(unlockedBalance, fullBalance);
 
   MoneroBalance.fromString(
-      {@required this.formattedFullBalance,
+      {required this.formattedFullBalance,
-      @required this.formattedUnlockedBalance})
+      required this.formattedUnlockedBalance})
       : fullBalance = moneroParseAmount(amount: formattedFullBalance),
         unlockedBalance = moneroParseAmount(amount: formattedUnlockedBalance),
         super(moneroParseAmount(amount: formattedUnlockedBalance),

cw_core/lib/monero_transaction_priority.dart

@@ -4,7 +4,7 @@ import 'package:cw_core/wallet_type.dart';
 import 'package:cw_core/enumerable_item.dart';
 
 class MoneroTransactionPriority extends TransactionPriority {
-  const MoneroTransactionPriority({String title, int raw})
+  const MoneroTransactionPriority({required String title, required int raw})
       : super(title: title, raw: raw);
 
   static const all = [
@@ -37,7 +37,7 @@ class MoneroTransactionPriority extends TransactionPriority {
     }
   }
 
-  static MoneroTransactionPriority deserialize({int raw}) {
+  static MoneroTransactionPriority deserialize({required int raw}) {
     switch (raw) {
       case 0:
         return slow;
@@ -50,7 +50,7 @@ class MoneroTransactionPriority extends TransactionPriority {
       case 4:
         return fastest;
       default:
-        return null;
+        throw Exception('Unexpected token: $raw for MoneroTransactionPriority deserialize');
     }
   }
 

cw_core/lib/monero_wallet_keys.dart

@@ -1,9 +1,9 @@
 class MoneroWalletKeys {
   const MoneroWalletKeys(
-      {this.privateSpendKey,
+      {required this.privateSpendKey,
-        this.privateViewKey,
+        required this.privateViewKey,
-        this.publicSpendKey,
+        required this.publicSpendKey,
-        this.publicViewKey});
+        required this.publicViewKey});
 
   final String publicViewKey;
   final String privateViewKey;

cw_core/lib/node.dart

@@ -1,7 +1,5 @@
 import 'dart:io';
-
 import 'package:cw_core/keyable.dart';
-import 'package:flutter/foundation.dart';
 import 'dart:convert';
 import 'package:http/http.dart' as http;
 import 'package:hive/hive.dart';
@@ -11,46 +9,49 @@ import 'package:http/io_client.dart' as ioc;
 part 'node.g.dart';
 
 Uri createUriFromElectrumAddress(String address) =>
-    Uri.tryParse('tcp://$address');
+    Uri.tryParse('tcp://$address')!;
 
 @HiveType(typeId: Node.typeId)
 class Node extends HiveObject with Keyable {
   Node(
-      {@required String uri,
+      {this.login,
-      @required WalletType type,
-      this.login,
       this.password,
       this.useSSL,
-      this.trusted}) {
+      this.trusted = false,
-    uriRaw = uri;
+      String? uri,
-    this.type = type;
+      WalletType? type,}) {
+    if (uri != null) {
+      uriRaw = uri;
+    }
+    if (type != null) {
+      this.type = type;
+    }
   }
 
-  Node.fromMap(Map map)
+  Node.fromMap(Map<String, Object?> map)
-      : uriRaw = map['uri'] as String ?? '',
+      : uriRaw = map['uri'] as String? ?? '',
-        login = map['login'] as String,
+        login = map['login'] as String?,
-        password = map['password'] as String,
+        password = map['password'] as String?,
-        typeRaw = map['typeRaw'] as int,
+        useSSL = map['useSSL'] as bool?,
-        useSSL = map['useSSL'] as bool,
+        trusted = map['trusted'] as bool? ?? false;
-        trusted = map['trusted'] as bool ?? false;
 
   static const typeId = 1;
   static const boxName = 'Nodes';
 
   @HiveField(0)
-  String uriRaw;
+  late String uriRaw;
 
   @HiveField(1)
-  String login;
+  String? login;
 
   @HiveField(2)
-  String password;
+  String? password;
 
   @HiveField(3)
-  int typeRaw;
+  late int typeRaw;
 
   @HiveField(4)
-  bool useSSL;
+  bool? useSSL;
 
   @HiveField(5)
   bool trusted;
@@ -68,7 +69,7 @@ class Node extends HiveObject with Keyable {
       case WalletType.haven:
         return Uri.http(uriRaw, '');
       default:
-        return null;
+        throw Exception('Unexpected type ${type.toString()} for Node uri');
     }
   }
 
@@ -104,33 +105,32 @@ class Node extends HiveObject with Keyable {
   }
 
   Future<bool> requestMoneroNode() async {
-  
     final path = '/json_rpc';
     final rpcUri = isSSL ? Uri.https(uri.authority, path) : Uri.http(uri.authority, path);
     final realm = 'monero-rpc';
     final body = {
-        'jsonrpc': '2.0', 
+        'jsonrpc': '2.0',
-        'id': '0', 
+        'id': '0',
         'method': 'get_info'
     };
 
     try {
       final authenticatingClient = HttpClient();
-    
+
       authenticatingClient.addCredentials(
           rpcUri,
-          realm, 
+          realm,
           HttpClientDigestCredentials(login ?? '', password ?? ''),
       );
-    
+
       final http.Client client = ioc.IOClient(authenticatingClient);
-    
+
       final response = await client.post(
           rpcUri,
           headers: {'Content-Type': 'application/json'},
           body: json.encode(body),
       );
-    
+
       client.close();
 
       final resBody = json.decode(response.body) as Map<String, dynamic>;

cw_core/lib/output_info.dart

@@ -1,20 +1,20 @@
 class OutputInfo {
 	const OutputInfo(
-		{this.fiatAmount,
+		{required this.address,
-		this.cryptoAmount,
+		required this.sendAll,
-		this.address,
+		required this.isParsedAddress,
-		this.note,
+    this.cryptoAmount,
-		this.sendAll,
+		this.formattedCryptoAmount,
-		this.extractedAddress,
+    this.fiatAmount,
-		this.isParsedAddress,
+    this.note,
-		this.formattedCryptoAmount});
+    this.extractedAddress,});
 
-  	final String fiatAmount;
+  	final String? fiatAmount;
-  	final String cryptoAmount;
+  	final String? cryptoAmount;
   	final String address;
-  	final String note;
+  	final String? note;
-  	final String extractedAddress;
+  	final String? extractedAddress;
   	final bool sendAll;
   	final bool isParsedAddress;
-  	final int formattedCryptoAmount;
+  	final int? formattedCryptoAmount;
 }

cw_core/lib/pathForWallet.dart

@@ -3,7 +3,7 @@ import 'package:cw_core/wallet_type.dart';
 import 'package:flutter/foundation.dart';
 import 'package:path_provider/path_provider.dart';
 
-Future<String> pathForWalletDir({@required String name, @required  WalletType type}) async {
+Future<String> pathForWalletDir({required String name, required  WalletType type}) async {
   final root = await getApplicationDocumentsDirectory();
   final prefix = walletTypeToString(type).toLowerCase();
   final walletsDir = Directory('${root.path}/wallets');
@@ -16,11 +16,11 @@ Future<String> pathForWalletDir({@required String name, @required  WalletType ty
   return walletDire.path;
 }
 
-Future<String> pathForWallet({@required String name, @required WalletType type}) async =>
+Future<String> pathForWallet({required String name, required WalletType type}) async =>
     await pathForWalletDir(name: name, type: type)
         .then((path) => path + '/$name');
 
-Future<String> outdatedAndroidPathForWalletDir({String name}) async {
+Future<String> outdatedAndroidPathForWalletDir({required String name}) async {
   final directory = await getApplicationDocumentsDirectory();
   final pathDir = directory.path + '/$name';
 

cw_core/lib/sec_random_native.dart

@@ -6,7 +6,7 @@ const utils = const MethodChannel('com.cake_wallet/native_utils');
 
 Future<Uint8List> secRandom(int count) async {
   try {
-    return await utils.invokeMethod<Uint8List>('sec_random', {'count': count});
+    return await utils.invokeMethod<Uint8List>('sec_random', {'count': count}) ?? Uint8List.fromList([]);
   } on PlatformException catch (_) {
     return Uint8List.fromList([]);
   }

cw_core/lib/subaddress.dart

@@ -1,7 +1,7 @@
 class Subaddress {
-  Subaddress({this.id, this.address, this.label});
+  Subaddress({required this.id, required this.address, required this.label});
 
-  Subaddress.fromMap(Map map)
+  Subaddress.fromMap(Map<String, Object?> map)
       : this.id = map['id'] == null ? 0 : int.parse(map['id'] as String),
         this.address = (map['address'] ?? '') as String,
         this.label = (map['label'] ?? '') as String;

cw_core/lib/transaction_direction.dart

@@ -2,16 +2,22 @@ enum TransactionDirection { incoming, outgoing }
 
 TransactionDirection parseTransactionDirectionFromInt(int raw) {
   switch (raw) {
-    case 0: return TransactionDirection.incoming;
+    case 0:
-    case 1: return TransactionDirection.outgoing;
+      return TransactionDirection.incoming;
-    default: return null;
+    case 1:
+      return TransactionDirection.outgoing;
+    default:
+      throw Exception('Unexpected token: raw for TransactionDirection parseTransactionDirectionFromInt');
   }
 }
 
 TransactionDirection parseTransactionDirectionFromNumber(String raw) {
   switch (raw) {
-    case "0": return TransactionDirection.incoming;
+    case "0":
-    case "1": return TransactionDirection.outgoing;
+      return TransactionDirection.incoming;
-    default: return null;
+    case "1":
+      return TransactionDirection.outgoing;
+    default:
+      throw Exception('Unexpected token: raw for TransactionDirection parseTransactionDirectionFromNumber');
   }
 }

cw_core/lib/transaction_history.dart

@@ -1,10 +1,9 @@
-import 'package:flutter/foundation.dart';
 import 'package:mobx/mobx.dart';
 import 'package:cw_core/transaction_info.dart';
 
 abstract class TransactionHistoryBase<TransactionType extends TransactionInfo> {
-  TransactionHistoryBase();
+  TransactionHistoryBase()
-  // : _isUpdating = false;
+    : transactions = ObservableMap<String, TransactionType>();
 
   @observable
   ObservableMap<String, TransactionType> transactions;

cw_core/lib/transaction_info.dart

@@ -2,21 +2,21 @@ import 'package:cw_core/transaction_direction.dart';
 import 'package:cw_core/keyable.dart';
 
 abstract class TransactionInfo extends Object with Keyable {
-  String id;
+  late String id;
-  int amount;
+  late int amount;
-  int fee;
+  int? fee;
-  TransactionDirection direction;
+  late TransactionDirection direction;
-  bool isPending;
+  late bool isPending;
-  DateTime date;
+  late DateTime date;
-  int height;
+  late int height;
-  int confirmations;
+  late int confirmations;
   String amountFormatted();
   String fiatAmount();
-  String feeFormatted();
+  String? feeFormatted();
   void changeFiatAmount(String amount);
 
   @override
   dynamic get keyIndex => id;
 
