solving dart migrate errors

@@ -13,74 +13,74 @@ export 'http/src/response/response.dart';
 export 'sockets/sockets.dart';
 export 'sockets/sockets.dart';
 
 
 abstract class GetConnectInterface with GetLifeCycleBase {
 abstract class GetConnectInterface with GetLifeCycleBase {
-  List<GetSocket> sockets;
+  List<GetSocket>? sockets;
   GetHttpClient get httpClient;
   GetHttpClient get httpClient;
 
 
   Future<Response<T>> get<T>(
   Future<Response<T>> get<T>(
     String url, {
     String url, {
-    Map<String, String> headers,
-    String contentType,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
+    Map<String, String>? headers,
+    String? contentType,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
   });
   });
 
 
   Future<Response<T>> request<T>(
   Future<Response<T>> request<T>(
     String url,
     String url,
     String method, {
     String method, {
     dynamic body,
     dynamic body,
-    String contentType,
-    Map<String, String> headers,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
+    String? contentType,
+    Map<String, String>? headers,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
   });
   });
   Future<Response<T>> post<T>(
   Future<Response<T>> post<T>(
     String url,
     String url,
     dynamic body, {
     dynamic body, {
-    String contentType,
-    Map<String, String> headers,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
+    String? contentType,
+    Map<String, String>? headers,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
   });
   });
 
 
   Future<Response<T>> put<T>(
   Future<Response<T>> put<T>(
     String url,
     String url,
     dynamic body, {
     dynamic body, {
-    String contentType,
-    Map<String, String> headers,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
+    String? contentType,
+    Map<String, String>? headers,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
   });
   });
 
 
   Future<Response<T>> delete<T>(
   Future<Response<T>> delete<T>(
     String url, {
     String url, {
-    Map<String, String> headers,
-    String contentType,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
+    Map<String, String>? headers,
+    String? contentType,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
   });
   });
 
 
   Future<Response<T>> patch<T>(
   Future<Response<T>> patch<T>(
     String url,
     String url,
     dynamic body, {
     dynamic body, {
-    String contentType,
-    Map<String, String> headers,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
-    Progress uploadProgress,
+    String? contentType,
+    Map<String, String>? headers,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
+    Progress? uploadProgress,
   });
   });
 
 
   Future<GraphQLResponse<T>> query<T>(
   Future<GraphQLResponse<T>> query<T>(
     String query, {
     String query, {
-    String url,
-    Map<String, dynamic> variables,
-    Map<String, String> headers,
+    String? url,
+    Map<String, dynamic>? variables,
+    Map<String, String>? headers,
   });
   });
 
 
   Future<GraphQLResponse<T>> mutation<T>(
   Future<GraphQLResponse<T>> mutation<T>(
     String mutation, {
     String mutation, {
-    String url,
-    Map<String, dynamic> variables,
-    Map<String, String> headers,
+    String? url,
+    Map<String, dynamic>? variables,
+    Map<String, String>? headers,
   });
   });
 
 
   GetSocket socket(
   GetSocket socket(
@@ -103,16 +103,16 @@ class GetConnect extends GetConnectInterface {
 
 
   bool allowAutoSignedCert;
   bool allowAutoSignedCert;
   String userAgent;
   String userAgent;
-  String baseUrl;
+  String? baseUrl;
   String defaultContentType = 'application/json; charset=utf-8';
   String defaultContentType = 'application/json; charset=utf-8';
   bool followRedirects;
   bool followRedirects;
   int maxRedirects;
   int maxRedirects;
   int maxAuthRetries;
   int maxAuthRetries;
-  Decoder defaultDecoder;
+  Decoder? defaultDecoder;
   Duration timeout;
   Duration timeout;
-  List<TrustedCertificate> trustedCertificates;
-  GetHttpClient _httpClient;
-  List<GetSocket> _sockets;
+  List<TrustedCertificate>? trustedCertificates;
+  GetHttpClient? _httpClient;
+  List<GetSocket>? _sockets;
 
 
   @override
   @override
   List<GetSocket> get sockets => _sockets ??= <GetSocket>[];
   List<GetSocket> get sockets => _sockets ??= <GetSocket>[];
@@ -132,10 +132,10 @@ class GetConnect extends GetConnectInterface {
   @override
   @override
   Future<Response<T>> get<T>(
   Future<Response<T>> get<T>(
     String url, {
     String url, {
-    Map<String, String> headers,
-    String contentType,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
+    Map<String, String>? headers,
+    String? contentType,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
   }) {
   }) {
     _checkIfDisposed();
     _checkIfDisposed();
     return httpClient.get<T>(
     return httpClient.get<T>(
@@ -149,13 +149,13 @@ class GetConnect extends GetConnectInterface {
 
 
   @override
   @override
   Future<Response<T>> post<T>(
   Future<Response<T>> post<T>(
-    String url,
+    String? url,
     dynamic body, {
     dynamic body, {
-    String contentType,
-    Map<String, String> headers,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
-    Progress uploadProgress,
+    String? contentType,
+    Map<String, String>? headers,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
+    Progress? uploadProgress,
   }) {
   }) {
     _checkIfDisposed();
     _checkIfDisposed();
     return httpClient.post<T>(
     return httpClient.post<T>(
@@ -173,11 +173,11 @@ class GetConnect extends GetConnectInterface {
   Future<Response<T>> put<T>(
   Future<Response<T>> put<T>(
     String url,
     String url,
     dynamic body, {
     dynamic body, {
-    String contentType,
-    Map<String, String> headers,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
-    Progress uploadProgress,
+    String? contentType,
+    Map<String, String>? headers,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
+    Progress? uploadProgress,
   }) {
   }) {
     _checkIfDisposed();
     _checkIfDisposed();
     return httpClient.put<T>(
     return httpClient.put<T>(
@@ -195,11 +195,11 @@ class GetConnect extends GetConnectInterface {
   Future<Response<T>> patch<T>(
   Future<Response<T>> patch<T>(
     String url,
     String url,
     dynamic body, {
     dynamic body, {
-    String contentType,
-    Map<String, String> headers,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
-    Progress uploadProgress,
+    String? contentType,
+    Map<String, String>? headers,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
+    Progress? uploadProgress,
   }) {
   }) {
     _checkIfDisposed();
     _checkIfDisposed();
     return httpClient.patch<T>(
     return httpClient.patch<T>(
@@ -218,11 +218,11 @@ class GetConnect extends GetConnectInterface {
     String url,
     String url,
     String method, {
     String method, {
     dynamic body,
     dynamic body,
-    String contentType,
-    Map<String, String> headers,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
-    Progress uploadProgress,
+    String? contentType,
+    Map<String, String>? headers,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
+    Progress? uploadProgress,
   }) {
   }) {
     _checkIfDisposed();
     _checkIfDisposed();
     return httpClient.request<T>(
     return httpClient.request<T>(
@@ -240,10 +240,10 @@ class GetConnect extends GetConnectInterface {
   @override
   @override
   Future<Response<T>> delete<T>(
   Future<Response<T>> delete<T>(
     String url, {
     String url, {
-    Map<String, String> headers,
-    String contentType,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
+    Map<String, String>? headers,
+    String? contentType,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
   }) {
   }) {
     _checkIfDisposed();
     _checkIfDisposed();
     return httpClient.delete(
     return httpClient.delete(
@@ -267,9 +267,9 @@ class GetConnect extends GetConnectInterface {
     return _socket;
     return _socket;
   }
   }
 
 
-  String _concatUrl(String url) {
+  String? _concatUrl(String? url) {
     if (url == null) return baseUrl;
     if (url == null) return baseUrl;
-    return baseUrl == null ? url : baseUrl + url;
+    return baseUrl == null ? url : baseUrl! + url;
   }
   }
 
 
   /// query allow made GraphQL raw querys
   /// query allow made GraphQL raw querys
@@ -294,9 +294,9 @@ class GetConnect extends GetConnectInterface {
   @override
   @override
   Future<GraphQLResponse<T>> query<T>(
   Future<GraphQLResponse<T>> query<T>(
     String query, {
     String query, {
-    String url,
-    Map<String, dynamic> variables,
-    Map<String, String> headers,
+    String? url,
+    Map<String, dynamic>? variables,
+    Map<String, String>? headers,
   }) async {
   }) async {
     try {
     try {
       final res = await post(
       final res = await post(
@@ -316,7 +316,7 @@ class GetConnect extends GetConnectInterface {
                     ))
                     ))
                 .toList());
                 .toList());
       }
       }
-      return GraphQLResponse<T>(body: res.body['data'] as T);
+      return GraphQLResponse<T>(body: res.body['data'] as T?);
     } on Exception catch (_) {
     } on Exception catch (_) {
       return GraphQLResponse<T>(graphQLErrors: [
       return GraphQLResponse<T>(graphQLErrors: [
         GraphQLError(
         GraphQLError(
@@ -330,9 +330,9 @@ class GetConnect extends GetConnectInterface {
   @override
   @override
   Future<GraphQLResponse<T>> mutation<T>(
   Future<GraphQLResponse<T>> mutation<T>(
     String mutation, {
     String mutation, {
-    String url,
-    Map<String, dynamic> variables,
-    Map<String, String> headers,
+    String? url,
+    Map<String, dynamic>? variables,
+    Map<String, String>? headers,
   }) async {
   }) async {
     try {
     try {
       final res = await post(
       final res = await post(
@@ -352,7 +352,7 @@ class GetConnect extends GetConnectInterface {
                     ))
                     ))
                 .toList());
                 .toList());
       }
       }
-      return GraphQLResponse<T>(body: res.body['data'] as T);
+      return GraphQLResponse<T>(body: res.body['data'] as T?);
     } on Exception catch (_) {
     } on Exception catch (_) {
       return GraphQLResponse<T>(graphQLErrors: [
       return GraphQLResponse<T>(graphQLErrors: [
         GraphQLError(
         GraphQLError(

 class GetHttpException implements Exception {
 class GetHttpException implements Exception {
   final String message;
   final String message;
 
 
-  final Uri uri;
+  final Uri? uri;
 
 
   GetHttpException(this.message, [this.uri]);
   GetHttpException(this.message, [this.uri]);
 
 
@@ -11,8 +11,8 @@ class GetHttpException implements Exception {
 
 
 class GraphQLError {
 class GraphQLError {
   GraphQLError({this.code, this.message});
   GraphQLError({this.code, this.message});
-  final String message;
-  final String code;
+  final String? message;
+  final String? code;
 
 
   @override
   @override
   String toString() => 'GETCONNECT ERROR:\n\tcode:$code\n\tmessage:$message';
   String toString() => 'GETCONNECT ERROR:\n\tcode:$code\n\tmessage:$message';

@@ -20,7 +20,7 @@ typedef Progress = Function(double percent);
 
 
 class GetHttpClient {
 class GetHttpClient {
   String userAgent;
   String userAgent;
-  String baseUrl;
+  String? baseUrl;
 
 
   String defaultContentType = 'application/json; charset=utf-8';
   String defaultContentType = 'application/json; charset=utf-8';
 
 
@@ -28,7 +28,7 @@ class GetHttpClient {
   int maxRedirects;
   int maxRedirects;
   int maxAuthRetries;
   int maxAuthRetries;
 
 
-  Decoder defaultDecoder;
+  Decoder? defaultDecoder;
 
 
   Duration timeout;
   Duration timeout;
 
 
@@ -46,7 +46,7 @@ class GetHttpClient {
     this.maxAuthRetries = 1,
     this.maxAuthRetries = 1,
     bool allowAutoSignedCert = false,
     bool allowAutoSignedCert = false,
     this.baseUrl,
     this.baseUrl,
-    List<TrustedCertificate> trustedCertificates,
+    List<TrustedCertificate>? trustedCertificates,
   })  : _httpClient = HttpRequestImpl(
   })  : _httpClient = HttpRequestImpl(
           allowAutoSignedCert: allowAutoSignedCert,
           allowAutoSignedCert: allowAutoSignedCert,
           trustedCertificates: trustedCertificates,
           trustedCertificates: trustedCertificates,
@@ -73,11 +73,11 @@ class GetHttpClient {
     _modifier.removeResponseModifier<T>(interceptor);
     _modifier.removeResponseModifier<T>(interceptor);
   }
   }
 
 
-  Uri _createUri(String url, Map<String, dynamic> query) {
+  Uri _createUri(String? url, Map<String, dynamic>? query) {
     if (baseUrl != null) {
     if (baseUrl != null) {
-      url = baseUrl + url;
+      url = baseUrl! + url!;
     }
     }
-    final uri = Uri.parse(url);
+    final uri = Uri.parse(url!);
     if (query != null) {
     if (query != null) {
       return uri.replace(queryParameters: query);
       return uri.replace(queryParameters: query);
     }
     }
@@ -85,16 +85,16 @@ class GetHttpClient {
   }
   }
 