-  Map<String, dynamic> additionalInfo;
+  late Map<String, dynamic> additionalInfo;
 }

cw_core/lib/transaction_priority.dart

@@ -2,5 +2,5 @@ import 'package:cw_core/enumerable_item.dart';
 
 abstract class TransactionPriority extends EnumerableItem<int>
     with Serializable<int> {
-  const TransactionPriority({String title, int raw}) : super(title: title, raw: raw);
+  const TransactionPriority({required String title, required int raw}) : super(title: title, raw: raw);
 }

cw_core/lib/unspent_coins_info.dart

@@ -5,11 +5,11 @@ part 'unspent_coins_info.g.dart';
 @HiveType(typeId: UnspentCoinsInfo.typeId)
 class UnspentCoinsInfo extends HiveObject {
   UnspentCoinsInfo({
-    this.walletId,
+    required this.walletId,
-    this.hash,
+    required this.hash,
-    this.isFrozen,
+    required this.isFrozen,
-    this.isSending,
+    required this.isSending,
-    this.note});
+    required this.note});
 
   static const typeId = 9;
   static const boxName = 'Unspent';

cw_core/lib/wallet_addresses.dart

@@ -1,9 +1,8 @@
 import 'package:cw_core/wallet_info.dart';
 
 abstract class WalletAddresses {
-  WalletAddresses(this.walletInfo) {
+  WalletAddresses(this.walletInfo)
-    addressesMap = {};
+    : addressesMap = {};
-  }
 
   final WalletInfo walletInfo;
 
@@ -19,10 +18,6 @@ abstract class WalletAddresses {
 
   Future<void> saveAddressesInBox() async {
     try {
-      if (walletInfo == null) {
-        return;
-      }
-
       walletInfo.address = address;
       walletInfo.addresses = addressesMap;
 

cw_core/lib/wallet_addresses_with_account.dart

@@ -5,9 +5,9 @@ import 'package:cw_core/wallet_info.dart';
 abstract class WalletAddressesWithAccount<T> extends WalletAddresses {
   WalletAddressesWithAccount(WalletInfo walletInfo) : super(walletInfo);
 
-  T get account;
+  // T get account;
 
-  set account(T account);
+  // set account(T account);
 
   AccountList<T> get accountList;
 }

cw_core/lib/wallet_base.dart

@@ -1,12 +1,12 @@
 import 'package:mobx/mobx.dart';
 import 'package:cw_core/balance.dart';
 import 'package:cw_core/transaction_info.dart';
+import 'package:cw_core/transaction_history.dart';
 import 'package:cw_core/transaction_priority.dart';
 import 'package:cw_core/wallet_addresses.dart';
 import 'package:flutter/foundation.dart';
 import 'package:cw_core/wallet_info.dart';
 import 'package:cw_core/pending_transaction.dart';
-import 'package:cw_core/transaction_history.dart';
 import 'package:cw_core/currency_for_wallet_type.dart';
 import 'package:cw_core/crypto_currency.dart';
 import 'package:cw_core/sync_status.dart';
@@ -48,15 +48,15 @@ abstract class WalletBase<
 
   WalletAddresses get walletAddresses;
 
-  HistoryType transactionHistory;
+  late HistoryType transactionHistory;
 
-  Future<void> connectToNode({@required Node node});
+  Future<void> connectToNode({required Node node});
 
   Future<void> startSync();
 
   Future<PendingTransaction> createTransaction(Object credentials);
 
-  int calculateEstimatedFee(TransactionPriority priority, int amount);
+  int calculateEstimatedFee(TransactionPriority priority, int? amount);
 
   // void fetchTransactionsAsync(
   //     void Function(TransactionType transaction) onTransactionLoaded,
@@ -66,7 +66,7 @@ abstract class WalletBase<
 
   Future<void> save();
 
-  Future<void> rescan({int height});
+  Future<void> rescan({required int height});
 
   void close();
 

cw_core/lib/wallet_credentials.dart

@@ -1,10 +1,14 @@
 import 'package:cw_core/wallet_info.dart';
 
 abstract class WalletCredentials {
-  WalletCredentials({this.name, this.password, this.height, this.walletInfo});
+  WalletCredentials({
+    required this.name,
+    this.height,
+    this.walletInfo,
+    this.password});
 
   final String name;
-  final int height;
+  final int? height;
-  String password;
+  String? password;
-  WalletInfo walletInfo;
+  WalletInfo? walletInfo;
 }

cw_core/lib/wallet_info.dart

@@ -13,20 +13,20 @@ class WalletInfo extends HiveObject {
       : _yatLastUsedAddressController = StreamController<String>.broadcast();
 
   factory WalletInfo.external(
-      {@required String id,
+      {required String id,
-      @required String name,
+      required String name,
-      @required WalletType type,
+      required WalletType type,
-      @required bool isRecovery,
+      required bool isRecovery,
-      @required int restoreHeight,
+      required int restoreHeight,
-      @required DateTime date,
+      required DateTime date,
-      @required String dirPath,
+      required String dirPath,
-      @required String path,
+      required String path,
-      @required String address,
+      required String address,
+      bool? showIntroCakePayCard,
       String yatEid ='',
-      String yatLastUsedAddressRaw = '',
+      String yatLastUsedAddressRaw = ''}) {
-      bool showIntroCakePayCard}) {
     return WalletInfo(id, name, type, isRecovery, restoreHeight,
-        date.millisecondsSinceEpoch ?? 0, dirPath, path, address,
+        date.millisecondsSinceEpoch, dirPath, path, address,
         yatEid, yatLastUsedAddressRaw, showIntroCakePayCard);
   }
 
@@ -61,7 +61,7 @@ class WalletInfo extends HiveObject {
   String address;
 
   @HiveField(10)
-  Map<String, String> addresses;
+  Map<String, String>? addresses;
 
   @HiveField(11)
   String yatEid;
@@ -70,7 +70,7 @@ class WalletInfo extends HiveObject {
   String yatLastUsedAddressRaw;
 
   @HiveField(13)
-  bool showIntroCakePayCard;
+  bool? showIntroCakePayCard;
 
   String get yatLastUsedAddress => yatLastUsedAddressRaw;
 
@@ -85,7 +85,7 @@ class WalletInfo extends HiveObject {
     if(showIntroCakePayCard == null) {
       return type != WalletType.haven;
     }
-    return showIntroCakePayCard;
+    return showIntroCakePayCard!;
   }
 
   DateTime get date => DateTime.fromMillisecondsSinceEpoch(timestamp);

cw_core/lib/wallet_type.dart

@@ -55,7 +55,7 @@ WalletType deserializeFromInt(int raw) {
     case 3:
       return WalletType.haven;
     default:
-      return null;
+      throw Exception('Unexpected token: $raw for WalletType deserializeFromInt');
   }
 }
 
@@ -100,6 +100,6 @@ CryptoCurrency walletTypeToCryptoCurrency(WalletType type) {
     case WalletType.haven:
       return CryptoCurrency.xhv;
     default:
-      return null;
+      throw Exception('Unexpected wallet type: ${type.toString()} for CryptoCurrency walletTypeToCryptoCurrency');
   }
 }

cw_core/pubspec.lock

@@ -7,35 +7,35 @@ packages:
       name: _fe_analyzer_shared
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "14.0.0"
+    version: "47.0.0"
   analyzer:
     dependency: transitive
     description:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.41.2"
+    version: "4.7.0"
   args:
     dependency: transitive
     description:
       name: args
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.0"
+    version: "2.3.1"
   asn1lib:
     dependency: transitive
     description:
       name: asn1lib
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.8.1"
+    version: "1.1.1"
   async:
     dependency: transitive
     description:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.5.0"
+    version: "2.9.0"
   boolean_selector:
     dependency: transitive
     description:
@@ -49,42 +49,42 @@ packages:
       name: build
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.2"
+    version: "2.3.1"
   build_config:
     dependency: transitive
     description:
       name: build_config
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.6"
+    version: "1.1.0"
   build_daemon:
     dependency: transitive
     description:
       name: build_daemon
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.10"
+    version: "3.1.0"
   build_resolvers:
     dependency: "direct dev"
     description:
       name: build_resolvers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.5.3"
+    version: "2.0.10"
   build_runner:
     dependency: "direct dev"
     description:
       name: build_runner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.11.5"
+    version: "2.2.1"
   build_runner_core:
     dependency: transitive
     description:
       name: build_runner_core
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.1.10"
+    version: "7.2.4"
   built_collection:
     dependency: transitive
     description:
@@ -105,98 +105,77 @@ packages:
       name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.1"
-  charcode:
-    dependency: transitive
-    description:
-      name: charcode
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.2.0"
   checked_yaml:
     dependency: transitive
     description:
       name: checked_yaml
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.4"
+    version: "2.0.1"
-  cli_util:
-    dependency: transitive
-    description:
-      name: cli_util
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.3.5"
   clock:
     dependency: transitive
     description:
       name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.1.1"
   code_builder:
     dependency: transitive
     description:
       name: code_builder
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.7.0"
+    version: "4.3.0"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.15.0"
+    version: "1.16.0"
   convert:
     dependency: transitive
     description:
       name: convert
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.1"
+    version: "3.0.2"
   crypto:
     dependency: transitive
     description:
       name: crypto
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.5"
+    version: "3.0.2"
   dart_style:
     dependency: transitive
     description:
       name: dart_style
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.12"
+    version: "2.2.4"
-  dartx:
-    dependency: transitive
-    description:
-      name: dartx
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.5.0"
   encrypt:
     dependency: "direct main"
     description:
       name: encrypt
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.1.0"
+    version: "5.0.1"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.1"
   ffi:
     dependency: transitive
     description:
       name: ffi
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.2"
+    version: "2.0.1"
   file:
     dependency: transitive
     description:
@@ -222,12 +201,19 @@ packages:
       name: flutter_mobx
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0+2"
+    version: "2.0.6+4"
   flutter_test:
     dependency: "direct dev"
     description: flutter
     source: sdk
     version: "0.0.0"
+  frontend_server_client:
+    dependency: transitive
+    description:
+      name: frontend_server_client
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.3"
   glob:
     dependency: transitive
     description:
@@ -241,42 +227,42 @@ packages:
       name: graphs
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.0"
+    version: "2.1.0"
   hive:
     dependency: transitive
     description:
       name: hive
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.4.4+1"
+    version: "2.2.3"
   hive_generator:
     dependency: "direct dev"
     description:
       name: hive_generator
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.8.2"
+    version: "1.1.3"
   http:
     dependency: "direct main"
     description:
       name: http
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.2"
+    version: "0.13.5"
   http_multi_server:
     dependency: transitive
     description:
       name: http_multi_server
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "3.2.1"
   http_parser:
     dependency: transitive
     description:
       name: http_parser
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.1.4"
+    version: "4.0.1"
   intl:
     dependency: "direct main"
     description:
@@ -290,7 +276,7 @@ packages:
       name: io
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.5"
+    version: "1.0.3"
   js:
     dependency: transitive
     description:
@@ -304,7 +290,7 @@ packages:
       name: json_annotation
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.0.1"
+    version: "4.6.0"
   logging:
     dependency: transitive
     description:
@@ -318,14 +304,21 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.10"
+    version: "0.12.12"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.5"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0"
+    version: "1.8.0"
   mime:
     dependency: transitive
     description:
@@ -339,63 +332,77 @@ packages:
       name: mobx
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.1+4"
+    version: "2.1.0"
   mobx_codegen:
     dependency: "direct dev"
     description:
       name: mobx_codegen
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.2"
+    version: "2.0.7+3"
   package_config:
     dependency: transitive
     description:
       name: package_config
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.3"
+    version: "2.1.0"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0"
+    version: "1.8.2"
   path_provider:
     dependency: "direct main"
     description:
       name: path_provider
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.28"
+    version: "2.0.11"
+  path_provider_android:
+    dependency: transitive
+    description:
+      name: path_provider_android
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.20"
+  path_provider_ios:
+    dependency: transitive
+    description:
+      name: path_provider_ios
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.11"
   path_provider_linux:
     dependency: transitive
     description:
       name: path_provider_linux
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.1+2"
+    version: "2.1.7"
   path_provider_macos:
     dependency: transitive
     description:
       name: path_provider_macos
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.4+8"
+    version: "2.0.6"
   path_provider_platform_interface:
     dependency: transitive
     description:
       name: path_provider_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.4"
+    version: "2.0.4"
   path_provider_windows:
     dependency: transitive
     description:
       name: path_provider_windows
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.5"
+    version: "2.1.3"
   pedantic:
     dependency: transitive
     description:
@@ -416,14 +423,14 @@ packages:
       name: plugin_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.3"
+    version: "2.1.3"
   pointycastle:
     dependency: transitive
     description:
       name: pointycastle
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.1"
+    version: "3.6.2"
   pool:
     dependency: transitive
     description:
@@ -451,21 +458,21 @@ packages:
       name: pubspec_parse
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.8"
+    version: "1.2.1"
   shelf:
     dependency: transitive
     description:
       name: shelf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.7.9"
+    version: "1.3.2"
   shelf_web_socket:
     dependency: transitive
     description:
       name: shelf_web_socket
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.4+1"
+    version: "1.0.2"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -477,14 +484,21 @@ packages:
       name: source_gen
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.10+3"
+    version: "1.2.3"
+  source_helper:
+    dependency: transitive
+    description:
+      name: source_helper
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.3.3"
   source_span:
     dependency: transitive
     description:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0"
+    version: "1.9.0"
   stack_trace:
     dependency: transitive
     description:
@@ -512,35 +526,28 @@ packages:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.1.1"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.2.1"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.19"
+    version: "0.4.12"
-  time:
-    dependency: transitive
-    description:
-      name: time
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.4.1"
   timing:
     dependency: transitive
     description:
       name: timing
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.1+3"
+    version: "1.0.0"
   typed_data:
     dependency: transitive
     description:
@@ -554,7 +561,7 @@ packages:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0"
+    version: "2.1.2"
   watcher:
     dependency: transitive
     description:
@@ -568,21 +575,21 @@ packages:
       name: web_socket_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "2.2.0"
   win32:
     dependency: transitive
     description:
       name: win32
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.5"
+    version: "3.0.0"
   xdg_directories:
     dependency: transitive
     description:
       name: xdg_directories
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.2"
+    version: "0.2.0+2"
   yaml:
     dependency: transitive
     description:
@@ -591,5 +598,5 @@ packages:
     source: hosted
     version: "3.1.0"
 sdks:
-  dart: ">=2.12.0 <3.0.0"
+  dart: ">=2.17.5 <3.0.0"
-  flutter: ">=1.20.0"
+  flutter: ">=3.0.0"

cw_core/pubspec.yaml

@@ -6,26 +6,26 @@ author: Cake Wallet
 homepage: https://cakewallet.com
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: ">=2.17.5 <3.0.0"
-  flutter: ">=1.17.0"
+  flutter: ">=1.20.0"
 
 dependencies:
   flutter:
     sdk: flutter
-  http: ^0.12.0+2
+  http: ^0.13.4
-  path_provider: ^1.3.0
+  path_provider: ^2.0.11
-  mobx: ^1.2.1+2
+  mobx: ^2.0.7+4
-  flutter_mobx: ^1.1.0+2
+  flutter_mobx: ^2.0.6+1
   intl: ^0.17.0
-  encrypt: ^4.0.0
+  encrypt: ^5.0.1
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  build_runner: ^1.10.3
+  build_runner: ^2.1.11
-  build_resolvers: ^1.3.10
+  build_resolvers: ^2.0.9
-  mobx_codegen: ^1.1.0+1
+  mobx_codegen: ^2.0.7
-  hive_generator: ^0.8.1
+  hive_generator: ^1.1.3
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec

cw_haven/lib/api/account_list.dart

@@ -50,16 +50,16 @@ List<AccountRow> getAllAccount() {
       .toList();
 }
 
-void addAccountSync({String label}) {
+void addAccountSync({required String label}) {
-  final labelPointer = Utf8.toUtf8(label);
+  final labelPointer = label.toNativeUtf8();
   accountAddNewNative(labelPointer);
-  free(labelPointer);
+  calloc.free(labelPointer);
 }
 
-void setLabelForAccountSync({int accountIndex, String label}) {
+void setLabelForAccountSync({required int accountIndex, required String label}) {
-  final labelPointer = Utf8.toUtf8(label);
+  final labelPointer = label.toNativeUtf8();
   accountSetLabelNative(accountIndex, labelPointer);
-  free(labelPointer);
+  calloc.free(labelPointer);
 }
 
 void _addAccount(String label) => addAccountSync(label: label);
@@ -71,12 +71,12 @@ void _setLabelForAccount(Map<String, dynamic> args) {
   setLabelForAccountSync(label: label, accountIndex: accountIndex);
 }
 
-Future<void> addAccount({String label}) async {
+Future<void> addAccount({required String label}) async {
   await compute(_addAccount, label);
   await store();
 }
 
-Future<void> setLabelForAccount({int accountIndex, String label}) async {
+Future<void> setLabelForAccount({required int accountIndex, required String label}) async {
     await compute(
         _setLabelForAccount, {'accountIndex': accountIndex, 'label': label});
     await store();

cw_haven/lib/api/convert_utf8_to_string.dart

@@ -1,8 +1,8 @@
 import 'dart:ffi';
 import 'package:ffi/ffi.dart';
 
-String convertUTF8ToString({Pointer<Utf8> pointer}) {
+String convertUTF8ToString({required Pointer<Utf8> pointer}) {
-  final str = Utf8.fromUtf8(pointer);
+  final str = pointer.toDartString();
-  free(pointer);
+  calloc.free(pointer);
   return str;
 }

cw_haven/lib/api/cw_haven.dart

@@ -8,7 +8,7 @@ class CwHaven {
       const MethodChannel('cw_haven');
 
   static Future<String> get platformVersion async {
-    final String version = await _channel.invokeMethod('getPlatformVersion');
+    final String version = await _channel.invokeMethod<String>('getPlatformVersion') ?? '';
     return version;
   }
 }

cw_haven/lib/api/exceptions/connection_to_node_exception.dart

@@ -1,5 +1,5 @@
 class ConnectionToNodeException implements Exception {
-  ConnectionToNodeException({this.message});
+  ConnectionToNodeException({required this.message});
 
   final String message;
 }

cw_haven/lib/api/exceptions/creation_transaction_exception.dart

@@ -1,5 +1,5 @@
 class CreationTransactionException implements Exception {
-  CreationTransactionException({this.message});
+  CreationTransactionException({required this.message});
   
   final String message;
 

cw_haven/lib/api/exceptions/setup_wallet_exception.dart

@@ -1,5 +1,5 @@
 class SetupWalletException implements Exception {
-  SetupWalletException({this.message});
+  SetupWalletException({required this.message});
   
   final String message;
 }

cw_haven/lib/api/exceptions/wallet_creation_exception.dart

@@ -1,5 +1,5 @@
 class WalletCreationException implements Exception {
-  WalletCreationException({this.message});
+  WalletCreationException({required this.message});
 
   final String message;
 

cw_haven/lib/api/exceptions/wallet_opening_exception.dart

@@ -1,5 +1,5 @@
 class WalletOpeningException implements Exception {
-  WalletOpeningException({this.message});
+  WalletOpeningException({required this.message});
 
   final String message;
 

cw_haven/lib/api/exceptions/wallet_restore_from_keys_exception.dart

@@ -1,5 +1,5 @@
 class WalletRestoreFromKeysException implements Exception {
-  WalletRestoreFromKeysException({this.message});
+  WalletRestoreFromKeysException({required this.message});
   
   final String message;
 }

cw_haven/lib/api/exceptions/wallet_restore_from_seed_exception.dart

@@ -1,5 +1,5 @@
 class WalletRestoreFromSeedException implements Exception {
-  WalletRestoreFromSeedException({this.message});
+  WalletRestoreFromSeedException({required this.message});
   
   final String message;
 }

cw_haven/lib/api/monero_output.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/foundation.dart';
 
 class MoneroOutput {
-  MoneroOutput({@required this.address, @required this.amount});
+  MoneroOutput({required this.address, required this.amount});
 
   final String address;
   final String amount;

cw_haven/lib/api/signatures.dart

@@ -39,7 +39,7 @@ typedef get_node_height = Int64 Function();
 typedef is_connected = Int8 Function();
 
 typedef setup_node = Int8 Function(
-    Pointer<Utf8>, Pointer<Utf8>, Pointer<Utf8>, Int8, Int8, Pointer<Utf8>);
+    Pointer<Utf8>, Pointer<Utf8>?, Pointer<Utf8>?, Int8, Int8, Pointer<Utf8>);
 
 typedef start_refresh = Void Function();
 
@@ -86,7 +86,7 @@ typedef account_set_label = Void Function(
 
 typedef transactions_refresh = Void Function();
 
-typedef get_tx_key = Pointer<Utf8> Function(Pointer<Utf8> txId);
+typedef get_tx_key = Pointer<Utf8>? Function(Pointer<Utf8> txId);
 
 typedef transactions_count = Int64 Function();
 

cw_haven/lib/api/structs/account_row.dart

@@ -3,9 +3,10 @@ import 'package:ffi/ffi.dart';
 
 class AccountRow extends Struct {
   @Int64()
-  int id;
+  external int id;
-  Pointer<Utf8> label;
+  
+  external Pointer<Utf8> label;
 
-  String getLabel() => Utf8.fromUtf8(label);
+  String getLabel() => label.toDartString();
   int getId() => id;
 }

cw_haven/lib/api/structs/haven_balance_row.dart

@@ -3,9 +3,10 @@ import 'package:ffi/ffi.dart';
 
 class HavenBalanceRow extends Struct {
   @Int64()
-  int amount;
+  external int amount;
-  Pointer<Utf8> assetType;
+  
+  external Pointer<Utf8> assetType;
 
   int getAmount() => amount;
-  String getAssetType() => Utf8.fromUtf8(assetType);
+  String getAssetType() => assetType.toDartString();
 }

cw_haven/lib/api/structs/haven_rate.dart

@@ -3,9 +3,10 @@ import 'package:ffi/ffi.dart';
 
 class HavenRate extends Struct {
   @Int64()
-  int rate;
+  external int rate;
-  Pointer<Utf8> assetType;
+  
+  external Pointer<Utf8> assetType;
 
   int getRate() => rate;
-  String getAssetType() => Utf8.fromUtf8(assetType);
+  String getAssetType() => assetType.toDartString();
 }

cw_haven/lib/api/structs/pending_transaction.dart

@@ -3,18 +3,22 @@ import 'package:ffi/ffi.dart';
 
 class PendingTransactionRaw extends Struct {
   @Int64()
-  int amount;
+  external int amount;
 
   @Int64()
-  int fee;
+  external int fee;
 
-  Pointer<Utf8> hash;
+  external Pointer<Utf8> hash;
 
-  String getHash() => Utf8.fromUtf8(hash);
+  String getHash() => hash.toDartString();
 }
 
 class PendingTransactionDescription {
-  PendingTransactionDescription({this.amount, this.fee, this.hash, this.pointerAddress});
+  PendingTransactionDescription({
+    required this.amount,
+    required this.fee,
+    required this.hash,
+    required this.pointerAddress});
 
   final int amount;
   final int fee;

cw_haven/lib/api/structs/subaddress_row.dart

@@ -3,11 +3,13 @@ import 'package:ffi/ffi.dart';
 
 class SubaddressRow extends Struct {
   @Int64()
-  int id;
+  external int id;
-  Pointer<Utf8> address;
+  
-  Pointer<Utf8> label;
+  external Pointer<Utf8> address;
+  
+  external Pointer<Utf8> label;
 