 
   Future<Request<T>> _requestWithBody<T>(
   Future<Request<T>> _requestWithBody<T>(
-    String url,
-    String contentType,
+    String? url,
+    String? contentType,
     dynamic body,
     dynamic body,
     String method,
     String method,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
-    Progress uploadProgress,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
+    Progress? uploadProgress,
   ) async {
   ) async {
-    List<int> bodyBytes;
-    BodyBytesStream bodyStream;
+    List<int>? bodyBytes;
+    BodyBytesStream? bodyStream;
     final headers = <String, String>{};
     final headers = <String, String>{};
 
 
     headers['user-agent'] = userAgent;
     headers['user-agent'] = userAgent;
@@ -139,7 +139,7 @@ class GetHttpClient {
       url: uri,
       url: uri,
       headers: headers,
       headers: headers,
       bodyBytes: bodyStream,
       bodyBytes: bodyStream,
-      contentLength: bodyBytes.length,
+      contentLength: bodyBytes!.length,
       followRedirects: followRedirects,
       followRedirects: followRedirects,
       maxRedirects: maxRedirects,
       maxRedirects: maxRedirects,
       decoder: decoder,
       decoder: decoder,
@@ -148,7 +148,7 @@ class GetHttpClient {
 
 
   BodyBytesStream _trackProgress(
   BodyBytesStream _trackProgress(
     List<int> bodyBytes,
     List<int> bodyBytes,
-    Progress uploadProgress,
+    Progress? uploadProgress,
   ) {
   ) {
     var total = 0;
     var total = 0;
     var length = bodyBytes.length;
     var length = bodyBytes.length;
@@ -169,7 +169,7 @@ class GetHttpClient {
 
 
   void _setSimpleHeaders(
   void _setSimpleHeaders(
     Map<String, String> headers,
     Map<String, String> headers,
-    String contentType,
+    String? contentType,
   ) {
   ) {
     headers['content-type'] = contentType ?? defaultContentType;
     headers['content-type'] = contentType ?? defaultContentType;
     headers['user-agent'] = userAgent;
     headers['user-agent'] = userAgent;
@@ -179,7 +179,7 @@ class GetHttpClient {
     HandlerExecute<T> handler, {
     HandlerExecute<T> handler, {
     bool authenticate = false,
     bool authenticate = false,
     int requestNumber = 1,
     int requestNumber = 1,
-    Map<String, String> headers,
+    Map<String, String>? headers,
   }) async {
   }) async {
     try {
     try {
       var request = await handler();
       var request = await handler();
@@ -188,7 +188,7 @@ class GetHttpClient {
         request.headers[key] = value;
         request.headers[key] = value;
       });
       });
 
 
-      if (authenticate) await _modifier.authenticator(request);
+      if (authenticate) await _modifier.authenticator!(request);
       await _modifier.modifyRequest(request);
       await _modifier.modifyRequest(request);
 
 
       var response = await _httpClient.send<T>(request);
       var response = await _httpClient.send<T>(request);
@@ -238,9 +238,9 @@ class GetHttpClient {
 
 
   Future<Request<T>> _get<T>(
   Future<Request<T>> _get<T>(
     String url,
     String url,
-    String contentType,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
+    String? contentType,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
   ) {
   ) {
     final headers = <String, String>{};
     final headers = <String, String>{};
     _setSimpleHeaders(headers, contentType);
     _setSimpleHeaders(headers, contentType);
@@ -250,18 +250,18 @@ class GetHttpClient {
       method: 'get',
       method: 'get',
       url: uri,
       url: uri,
       headers: headers,
       headers: headers,
-      decoder: decoder ?? (defaultDecoder as Decoder<T>),
+      decoder: decoder ?? (defaultDecoder as Decoder<T>?),
     ));
     ));
   }
   }
 
 
   Future<Request<T>> _request<T>(
   Future<Request<T>> _request<T>(
-    String url,
+    String? url,
     String method, {
     String method, {
-    String contentType,
-    @required dynamic body,
-    @required Map<String, dynamic> query,
-    Decoder<T> decoder,
-    @required Progress uploadProgress,
+    String? contentType,
+    required dynamic body,
+    required Map<String, dynamic>? query,
+    Decoder<T>? decoder,
+    required Progress? uploadProgress,
   }) {
   }) {
     return _requestWithBody<T>(
     return _requestWithBody<T>(
       url,
       url,
@@ -269,16 +269,16 @@ class GetHttpClient {
       body,
       body,
       method,
       method,
       query,
       query,
-      decoder ?? (defaultDecoder as Decoder<T>),
+      decoder ?? (defaultDecoder as Decoder<T>?),
       uploadProgress,
       uploadProgress,
     );
     );
   }
   }
 
 
   Request<T> _delete<T>(
   Request<T> _delete<T>(
     String url,
     String url,
-    String contentType,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
+    String? contentType,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
   ) {
   ) {
     final headers = <String, String>{};
     final headers = <String, String>{};
     _setSimpleHeaders(headers, contentType);
     _setSimpleHeaders(headers, contentType);
@@ -288,18 +288,18 @@ class GetHttpClient {
       method: 'delete',
       method: 'delete',
       url: uri,
       url: uri,
       headers: headers,
       headers: headers,
-      decoder: decoder ?? (defaultDecoder as Decoder<T>),
+      decoder: decoder ?? (defaultDecoder as Decoder<T>?),
     );
     );
   }
   }
 
 
   Future<Response<T>> patch<T>(
   Future<Response<T>> patch<T>(
     String url, {
     String url, {
     dynamic body,
     dynamic body,
-    String contentType,
-    Map<String, String> headers,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
-    Progress uploadProgress,
+    String? contentType,
+    Map<String, String>? headers,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
+    Progress? uploadProgress,
     // List<MultipartFile> files,
     // List<MultipartFile> files,
   }) async {
   }) async {
     try {
     try {
@@ -327,13 +327,13 @@ class GetHttpClient {
   }
   }
 
 
   Future<Response<T>> post<T>(
   Future<Response<T>> post<T>(
-    String url, {
+    String? url, {
     dynamic body,
     dynamic body,
-    String contentType,
-    Map<String, String> headers,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
-    Progress uploadProgress,
+    String? contentType,
+    Map<String, String>? headers,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
+    Progress? uploadProgress,
     // List<MultipartFile> files,
     // List<MultipartFile> files,
   }) async {
   }) async {
     try {
     try {
@@ -364,11 +364,11 @@ class GetHttpClient {
     String url,
     String url,
     String method, {
     String method, {
     dynamic body,
     dynamic body,
-    String contentType,
-    Map<String, String> headers,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
-    Progress uploadProgress,
+    String? contentType,
+    Map<String, String>? headers,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
+    Progress? uploadProgress,
   }) async {
   }) async {
     try {
     try {
       var response = await _performRequest<T>(
       var response = await _performRequest<T>(
@@ -397,11 +397,11 @@ class GetHttpClient {
   Future<Response<T>> put<T>(
   Future<Response<T>> put<T>(
     String url, {
     String url, {
     dynamic body,
     dynamic body,
-    String contentType,
-    Map<String, String> headers,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
-    Progress uploadProgress,
+    String? contentType,
+    Map<String, String>? headers,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
+    Progress? uploadProgress,
   }) async {
   }) async {
     try {
     try {
       var response = await _performRequest<T>(
       var response = await _performRequest<T>(
@@ -429,10 +429,10 @@ class GetHttpClient {
 
 
   Future<Response<T>> get<T>(
   Future<Response<T>> get<T>(
     String url, {
     String url, {
-    Map<String, String> headers,
-    String contentType,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
+    Map<String, String>? headers,
+    String? contentType,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
   }) async {
   }) async {
     try {
     try {
       var response = await _performRequest<T>(
       var response = await _performRequest<T>(
@@ -513,10 +513,10 @@ class GetHttpClient {
 
 
   Future<Response<T>> delete<T>(
   Future<Response<T>> delete<T>(
     String url, {
     String url, {
-    Map<String, String> headers,
-    String contentType,
-    Map<String, dynamic> query,
-    Decoder<T> decoder,
+    Map<String, String>? headers,
+    String? contentType,
+    Map<String, dynamic>? query,
+    Decoder<T>? decoder,
   }) async {
   }) async {
     try {
     try {
       var response = await _performRequest<T>(
       var response = await _performRequest<T>(

@@ -13,7 +13,7 @@ import '../utils/body_decoder.dart';
 class HttpRequestImpl implements HttpRequestBase {
 class HttpRequestImpl implements HttpRequestBase {
   HttpRequestImpl({
   HttpRequestImpl({
     bool allowAutoSignedCert = true,
     bool allowAutoSignedCert = true,
-    List<TrustedCertificate> trustedCertificates,
+    List<TrustedCertificate>? trustedCertificates,
   });
   });
 
 
   /// The currently active XHRs.
   /// The currently active XHRs.
@@ -41,16 +41,16 @@ class HttpRequestImpl implements HttpRequestBase {
 
 
     var completer = Completer<Response<T>>();
     var completer = Completer<Response<T>>();
     xhr.onLoad.first.then((_) {
     xhr.onLoad.first.then((_) {
-      var blob = xhr.response as html.Blob ?? html.Blob([]);
+      var blob = xhr.response as html.Blob? ?? html.Blob([]);
       var reader = html.FileReader();
       var reader = html.FileReader();
 
 
       reader.onLoad.first.then((_) async {
       reader.onLoad.first.then((_) async {
-        var bodyBytes = BodyBytesStream.fromBytes(reader.result as Uint8List);
+        var bodyBytes = BodyBytesStream.fromBytes(reader.result as Uint8List?);
 
 
         final stringBody =
         final stringBody =
             await bodyBytesToString(bodyBytes, xhr.responseHeaders);
             await bodyBytesToString(bodyBytes, xhr.responseHeaders);
 
 
-        String contentType;
+        String? contentType;
 
 
         if (xhr.responseHeaders.containsKey('content-type')) {
         if (xhr.responseHeaders.containsKey('content-type')) {
           contentType = xhr.responseHeaders['content-type'];
           contentType = xhr.responseHeaders['content-type'];

@@ -10,33 +10,33 @@ import '../utils/body_decoder.dart';
 
 
 /// A `dart:io` implementation of `HttpRequestBase`.
 /// A `dart:io` implementation of `HttpRequestBase`.
 class HttpRequestImpl extends HttpRequestBase {
 class HttpRequestImpl extends HttpRequestBase {
-  io.HttpClient _httpClient;
-  io.SecurityContext _securityContext;
+  io.HttpClient? _httpClient;
+  io.SecurityContext? _securityContext;
 
 
   HttpRequestImpl({
   HttpRequestImpl({
     bool allowAutoSignedCert = true,
     bool allowAutoSignedCert = true,
-    List<TrustedCertificate> trustedCertificates,
+    List<TrustedCertificate>? trustedCertificates,
   }) {
   }) {
     _httpClient = io.HttpClient();
     _httpClient = io.HttpClient();
     if (trustedCertificates != null) {
     if (trustedCertificates != null) {
       _securityContext = io.SecurityContext();
       _securityContext = io.SecurityContext();
       for (final trustedCertificate in trustedCertificates) {
       for (final trustedCertificate in trustedCertificates) {
-        _securityContext
+        _securityContext!
             .setTrustedCertificatesBytes(List.from(trustedCertificate.bytes));
             .setTrustedCertificatesBytes(List.from(trustedCertificate.bytes));
       }
       }
     }
     }
 
 
     _httpClient = io.HttpClient(context: _securityContext);
     _httpClient = io.HttpClient(context: _securityContext);
-    _httpClient.badCertificateCallback = (_, __, ___) => allowAutoSignedCert;
+    _httpClient!.badCertificateCallback = (_, __, ___) => allowAutoSignedCert;
   }
   }
 
 
   @override
   @override
   Future<Response<T>> send<T>(Request<T> request) async {
   Future<Response<T>> send<T>(Request<T> request) async {
-    var stream = request.bodyBytes.asBroadcastStream();
+    Stream<List<int>?> stream = request.bodyBytes.asBroadcastStream();
     //var stream = BodyBytesStream.fromBytes(requestBody ?? const []);
     //var stream = BodyBytesStream.fromBytes(requestBody ?? const []);
 
 
     try {
     try {
-      var ioRequest = (await _httpClient.openUrl(request.method, request.url))
+      var ioRequest = (await _httpClient!.openUrl(request.method, request.url))
         ..followRedirects = request.followRedirects
         ..followRedirects = request.followRedirects
         ..persistentConnection = request.persistentConnection
         ..persistentConnection = request.persistentConnection
         ..maxRedirects = request.maxRedirects
         ..maxRedirects = request.maxRedirects
@@ -77,7 +77,7 @@ class HttpRequestImpl extends HttpRequestBase {
   @override
   @override
   void close() {
   void close() {
     if (_httpClient != null) {
     if (_httpClient != null) {
-      _httpClient.close(force: true);
+      _httpClient!.close(force: true);
       _httpClient = null;
       _httpClient = null;
     }
     }
   }
   }

@@ -20,10 +20,10 @@ class MockClient extends HttpRequestBase {
 
 
     var response = await _handler(request);
     var response = await _handler(request);
 
 
-    final stringBody = await bodyBytesToString(bodyBytes, response.headers);
+    final stringBody = await bodyBytesToString(bodyBytes, response.headers!);
 
 
-    var mimeType = response.headers.containsKey('content-type')
-        ? response.headers['content-type']
+    var mimeType = response.headers!.containsKey('content-type')
+        ? response.headers!['content-type']
         : '';
         : '';
 
 
     final body = bodyDecoded<T>(
     final body = bodyDecoded<T>(

@@ -6,7 +6,7 @@ import '../interface/request_base.dart';
 class HttpRequestImpl extends HttpRequestBase {
 class HttpRequestImpl extends HttpRequestBase {
   HttpRequestImpl({
   HttpRequestImpl({
     bool allowAutoSignedCert = true,
     bool allowAutoSignedCert = true,
-    List<TrustedCertificate> trustedCertificates,
+    List<TrustedCertificate>? trustedCertificates,
   });
   });
   @override
   @override
   void close() {}
   void close() {}

@@ -4,8 +4,8 @@ import '../../../../../get_core/get_core.dart';
 
 
 import '../../request/request.dart';
 import '../../request/request.dart';
 
 
-T bodyDecoded<T>(Request<T> request, String stringBody, String mimeType) {
-  T body;
+T? bodyDecoded<T>(Request<T> request, String stringBody, String? mimeType) {
+  T? body;
   var bodyToDecode;
   var bodyToDecode;
 
 
   if (mimeType != null && mimeType.contains('application/json')) {
   if (mimeType != null && mimeType.contains('application/json')) {
@@ -23,9 +23,9 @@ T bodyDecoded<T>(Request<T> request, String stringBody, String mimeType) {
     if (stringBody == '') {
     if (stringBody == '') {
       body = null;
       body = null;
     } else if (request.decoder == null) {
     } else if (request.decoder == null) {
-      body = bodyToDecode as T;
+      body = bodyToDecode as T?;
     } else {
     } else {
-      body = request.decoder(bodyToDecode);
+      body = request.decoder!(bodyToDecode);
     }
     }
   } on Exception catch (_) {
   } on Exception catch (_) {
     body = stringBody as T;
     body = stringBody as T;

@@ -3,17 +3,17 @@ import 'dart:async';
 import '../request/request.dart';
 import '../request/request.dart';
 import '../response/response.dart';
 import '../response/response.dart';
 
 
-typedef RequestModifier<T> = FutureOr<Request<T>> Function(Request<T> request);
+typedef RequestModifier<T> = FutureOr<Request<T>> Function(Request<T?> request);
 
 
 typedef ResponseModifier<T> = FutureOr Function(
 typedef ResponseModifier<T> = FutureOr Function(
-    Request<T> request, Response<T> response);
+    Request<T?> request, Response<T?> response);
 
 
 typedef HandlerExecute<T> = Future<Request<T>> Function();
 typedef HandlerExecute<T> = Future<Request<T>> Function();
 
 
 class GetModifier<T> {
 class GetModifier<T> {
   final _requestModifiers = <RequestModifier>[];
   final _requestModifiers = <RequestModifier>[];
   final _responseModifiers = <ResponseModifier>[];
   final _responseModifiers = <ResponseModifier>[];
-  RequestModifier authenticator;
+  RequestModifier? authenticator;
 
 
   void addRequestModifier<T>(RequestModifier<T> interceptor) {
   void addRequestModifier<T>(RequestModifier<T> interceptor) {
     _requestModifiers.add(interceptor as RequestModifier);
     _requestModifiers.add(interceptor as RequestModifier);

@@ -83,7 +83,7 @@ class FormData {
           _maxBoundaryLength +
           _maxBoundaryLength +
           '\r\n'.length +
           '\r\n'.length +
           utf8.encode(_fileHeader(file)).length +
           utf8.encode(_fileHeader(file)).length +
-          file.value.length +
+          file.value.length! +
           '\r\n'.length;
           '\r\n'.length;
     }
     }
 
 
@@ -109,7 +109,7 @@ class FormData {
     for (final file in files) {
     for (final file in files) {
       yield separator;
       yield separator;
       yield utf8.encode(_fileHeader(file));
       yield utf8.encode(_fileHeader(file));
-      yield* file.value.stream;
+      yield* file.value.stream! as Stream<List<int>>;
       yield line;
       yield line;
     }
     }
     yield close;
     yield close;

@@ -9,7 +9,7 @@ import '../request/request.dart';
 class MultipartFile {
 class MultipartFile {
   MultipartFile(
   MultipartFile(
     dynamic data, {
     dynamic data, {
-    @required this.filename,
+    required this.filename,
     this.contentType = 'application/octet-stream',
     this.contentType = 'application/octet-stream',
   }) : _bytes = fileToBytes(data) {
   }) : _bytes = fileToBytes(data) {
     _length = _bytes.length;
     _length = _bytes.length;
@@ -21,13 +21,13 @@ class MultipartFile {
   final String contentType;
   final String contentType;
 
 
   /// This stream will emit the file content of File.
   /// This stream will emit the file content of File.
-  BodyBytesStream _stream;
+  BodyBytesStream? _stream;
 
 
-  int _length;
+  int? _length;
 
 
-  BodyBytesStream get stream => _stream;
+  BodyBytesStream? get stream => _stream;
 
 
-  int get length => _length;
+  int? get length => _length;
 
 
   final String filename;
   final String filename;
 }
 }

@@ -2,8 +2,6 @@ import 'dart:async';
 import 'dart:convert';
 import 'dart:convert';
 import 'dart:typed_data';
 import 'dart:typed_data';
 
 
-import 'package:flutter/foundation.dart';
-
 import '../http.dart';
 import '../http.dart';
 import '../multipart/form_data.dart';
 import '../multipart/form_data.dart';
 
 
@@ -14,13 +12,13 @@ class Request<T> {
   /// The [Uri] from request
   /// The [Uri] from request
   final Uri url;
   final Uri url;
 
 
-  final Decoder<T> decoder;
+  final Decoder<T>? decoder;
 
 
   /// The Http Method from this [Request]
   /// The Http Method from this [Request]
   /// ex: `GET`,`POST`,`PUT`,`DELETE`
   /// ex: `GET`,`POST`,`PUT`,`DELETE`
   final String method;
   final String method;
 
 
-  final int contentLength;
+  final int? contentLength;
 
 
   /// The BodyBytesStream of body from this [Request]
   /// The BodyBytesStream of body from this [Request]
   final BodyBytesStream bodyBytes;
   final BodyBytesStream bodyBytes;
@@ -33,45 +31,41 @@ class Request<T> {
 
 
   final bool persistentConnection;
   final bool persistentConnection;
 
 
-  final FormData files;
+  final FormData? files;
 
 
   const Request._({
   const Request._({
-    @required this.method,
-    @required this.bodyBytes,
-    @required this.url,
-    @required this.headers,
-    @required this.contentLength,
-    @required this.followRedirects,
-    @required this.maxRedirects,
-    @required this.files,
-    @required this.persistentConnection,
-    @required this.decoder,
+    required this.method,
+    required this.bodyBytes,
+    required this.url,
+    required this.headers,
+    required this.contentLength,
+    required this.followRedirects,
+    required this.maxRedirects,
+    required this.files,
+    required this.persistentConnection,
+    required this.decoder,
   });
   });
 
 
   factory Request({
   factory Request({
-    @required Uri url,
-    @required String method,
-    @required Map<String, String> headers,
-    BodyBytesStream bodyBytes,
+    required Uri url,
+    required String method,
+    required Map<String, String> headers,
+    BodyBytesStream? bodyBytes,
     bool followRedirects = true,
     bool followRedirects = true,
     int maxRedirects = 4,
     int maxRedirects = 4,
-    int contentLength,
-    FormData files,
+    int? contentLength,
+    FormData? files,
     bool persistentConnection = true,
     bool persistentConnection = true,
-    Decoder<T> decoder,
+    Decoder<T>? decoder,
   }) {
   }) {
-    assert(url != null);
-    assert(method != null);
-    assert(followRedirects != null);
     if (followRedirects) {
     if (followRedirects) {
-      assert(maxRedirects != null);
       assert(maxRedirects > 0);
       assert(maxRedirects > 0);
     }
     }
     return Request._(
     return Request._(
       url: url,
       url: url,
       method: method,
       method: method,
       bodyBytes: bodyBytes ??= BodyBytesStream.fromBytes(const []),
       bodyBytes: bodyBytes ??= BodyBytesStream.fromBytes(const []),
-      headers: Map.from(headers ??= <String, String>{}),
+      headers: Map.from(headers),
       followRedirects: followRedirects,
       followRedirects: followRedirects,
       maxRedirects: maxRedirects,
       maxRedirects: maxRedirects,
       contentLength: contentLength,
       contentLength: contentLength,
@@ -82,10 +76,10 @@ class Request<T> {
   }
   }
 }
 }
 
 
-class BodyBytesStream extends StreamView<List<int>> {
-  BodyBytesStream(Stream<List<int>> stream) : super(stream);
+class BodyBytesStream extends StreamView<List<int>?> {
+  BodyBytesStream(Stream<List<int>?> stream) : super(stream);
 
 
-  factory BodyBytesStream.fromBytes(List<int> bytes) =>
+  factory BodyBytesStream.fromBytes(List<int>? bytes) =>
       BodyBytesStream(Stream.fromIterable([bytes]));
       BodyBytesStream(Stream.fromIterable([bytes]));
 
 
   Future<Uint8List> toBytes() {
   Future<Uint8List> toBytes() {
@@ -95,7 +89,7 @@ class BodyBytesStream extends StreamView<List<int>> {
         Uint8List.fromList(bytes),
         Uint8List.fromList(bytes),
       ),
       ),
     );
     );
-    listen(sink.add,
+    listen((val) => sink.add(val!),
         onError: completer.completeError,
         onError: completer.completeError,
         onDone: sink.close,
         onDone: sink.close,
         cancelOnError: true);
         cancelOnError: true);
@@ -103,5 +97,5 @@ class BodyBytesStream extends StreamView<List<int>> {
   }
   }
 
 
   Future<String> bytesToString([Encoding encoding = utf8]) =>
   Future<String> bytesToString([Encoding encoding = utf8]) =>
-      encoding.decodeStream(this);
+      encoding.decodeStream(this as Stream<List<int>>);
 }
 }

@@ -5,8 +5,8 @@ import '../request/request.dart';
 import '../status/http_status.dart';
 import '../status/http_status.dart';
 
 
 class GraphQLResponse<T> extends Response<T> {
 class GraphQLResponse<T> extends Response<T> {
-  final List<GraphQLError> graphQLErrors;
-  GraphQLResponse({T body, this.graphQLErrors}) : super(body: body);
+  final List<GraphQLError>? graphQLErrors;
+  GraphQLResponse({T? body, this.graphQLErrors}) : super(body: body);
 }
 }
 
 
 class Response<T> {
 class Response<T> {
@@ -21,16 +21,16 @@ class Response<T> {
   });
   });
 
 
   /// The Http [Request] linked with this [Response].
   /// The Http [Request] linked with this [Response].
-  final Request request;
+  final Request? request;
 
 
   /// The response headers.
   /// The response headers.
-  final Map<String, String> headers;
+  final Map<String, String>? headers;
 
 
   /// The status code returned by the server.
   /// The status code returned by the server.
-  final int statusCode;
+  final int? statusCode;
 
 
   /// Human-readable context for [statusCode].
   /// Human-readable context for [statusCode].
-  final String statusText;
+  final String? statusText;
 
 
   /// [HttpStatus] from [Response]. `status.connectionError` is true
   /// [HttpStatus] from [Response]. `status.connectionError` is true
   /// when statusCode is null. `status.isUnauthorized` is true when
   /// when statusCode is null. `status.isUnauthorized` is true when
@@ -49,15 +49,15 @@ class Response<T> {
   bool get unauthorized => status.isUnauthorized;
   bool get unauthorized => status.isUnauthorized;
 
 
   /// The response body as a Stream of Bytes.
   /// The response body as a Stream of Bytes.
-  final BodyBytesStream bodyBytes;
+  final BodyBytesStream? bodyBytes;
 
 
   /// The response body as a Stream of Bytes.
   /// The response body as a Stream of Bytes.
-  final String bodyString;
+  final String? bodyString;
 
 
   /// The decoded body of this [Response]. You can access the
   /// The decoded body of this [Response]. You can access the
   /// body parameters as Map
   /// body parameters as Map
   /// Ex: body['title'];
   /// Ex: body['title'];
-  final T body;
+  final T? body;
 }
 }
 
 
 Future<String> bodyBytesToString(
 Future<String> bodyBytesToString(
@@ -70,13 +70,13 @@ Future<String> bodyBytesToString(
 /// Defaults to [latin1] if the headers don't specify a charset or if that
 /// Defaults to [latin1] if the headers don't specify a charset or if that
 /// charset is unknown.
 /// charset is unknown.
 Encoding _encodingForHeaders(Map<String, String> headers) =>
 Encoding _encodingForHeaders(Map<String, String> headers) =>
-    _encodingForCharset(_contentTypeForHeaders(headers).parameters['charset']);
+    _encodingForCharset(_contentTypeForHeaders(headers).parameters!['charset']);
 
 
 /// Returns the [Encoding] that corresponds to [charset].
 /// Returns the [Encoding] that corresponds to [charset].
 ///
 ///
 /// Returns [fallback] if [charset] is null or if no [Encoding] was found that
 /// Returns [fallback] if [charset] is null or if no [Encoding] was found that
 /// corresponds to [charset].
 /// corresponds to [charset].
-Encoding _encodingForCharset(String charset, [Encoding fallback = latin1]) {
+Encoding _encodingForCharset(String? charset, [Encoding fallback = latin1]) {
   if (charset == null) return fallback;
   if (charset == null) return fallback;
   return Encoding.getByName(charset) ?? fallback;
   return Encoding.getByName(charset) ?? fallback;
 }
 }
@@ -92,10 +92,10 @@ HeaderValue _contentTypeForHeaders(Map<String, String> headers) {
 
 
 class HeaderValue {
 class HeaderValue {
   String _value;
   String _value;
-  Map<String, String> _parameters;
-  Map<String, String> _unmodifiableParameters;
+  Map<String, String?>? _parameters;
+  Map<String, String?>? _unmodifiableParameters;
 