-  String getLabel() => Utf8.fromUtf8(label);
+  String getLabel() => label.toDartString();
-  String getAddress() => Utf8.fromUtf8(address);
+  String getAddress() => address.toDartString();
   int getId() => id;
 }

cw_haven/lib/api/structs/transaction_info_row.dart

@@ -3,42 +3,42 @@ import 'package:ffi/ffi.dart';
 
 class TransactionInfoRow extends Struct {
   @Uint64()
-  int amount;
+  external int amount;
 
   @Uint64()
-  int fee;
+  external int fee;
 
   @Uint64()
-  int blockHeight;
+  external int blockHeight;
 
   @Uint64()
-  int confirmations;
+  external int confirmations;
 
   @Uint32()
-  int subaddrAccount;
+  external int subaddrAccount;
 
   @Int8()
-  int direction;
+  external int direction;
 
   @Int8()
-  int isPending;
+  external int isPending;
 
   @Uint32()
-  int subaddrIndex;
+  external int subaddrIndex;
 
-  Pointer<Utf8> hash;
+  external Pointer<Utf8> hash;
 
-  Pointer<Utf8> paymentId;
+  external Pointer<Utf8> paymentId;
 
-  Pointer<Utf8> assetType;
+  external Pointer<Utf8> assetType;
 
   @Int64()
-  int datetime;
+  external int datetime;
 
   int getDatetime() => datetime;
   int getAmount() => amount >= 0 ? amount : amount * -1;
   bool getIsPending() => isPending != 0;
-  String getHash() => Utf8.fromUtf8(hash);
+  String getHash() => hash.toDartString();
-  String getPaymentId() => Utf8.fromUtf8(paymentId);
+  String getPaymentId() => paymentId.toDartString();
-  String getAssetType() => Utf8.fromUtf8(assetType);
+  String getAssetType() => assetType.toDartString();
 }

cw_haven/lib/api/structs/ut8_box.dart

@@ -2,7 +2,7 @@ import 'dart:ffi';
 import 'package:ffi/ffi.dart';
 
 class Utf8Box extends Struct {
-  Pointer<Utf8> value;
+  external Pointer<Utf8> value;
 
-  String getValue() => Utf8.fromUtf8(value);
+  String getValue() => value.toDartString();
 }

cw_haven/lib/api/subaddress_list.dart

@@ -29,7 +29,7 @@ final subaddrressSetLabelNative = havenApi
 
 bool isUpdating = false;
 
-void refreshSubaddresses({@required int accountIndex}) {
+void refreshSubaddresses({required int accountIndex}) {
   try {
     isUpdating = true;
     subaddressRefreshNative(accountIndex);
@@ -50,18 +50,18 @@ List<SubaddressRow> getAllSubaddresses() {
       .toList();
 }
 
-void addSubaddressSync({int accountIndex, String label}) {
+void addSubaddressSync({required int accountIndex, required String label}) {
-  final labelPointer = Utf8.toUtf8(label);
+  final labelPointer = label.toNativeUtf8();
   subaddrressAddNewNative(accountIndex, labelPointer);
-  free(labelPointer);
+  calloc.free(labelPointer);
 }
 
 void setLabelForSubaddressSync(
-    {int accountIndex, int addressIndex, String label}) {
+    {required int accountIndex, required int addressIndex, required String label}) {
-  final labelPointer = Utf8.toUtf8(label);
+  final labelPointer = label.toNativeUtf8();
 
   subaddrressSetLabelNative(accountIndex, addressIndex, labelPointer);
-  free(labelPointer);
+  calloc.free(labelPointer);
 }
 
 void _addSubaddress(Map<String, dynamic> args) {
@@ -80,14 +80,14 @@ void _setLabelForSubaddress(Map<String, dynamic> args) {
       accountIndex: accountIndex, addressIndex: addressIndex, label: label);
 }
 
-Future addSubaddress({int accountIndex, String label}) async {
+Future addSubaddress({required int accountIndex, required String label}) async {
     await compute<Map<String, Object>, void>(
         _addSubaddress, {'accountIndex': accountIndex, 'label': label});
     await store();
 }
 
 Future setLabelForSubaddress(
-        {int accountIndex, int addressIndex, String label}) async {
+        {required int accountIndex, required int addressIndex, required String label}) async {
   await compute<Map<String, Object>, void>(_setLabelForSubaddress, {
     'accountIndex': accountIndex,
     'addressIndex': addressIndex,

cw_haven/lib/api/transaction_history.dart

@@ -40,16 +40,16 @@ final getTxKeyNative = havenApi
     .asFunction<GetTxKey>();
 
 String getTxKey(String txId) {
-  final txIdPointer = Utf8.toUtf8(txId);
+  final txIdPointer = txId.toNativeUtf8();
   final keyPointer = getTxKeyNative(txIdPointer);
 
-  free(txIdPointer);
+  calloc.free(txIdPointer);
 
   if (keyPointer != null) {
     return convertUTF8ToString(pointer: keyPointer);
   }
 
-  return null;
+  return '';
 }
 
 void refreshTransactions() => transactionsRefreshNative();
@@ -67,18 +67,18 @@ List<TransactionInfoRow> getAllTransations() {
 }
 
 PendingTransactionDescription createTransactionSync(
-    {String address,
+    {required String address,
-    String assetType,
+    required String assetType,
-    String paymentId,
+    required String paymentId,
-    String amount,
+    required int priorityRaw,
-    int priorityRaw,
+    String? amount,
     int accountIndex = 0}) {
-  final addressPointer = Utf8.toUtf8(address);
+  final addressPointer = address.toNativeUtf8();
-  final assetTypePointer = Utf8.toUtf8(assetType);
+  final assetTypePointer = assetType.toNativeUtf8();
-  final paymentIdPointer = Utf8.toUtf8(paymentId);
+  final paymentIdPointer = paymentId.toNativeUtf8();
-  final amountPointer = amount != null ? Utf8.toUtf8(amount) : nullptr;
+  final amountPointer = amount != null ? amount.toNativeUtf8() : nullptr;
-  final errorMessagePointer = allocate<Utf8Box>();
+  final errorMessagePointer = calloc<Utf8Box>();
-  final pendingTransactionRawPointer = allocate<PendingTransactionRaw>();
+  final pendingTransactionRawPointer = calloc<PendingTransactionRaw>();
   final created = transactionCreateNative(
           addressPointer,
           assetTypePointer,
@@ -90,17 +90,17 @@ PendingTransactionDescription createTransactionSync(
           pendingTransactionRawPointer) !=
       0;
 
-  free(addressPointer);
+  calloc.free(addressPointer);
-  free(assetTypePointer);
+  calloc.free(assetTypePointer);
-  free(paymentIdPointer);
+  calloc.free(paymentIdPointer);
 
   if (amountPointer != nullptr) {
-    free(amountPointer);
+    calloc.free(amountPointer);
   }
 
   if (!created) {
     final message = errorMessagePointer.ref.getValue();
-    free(errorMessagePointer);
+    calloc.free(errorMessagePointer);
     throw CreationTransactionException(message: message);
   }
 
@@ -112,28 +112,28 @@ PendingTransactionDescription createTransactionSync(
 }
 
 PendingTransactionDescription createTransactionMultDestSync(
-    {List<MoneroOutput> outputs,
+    {required List<MoneroOutput> outputs,
-      String assetType,
+      required String assetType,
-      String paymentId,
+      required String paymentId,
-      int priorityRaw,
+      required int priorityRaw,
       int accountIndex = 0}) {
   final int size = outputs.length;
   final List<Pointer<Utf8>> addressesPointers = outputs.map((output) =>
-      Utf8.toUtf8(output.address)).toList();
+      output.address.toNativeUtf8()).toList();
-  final Pointer<Pointer<Utf8>> addressesPointerPointer = allocate(count: size);
+  final Pointer<Pointer<Utf8>> addressesPointerPointer = calloc(size);
   final List<Pointer<Utf8>> amountsPointers = outputs.map((output) =>
-      Utf8.toUtf8(output.amount)).toList();
+      output.amount.toNativeUtf8()).toList();
-  final Pointer<Pointer<Utf8>> amountsPointerPointer = allocate(count: size);
+  final Pointer<Pointer<Utf8>> amountsPointerPointer = calloc( size);
 
   for (int i = 0; i < size; i++) {
     addressesPointerPointer[i] = addressesPointers[i];
     amountsPointerPointer[i] = amountsPointers[i];
   }
 
-  final assetTypePointer = Utf8.toUtf8(assetType);
+  final assetTypePointer = assetType.toNativeUtf8();
-  final paymentIdPointer = Utf8.toUtf8(paymentId);
+  final paymentIdPointer = paymentId.toNativeUtf8();
-  final errorMessagePointer = allocate<Utf8Box>();
+  final errorMessagePointer = calloc<Utf8Box>();
-  final pendingTransactionRawPointer = allocate<PendingTransactionRaw>();
+  final pendingTransactionRawPointer = calloc<PendingTransactionRaw>();
   final created = transactionCreateMultDestNative(
       addressesPointerPointer,
       assetTypePointer,
@@ -146,18 +146,18 @@ PendingTransactionDescription createTransactionMultDestSync(
       pendingTransactionRawPointer) !=
       0;
 
-  free(addressesPointerPointer);
+  calloc.free(addressesPointerPointer);
-  free(assetTypePointer);
+  calloc.free(assetTypePointer);
-  free(amountsPointerPointer);
+  calloc.free(amountsPointerPointer);
 
-  addressesPointers.forEach((element) => free(element));
+  addressesPointers.forEach((element) => calloc.free(element));
-  amountsPointers.forEach((element) => free(element));
+  amountsPointers.forEach((element) => calloc.free(element));
 
-  free(paymentIdPointer);
+  calloc.free(paymentIdPointer);
 
   if (!created) {
     final message = errorMessagePointer.ref.getValue();
-    free(errorMessagePointer);
+    calloc.free(errorMessagePointer);
     throw CreationTransactionException(message: message);
   }
 
@@ -168,17 +168,17 @@ PendingTransactionDescription createTransactionMultDestSync(
       pointerAddress: pendingTransactionRawPointer.address);
 }
 
-void commitTransactionFromPointerAddress({int address}) => commitTransaction(
+void commitTransactionFromPointerAddress({required int address}) => commitTransaction(
     transactionPointer: Pointer<PendingTransactionRaw>.fromAddress(address));
 
-void commitTransaction({Pointer<PendingTransactionRaw> transactionPointer}) {
+void commitTransaction({required Pointer<PendingTransactionRaw> transactionPointer}) {
-  final errorMessagePointer = allocate<Utf8Box>();
+  final errorMessagePointer = calloc<Utf8Box>();
   final isCommited =
       transactionCommitNative(transactionPointer, errorMessagePointer) != 0;
 
   if (!isCommited) {
     final message = errorMessagePointer.ref.getValue();
-    free(errorMessagePointer);
+    calloc.free(errorMessagePointer);
     throw CreationTransactionException(message: message);
   }
 }
@@ -216,11 +216,11 @@ PendingTransactionDescription _createTransactionMultDestSync(Map args) {
 }
 
 Future<PendingTransactionDescription> createTransaction(
-        {String address,
+        {required String address,
-         String assetType,
+         required String assetType,
+        required int priorityRaw,
+        String? amount,
         String paymentId = '',
-        String amount,
-        int priorityRaw,
         int accountIndex = 0}) =>
     compute(_createTransactionSync, {
       'address': address,
@@ -232,10 +232,10 @@ Future<PendingTransactionDescription> createTransaction(
     });
 
 Future<PendingTransactionDescription> createTransactionMultDest(
-    {List<MoneroOutput> outputs,
+    {required List<MoneroOutput> outputs,
-      String assetType,
+      required int priorityRaw,
+      String? assetType,
       String paymentId = '',
-      int priorityRaw,
       int accountIndex = 0}) =>
     compute(_createTransactionMultDestSync, {
       'outputs': outputs,

cw_haven/lib/api/types.dart

@@ -39,7 +39,7 @@ typedef GetNodeHeight = int Function();
 typedef IsConnected = int Function();
 
 typedef SetupNode = int Function(
-    Pointer<Utf8>, Pointer<Utf8>, Pointer<Utf8>, int, int, Pointer<Utf8>);
+    Pointer<Utf8>, Pointer<Utf8>?, Pointer<Utf8>?, int, int, Pointer<Utf8>);
 
 typedef StartRefresh = void Function();
 
@@ -84,7 +84,7 @@ typedef AccountSetLabel = void Function(int accountIndex, Pointer<Utf8> label);
 
 typedef TransactionsRefresh = void Function();
 
-typedef GetTxKey = Pointer<Utf8> Function(Pointer<Utf8> txId);
+typedef GetTxKey = Pointer<Utf8>? Function(Pointer<Utf8> txId);
 
 typedef TransactionsCount = int Function();
 

cw_haven/lib/api/wallet.dart

@@ -150,24 +150,24 @@ int getNodeHeightSync() => getNodeHeightNative();
 bool isConnectedSync() => isConnectedNative() != 0;
 
 bool setupNodeSync(
-    {String address,
+    {required String address,
-    String login,
+    String? login,
-    String password,
+    String? password,
     bool useSSL = false,
     bool isLightWallet = false}) {
-  final addressPointer = Utf8.toUtf8(address);
+  final addressPointer = address.toNativeUtf8();
-  Pointer<Utf8> loginPointer;
+  Pointer<Utf8>? loginPointer;
-  Pointer<Utf8> passwordPointer;
+  Pointer<Utf8>? passwordPointer;
 
   if (login != null) {
-    loginPointer = Utf8.toUtf8(login);
+    loginPointer = login.toNativeUtf8();
   }
 
   if (password != null) {
-    passwordPointer = Utf8.toUtf8(password);
+    passwordPointer = password.toNativeUtf8();
   }
 
-  final errorMessagePointer = allocate<Utf8>();
+  final errorMessagePointer = ''.toNativeUtf8();
   final isSetupNode = setupNodeNative(
           addressPointer,
           loginPointer,
@@ -177,9 +177,15 @@ bool setupNodeSync(
           errorMessagePointer) !=
       0;
 
-  free(addressPointer);
+  calloc.free(addressPointer);
-  free(loginPointer);
+
-  free(passwordPointer);
+  if (loginPointer != null) {
+    calloc.free(loginPointer);
+  }
+
+  if (passwordPointer != null) {
+    calloc.free(passwordPointer);
+  }
 
   if (!isSetupNode) {
     throw SetupWalletException(
@@ -193,31 +199,31 @@ void startRefreshSync() => startRefreshNative();
 
 Future<bool> connectToNode() async => connecToNodeNative() != 0;
 
-void setRefreshFromBlockHeight({int height}) =>
+void setRefreshFromBlockHeight({required int height}) =>
     setRefreshFromBlockHeightNative(height);
 
-void setRecoveringFromSeed({bool isRecovery}) =>
+void setRecoveringFromSeed({required bool isRecovery}) =>
     setRecoveringFromSeedNative(_boolToInt(isRecovery));
 
 void storeSync() {
-  final pathPointer = Utf8.toUtf8('');
+  final pathPointer = ''.toNativeUtf8();
   storeNative(pathPointer);
-  free(pathPointer);
+  calloc.free(pathPointer);
 }
 
 void setPasswordSync(String password) {
-  final passwordPointer = Utf8.toUtf8(password);
+  final passwordPointer = password.toNativeUtf8();
-  final errorMessagePointer = allocate<Utf8Box>();
+  final errorMessagePointer = calloc<Utf8Box>();
   final changed = setPasswordNative(passwordPointer, errorMessagePointer) != 0;
-  free(passwordPointer);
+  calloc.free(passwordPointer);
   
   if (!changed) {
     final message = errorMessagePointer.ref.getValue();
-    free(errorMessagePointer);
+    calloc.free(errorMessagePointer);
     throw Exception(message);
   }
 
-  free(errorMessagePointer);
+  calloc.free(errorMessagePointer);
 }
 
 void closeCurrentWallet() => closeCurrentWalletNative();
@@ -235,16 +241,15 @@ String getPublicSpendKey() =>
     convertUTF8ToString(pointer: getPublicSpendKeyNative());
 
 class SyncListener {
-  SyncListener(this.onNewBlock, this.onNewTransaction) {
+  SyncListener(this.onNewBlock, this.onNewTransaction)
-    _cachedBlockchainHeight = 0;
+    : _cachedBlockchainHeight = 0,
-    _lastKnownBlockHeight = 0;
+      _lastKnownBlockHeight = 0,
-    _initialSyncHeight = 0;
+      _initialSyncHeight = 0;
-  }
 
   void Function(int, int, double) onNewBlock;
   void Function() onNewTransaction;
 
-  Timer _updateSyncInfoTimer;
+  Timer? _updateSyncInfoTimer;
   int _cachedBlockchainHeight;
   int _lastKnownBlockHeight;
   int _initialSyncHeight;
@@ -333,13 +338,13 @@ int _getNodeHeight(Object _) => getNodeHeightSync();
 
 void startRefresh() => startRefreshSync();
 
-Future setupNode(
+Future<void> setupNode(
-        {String address,
+        {required String address,
-        String login,
+        String? login,
-        String password,
+        String? password,
         bool useSSL = false,
         bool isLightWallet = false}) =>
-    compute<Map<String, Object>, void>(_setupNodeSync, {
+    compute<Map<String, Object?>, void>(_setupNodeSync, {
       'address': address,
       'login': login,
       'password': password,
@@ -347,7 +352,7 @@ Future setupNode(
       'isLightWallet': isLightWallet
     });
 
-Future store() => compute<int, void>(_storeSync, 0);
+Future<void> store() => compute<int, void>(_storeSync, 0);
 
 Future<bool> isConnected() => compute(_isConnected, 0);
 

cw_haven/lib/api/wallet_manager.dart

@@ -38,18 +38,18 @@ final errorStringNative = havenApi
     .asFunction<ErrorString>();
 
 void createWalletSync(
-    {String path, String password, String language, int nettype = 0}) {
+    {required String path, required String password, required String language, int nettype = 0}) {
-  final pathPointer = Utf8.toUtf8(path);
+  final pathPointer = path.toNativeUtf8();
-  final passwordPointer = Utf8.toUtf8(password);
+  final passwordPointer = password.toNativeUtf8();
-  final languagePointer = Utf8.toUtf8(language);
+  final languagePointer = language.toNativeUtf8();
-  final errorMessagePointer = allocate<Utf8>();
+  final errorMessagePointer = ''.toNativeUtf8();
   final isWalletCreated = createWalletNative(pathPointer, passwordPointer,
           languagePointer, nettype, errorMessagePointer) !=
       0;
 
-  free(pathPointer);
+  calloc.free(pathPointer);
-  free(passwordPointer);
+  calloc.free(passwordPointer);
-  free(languagePointer);
+  calloc.free(languagePointer);
 
   if (!isWalletCreated) {
     throw WalletCreationException(
@@ -59,25 +59,25 @@ void createWalletSync(
   // setupNodeSync(address: "node.moneroworld.com:18089");
 }
 
-bool isWalletExistSync({String path}) {
+bool isWalletExistSync({required String path}) {
-  final pathPointer = Utf8.toUtf8(path);
+  final pathPointer = path.toNativeUtf8();
   final isExist = isWalletExistNative(pathPointer) != 0;
 
-  free(pathPointer);
+  calloc.free(pathPointer);
 
   return isExist;
 }
 
 void restoreWalletFromSeedSync(
-    {String path,
+    {required String path,
-    String password,
+    required String password,
-    String seed,
+    required String seed,
     int nettype = 0,
     int restoreHeight = 0}) {
-  final pathPointer = Utf8.toUtf8(path);
+  final pathPointer = path.toNativeUtf8();
-  final passwordPointer = Utf8.toUtf8(password);
+  final passwordPointer = password.toNativeUtf8();
-  final seedPointer = Utf8.toUtf8(seed);
+  final seedPointer = seed.toNativeUtf8();
-  final errorMessagePointer = allocate<Utf8>();
+  final errorMessagePointer = ''.toNativeUtf8();
   final isWalletRestored = restoreWalletFromSeedNative(
           pathPointer,
           passwordPointer,
@@ -87,9 +87,9 @@ void restoreWalletFromSeedSync(
           errorMessagePointer) !=
       0;
 
-  free(pathPointer);
+  calloc.free(pathPointer);
-  free(passwordPointer);
+  calloc.free(passwordPointer);
-  free(seedPointer);
+  calloc.free(seedPointer);
 
   if (!isWalletRestored) {
     throw WalletRestoreFromSeedException(
@@ -98,21 +98,21 @@ void restoreWalletFromSeedSync(
 }
 
 void restoreWalletFromKeysSync(
-    {String path,
+    {required String path,
-    String password,
+    required String password,
-    String language,
+    required String language,
-    String address,
+    required String address,
-    String viewKey,
+    required String viewKey,
-    String spendKey,
+    required String spendKey,
     int nettype = 0,
     int restoreHeight = 0}) {
-  final pathPointer = Utf8.toUtf8(path);
+  final pathPointer = path.toNativeUtf8();
-  final passwordPointer = Utf8.toUtf8(password);
+  final passwordPointer = password.toNativeUtf8();
-  final languagePointer = Utf8.toUtf8(language);
+  final languagePointer = language.toNativeUtf8();
-  final addressPointer = Utf8.toUtf8(address);
+  final addressPointer = address.toNativeUtf8();
-  final viewKeyPointer = Utf8.toUtf8(viewKey);
+  final viewKeyPointer = viewKey.toNativeUtf8();
-  final spendKeyPointer = Utf8.toUtf8(spendKey);
+  final spendKeyPointer = spendKey.toNativeUtf8();
-  final errorMessagePointer = allocate<Utf8>();
+  final errorMessagePointer = ''.toNativeUtf8();
   final isWalletRestored = restoreWalletFromKeysNative(
           pathPointer,
           passwordPointer,
@@ -125,12 +125,12 @@ void restoreWalletFromKeysSync(
           errorMessagePointer) !=
       0;
 
-  free(pathPointer);
+  calloc.free(pathPointer);
-  free(passwordPointer);
+  calloc.free(passwordPointer);
-  free(languagePointer);
+  calloc.free(languagePointer);
-  free(addressPointer);
+  calloc.free(addressPointer);
-  free(viewKeyPointer);
+  calloc.free(viewKeyPointer);
-  free(spendKeyPointer);
+  calloc.free(spendKeyPointer);
 
   if (!isWalletRestored) {
     throw WalletRestoreFromKeysException(
@@ -138,12 +138,12 @@ void restoreWalletFromKeysSync(
   }
 }
 