 
-  HeaderValue([this._value = '', Map<String, String> parameters]) {
+  HeaderValue([this._value = '', Map<String, String>? parameters]) {
     if (parameters != null) {
     if (parameters != null) {
       _parameters = HashMap<String, String>.from(parameters);
       _parameters = HashMap<String, String>.from(parameters);
     }
     }
@@ -103,7 +103,7 @@ class HeaderValue {
 
 
   static HeaderValue parse(String value,
   static HeaderValue parse(String value,
       {String parameterSeparator = ';',
       {String parameterSeparator = ';',
-      String valueSeparator,
+      String? valueSeparator,
       bool preserveBackslash = false}) {
       bool preserveBackslash = false}) {
     var result = HeaderValue();
     var result = HeaderValue();
     result._parse(value, parameterSeparator, valueSeparator, preserveBackslash);
     result._parse(value, parameterSeparator, valueSeparator, preserveBackslash);
@@ -116,9 +116,9 @@ class HeaderValue {
     _parameters ??= HashMap<String, String>();
     _parameters ??= HashMap<String, String>();
   }
   }
 
 
-  Map<String, String> get parameters {
+  Map<String, String?>? get parameters {
     _ensureParameters();
     _ensureParameters();
-    _unmodifiableParameters ??= UnmodifiableMapView(_parameters);
+    _unmodifiableParameters ??= UnmodifiableMapView(_parameters!);
     return _unmodifiableParameters;
     return _unmodifiableParameters;
   }
   }
 
 
@@ -126,15 +126,15 @@ class HeaderValue {
   String toString() {
   String toString() {
     var stringBuffer = StringBuffer();
     var stringBuffer = StringBuffer();
     stringBuffer.write(_value);
     stringBuffer.write(_value);
-    if (parameters != null && parameters.isNotEmpty) {
-      _parameters.forEach((name, value) {
+    if (parameters != null && parameters!.isNotEmpty) {
+      _parameters!.forEach((name, value) {
         stringBuffer..write('; ')..write(name)..write('=')..write(value);
         stringBuffer..write('; ')..write(name)..write('=')..write(value);
       });
       });
     }
     }
     return stringBuffer.toString();
     return stringBuffer.toString();
   }
   }
 
 
-  void _parse(String value, String parameterSeparator, String valueSeparator,
+  void _parse(String value, String parameterSeparator, String? valueSeparator,
       bool preserveBackslash) {
       bool preserveBackslash) {
     var index = 0;
     var index = 0;
 
 
@@ -173,7 +173,7 @@ class HeaderValue {
     }
     }
 
 
     void parseParameters() {
     void parseParameters() {
-      var parameters = HashMap<String, String>();
+      var parameters = HashMap<String, String?>();
       _parameters = UnmodifiableMapView(parameters);
       _parameters = UnmodifiableMapView(parameters);
 
 
       String parseParameterName() {
       String parseParameterName() {
@@ -191,7 +191,7 @@ class HeaderValue {
         return value.substring(start, index).toLowerCase();
         return value.substring(start, index).toLowerCase();
       }
       }
 
 
-      String parseParameterValue() {
+      String? parseParameterValue() {
         if (!done() && value[index] == '\"') {
         if (!done() && value[index] == '\"') {
           var stringBuffer = StringBuffer();
           var stringBuffer = StringBuffer();
           index++;
           index++;

 class HttpStatus {
 class HttpStatus {
   HttpStatus(this.code);
   HttpStatus(this.code);
 
 
-  final int code;
+  final int? code;
 
 
   static const int continue_ = 100;
   static const int continue_ = 100;
   static const int switchingProtocols = 101;
   static const int switchingProtocols = 101;
@@ -83,7 +83,7 @@ class HttpStatus {
       between(internalServerError, networkConnectTimeoutError);
       between(internalServerError, networkConnectTimeoutError);
 
 
   bool between(int begin, int end) {
   bool between(int begin, int end) {
-    return !connectionError && code >= begin && code <= end;
+    return !connectionError && code! >= begin && code! <= end;
   }
   }
 
 
   bool get isOk => between(200, 299);
   bool get isOk => between(200, 299);

@@ -53,7 +53,7 @@ String validateField(String field) {
 }
 }
 
 
 BodyBytesStream toBodyBytesStream(Stream<List<int>> stream) {
 BodyBytesStream toBodyBytesStream(Stream<List<int>> stream) {
-  if (stream is BodyBytesStream) return stream;
+  if (stream is BodyBytesStream) return stream as BodyBytesStream;
   return BodyBytesStream(stream);
   return BodyBytesStream(stream);
 }
 }
 
 

@@ -3,7 +3,7 @@ import 'src/sockets_stub.dart'
     if (dart.library.io) 'src/sockets_io.dart';
     if (dart.library.io) 'src/sockets_io.dart';
 
 
 class GetSocket extends BaseWebSocket {
 class GetSocket extends BaseWebSocket {
-  GetSocket(String url,
+  GetSocket(String? url,
       {Duration ping = const Duration(seconds: 5), bool allowSelfSigned = true})
       {Duration ping = const Duration(seconds: 5), bool allowSelfSigned = true})
       : super(url, ping: ping, allowSelfSigned: allowSelfSigned);
       : super(url, ping: ping, allowSelfSigned: allowSelfSigned);
 }
 }

 import 'dart:convert';
 import 'dart:convert';
 
 
 class Close {
 class Close {
-  final String message;
-  final int reason;
+  final String? message;
+  final int? reason;
 
 
   Close(this.message, this.reason);
   Close(this.message, this.reason);
 
 
@@ -19,31 +19,31 @@ typedef CloseSocket = void Function(Close);
 typedef MessageSocket = void Function(dynamic val);
 typedef MessageSocket = void Function(dynamic val);
 
 
 class SocketNotifier {
 class SocketNotifier {
-  var _onMessages = <MessageSocket>[];
-  var _onEvents = <String, MessageSocket>{};
-  var _onCloses = <CloseSocket>[];
-  var _onErrors = <CloseSocket>[];
+  List<void Function(dynamic)>? _onMessages = <MessageSocket>[];
+  Map<String, void Function(dynamic)>? _onEvents = <String, MessageSocket>{};
+  List<void Function(Close)>? _onCloses = <CloseSocket>[];
+  List<void Function(Close)>? _onErrors = <CloseSocket>[];
 
 
-  OpenSocket open;
+  late OpenSocket open;
 
 
   void addMessages(MessageSocket socket) {
   void addMessages(MessageSocket socket) {
-    _onMessages.add((socket));
+    _onMessages!.add((socket));
   }
   }
 
 
   void addEvents(String event, MessageSocket socket) {
   void addEvents(String event, MessageSocket socket) {
-    _onEvents[event] = socket;
+    _onEvents![event] = socket;
   }
   }
 
 
   void addCloses(CloseSocket socket) {
   void addCloses(CloseSocket socket) {
-    _onCloses.add(socket);
+    _onCloses!.add(socket);
   }
   }
 
 
   void addErrors(CloseSocket socket) {
   void addErrors(CloseSocket socket) {
-    _onErrors.add((socket));
+    _onErrors!.add((socket));
   }
   }
 
 
   void notifyData(dynamic data) {
   void notifyData(dynamic data) {
-    for (var item in _onMessages) {
+    for (var item in _onMessages!) {
       item(data);
       item(data);
     }
     }
     if (data is String) {
     if (data is String) {
@@ -52,14 +52,14 @@ class SocketNotifier {
   }
   }
 
 
   void notifyClose(Close err) {
   void notifyClose(Close err) {
-    for (var item in _onCloses) {
+    for (var item in _onCloses!) {
       item(err);
       item(err);
     }
     }
   }
   }
 
 
   void notifyError(Close err) {
   void notifyError(Close err) {
     // rooms.removeWhere((key, value) => value.contains(_ws));
     // rooms.removeWhere((key, value) => value.contains(_ws));
-    for (var item in _onErrors) {
+    for (var item in _onErrors!) {
       item(err);
       item(err);
     }
     }
   }
   }
@@ -69,8 +69,8 @@ class SocketNotifier {
       var msg = jsonDecode(message);
       var msg = jsonDecode(message);
       final event = msg['type'];
       final event = msg['type'];
       final data = msg['data'];
       final data = msg['data'];
-      if (_onEvents.containsKey(event)) {
-        _onEvents[event](data);
+      if (_onEvents!.containsKey(event)) {
+        _onEvents![event]!(data);
       }
       }
     } on Exception catch (_) {
     } on Exception catch (_) {
       return;
       return;

@@ -15,8 +15,8 @@ enum ConnectionStatus {
 
 
 class BaseWebSocket {
 class BaseWebSocket {
   String url;
   String url;
-  WebSocket socket;
-  SocketNotifier socketNotifier = SocketNotifier();
+  WebSocket? socket;
+  SocketNotifier? socketNotifier = SocketNotifier();
   Duration ping;
   Duration ping;
   bool isDisposed = false;
   bool isDisposed = false;
   bool allowSelfSigned;
   bool allowSelfSigned;
@@ -30,39 +30,39 @@ class BaseWebSocket {
         ? url.replaceAll('https:', 'wss:')
         ? url.replaceAll('https:', 'wss:')
         : url.replaceAll('http:', 'ws:');
         : url.replaceAll('http:', 'ws:');
   }
   }
-  ConnectionStatus connectionStatus;
-  Timer _t;
+  ConnectionStatus? connectionStatus;
+  Timer? _t;
 
 
   void connect() {
   void connect() {
     try {
     try {
       connectionStatus = ConnectionStatus.connecting;
       connectionStatus = ConnectionStatus.connecting;
       socket = WebSocket(url);
       socket = WebSocket(url);
-      socket.onOpen.listen((e) {
+      socket!.onOpen.listen((e) {
         socketNotifier?.open();
         socketNotifier?.open();
         _t = Timer?.periodic(ping, (t) {
         _t = Timer?.periodic(ping, (t) {
-          socket.send('');
+          socket!.send('');
         });
         });
         connectionStatus = ConnectionStatus.connected;
         connectionStatus = ConnectionStatus.connected;
       });
       });
 
 
-      socket.onMessage.listen((event) {
-        socketNotifier.notifyData(event.data);
+      socket!.onMessage.listen((event) {
+        socketNotifier!.notifyData(event.data);
       });
       });
 
 
-      socket.onClose.listen((e) {
+      socket!.onClose.listen((e) {
         _t?.cancel();
         _t?.cancel();
 
 
         connectionStatus = ConnectionStatus.closed;
         connectionStatus = ConnectionStatus.closed;
-        socketNotifier.notifyClose(Close(e.reason, e.code));
+        socketNotifier!.notifyClose(Close(e.reason, e.code));
       });
       });
-      socket.onError.listen((event) {
+      socket!.onError.listen((event) {
         _t?.cancel();
         _t?.cancel();
-        socketNotifier.notifyError(Close(event.toString(), 0));
+        socketNotifier!.notifyError(Close(event.toString(), 0));
         connectionStatus = ConnectionStatus.closed;
         connectionStatus = ConnectionStatus.closed;
       });
       });
     } on Exception catch (e) {
     } on Exception catch (e) {
       _t?.cancel();
       _t?.cancel();
-      socketNotifier.notifyError(Close(e.toString(), 500));
+      socketNotifier!.notifyError(Close(e.toString(), 500));
       connectionStatus = ConnectionStatus.closed;
       connectionStatus = ConnectionStatus.closed;
       //  close(500, e.toString());
       //  close(500, e.toString());
     }
     }
@@ -70,35 +70,35 @@ class BaseWebSocket {
 
 
   // ignore: use_setters_to_change_properties
   // ignore: use_setters_to_change_properties
   void onOpen(OpenSocket fn) {
   void onOpen(OpenSocket fn) {
-    socketNotifier.open = fn;
+    socketNotifier!.open = fn;
   }
   }
 
 
   void onClose(CloseSocket fn) {
   void onClose(CloseSocket fn) {
-    socketNotifier.addCloses(fn);
+    socketNotifier!.addCloses(fn);
   }
   }
 
 
   void onError(CloseSocket fn) {
   void onError(CloseSocket fn) {
-    socketNotifier.addErrors(fn);
+    socketNotifier!.addErrors(fn);
   }
   }
 
 
   void onMessage(MessageSocket fn) {
   void onMessage(MessageSocket fn) {
-    socketNotifier.addMessages(fn);
+    socketNotifier!.addMessages(fn);
   }
   }
 
 
   void on(String event, MessageSocket message) {
   void on(String event, MessageSocket message) {
-    socketNotifier.addEvents(event, message);
+    socketNotifier!.addEvents(event, message);
   }
   }
 
 
-  void close([int status, String reason]) {
-    if (socket != null) socket.close(status, reason);
+  void close([int? status, String? reason]) {
+    if (socket != null) socket!.close(status, reason);
   }
   }
 
 
   void send(dynamic data) {
   void send(dynamic data) {
     if (connectionStatus == ConnectionStatus.closed) {
     if (connectionStatus == ConnectionStatus.closed) {
       connect();
       connect();
     }
     }
-    if (socket != null && socket.readyState == WebSocket.OPEN) {
-      socket.send(data);
+    if (socket != null && socket!.readyState == WebSocket.OPEN) {
+      socket!.send(data);
     } else {
     } else {
       Get.log('WebSocket not connected, message $data not sent');
       Get.log('WebSocket not connected, message $data not sent');
     }
     }
@@ -109,7 +109,7 @@ class BaseWebSocket {
   }
   }
 
 
   void dispose() {
   void dispose() {
-    socketNotifier.dispose();
+    socketNotifier!.dispose();
     socketNotifier = null;
     socketNotifier = null;
     isDisposed = true;
     isDisposed = true;
   }
   }