-void loadWallet({String path, String password, int nettype = 0}) {
+void loadWallet({required String path, required String password, int nettype = 0}) {
-  final pathPointer = Utf8.toUtf8(path);
+  final pathPointer = path.toNativeUtf8();
-  final passwordPointer = Utf8.toUtf8(password);
+  final passwordPointer = password.toNativeUtf8();
   final loaded = loadWalletNative(pathPointer, passwordPointer, nettype) != 0;
-  free(pathPointer);
+  calloc.free(pathPointer);
-  free(passwordPointer);
+  calloc.free(passwordPointer);
 
   if (!loaded) {
     throw WalletOpeningException(
@@ -189,20 +189,20 @@ void _restoreFromKeys(Map<String, dynamic> args) {
 }
 
 Future<void> _openWallet(Map<String, String> args) async =>
-    loadWallet(path: args['path'], password: args['password']);
+    loadWallet(path: args['path'] as String, password: args['password'] as String);
 
 bool _isWalletExist(String path) => isWalletExistSync(path: path);
 
-void openWallet({String path, String password, int nettype = 0}) async =>
+void openWallet({required String path, required String password, int nettype = 0}) async =>
     loadWallet(path: path, password: password, nettype: nettype);
 
 Future<void> openWalletAsync(Map<String, String> args) async =>
     compute(_openWallet, args);
 
 Future<void> createWallet(
-        {String path,
+        {required String path,
-        String password,
+        required String password,
-        String language,
+        required String language,
         int nettype = 0}) async =>
     compute(_createWallet, {
       'path': path,
@@ -211,10 +211,10 @@ Future<void> createWallet(
       'nettype': nettype
     });
 
-Future restoreFromSeed(
+Future<void> restoreFromSeed(
-        {String path,
+        {required String path,
-        String password,
+        required String password,
-        String seed,
+        required String seed,
         int nettype = 0,
         int restoreHeight = 0}) async =>
     compute<Map<String, Object>, void>(_restoreFromSeed, {
@@ -225,13 +225,13 @@ Future restoreFromSeed(
       'restoreHeight': restoreHeight
     });
 
-Future restoreFromKeys(
+Future<void> restoreFromKeys(
-        {String path,
+        {required String path,
-        String password,
+        required String password,
-        String language,
+        required String language,
-        String address,
+        required String address,
-        String viewKey,
+        required String viewKey,
-        String spendKey,
+        required String spendKey,
         int nettype = 0,
         int restoreHeight = 0}) async =>
     compute<Map<String, Object>, void>(_restoreFromKeys, {
@@ -245,4 +245,4 @@ Future restoreFromKeys(
       'restoreHeight': restoreHeight
     });
 
-Future<bool> isWalletExist({String path}) => compute(_isWalletExist, path);
+Future<bool> isWalletExist({required String path}) => compute(_isWalletExist, path);

cw_haven/lib/haven_account_list.dart

@@ -53,13 +53,13 @@ abstract class HavenAccountListBase extends AccountList<Account> with Store {
       .toList();
   
   @override
-  Future addAccount({String label}) async {
+  Future<void> addAccount({required String label}) async {
     await account_list.addAccount(label: label);
     update();
   }
 
   @override
-  Future setLabelAccount({int accountIndex, String label}) async {
+  Future<void> setLabelAccount({required int accountIndex, required String label}) async {
     await account_list.setLabelForAccount(
         accountIndex: accountIndex, label: label);
     update();

cw_haven/lib/haven_balance.dart

@@ -9,7 +9,7 @@ const inactiveBalances = [
   CryptoCurrency.xnok,
   CryptoCurrency.xnzd]; 
 
-Map<CryptoCurrency, MoneroBalance> getHavenBalance({int accountIndex}) {
+Map<CryptoCurrency, MoneroBalance> getHavenBalance({required int accountIndex}) {
   final fullBalances = getHavenFullBalance(accountIndex: accountIndex);
   final unlockedBalances = getHavenUnlockedBalance(accountIndex: accountIndex);
   final havenBalances = <CryptoCurrency, MoneroBalance>{};

cw_haven/lib/haven_subaddress_list.dart

@@ -10,11 +10,10 @@ class HavenSubaddressList = HavenSubaddressListBase
     with _$HavenSubaddressList;
 
 abstract class HavenSubaddressListBase with Store {
-  HavenSubaddressListBase() {
+  HavenSubaddressListBase()
-    _isRefreshing = false;
+  : _isRefreshing = false,
-    _isUpdating = false;
+    _isUpdating = false,
     subaddresses = ObservableList<Subaddress>();
-  }
 
   @observable
   ObservableList<Subaddress> subaddresses;
@@ -22,7 +21,7 @@ abstract class HavenSubaddressListBase with Store {
   bool _isRefreshing;
   bool _isUpdating;
 
-  void update({int accountIndex}) {
+  void update({required int accountIndex}) {
     if (_isUpdating) {
       return;
     }
@@ -56,20 +55,20 @@ abstract class HavenSubaddressListBase with Store {
         .toList();
   }
 
-  Future addSubaddress({int accountIndex, String label}) async {
+  Future<void> addSubaddress({required int accountIndex, required String label}) async {
     await subaddress_list.addSubaddress(
         accountIndex: accountIndex, label: label);
     update(accountIndex: accountIndex);
   }
 
-  Future setLabelSubaddress(
+  Future<void> setLabelSubaddress(
-      {int accountIndex, int addressIndex, String label}) async {
+      {required int accountIndex, required int addressIndex, required String label}) async {
     await subaddress_list.setLabelForSubaddress(
         accountIndex: accountIndex, addressIndex: addressIndex, label: label);
     update(accountIndex: accountIndex);
   }
 
-  void refresh({int accountIndex}) {
+  void refresh({required int accountIndex}) {
     if (_isRefreshing) {
       return;
     }

cw_haven/lib/haven_transaction_creation_credentials.dart

@@ -2,7 +2,10 @@ import 'package:cw_core/monero_transaction_priority.dart';
 import 'package:cw_core/output_info.dart';
 
 class HavenTransactionCreationCredentials {
-  HavenTransactionCreationCredentials({this.outputs, this.priority, this.assetType});
+  HavenTransactionCreationCredentials({
+    required this.outputs,
+    required this.priority,
+    required this.assetType});
 
   final List<OutputInfo> outputs;
   final MoneroTransactionPriority priority;

cw_haven/lib/haven_transaction_info.dart

@@ -10,20 +10,20 @@ class HavenTransactionInfo extends TransactionInfo {
   HavenTransactionInfo(this.id, this.height, this.direction, this.date,
       this.isPending, this.amount, this.accountIndex, this.addressIndex, this.fee);
 
-  HavenTransactionInfo.fromMap(Map map)
+  HavenTransactionInfo.fromMap(Map<String, Object> map)
       : id = (map['hash'] ?? '') as String,
         height = (map['height'] ?? 0) as int,
         direction =
             parseTransactionDirectionFromNumber(map['direction'] as String) ??
                 TransactionDirection.incoming,
         date = DateTime.fromMillisecondsSinceEpoch(
-            (int.parse(map['timestamp'] as String) ?? 0) * 1000),
+            int.parse(map['timestamp'] as String? ?? '0') * 1000),
         isPending = parseBoolFromString(map['isPending'] as String),
         amount = map['amount'] as int,
         accountIndex = int.parse(map['accountIndex'] as String),
         addressIndex = map['addressIndex'] as int,
         key = getTxKey((map['hash'] ?? '') as String),
-        fee = map['fee'] as int ?? 0;
+        fee = map['fee'] as int? ?? 0;
 
     HavenTransactionInfo.fromRow(TransactionInfoRow row)
       : id = row.getHash(),
@@ -48,11 +48,10 @@ class HavenTransactionInfo extends TransactionInfo {
   final int amount;
   final int fee;
   final int addressIndex;
-  String recipientAddress;
+  late String recipientAddress;
-  String key;
+  late String assetType;
-  String assetType;
+  String? _fiatAmount;
-
+  String? key;
-  String _fiatAmount;
 
   @override
   String amountFormatted() =>

cw_haven/lib/haven_wallet.dart

@@ -37,15 +37,19 @@ class HavenWallet = HavenWalletBase with _$HavenWallet;
 
 abstract class HavenWalletBase extends WalletBase<MoneroBalance,
     HavenTransactionHistory, HavenTransactionInfo> with Store {
-  HavenWalletBase({WalletInfo walletInfo})
+  HavenWalletBase({required WalletInfo walletInfo})
-      : super(walletInfo) {
+      : balance = ObservableMap.of(getHavenBalance(accountIndex: 0)),
+        _isTransactionUpdating = false,
+        _hasSyncAfterStartup = false,
+        walletAddresses = HavenWalletAddresses(walletInfo),
+        syncStatus = NotConnectedSyncStatus(),
+        super(walletInfo) {
     transactionHistory = HavenTransactionHistory();
-    balance = ObservableMap.of(getHavenBalance(accountIndex: 0));
-    _isTransactionUpdating = false;
-    _hasSyncAfterStartup = false;
-    walletAddresses = HavenWalletAddresses(walletInfo);
     _onAccountChangeReaction = reaction((_) => walletAddresses.account,
-            (Account account) {
+            (Account? account) {
+      if (account == null) {
+        return;
+      }
       balance.addAll(getHavenBalance(accountIndex: account.id));
       walletAddresses.updateSubaddressList(accountIndex: account.id);
     });
@@ -74,15 +78,15 @@ abstract class HavenWalletBase extends WalletBase<MoneroBalance,
       publicSpendKey: haven_wallet.getPublicSpendKey(),
       publicViewKey: haven_wallet.getPublicViewKey());
 
-  haven_wallet.SyncListener _listener;
+  haven_wallet.SyncListener? _listener;
-  ReactionDisposer _onAccountChangeReaction;
+  ReactionDisposer? _onAccountChangeReaction;
   bool _isTransactionUpdating;
   bool _hasSyncAfterStartup;
-  Timer _autoSaveTimer;
+  Timer? _autoSaveTimer;
 
   Future<void> init() async {
     await walletAddresses.init();
-    balance.addAll(getHavenBalance(accountIndex: walletAddresses.account.id ?? 0));
+    balance.addAll(getHavenBalance(accountIndex: walletAddresses.account?.id ?? 0));
     _setListeners();
     await updateTransactions();
 
@@ -103,19 +107,19 @@ abstract class HavenWalletBase extends WalletBase<MoneroBalance,
   @override
   void close() {
     _listener?.stop();
-    _onAccountChangeReaction?.reaction?.dispose();
+    _onAccountChangeReaction?.reaction.dispose();
     _autoSaveTimer?.cancel();
   }
 
   @override
-  Future<void> connectToNode({@required Node node}) async {
+  Future<void> connectToNode({required Node node}) async {
     try {
       syncStatus = ConnectingSyncStatus();
       await haven_wallet.setupNode(
           address: node.uriRaw,
           login: node.login,
           password: node.password,
-          useSSL: node.useSSL,
+          useSSL: node.useSSL ?? false,
           isLightWallet: false); // FIXME: hardcoded value
       syncStatus = ConnectedSyncStatus();
     } catch (e) {
@@ -148,8 +152,8 @@ abstract class HavenWalletBase extends WalletBase<MoneroBalance,
     final outputs = _credentials.outputs;
     final hasMultiDestination = outputs.length > 1;
     final assetType = CryptoCurrency.fromString(_credentials.assetType.toLowerCase());
-    final balances = getHavenBalance(accountIndex: walletAddresses.account.id);
+    final balances = getHavenBalance(accountIndex: walletAddresses.account!.id);
-    final unlockedBalance = balances[assetType].unlockedBalance;
+    final unlockedBalance = balances[assetType]!.unlockedBalance;
 
     PendingTransactionDescription pendingTransactionDescription;
 
@@ -159,12 +163,12 @@ abstract class HavenWalletBase extends WalletBase<MoneroBalance,
 
     if (hasMultiDestination) {
       if (outputs.any((item) => item.sendAll
-          || item.formattedCryptoAmount <= 0)) {
+          || (item.formattedCryptoAmount ?? 0) <= 0)) {
         throw HavenTransactionCreationException('Wrong balance. Not enough XMR on your balance.');
       }
 
       final int totalAmount = outputs.fold(0, (acc, value) =>
-          acc + value.formattedCryptoAmount);
+          acc + (value.formattedCryptoAmount ?? 0));
 
       if (unlockedBalance < totalAmount) {
         throw HavenTransactionCreationException('Wrong balance. Not enough XMR on your balance.');
@@ -173,21 +177,21 @@ abstract class HavenWalletBase extends WalletBase<MoneroBalance,
       final moneroOutputs = outputs.map((output) =>
           MoneroOutput(
               address: output.address,
-              amount: output.cryptoAmount.replaceAll(',', '.')))
+              amount: output.cryptoAmount!.replaceAll(',', '.')))
           .toList();
 
       pendingTransactionDescription =
       await transaction_history.createTransactionMultDest(
           outputs: moneroOutputs,
           priorityRaw: _credentials.priority.serialize(),
-          accountIndex: walletAddresses.account.id);
+          accountIndex: walletAddresses.account!.id);
     } else {
       final output = outputs.first;
       final address = output.address;
       final amount = output.sendAll
           ? null
-          : output.cryptoAmount.replaceAll(',', '.');
+          : output.cryptoAmount!.replaceAll(',', '.');
-      final formattedAmount = output.sendAll
+      final int? formattedAmount = output.sendAll
           ? null
           : output.formattedCryptoAmount;
 
@@ -205,14 +209,14 @@ abstract class HavenWalletBase extends WalletBase<MoneroBalance,
           assetType: _credentials.assetType,
           amount: amount,
           priorityRaw: _credentials.priority.serialize(),
-          accountIndex: walletAddresses.account.id);
+          accountIndex: walletAddresses.account!.id);
     }
 
     return PendingHavenTransaction(pendingTransactionDescription, assetType);
   }
 
   @override
-  int calculateEstimatedFee(TransactionPriority priority, int amount) {
+  int calculateEstimatedFee(TransactionPriority priority, int? amount) {
     // FIXME: hardcoded value;
 
     if (priority is MoneroTransactionPriority) {
@@ -255,7 +259,7 @@ abstract class HavenWalletBase extends WalletBase<MoneroBalance,
   }
 
   @override
-  Future<void> rescan({int height}) async {
+  Future<void> rescan({required int height}) async {
     walletInfo.restoreHeight = height;
     walletInfo.isRecovery = true;
     haven_wallet.setRefreshFromBlockHeight(height: height);
@@ -346,7 +350,7 @@ abstract class HavenWalletBase extends WalletBase<MoneroBalance,
   }
 
   void _askForUpdateBalance() =>
-      balance.addAll(getHavenBalance(accountIndex: walletAddresses.account.id));
+      balance.addAll(getHavenBalance(accountIndex: walletAddresses.account!.id));
 
   Future<void> _askForUpdateTransactionHistory() async =>
       await updateTransactions();

cw_haven/lib/haven_wallet_addresses.dart

@@ -12,21 +12,22 @@ class HavenWalletAddresses = HavenWalletAddressesBase
     with _$HavenWalletAddresses;
 
 abstract class HavenWalletAddressesBase extends WalletAddressesWithAccount<Account> with Store {
-  HavenWalletAddressesBase(WalletInfo walletInfo) : super(walletInfo) {
+  HavenWalletAddressesBase(WalletInfo walletInfo)
-    accountList = HavenAccountList();
+    : accountList = HavenAccountList(),
-    subaddressList = HavenSubaddressList();
+      subaddressList = HavenSubaddressList(),
-  }
+      address = '',
+      super(walletInfo);
 
   @override
   @observable
   String address;
   
-  @override
+  // @override
   @observable
-  Account account;
+  Account? account;
 
   @observable
-  Subaddress subaddress;
+  Subaddress? subaddress;
 
   HavenSubaddressList subaddressList;
   
@@ -36,7 +37,7 @@ abstract class HavenWalletAddressesBase extends WalletAddressesWithAccount<Accou
   Future<void> init() async {
     accountList.update();
     account = accountList.accounts.first;
-    updateSubaddressList(accountIndex: account.id ?? 0);
+    updateSubaddressList(accountIndex: account?.id ?? 0);
     await updateAddressesInBox();
   }
 
@@ -62,14 +63,14 @@ abstract class HavenWalletAddressesBase extends WalletAddressesWithAccount<Accou
 
   bool validate() {
     accountList.update();
-    final accountListLength = accountList.accounts?.length ?? 0;
+    final accountListLength = accountList.accounts.length ?? 0;
 
     if (accountListLength <= 0) {
       return false;
     }
 
     subaddressList.update(accountIndex: accountList.accounts.first.id);
-    final subaddressListLength = subaddressList.subaddresses?.length ?? 0;
+    final subaddressListLength = subaddressList.subaddresses.length ?? 0;
 
     if (subaddressListLength <= 0) {
       return false;
@@ -78,9 +79,9 @@ abstract class HavenWalletAddressesBase extends WalletAddressesWithAccount<Accou
     return true;
   }
 
-  void updateSubaddressList({int accountIndex}) {
+  void updateSubaddressList({required int accountIndex}) {
     subaddressList.update(accountIndex: accountIndex);
     subaddress = subaddressList.subaddresses.first;
-    address = subaddress.address;
+    address = subaddress!.address;
   }
 }

cw_haven/lib/haven_wallet_service.dart

@@ -1,4 +1,5 @@
 import 'dart:io';
+import 'package:collection/collection.dart';
 import 'package:cw_core/wallet_base.dart';
 import 'package:cw_core/monero_wallet_utils.dart';
 import 'package:hive/hive.dart';
@@ -13,7 +14,7 @@ import 'package:cw_core/wallet_info.dart';
 import 'package:cw_core/wallet_type.dart';
 
 class HavenNewWalletCredentials extends WalletCredentials {
-  HavenNewWalletCredentials({String name, String password, this.language})
+  HavenNewWalletCredentials({required String name, required this.language, String? password})
       : super(name: name, password: password);
 
   final String language;
@@ -21,7 +22,10 @@ class HavenNewWalletCredentials extends WalletCredentials {
 
 class HavenRestoreWalletFromSeedCredentials extends WalletCredentials {
   HavenRestoreWalletFromSeedCredentials(
-      {String name, String password, int height, this.mnemonic})
+      {required String name,
+      required String password,
+      required int height,
+      required this.mnemonic})
       : super(name: name, password: password, height: height);
 
   final String mnemonic;
@@ -34,13 +38,13 @@ class HavenWalletLoadingException implements Exception {
 
 class HavenRestoreWalletFromKeysCredentials extends WalletCredentials {
   HavenRestoreWalletFromKeysCredentials(
-      {String name,
+      {required String name,
-      String password,
+      required String password,
-      this.language,
+      required this.language,
-      this.address,
+      required this.address,
-      this.viewKey,
+      required this.viewKey,
-      this.spendKey,
+      required this.spendKey,
-      int height})
+      required int height})
       : super(name: name, password: password, height: height);
 
   final String language;
@@ -69,9 +73,9 @@ class HavenWalletService extends WalletService<
       final path = await pathForWallet(name: credentials.name, type: getType());
       await haven_wallet_manager.createWallet(
           path: path,
-          password: credentials.password,
+          password: credentials.password!,
           language: credentials.language);
-      final wallet = HavenWallet(walletInfo: credentials.walletInfo);
+      final wallet = HavenWallet(walletInfo: credentials.walletInfo!);
       await wallet.init();
       return wallet;
     } catch (e) {
@@ -104,9 +108,8 @@ class HavenWalletService extends WalletService<
 
       await haven_wallet_manager
           .openWalletAsync({'path': path, 'password': password});
-      final walletInfo = walletInfoSource.values.firstWhere(
+      final walletInfo = walletInfoSource.values.firstWhereOrNull(
-          (info) => info.id == WalletBase.idFor(name, getType()),
+          (info) => info.id == WalletBase.idFor(name, getType()))!;
-          orElse: () => null);
       final wallet = HavenWallet(walletInfo: walletInfo);
       final isValid = wallet.walletAddresses.validate();
 
@@ -155,13 +158,13 @@ class HavenWalletService extends WalletService<
       final path = await pathForWallet(name: credentials.name, type: getType());
       await haven_wallet_manager.restoreFromKeys(
           path: path,
-          password: credentials.password,
+          password: credentials.password!,
           language: credentials.language,
-          restoreHeight: credentials.height,
+          restoreHeight: credentials.height!,
           address: credentials.address,
           viewKey: credentials.viewKey,
           spendKey: credentials.spendKey);
-      final wallet = HavenWallet(walletInfo: credentials.walletInfo);
+      final wallet = HavenWallet(walletInfo: credentials.walletInfo!);
       await wallet.init();
 
       return wallet;
@@ -179,10 +182,10 @@ class HavenWalletService extends WalletService<
       final path = await pathForWallet(name: credentials.name, type: getType());
       await haven_wallet_manager.restoreFromSeed(
           path: path,
-          password: credentials.password,
+          password: credentials.password!,
           seed: credentials.mnemonic,
-          restoreHeight: credentials.height);
+          restoreHeight: credentials.height!);
-      final wallet = HavenWallet(walletInfo: credentials.walletInfo);
+      final wallet = HavenWallet(walletInfo: credentials.walletInfo!);
       await wallet.init();
 
       return wallet;

cw_haven/lib/pending_haven_transaction.dart

@@ -2,7 +2,7 @@ import 'package:cw_haven/api/structs/pending_transaction.dart';
 import 'package:cw_haven/api/transaction_history.dart'
     as haven_transaction_history;
 import 'package:cw_core/crypto_currency.dart';
-import 'package:cake_wallet/core/amount_converter.dart';
+// import 'package:cake_wallet/core/amount_converter.dart';
 import 'package:cw_core/pending_transaction.dart';
 
 class DoubleSpendException implements Exception {
@@ -25,13 +25,17 @@ class PendingHavenTransaction with PendingTransaction {
   @override
   String get hex => '';
 
+  // FIX-ME: AmountConverter
   @override
-  String get amountFormatted => AmountConverter.amountIntToString(
+  String get amountFormatted => '';
-      cryptoCurrency, pendingTransactionDescription.amount);
+    // AmountConverter.amountIntToString(
+    //   cryptoCurrency, pendingTransactionDescription.amount);
 
+  // FIX-ME: AmountConverter
   @override
-  String get feeFormatted => AmountConverter.amountIntToString(
+  String get feeFormatted => '';
-      cryptoCurrency, pendingTransactionDescription.fee);
+    // AmountConverter.amountIntToString(
+    //   cryptoCurrency, pendingTransactionDescription.fee);
 
   @override
   Future<void> commit() async {

cw_haven/lib/update_haven_rate.dart

@@ -1,7 +1,7 @@
 //import 'package:cake_wallet/store/dashboard/fiat_conversion_store.dart';
 import 'package:cw_core/crypto_currency.dart';
 import 'package:cw_core/monero_amount_format.dart';
-import 'package:cw_haven/balance_list.dart';
+import 'package:cw_haven/api/balance_list.dart';
 