@@ -15,8 +15,8 @@ enum ConnectionStatus {
 
 
 class BaseWebSocket {
 class BaseWebSocket {
   String url;
   String url;
-  WebSocket socket;
-  SocketNotifier socketNotifier = SocketNotifier();
+  WebSocket? socket;
+  SocketNotifier? socketNotifier = SocketNotifier();
   bool isDisposed = false;
   bool isDisposed = false;
   BaseWebSocket(
   BaseWebSocket(
     this.url, {
     this.url, {
@@ -26,7 +26,7 @@ class BaseWebSocket {
   Duration ping;
   Duration ping;
   bool allowSelfSigned;
   bool allowSelfSigned;
 
 
-  ConnectionStatus connectionStatus;
+  ConnectionStatus? connectionStatus;
 
 
   Future connect() async {
   Future connect() async {
     if (isDisposed) {
     if (isDisposed) {
@@ -38,51 +38,51 @@ class BaseWebSocket {
           ? await _connectForSelfSignedCert(url)
           ? await _connectForSelfSignedCert(url)
           : await WebSocket.connect(url);
           : await WebSocket.connect(url);
 
 
-      socket.pingInterval = ping;
+      socket!.pingInterval = ping;
       socketNotifier?.open();
       socketNotifier?.open();
       connectionStatus = ConnectionStatus.connected;
       connectionStatus = ConnectionStatus.connected;
 
 
-      socket.listen((data) {
-        socketNotifier.notifyData(data);
+      socket!.listen((data) {
+        socketNotifier!.notifyData(data);
       }, onError: (err) {
       }, onError: (err) {
-        socketNotifier.notifyError(Close(err.toString(), 1005));
+        socketNotifier!.notifyError(Close(err.toString(), 1005));
       }, onDone: () {
       }, onDone: () {
         connectionStatus = ConnectionStatus.closed;
         connectionStatus = ConnectionStatus.closed;
-        socketNotifier
-            .notifyClose(Close('Connection Closed', socket.closeCode));
+        socketNotifier!
+            .notifyClose(Close('Connection Closed', socket!.closeCode));
       }, cancelOnError: true);
       }, cancelOnError: true);
       return;
       return;
     } on SocketException catch (e) {
     } on SocketException catch (e) {
       connectionStatus = ConnectionStatus.closed;
       connectionStatus = ConnectionStatus.closed;
-      socketNotifier.notifyError(Close(e.osError.message, e.osError.errorCode));
+      socketNotifier!.notifyError(Close(e.osError!.message, e.osError!.errorCode));
       return;
       return;
     }
     }
   }
   }
 
 
   // ignore: use_setters_to_change_properties
   // ignore: use_setters_to_change_properties
   void onOpen(OpenSocket fn) {
   void onOpen(OpenSocket fn) {
-    socketNotifier.open = fn;
+    socketNotifier!.open = fn;
   }
   }
 
 
   void onClose(CloseSocket fn) {
   void onClose(CloseSocket fn) {
-    socketNotifier.addCloses(fn);
+    socketNotifier!.addCloses(fn);
   }
   }
 
 
   void onError(CloseSocket fn) {
   void onError(CloseSocket fn) {
-    socketNotifier.addErrors(fn);
+    socketNotifier!.addErrors(fn);
   }
   }
 
 
   void onMessage(MessageSocket fn) {
   void onMessage(MessageSocket fn) {
-    socketNotifier.addMessages(fn);
+    socketNotifier!.addMessages(fn);
   }
   }
 
 
   void on(String event, MessageSocket message) {
   void on(String event, MessageSocket message) {
-    socketNotifier.addEvents(event, message);
+    socketNotifier!.addEvents(event, message);
   }
   }
 
 
-  void close([int status, String reason]) {
+  void close([int? status, String? reason]) {
     if (socket != null) {
     if (socket != null) {
-      socket.close(status, reason);
+      socket!.close(status, reason);
     }
     }
   }
   }
 
 
@@ -92,12 +92,12 @@ class BaseWebSocket {
     }
     }
 
 
     if (socket != null) {
     if (socket != null) {
-      socket.add(data);
+      socket!.add(data);
     }
     }
   }
   }
 
 
   void dispose() {
   void dispose() {
-    socketNotifier.dispose();
+    socketNotifier!.dispose();
     socketNotifier = null;
     socketNotifier = null;
     isDisposed = true;
     isDisposed = true;
   }
   }

 import './socket_notifier.dart';
 import './socket_notifier.dart';
 
 
 class BaseWebSocket {
 class BaseWebSocket {
-  String url;
+  String? url;
   Duration ping;
   Duration ping;
   bool allowSelfSigned;
   bool allowSelfSigned;
   BaseWebSocket(
   BaseWebSocket(
@@ -36,7 +36,7 @@ class BaseWebSocket {
     throw 'To use sockets you need dart:io or dart:html';
     throw 'To use sockets you need dart:io or dart:html';
   }
   }
 
 
-  void close([int status, String reason]) {
+  void close([int? status, String? reason]) {
     throw 'To use sockets you need dart:io or dart:html';
     throw 'To use sockets you need dart:io or dart:html';
   }
   }
 
 

@@ -5,7 +5,7 @@ import 'smart_management.dart';
 /// class through extensions
 /// class through extensions
 abstract class GetInterface {
 abstract class GetInterface {
   SmartManagement smartManagement = SmartManagement.full;
   SmartManagement smartManagement = SmartManagement.full;
-  String reference;
+  String? reference;
   bool isLogEnable = true;
   bool isLogEnable = true;
   LogWriterCallback log = defaultLogWriterCallback;
   LogWriterCallback log = defaultLogWriterCallback;
 }
 }

@@ -2,9 +2,9 @@ import 'dart:developer' as developer;
 import 'get_main.dart';
 import 'get_main.dart';
 
 
 ///Voidcallback from logs
 ///Voidcallback from logs
-typedef LogWriterCallback = void Function(String text, {bool isError});
+typedef LogWriterCallback = void Function(String text, {bool? isError});
 
 
 /// default logger from GetX
 /// default logger from GetX
-void defaultLogWriterCallback(String value, {bool isError = false}) {
-  if (isError || Get.isLogEnable) developer.log(value, name: 'GETX');
+void defaultLogWriterCallback(String value, {bool? isError = false}) {
+  if (isError! || Get.isLogEnable) developer.log(value, name: 'GETX');
 }
 }

@@ -42,7 +42,7 @@ class BindingsBuilder<T> extends Bindings {
   /// ),
   /// ),
   /// ```
   /// ```
   factory BindingsBuilder.put(InstanceBuilderCallback<T> builder,
   factory BindingsBuilder.put(InstanceBuilderCallback<T> builder,
-      {String tag, bool permanent = false}) {
+      {String? tag, bool permanent = false}) {
     return BindingsBuilder(
     return BindingsBuilder(
         () => GetInstance().put<T>(builder(), tag: tag, permanent: permanent));
         () => GetInstance().put<T>(builder(), tag: tag, permanent: permanent));
   }
   }

@@ -28,7 +28,7 @@ extension Inst on GetInterface {
   /// Subsequent calls to [Get.lazyPut()] with the same parameters
   /// Subsequent calls to [Get.lazyPut()] with the same parameters
   /// (<[S]> and optionally [tag] will **not** override the original).
   /// (<[S]> and optionally [tag] will **not** override the original).
   void lazyPut<S>(InstanceBuilderCallback<S> builder,
   void lazyPut<S>(InstanceBuilderCallback<S> builder,
-      {String tag, bool fenix = false}) {
+      {String? tag, bool fenix = false}) {
     GetInstance().lazyPut<S>(builder, tag: tag, fenix: fenix);
     GetInstance().lazyPut<S>(builder, tag: tag, fenix: fenix);
   }
   }
 
 
@@ -39,8 +39,8 @@ extension Inst on GetInterface {
   /// async version of [Get.put()].
   /// async version of [Get.put()].
   /// Awaits for the resolution of the Future from [builder()] parameter and
   /// Awaits for the resolution of the Future from [builder()] parameter and
   /// stores the Instance returned.
   /// stores the Instance returned.
-  Future<S> putAsync<S>(AsyncInstanceBuilderCallback<S> builder,
-          {String tag, bool permanent = false}) async =>
+  Future<S?> putAsync<S>(AsyncInstanceBuilderCallback<S> builder,
+          {String? tag, bool permanent = false}) async =>
       GetInstance().putAsync<S>(builder, tag: tag, permanent: permanent);
       GetInstance().putAsync<S>(builder, tag: tag, permanent: permanent);
 
 
   /// Creates a new Class Instance [S] from the builder callback[S].
   /// Creates a new Class Instance [S] from the builder callback[S].
@@ -61,13 +61,13 @@ extension Inst on GetInterface {
   /// Repl b = find();
   /// Repl b = find();
   /// print(a==b); (false)```
   /// print(a==b); (false)```
   void create<S>(InstanceBuilderCallback<S> builder,
   void create<S>(InstanceBuilderCallback<S> builder,
-          {String tag, bool permanent = true}) =>
+          {String? tag, bool permanent = true}) =>
       GetInstance().create<S>(builder, tag: tag, permanent: permanent);
       GetInstance().create<S>(builder, tag: tag, permanent: permanent);
 
 
   /// Finds a Instance of the required Class <[S]>(or [tag])
   /// Finds a Instance of the required Class <[S]>(or [tag])
   /// In the case of using [Get.create()], it will generate an Instance
   /// In the case of using [Get.create()], it will generate an Instance
   /// each time you call [Get.find()].
   /// each time you call [Get.find()].
-  S find<S>({String tag}) => GetInstance().find<S>(tag: tag);
+  S? find<S>({String? tag}) => GetInstance().find<S>(tag: tag);
 
 
   /// Injects an [Instance<S>] in memory.
   /// Injects an [Instance<S>] in memory.
   ///
   ///
@@ -83,10 +83,10 @@ extension Inst on GetInterface {
   /// rules. Although, can be removed by [GetInstance.reset()]
   /// rules. Although, can be removed by [GetInstance.reset()]
   /// and [Get.delete()]
   /// and [Get.delete()]
   /// - [builder] If defined, the [dependency] must be returned from here
   /// - [builder] If defined, the [dependency] must be returned from here
-  S put<S>(S dependency,
-          {String tag,
+  S? put<S>(S dependency,
+          {String? tag,
           bool permanent = false,
           bool permanent = false,
-          InstanceBuilderCallback<S> builder}) =>
+          InstanceBuilderCallback<S>? builder}) =>
       GetInstance().put<S>(dependency, tag: tag, permanent: permanent);
       GetInstance().put<S>(dependency, tag: tag, permanent: permanent);
 
 
   /// Clears all registered instances (and/or tags).
   /// Clears all registered instances (and/or tags).
@@ -104,15 +104,15 @@ extension Inst on GetInterface {
   ///
   ///
   /// - [tag] Optional "tag" used to register the Instance
   /// - [tag] Optional "tag" used to register the Instance
   /// - [force] Will delete an Instance even if marked as [permanent].
   /// - [force] Will delete an Instance even if marked as [permanent].
-  Future<bool> delete<S>({String tag, bool force = false}) async =>
+  Future<bool> delete<S>({String? tag, bool force = false}) async =>
       GetInstance().delete<S>(tag: tag, force: force);
       GetInstance().delete<S>(tag: tag, force: force);
 
 
   /// Checks if a Class Instance<[S]> (or [tag]) is registered in memory.
   /// Checks if a Class Instance<[S]> (or [tag]) is registered in memory.
   /// - [tag] optional, if you use a [tag] to register the Instance.
   /// - [tag] optional, if you use a [tag] to register the Instance.
-  bool isRegistered<S>({String tag}) => GetInstance().isRegistered<S>(tag: tag);
+  bool isRegistered<S>({String? tag}) => GetInstance().isRegistered<S>(tag: tag);
 
 
   /// Checks if an Instance<[S]> (or [tag]) returned from a factory builder
   /// Checks if an Instance<[S]> (or [tag]) returned from a factory builder
   /// [Get.lazyPut()], is registered in memory.
   /// [Get.lazyPut()], is registered in memory.
   /// - [tag] optional, if you use a [tag] to register the Instance.
   /// - [tag] optional, if you use a [tag] to register the Instance.
-  bool isPrepared<S>({String tag}) => GetInstance().isPrepared<S>(tag: tag);
+  bool isPrepared<S>({String? tag}) => GetInstance().isPrepared<S>(tag: tag);
 }
 }