 //Future<void> updateHavenRate(FiatConversionStore fiatConversionStore) async {
 //  final rate = getRate();

cw_haven/pubspec.lock

@@ -7,35 +7,35 @@ packages:
       name: _fe_analyzer_shared
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "14.0.0"
+    version: "47.0.0"
   analyzer:
     dependency: transitive
     description:
       name: analyzer
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.41.2"
+    version: "4.7.0"
   args:
     dependency: transitive
     description:
       name: args
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.0"
+    version: "2.3.1"
   asn1lib:
     dependency: transitive
     description:
       name: asn1lib
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.8.1"
+    version: "1.1.1"
   async:
     dependency: transitive
     description:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.5.0"
+    version: "2.9.0"
   boolean_selector:
     dependency: transitive
     description:
@@ -49,42 +49,42 @@ packages:
       name: build
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.2"
+    version: "2.3.1"
   build_config:
     dependency: transitive
     description:
       name: build_config
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.6"
+    version: "1.1.0"
   build_daemon:
     dependency: transitive
     description:
       name: build_daemon
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.10"
+    version: "3.1.0"
   build_resolvers:
     dependency: "direct dev"
     description:
       name: build_resolvers
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.5.3"
+    version: "2.0.10"
   build_runner:
     dependency: "direct dev"
     description:
       name: build_runner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.11.5"
+    version: "2.2.1"
   build_runner_core:
     dependency: transitive
     description:
       name: build_runner_core
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.1.10"
+    version: "7.2.4"
   built_collection:
     dependency: transitive
     description:
@@ -105,63 +105,49 @@ packages:
       name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.1"
-  charcode:
-    dependency: transitive
-    description:
-      name: charcode
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.2.0"
   checked_yaml:
     dependency: transitive
     description:
       name: checked_yaml
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.4"
+    version: "2.0.1"
-  cli_util:
-    dependency: transitive
-    description:
-      name: cli_util
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.3.5"
   clock:
     dependency: transitive
     description:
       name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.1.1"
   code_builder:
     dependency: transitive
     description:
       name: code_builder
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.7.0"
+    version: "4.3.0"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.15.0"
+    version: "1.16.0"
   convert:
     dependency: transitive
     description:
       name: convert
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.1"
+    version: "3.0.2"
   crypto:
     dependency: transitive
     description:
       name: crypto
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.5"
+    version: "3.0.2"
   cw_core:
     dependency: "direct main"
     description:
@@ -175,35 +161,28 @@ packages:
       name: dart_style
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.12"
+    version: "2.2.4"
-  dartx:
-    dependency: transitive
-    description:
-      name: dartx
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.5.0"
   encrypt:
     dependency: transitive
     description:
       name: encrypt
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.1.0"
+    version: "5.0.1"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.1"
   ffi:
     dependency: "direct main"
     description:
       name: ffi
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.3"
+    version: "1.2.1"
   file:
     dependency: transitive
     description:
@@ -229,12 +208,19 @@ packages:
       name: flutter_mobx
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0+2"
+    version: "2.0.6+4"
   flutter_test:
     dependency: "direct dev"
     description: flutter
     source: sdk
     version: "0.0.0"
+  frontend_server_client:
+    dependency: transitive
+    description:
+      name: frontend_server_client
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.3"
   glob:
     dependency: transitive
     description:
@@ -248,42 +234,42 @@ packages:
       name: graphs
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.0"
+    version: "2.1.0"
   hive:
     dependency: transitive
     description:
       name: hive
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.4.4+1"
+    version: "2.2.3"
   hive_generator:
     dependency: "direct dev"
     description:
       name: hive_generator
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.8.2"
+    version: "1.1.3"
   http:
     dependency: "direct main"
     description:
       name: http
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.2"
+    version: "0.13.5"
   http_multi_server:
     dependency: transitive
     description:
       name: http_multi_server
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "3.2.1"
   http_parser:
     dependency: transitive
     description:
       name: http_parser
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.1.4"
+    version: "4.0.1"
   intl:
     dependency: "direct main"
     description:
@@ -297,7 +283,7 @@ packages:
       name: io
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.5"
+    version: "1.0.3"
   js:
     dependency: transitive
     description:
@@ -311,7 +297,7 @@ packages:
       name: json_annotation
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.0.1"
+    version: "4.6.0"
   logging:
     dependency: transitive
     description:
@@ -325,14 +311,21 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.10"
+    version: "0.12.12"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.5"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0"
+    version: "1.8.0"
   mime:
     dependency: transitive
     description:
@@ -346,63 +339,77 @@ packages:
       name: mobx
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.1+4"
+    version: "2.1.0"
   mobx_codegen:
     dependency: "direct dev"
     description:
       name: mobx_codegen
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.2"
+    version: "2.0.7+3"
   package_config:
     dependency: transitive
     description:
       name: package_config
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.3"
+    version: "2.1.0"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0"
+    version: "1.8.2"
   path_provider:
     dependency: "direct main"
     description:
       name: path_provider
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.28"
+    version: "2.0.11"
+  path_provider_android:
+    dependency: transitive
+    description:
+      name: path_provider_android
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.20"
+  path_provider_ios:
+    dependency: transitive
+    description:
+      name: path_provider_ios
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.11"
   path_provider_linux:
     dependency: transitive
     description:
       name: path_provider_linux
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.1+2"
+    version: "2.1.7"
   path_provider_macos:
     dependency: transitive
     description:
       name: path_provider_macos
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.4+8"
+    version: "2.0.6"
   path_provider_platform_interface:
     dependency: transitive
     description:
       name: path_provider_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.4"
+    version: "2.0.4"
   path_provider_windows:
     dependency: transitive
     description:
       name: path_provider_windows
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.4+3"
+    version: "2.0.7"
   pedantic:
     dependency: transitive
     description:
@@ -423,14 +430,14 @@ packages:
       name: plugin_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.3"
+    version: "2.1.3"
   pointycastle:
     dependency: transitive
     description:
       name: pointycastle
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.1"
+    version: "3.6.2"
   pool:
     dependency: transitive
     description:
@@ -458,21 +465,21 @@ packages:
       name: pubspec_parse
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.8"
+    version: "1.2.1"
   shelf:
     dependency: transitive
     description:
       name: shelf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.7.9"
+    version: "1.3.2"
   shelf_web_socket:
     dependency: transitive
     description:
       name: shelf_web_socket
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.4+1"
+    version: "1.0.2"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -484,14 +491,21 @@ packages:
       name: source_gen
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.10+3"
+    version: "1.2.3"
+  source_helper:
+    dependency: transitive
+    description:
+      name: source_helper
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.3.3"
   source_span:
     dependency: transitive
     description:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0"
+    version: "1.9.0"
   stack_trace:
     dependency: transitive
     description:
@@ -519,35 +533,28 @@ packages:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.1.1"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.2.1"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.19"
+    version: "0.4.12"
-  time:
-    dependency: transitive
-    description:
-      name: time
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.4.1"
   timing:
     dependency: transitive
     description:
       name: timing
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.1+3"
+    version: "1.0.0"
   typed_data:
     dependency: transitive
     description:
@@ -561,7 +568,7 @@ packages:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0"
+    version: "2.1.2"
   watcher:
     dependency: transitive
     description:
@@ -575,21 +582,21 @@ packages:
       name: web_socket_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "2.2.0"
   win32:
     dependency: transitive
     description:
       name: win32
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.4+1"
+    version: "2.6.1"
   xdg_directories:
     dependency: transitive
     description:
       name: xdg_directories
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.2"
+    version: "0.2.0+2"
   yaml:
     dependency: transitive
     description:
@@ -598,5 +605,5 @@ packages:
     source: hosted
     version: "3.1.0"
 sdks:
-  dart: ">=2.12.0 <3.0.0"
+  dart: ">=2.17.5 <3.0.0"
-  flutter: ">=1.20.0"
+  flutter: ">=2.8.1"

cw_haven/pubspec.yaml

@@ -6,17 +6,17 @@ author: Cake Wallet
 homepage: https://cakewallet.com
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: ">=2.17.5 <3.0.0"
   flutter: ">=1.20.0"
 
 dependencies:
   flutter:
     sdk: flutter
-  ffi: ^0.1.3
+  ffi: ^1.1.2
-  path_provider: ^1.4.0
+  http: ^0.13.4
-  http: ^0.12.0+2
+  path_provider: ^2.0.11
-  mobx: ^1.2.1+2
+  mobx: ^2.0.7+4
-  flutter_mobx: ^1.1.0+2
+  flutter_mobx: ^2.0.6+1
   intl: ^0.17.0
   cw_core:
     path: ../cw_core
@@ -24,10 +24,10 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  build_runner: ^1.10.3
+  build_runner: ^2.1.11
-  build_resolvers: ^1.3.10
+  mobx_codegen: ^2.0.7
-  mobx_codegen: ^1.1.0+1
+  build_resolvers: ^2.0.9
-  hive_generator: ^0.8.1
+  hive_generator: ^1.1.3
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec

cw_monero/lib/api/account_list.dart

@@ -50,16 +50,16 @@ List<AccountRow> getAllAccount() {
       .toList();
 }
 
-void addAccountSync({String label}) {
+void addAccountSync({required String label}) {
-  final labelPointer = Utf8.toUtf8(label);
+  final labelPointer = label.toNativeUtf8();
   accountAddNewNative(labelPointer);
-  free(labelPointer);
+  calloc.free(labelPointer);
 }
 
-void setLabelForAccountSync({int accountIndex, String label}) {
+void setLabelForAccountSync({required int accountIndex, required String label}) {
-  final labelPointer = Utf8.toUtf8(label);
+  final labelPointer = label.toNativeUtf8();
   accountSetLabelNative(accountIndex, labelPointer);
-  free(labelPointer);
+  calloc.free(labelPointer);
 }
 
 void _addAccount(String label) => addAccountSync(label: label);
@@ -71,12 +71,12 @@ void _setLabelForAccount(Map<String, dynamic> args) {
   setLabelForAccountSync(label: label, accountIndex: accountIndex);
 }
 
-Future<void> addAccount({String label}) async {
+Future<void> addAccount({required String label}) async {
   await compute(_addAccount, label);
   await store();
 }
 
-Future<void> setLabelForAccount({int accountIndex, String label}) async {
+Future<void> setLabelForAccount({required int accountIndex, required String label}) async {
     await compute(
         _setLabelForAccount, {'accountIndex': accountIndex, 'label': label});
     await store();

cw_monero/lib/api/convert_utf8_to_string.dart

@@ -1,8 +1,8 @@
 import 'dart:ffi';
 import 'package:ffi/ffi.dart';
 
-String convertUTF8ToString({Pointer<Utf8> pointer}) {
+String convertUTF8ToString({required Pointer<Utf8> pointer}) {
-  final str = Utf8.fromUtf8(pointer);
+  final str = pointer.toDartString();
-  free(pointer);
+  calloc.free(pointer);
   return str;
 }

cw_monero/lib/api/exceptions/connection_to_node_exception.dart

@@ -1,5 +1,5 @@
 class ConnectionToNodeException implements Exception {
-  ConnectionToNodeException({this.message});
+  ConnectionToNodeException({required this.message});
 
   final String message;
 }

cw_monero/lib/api/exceptions/creation_transaction_exception.dart

@@ -1,5 +1,5 @@
 class CreationTransactionException implements Exception {
-  CreationTransactionException({this.message});
+  CreationTransactionException({required this.message});
   
   final String message;