@@ -8,18 +8,18 @@ import '../../get_core/get_core.dart';
 import 'lifecycle.dart';
 import 'lifecycle.dart';
 
 
 class InstanceInfo {
 class InstanceInfo {
-  final bool isPermanent;
-  final bool isSingleton;
-  bool get isCreate => !isSingleton;
+  final bool? isPermanent;
+  final bool? isSingleton;
+  bool get isCreate => !isSingleton!;
   final bool isRegistered;
   final bool isRegistered;
   final bool isPrepared;
   final bool isPrepared;
-  final bool isInit;
+  final bool? isInit;
   const InstanceInfo({
   const InstanceInfo({
-    @required this.isPermanent,
-    @required this.isSingleton,
-    @required this.isRegistered,
-    @required this.isPrepared,
-    @required this.isInit,
+    required this.isPermanent,
+    required this.isSingleton,
+    required this.isRegistered,
+    required this.isPrepared,
+    required this.isInit,
   });
   });
 }
 }
 
 
@@ -28,9 +28,9 @@ class GetInstance {
 
 
   const GetInstance._();
   const GetInstance._();
 
 
-  static GetInstance _getInstance;
+  static GetInstance? _getInstance;
 
 
-  T call<T>() => find<T>();
+  T? call<T>() => find<T>();
 
 
   /// Holds references to every registered Instance when using
   /// Holds references to every registered Instance when using
   /// [Get.put()]
   /// [Get.put()]
@@ -42,13 +42,13 @@ class GetInstance {
 
 
   /// Holds a reference to [Get.reference] when the Instance was
   /// Holds a reference to [Get.reference] when the Instance was
   /// created to manage the memory.
   /// created to manage the memory.
-  static final Map<String, String> _routesKey = {};
+  static final Map<String, String?> _routesKey = {};
 
 
   /// Stores the onClose() references of instances created with [Get.create()]
   /// Stores the onClose() references of instances created with [Get.create()]
   /// using the [Get.reference].
   /// using the [Get.reference].
   /// Experimental feature to keep the lifecycle and memory management with
   /// Experimental feature to keep the lifecycle and memory management with
   /// non-singleton instances.
   /// non-singleton instances.
-  static final Map<String, HashSet<Function>> _routesByCreate = {};
+  static final Map<String?, HashSet<Function>> _routesByCreate = {};
 
 
   void printInstanceStack() {
   void printInstanceStack() {
     Get.log(_routesKey.toString());
     Get.log(_routesKey.toString());
@@ -56,7 +56,7 @@ class GetInstance {
 
 
   void injector<S>(
   void injector<S>(
     InjectorBuilderCallback<S> fn, {
     InjectorBuilderCallback<S> fn, {
-    String tag,
+    String? tag,
     bool fenix = false,
     bool fenix = false,
     //  bool permanent = false,
     //  bool permanent = false,
   }) {
   }) {
@@ -71,9 +71,9 @@ class GetInstance {
   /// async version of [Get.put()].
   /// async version of [Get.put()].
   /// Awaits for the resolution of the Future from [builder()] parameter and
   /// Awaits for the resolution of the Future from [builder()] parameter and
   /// stores the Instance returned.
   /// stores the Instance returned.
-  Future<S> putAsync<S>(
+  Future<S?> putAsync<S>(
     AsyncInstanceBuilderCallback<S> builder, {
     AsyncInstanceBuilderCallback<S> builder, {
-    String tag,
+    String? tag,
     bool permanent = false,
     bool permanent = false,
   }) async {
   }) async {
     return put<S>(await builder(), tag: tag, permanent: permanent);
     return put<S>(await builder(), tag: tag, permanent: permanent);
@@ -89,11 +89,11 @@ class GetInstance {
   /// the same Type<[S]>
   /// the same Type<[S]>
   /// - [permanent] keeps the Instance in memory, not following
   /// - [permanent] keeps the Instance in memory, not following
   /// [Get.smartManagement] rules.
   /// [Get.smartManagement] rules.
-  S put<S>(
+  S? put<S>(
     S dependency, {
     S dependency, {
-    String tag,
+    String? tag,
     bool permanent = false,
     bool permanent = false,
-    @deprecated InstanceBuilderCallback<S> builder,
+    @deprecated InstanceBuilderCallback<S>? builder,
   }) {
   }) {
     _insert(
     _insert(
         isSingleton: true,
         isSingleton: true,
@@ -127,8 +127,8 @@ class GetInstance {
   /// (<[S]> and optionally [tag] will **not** override the original).
   /// (<[S]> and optionally [tag] will **not** override the original).
   void lazyPut<S>(
   void lazyPut<S>(
     InstanceBuilderCallback<S> builder, {
     InstanceBuilderCallback<S> builder, {
-    String tag,
-    bool fenix,
+    String? tag,
+    bool? fenix,
     bool permanent = false,
     bool permanent = false,
   }) {
   }) {
     _insert(
     _insert(
@@ -158,7 +158,7 @@ class GetInstance {
   /// print(a==b); (false)```
   /// print(a==b); (false)```
   void create<S>(
   void create<S>(
     InstanceBuilderCallback<S> builder, {
     InstanceBuilderCallback<S> builder, {
-    String tag,
+    String? tag,
     bool permanent = true,
     bool permanent = true,
   }) {
   }) {
     _insert(
     _insert(
@@ -171,10 +171,10 @@ class GetInstance {
 
 
   /// Injects the Instance [S] builder into the [_singleton] HashMap.
   /// Injects the Instance [S] builder into the [_singleton] HashMap.
   void _insert<S>({
   void _insert<S>({
-    bool isSingleton,
-    String name,
+    bool? isSingleton,
+    String? name,
     bool permanent = false,
     bool permanent = false,
-    InstanceBuilderCallback<S> builder,
+    required InstanceBuilderCallback<S> builder,
     bool fenix = false,
     bool fenix = false,
   }) {
   }) {
     assert(builder != null);
     assert(builder != null);
@@ -206,14 +206,14 @@ class GetInstance {
 
 
     /// Removes [Get.create()] instances registered in [routeName].
     /// Removes [Get.create()] instances registered in [routeName].
     if (_routesByCreate.containsKey(routeName)) {
     if (_routesByCreate.containsKey(routeName)) {
-      for (final onClose in _routesByCreate[routeName]) {
+      for (final onClose in _routesByCreate[routeName]!) {
         // assure the [DisposableInterface] instance holding a reference
         // assure the [DisposableInterface] instance holding a reference
         // to [onClose()] wasn't disposed.
         // to [onClose()] wasn't disposed.
         if (onClose != null) {
         if (onClose != null) {
           onClose();
           onClose();
         }
         }
       }
       }
-      _routesByCreate[routeName].clear();
+      _routesByCreate[routeName]!.clear();
       _routesByCreate.remove(routeName);
       _routesByCreate.remove(routeName);
     }
     }
 
 
@@ -236,14 +236,14 @@ class GetInstance {
   /// (not for Singletons access).
   /// (not for Singletons access).
   /// Returns the instance if not initialized, required for Get.create() to
   /// Returns the instance if not initialized, required for Get.create() to
   /// work properly.
   /// work properly.
-  S _initDependencies<S>({String name}) {
+  S? _initDependencies<S>({String? name}) {
     final key = _getKey(S, name);
     final key = _getKey(S, name);
-    final isInit = _singl[key].isInit;
-    S i;
+    final isInit = _singl[key]!.isInit;
+    S? i;
     if (!isInit) {
     if (!isInit) {
       i = _startController<S>(tag: name);
       i = _startController<S>(tag: name);
-      if (_singl[key].isSingleton) {
-        _singl[key].isInit = true;
+      if (_singl[key]!.isSingleton!) {
+        _singl[key]!.isInit = true;
         if (Get.smartManagement != SmartManagement.onlyBuilder) {
         if (Get.smartManagement != SmartManagement.onlyBuilder) {
           _registerRouteInstance<S>(tag: name);
           _registerRouteInstance<S>(tag: name);
         }
         }
@@ -254,11 +254,11 @@ class GetInstance {
 
 
   /// Links a Class instance [S] (or [tag]) to the current route.
   /// Links a Class instance [S] (or [tag]) to the current route.
   /// Requires usage of [GetMaterialApp].
   /// Requires usage of [GetMaterialApp].
-  void _registerRouteInstance<S>({String tag}) {
+  void _registerRouteInstance<S>({String? tag}) {
     _routesKey.putIfAbsent(_getKey(S, tag), () => Get.reference);
     _routesKey.putIfAbsent(_getKey(S, tag), () => Get.reference);
   }
   }
 
 
-  InstanceInfo getInstanceInfo<S>({String tag}) {
+  InstanceInfo getInstanceInfo<S>({String? tag}) {
     final build = _getDependency<S>(tag: tag);
     final build = _getDependency<S>(tag: tag);
 
 
     return InstanceInfo(
     return InstanceInfo(
@@ -270,7 +270,7 @@ class GetInstance {
     );
     );
   }
   }
 
 
-  _InstanceBuilderFactory _getDependency<S>({String tag, String key}) {
+  _InstanceBuilderFactory? _getDependency<S>({String? tag, String? key}) {
     final newKey = key ?? _getKey(S, tag);
     final newKey = key ?? _getKey(S, tag);
 
 
     if (!_singl.containsKey(newKey)) {
     if (!_singl.containsKey(newKey)) {
@@ -282,9 +282,9 @@ class GetInstance {
   }
   }
 
 
   /// Initializes the controller
   /// Initializes the controller
-  S _startController<S>({String tag}) {
+  S? _startController<S>({String? tag}) {
     final key = _getKey(S, tag);
     final key = _getKey(S, tag);
-    final i = _singl[key].getDependency() as S;
+    final i = _singl[key]!.getDependency() as S?;
     if (i is GetLifeCycleBase) {
     if (i is GetLifeCycleBase) {
       if (i.onStart != null) {
       if (i.onStart != null) {
         i.onStart();
         i.onStart();
@@ -294,19 +294,19 @@ class GetInstance {
           Get.log('Instance "$S" with tag "$tag" has been initialized');
           Get.log('Instance "$S" with tag "$tag" has been initialized');
         }
         }
       }
       }
-      if (!_singl[key].isSingleton && i.onDelete != null) {
+      if (!_singl[key]!.isSingleton! && i.onDelete != null) {
         _routesByCreate[Get.reference] ??= HashSet<Function>();
         _routesByCreate[Get.reference] ??= HashSet<Function>();
-        _routesByCreate[Get.reference].add(i.onDelete);
+        _routesByCreate[Get.reference]!.add(i.onDelete as Function);
       }
       }
     }
     }
     return i;
     return i;
   }
   }
 
 
-  S putOrFind<S>(InstanceBuilderCallback<S> dep, {String tag}) {
+  S? putOrFind<S>(InstanceBuilderCallback<S> dep, {String? tag}) {
     final key = _getKey(S, tag);
     final key = _getKey(S, tag);
 
 
     if (_singl.containsKey(key)) {
     if (_singl.containsKey(key)) {
-      return _singl[key].getDependency() as S;
+      return _singl[key]!.getDependency() as S?;
     } else {
     } else {
       return GetInstance().put(dep(), tag: tag);
       return GetInstance().put(dep(), tag: tag);
     }
     }
@@ -317,7 +317,7 @@ class GetInstance {
   /// it will create an instance each time you call [find].
   /// it will create an instance each time you call [find].
   /// If the registered type <[S]> (or [tag]) is a Controller,
   /// If the registered type <[S]> (or [tag]) is a Controller,
   /// it will initialize it's lifecycle.
   /// it will initialize it's lifecycle.
-  S find<S>({String tag}) {
+  S? find<S>({String? tag}) {
     final key = _getKey(S, tag);
     final key = _getKey(S, tag);
     if (isRegistered<S>(tag: tag)) {
     if (isRegistered<S>(tag: tag)) {
       if (_singl[key] == null) {
       if (_singl[key] == null) {
@@ -332,7 +332,7 @@ class GetInstance {
       /// `initDependencies`, so we have to return the instance from there
       /// `initDependencies`, so we have to return the instance from there
       /// to make it compatible with `Get.create()`.
       /// to make it compatible with `Get.create()`.
       final i = _initDependencies<S>(name: tag);
       final i = _initDependencies<S>(name: tag);
-      return i ?? _singl[key].getDependency() as S;
+      return i ?? _singl[key]!.getDependency() as S?;
     } else {
     } else {
       // ignore: lines_longer_than_80_chars
       // ignore: lines_longer_than_80_chars
       throw '"$S" not found. You need to call "Get.put($S())" or "Get.lazyPut(()=>$S())"';
       throw '"$S" not found. You need to call "Get.put($S())" or "Get.lazyPut(()=>$S())"';
@@ -341,7 +341,7 @@ class GetInstance {
 
 
   /// Generates the key based on [type] (and optionally a [name])
   /// Generates the key based on [type] (and optionally a [name])
   /// to register an Instance Builder in the hashmap.
   /// to register an Instance Builder in the hashmap.
-  String _getKey(Type type, String name) {
+  String _getKey(Type type, String? name) {
     return name == null ? type.toString() : type.toString() + name;
     return name == null ? type.toString() : type.toString() + name;
   }
   }
 
 
@@ -374,7 +374,7 @@ class GetInstance {
   /// - [key] For internal usage, is the processed key used to register
   /// - [key] For internal usage, is the processed key used to register
   ///   the Instance. **don't use** it unless you know what you are doing.
   ///   the Instance. **don't use** it unless you know what you are doing.
   /// - [force] Will delete an Instance even if marked as [permanent].
   /// - [force] Will delete an Instance even if marked as [permanent].
-  bool delete<S>({String tag, String key, bool force = false}) {
+  bool delete<S>({String? tag, String? key, bool force = false}) {
     final newKey = key ?? _getKey(S, tag);
     final newKey = key ?? _getKey(S, tag);
 
 
     if (!_singl.containsKey(newKey)) {
     if (!_singl.containsKey(newKey)) {
@@ -382,7 +382,7 @@ class GetInstance {
       return false;
       return false;
     }
     }
 
 
-    final builder = _singl[newKey];
+    final builder = _singl[newKey]!;
 
 
     if (builder.permanent && !force) {
     if (builder.permanent && !force) {
       Get.log(
       Get.log(
@@ -430,7 +430,7 @@ class GetInstance {
     });
     });
   }
   }
 
 
-  void reload<S>({String tag, String key, bool force = false}) {
+  void reload<S>({String? tag, String? key, bool force = false}) {
     final newKey = key ?? _getKey(S, tag);
     final newKey = key ?? _getKey(S, tag);
 
 
     final builder = _getDependency<S>(tag: tag, key: newKey);
     final builder = _getDependency<S>(tag: tag, key: newKey);
@@ -451,12 +451,12 @@ class GetInstance {
 
 
   /// Check if a Class Instance<[S]> (or [tag]) is registered in memory.
   /// Check if a Class Instance<[S]> (or [tag]) is registered in memory.
   /// - [tag] is optional, if you used a [tag] to register the Instance.
   /// - [tag] is optional, if you used a [tag] to register the Instance.
-  bool isRegistered<S>({String tag}) => _singl.containsKey(_getKey(S, tag));
+  bool isRegistered<S>({String? tag}) => _singl.containsKey(_getKey(S, tag));
 
 
   /// Checks if a lazy factory callback ([Get.lazyPut()] that returns an
   /// Checks if a lazy factory callback ([Get.lazyPut()] that returns an
   /// Instance<[S]> is registered in memory.
   /// Instance<[S]> is registered in memory.
   /// - [tag] is optional, if you used a [tag] to register the lazy Instance.
   /// - [tag] is optional, if you used a [tag] to register the lazy Instance.
-  bool isPrepared<S>({String tag}) {
+  bool isPrepared<S>({String? tag}) {
     final newKey = _getKey(S, tag);
     final newKey = _getKey(S, tag);
 
 
     final builder = _getDependency<S>(tag: tag, key: newKey);
     final builder = _getDependency<S>(tag: tag, key: newKey);
@@ -481,14 +481,14 @@ typedef AsyncInstanceBuilderCallback<S> = Future<S> Function();
 class _InstanceBuilderFactory<S> {
 class _InstanceBuilderFactory<S> {
   /// Marks the Builder as a single instance.
   /// Marks the Builder as a single instance.
   /// For reusing [dependency] instead of [builderFunc]
   /// For reusing [dependency] instead of [builderFunc]
-  bool isSingleton;
+  bool? isSingleton;
 
 
   /// When fenix mode is avaliable, when a new instance is need
   /// When fenix mode is avaliable, when a new instance is need
   /// Instance manager will recreate a new instance of S
   /// Instance manager will recreate a new instance of S
   bool fenix;
   bool fenix;
 
 
   /// Stores the actual object instance when [isSingleton]=true.
   /// Stores the actual object instance when [isSingleton]=true.
-  S dependency;
+  S? dependency;
 
 
   /// Generates (and regenerates) the instance when [isSingleton]=false.
   /// Generates (and regenerates) the instance when [isSingleton]=false.
   /// Usually used by factory methods
   /// Usually used by factory methods
@@ -500,7 +500,7 @@ class _InstanceBuilderFactory<S> {
 
 
   bool isInit = false;
   bool isInit = false;
 
 
-  String tag;
+  String? tag;
 
 
   _InstanceBuilderFactory(
   _InstanceBuilderFactory(
     this.isSingleton,
     this.isSingleton,
@@ -520,8 +520,8 @@ class _InstanceBuilderFactory<S> {
   }
   }
 
 
   /// Gets the actual instance by it's [builderFunc] or the persisted instance.
   /// Gets the actual instance by it's [builderFunc] or the persisted instance.
-  S getDependency() {
-    if (isSingleton) {
+  S? getDependency() {
+    if (isSingleton!) {
       if (dependency == null) {
       if (dependency == null) {
         _showInitLog();
         _showInitLog();
         dependency = builderFunc();
         dependency = builderFunc();

@@ -5,11 +5,11 @@ import '../../get_core/get_core.dart';
 /// methods.
 /// methods.
 /// Used in [DisposableInterface] to avoid the danger of overriding onStart.
 /// Used in [DisposableInterface] to avoid the danger of overriding onStart.
 class _InternalFinalCallback<T> {
 class _InternalFinalCallback<T> {
-  ValueUpdater<T> _callback;
+  ValueUpdater<T>? _callback;
 
 
-  _InternalFinalCallback({ValueUpdater<T> callback}) : _callback = callback;
+  _InternalFinalCallback({ValueUpdater<T>? callback}) : _callback = callback;
 
 
-  T call() => _callback.call();
+  T call() => _callback!.call();
 }
 }
 
 
 /// The [GetLifeCycle]
 /// The [GetLifeCycle]

@@ -14,8 +14,8 @@ class GetModalBottomSheetRoute<T> extends PopupRoute<T> {
     this.modalBarrierColor,
     this.modalBarrierColor,
     this.isDismissible = true,
     this.isDismissible = true,
     this.enableDrag = true,
     this.enableDrag = true,
-    @required this.isScrollControlled,
-    RouteSettings settings,
+    required this.isScrollControlled,
+    RouteSettings? settings,
     this.enterBottomSheetDuration = const Duration(milliseconds: 250),
     this.enterBottomSheetDuration = const Duration(milliseconds: 250),
     this.exitBottomSheetDuration = const Duration(milliseconds: 200),
     this.exitBottomSheetDuration = const Duration(milliseconds: 200),
   })  : assert(isScrollControlled != null),
   })  : assert(isScrollControlled != null),
@@ -23,15 +23,15 @@ class GetModalBottomSheetRoute<T> extends PopupRoute<T> {
         assert(isDismissible != null),
         assert(isDismissible != null),
         assert(enableDrag != null),
         assert(enableDrag != null),
         super(settings: settings);
         super(settings: settings);
-  final bool isPersistent;
-  final WidgetBuilder builder;
-  final ThemeData theme;
+  final bool? isPersistent;
+  final WidgetBuilder? builder;
+  final ThemeData? theme;
   final bool isScrollControlled;
   final bool isScrollControlled;
-  final Color backgroundColor;
-  final double elevation;
-  final ShapeBorder shape;
-  final Clip clipBehavior;
-  final Color modalBarrierColor;
+  final Color? backgroundColor;
+  final double? elevation;
+  final ShapeBorder? shape;
+  final Clip? clipBehavior;
+  final Color? modalBarrierColor;
   final bool isDismissible;
   final bool isDismissible;
   final bool enableDrag;
   final bool enableDrag;
   final String name;
   final String name;
@@ -47,21 +47,21 @@ class GetModalBottomSheetRoute<T> extends PopupRoute<T> {
   bool get barrierDismissible => isDismissible;
   bool get barrierDismissible => isDismissible;
 
 
   @override
   @override
-  final String barrierLabel;
+  final String? barrierLabel;
 
 
   @override
   @override
   Color get barrierColor => modalBarrierColor ?? Colors.black54;
   Color get barrierColor => modalBarrierColor ?? Colors.black54;
 
 
-  AnimationController _animationController;
+  AnimationController? _animationController;
 
 
   @override
   @override
   AnimationController createAnimationController() {
   AnimationController createAnimationController() {
     assert(_animationController == null);
     assert(_animationController == null);
     _animationController =
     _animationController =
-        BottomSheet.createAnimationController(navigator.overlay);
-    _animationController.duration = enterBottomSheetDuration;
-    _animationController.reverseDuration = exitBottomSheetDuration;
-    return _animationController;
+        BottomSheet.createAnimationController(navigator!.overlay!);
+    _animationController!.duration = enterBottomSheetDuration;
+    _animationController!.reverseDuration = exitBottomSheetDuration;
+    return _animationController!;
   }
   }
 
 
   @override
   @override
@@ -91,14 +91,14 @@ class GetModalBottomSheetRoute<T> extends PopupRoute<T> {
         ),
         ),
       ),
       ),
     );
     );
-    if (theme != null) bottomSheet = Theme(data: theme, child: bottomSheet);
+    if (theme != null) bottomSheet = Theme(data: theme!, child: bottomSheet);
     return bottomSheet;
     return bottomSheet;
   }
   }
 }
 }
 
 
 class _GetModalBottomSheet<T> extends StatefulWidget {
 class _GetModalBottomSheet<T> extends StatefulWidget {
   const _GetModalBottomSheet({
   const _GetModalBottomSheet({
-    Key key,
+    Key? key,
     this.route,
     this.route,
     this.backgroundColor,
     this.backgroundColor,
     this.elevation,
     this.elevation,
@@ -111,12 +111,12 @@ class _GetModalBottomSheet<T> extends StatefulWidget {
         assert(enableDrag != null),
         assert(enableDrag != null),
         super(key: key);
         super(key: key);
   final bool isPersistent;
   final bool isPersistent;
-  final GetModalBottomSheetRoute<T> route;
+  final GetModalBottomSheetRoute<T>? route;
   final bool isScrollControlled;
   final bool isScrollControlled;
-  final Color backgroundColor;
-  final double elevation;
-  final ShapeBorder shape;
-  final Clip clipBehavior;
+  final Color? backgroundColor;
+  final double? elevation;
+  final ShapeBorder? shape;
+  final Clip? clipBehavior;
   final bool enableDrag;
   final bool enableDrag;
 
 
   @override
   @override
@@ -142,13 +142,13 @@ class _GetModalBottomSheetState<T> extends State<_GetModalBottomSheet<T>> {
     final routeLabel = _getRouteLabel(localizations);
     final routeLabel = _getRouteLabel(localizations);
 
 
     return AnimatedBuilder(
     return AnimatedBuilder(
-      animation: widget.route.animation,
+      animation: widget.route!.animation!,
       builder: (context, child) {
       builder: (context, child) {
         // Disable the initial animation when accessible navigation is on so
         // Disable the initial animation when accessible navigation is on so
         // that the semantics are added to the tree at the correct time.
         // that the semantics are added to the tree at the correct time.
         final animationValue = mediaQuery.accessibleNavigation
         final animationValue = mediaQuery.accessibleNavigation
             ? 1.0
             ? 1.0
-            : widget.route.animation.value;
+            : widget.route!.animation!.value;
         return Semantics(
         return Semantics(
           scopesRoute: true,
           scopesRoute: true,
           namesRoute: true,
           namesRoute: true,
@@ -160,13 +160,13 @@ class _GetModalBottomSheetState<T> extends State<_GetModalBottomSheet<T>> {
                     animationValue, widget.isScrollControlled),
                     animationValue, widget.isScrollControlled),
                 child: widget.isPersistent == false
                 child: widget.isPersistent == false
                     ? BottomSheet(
                     ? BottomSheet(
-                        animationController: widget.route._animationController,
+                        animationController: widget.route!._animationController,
                         onClosing: () {
                         onClosing: () {
-                          if (widget.route.isCurrent) {
+                          if (widget.route!.isCurrent) {
                             Navigator.pop(context);
                             Navigator.pop(context);
                           }
                           }
                         },
                         },
-                        builder: widget.route.builder,
+                        builder: widget.route!.builder!,
                         backgroundColor: widget.backgroundColor,
                         backgroundColor: widget.backgroundColor,
                         elevation: widget.elevation,
                         elevation: widget.elevation,
                         shape: widget.shape,
                         shape: widget.shape,
@@ -176,13 +176,13 @@ class _GetModalBottomSheetState<T> extends State<_GetModalBottomSheet<T>> {
                     : Scaffold(
                     : Scaffold(
                         bottomSheet: BottomSheet(
                         bottomSheet: BottomSheet(
                           animationController:
                           animationController:
-                              widget.route._animationController,
+                              widget.route!._animationController,
                           onClosing: () {
                           onClosing: () {
                             // if (widget.route.isCurrent) {
                             // if (widget.route.isCurrent) {
                             //   Navigator.pop(context);
                             //   Navigator.pop(context);
                             // }
                             // }
                           },
                           },
-                          builder: widget.route.builder,
+                          builder: widget.route!.builder!,
                           backgroundColor: widget.backgroundColor,
                           backgroundColor: widget.backgroundColor,
                           elevation: widget.elevation,
                           elevation: widget.elevation,
                           shape: widget.shape,
                           shape: widget.shape,
@@ -199,7 +199,7 @@ class _GetModalBottomSheetState<T> extends State<_GetModalBottomSheet<T>> {
 
 
 class _GetPerModalBottomSheet<T> extends StatefulWidget {
 class _GetPerModalBottomSheet<T> extends StatefulWidget {
   const _GetPerModalBottomSheet({
   const _GetPerModalBottomSheet({
-    Key key,
+    Key? key,
     this.route,
     this.route,
     this.isPersistent,
     this.isPersistent,
     this.backgroundColor,
     this.backgroundColor,
@@ -211,13 +211,13 @@ class _GetPerModalBottomSheet<T> extends StatefulWidget {
   })  : assert(isScrollControlled != null),
   })  : assert(isScrollControlled != null),
         assert(enableDrag != null),
         assert(enableDrag != null),
         super(key: key);
         super(key: key);
-  final bool isPersistent;
-  final GetModalBottomSheetRoute<T> route;
+  final bool? isPersistent;
+  final GetModalBottomSheetRoute<T>? route;
   final bool isScrollControlled;
   final bool isScrollControlled;
-  final Color backgroundColor;
-  final double elevation;
-  final ShapeBorder shape;
-  final Clip clipBehavior;
+  final Color? backgroundColor;
+  final double? elevation;
+  final ShapeBorder? shape;
+  final Clip? clipBehavior;
   final bool enableDrag;
   final bool enableDrag;
 
 
   @override
   @override
@@ -247,13 +247,13 @@ class _GetPerModalBottomSheetState<T>
     final routeLabel = _getRouteLabel(localizations);
     final routeLabel = _getRouteLabel(localizations);
 
 
     return AnimatedBuilder(
     return AnimatedBuilder(
-      animation: widget.route.animation,
+      animation: widget.route!.animation!,
       builder: (context, child) {
       builder: (context, child) {
         // Disable the initial animation when accessible navigation is on so
         // Disable the initial animation when accessible navigation is on so
         // that the semantics are added to the tree at the correct time.
         // that the semantics are added to the tree at the correct time.
         final animationValue = mediaQuery.accessibleNavigation
         final animationValue = mediaQuery.accessibleNavigation
             ? 1.0
             ? 1.0
-            : widget.route.animation.value;
+            : widget.route!.animation!.value;
         return Semantics(
         return Semantics(
           scopesRoute: true,
           scopesRoute: true,
           namesRoute: true,
           namesRoute: true,
@@ -265,13 +265,13 @@ class _GetPerModalBottomSheetState<T>
                     animationValue, widget.isScrollControlled),
                     animationValue, widget.isScrollControlled),
                 child: widget.isPersistent == false
                 child: widget.isPersistent == false
                     ? BottomSheet(
                     ? BottomSheet(
-                        animationController: widget.route._animationController,
+                        animationController: widget.route!._animationController,
                         onClosing: () {
                         onClosing: () {
-                          if (widget.route.isCurrent) {
+                          if (widget.route!.isCurrent) {
                             Navigator.pop(context);
                             Navigator.pop(context);
                           }
                           }
                         },
                         },
-                        builder: widget.route.builder,
+                        builder: widget.route!.builder!,
                         backgroundColor: widget.backgroundColor,
                         backgroundColor: widget.backgroundColor,
                         elevation: widget.elevation,
                         elevation: widget.elevation,
                         shape: widget.shape,
                         shape: widget.shape,
@@ -281,13 +281,13 @@ class _GetPerModalBottomSheetState<T>
                     : Scaffold(
                     : Scaffold(
                         bottomSheet: BottomSheet(
                         bottomSheet: BottomSheet(
                           animationController:
                           animationController:
-                              widget.route._animationController,
+                              widget.route!._animationController,
                           onClosing: () {
                           onClosing: () {
                             // if (widget.route.isCurrent) {
                             // if (widget.route.isCurrent) {
                             //   Navigator.pop(context);
                             //   Navigator.pop(context);
                             // }
                             // }
                           },
                           },
-                          builder: widget.route.builder,
+                          builder: widget.route!.builder!,
                           backgroundColor: widget.backgroundColor,
                           backgroundColor: widget.backgroundColor,
                           elevation: widget.elevation,
                           elevation: widget.elevation,
                           shape: widget.shape,
                           shape: widget.shape,

@@ -4,13 +4,13 @@ import '../../../get_instance/src/get_instance.dart';
 
 
 class GetDialogRoute<T> extends PopupRoute<T> {
 class GetDialogRoute<T> extends PopupRoute<T> {
   GetDialogRoute({
   GetDialogRoute({
-    @required RoutePageBuilder pageBuilder,
+    required RoutePageBuilder pageBuilder,
     bool barrierDismissible = true,
     bool barrierDismissible = true,
-    String barrierLabel,
+    String? barrierLabel,
     Color barrierColor = const Color(0x80000000),
     Color barrierColor = const Color(0x80000000),
     Duration transitionDuration = const Duration(milliseconds: 200),
     Duration transitionDuration = const Duration(milliseconds: 200),
-    RouteTransitionsBuilder transitionBuilder,
-    RouteSettings settings,
+    RouteTransitionsBuilder? transitionBuilder,
+    RouteSettings? settings,
   })  : assert(barrierDismissible != null),
   })  : assert(barrierDismissible != null),
         widget = pageBuilder,
         widget = pageBuilder,
         name = "DIALOG: ${pageBuilder.hashCode}",
         name = "DIALOG: ${pageBuilder.hashCode}",
@@ -32,15 +32,15 @@ class GetDialogRoute<T> extends PopupRoute<T> {
   @override
   @override
   void dispose() {
   void dispose() {
     if (Get.smartManagement != SmartManagement.onlyBuilder) {
     if (Get.smartManagement != SmartManagement.onlyBuilder) {
-      WidgetsBinding.instance.addPostFrameCallback(
+      WidgetsBinding.instance!.addPostFrameCallback(
           (_) => GetInstance().removeDependencyByRoute(name));
           (_) => GetInstance().removeDependencyByRoute(name));
     }
     }
     super.dispose();
     super.dispose();
   }
   }
 
 
   @override
   @override
-  String get barrierLabel => _barrierLabel;
-  final String _barrierLabel;
+  String? get barrierLabel => _barrierLabel;
+  final String? _barrierLabel;
 
 
   @override
   @override
   Color get barrierColor => _barrierColor;
   Color get barrierColor => _barrierColor;
@@ -50,7 +50,7 @@ class GetDialogRoute<T> extends PopupRoute<T> {
   Duration get transitionDuration => _transitionDuration;
   Duration get transitionDuration => _transitionDuration;
   final Duration _transitionDuration;
   final Duration _transitionDuration;
 
 
-  final RouteTransitionsBuilder _transitionBuilder;
+  final RouteTransitionsBuilder? _transitionBuilder;
 
 
   @override
   @override
   Widget buildPage(BuildContext context, Animation<double> animation,
   Widget buildPage(BuildContext context, Animation<double> animation,
@@ -73,6 +73,6 @@ class GetDialogRoute<T> extends PopupRoute<T> {
           ),
           ),
           child: child);
           child: child);
     } // Some default transition
     } // Some default transition
-    return _transitionBuilder(context, animation, secondaryAnimation, child);
+    return _transitionBuilder!(context, animation, secondaryAnimation, child);
   }
   }
 }
 }

@@ -14,42 +14,42 @@ import 'routes/transitions_type.dart';
 
 
 extension ExtensionSnackbar on GetInterface {
 extension ExtensionSnackbar on GetInterface {
   void rawSnackbar({
   void rawSnackbar({
-    String title,
-    String message,
-    Widget titleText,
-    Widget messageText,
-    Widget icon,
+    String? title,
+    String? message,
+    Widget? titleText,
+    Widget? messageText,
+    Widget? icon,
     bool instantInit = true,
     bool instantInit = true,
     bool shouldIconPulse = true,
     bool shouldIconPulse = true,
-    double maxWidth,
+    double? maxWidth,
     EdgeInsets margin = const EdgeInsets.all(0.0),
     EdgeInsets margin = const EdgeInsets.all(0.0),
     EdgeInsets padding = const EdgeInsets.all(16),
     EdgeInsets padding = const EdgeInsets.all(16),
     double borderRadius = 0.0,
     double borderRadius = 0.0,
-    Color borderColor,
+    Color? borderColor,
     double borderWidth = 1.0,
     double borderWidth = 1.0,
     Color backgroundColor = const Color(0xFF303030),
     Color backgroundColor = const Color(0xFF303030),
-    Color leftBarIndicatorColor,
-    List<BoxShadow> boxShadows,
-    Gradient backgroundGradient,
-    Widget mainButton,
-    OnTap onTap,
+    Color? leftBarIndicatorColor,
+    List<BoxShadow>? boxShadows,
+    Gradient? backgroundGradient,
+    Widget? mainButton,
+    OnTap? onTap,
     Duration duration = const Duration(seconds: 3),
     Duration duration = const Duration(seconds: 3),
     bool isDismissible = true,
     bool isDismissible = true,
     SnackDismissDirection dismissDirection = SnackDismissDirection.VERTICAL,
     SnackDismissDirection dismissDirection = SnackDismissDirection.VERTICAL,
     bool showProgressIndicator = false,
     bool showProgressIndicator = false,
-    AnimationController progressIndicatorController,
-    Color progressIndicatorBackgroundColor,
-    Animation<Color> progressIndicatorValueColor,
+    AnimationController? progressIndicatorController,
+    Color? progressIndicatorBackgroundColor,
+    Animation<Color>? progressIndicatorValueColor,
     SnackPosition snackPosition = SnackPosition.BOTTOM,
     SnackPosition snackPosition = SnackPosition.BOTTOM,
     SnackStyle snackStyle = SnackStyle.FLOATING,
     SnackStyle snackStyle = SnackStyle.FLOATING,
     Curve forwardAnimationCurve = Curves.easeOutCirc,
     Curve forwardAnimationCurve = Curves.easeOutCirc,
     Curve reverseAnimationCurve = Curves.easeOutCirc,
     Curve reverseAnimationCurve = Curves.easeOutCirc,
     Duration animationDuration = const Duration(seconds: 1),
     Duration animationDuration = const Duration(seconds: 1),
-    SnackbarStatusCallback snackbarStatus,
-    double barBlur = 0.0,
+    SnackbarStatusCallback? snackbarStatus,
+    double? barBlur = 0.0,
     double overlayBlur = 0.0,
     double overlayBlur = 0.0,
-    Color overlayColor,
-    Form userInputForm,
+    Color? overlayColor,
+    Form? userInputForm,
   }) async {
   }) async {
     final getBar = GetBar(
     final getBar = GetBar(
       snackbarStatus: snackbarStatus,
       snackbarStatus: snackbarStatus,
@@ -76,7 +76,7 @@ extension ExtensionSnackbar on GetInterface {
       onTap: onTap,
       onTap: onTap,
       isDismissible: isDismissible,
       isDismissible: isDismissible,
       dismissDirection: dismissDirection,
       dismissDirection: dismissDirection,
-      showProgressIndicator: showProgressIndicator ?? false,
+      showProgressIndicator: showProgressIndicator,
       progressIndicatorController: progressIndicatorController,
       progressIndicatorController: progressIndicatorController,
       progressIndicatorBackgroundColor: progressIndicatorBackgroundColor,
       progressIndicatorBackgroundColor: progressIndicatorBackgroundColor,
       progressIndicatorValueColor: progressIndicatorValueColor,
       progressIndicatorValueColor: progressIndicatorValueColor,
@@ -92,56 +92,56 @@ extension ExtensionSnackbar on GetInterface {
     if (instantInit) {
     if (instantInit) {
       getBar.show();
       getBar.show();
     } else {
     } else {
-      SchedulerBinding.instance.addPostFrameCallback((_) {
+      SchedulerBinding.instance!.addPostFrameCallback((_) {
         getBar.show();
         getBar.show();
       });
       });
     }
     }
   }
   }
 
 
-  Future<T> showSnackbar<T>(GetBar snackbar) {
+  Future<T?>? showSnackbar<T>(GetBar snackbar) {
     return key?.currentState?.push(SnackRoute<T>(snack: snackbar));
     return key?.currentState?.push(SnackRoute<T>(snack: snackbar));
   }
   }
 
 
   void snackbar<T>(
   void snackbar<T>(
     String title,
     String title,
     String message, {
     String message, {
-    Color colorText,
-    Duration duration,
+    Color? colorText,
+    Duration? duration,
 
 
     /// with instantInit = false you can put snackbar on initState
     /// with instantInit = false you can put snackbar on initState
     bool instantInit = true,
     bool instantInit = true,
-    SnackPosition snackPosition,
-    Widget titleText,
-    Widget messageText,
-    Widget icon,
-    bool shouldIconPulse,
-    double maxWidth,
-    EdgeInsets margin,
-    EdgeInsets padding,
-    double borderRadius,
-    Color borderColor,
-    double borderWidth,
-    Color backgroundColor,
-    Color leftBarIndicatorColor,
-    List<BoxShadow> boxShadows,
-    Gradient backgroundGradient,
-    TextButton mainButton,
-    OnTap onTap,
-    bool isDismissible,
-    bool showProgressIndicator,
-    SnackDismissDirection dismissDirection,
-    AnimationController progressIndicatorController,
-    Color progressIndicatorBackgroundColor,
-    Animation<Color> progressIndicatorValueColor,
-    SnackStyle snackStyle,
-    Curve forwardAnimationCurve,
-    Curve reverseAnimationCurve,
-    Duration animationDuration,
-    double barBlur,
-    double overlayBlur,
-    SnackbarStatusCallback snackbarStatus,
-    Color overlayColor,
-    Form userInputForm,
+    SnackPosition? snackPosition,
+    Widget? titleText,
+    Widget? messageText,
+    Widget? icon,
+    bool? shouldIconPulse,
+    double? maxWidth,
+    EdgeInsets? margin,
+    EdgeInsets? padding,
+    double? borderRadius,
+    Color? borderColor,
+    double? borderWidth,
+    Color? backgroundColor,
+    Color? leftBarIndicatorColor,
+    List<BoxShadow>? boxShadows,
+    Gradient? backgroundGradient,
+    TextButton? mainButton,
+    OnTap? onTap,
+    bool? isDismissible,
+    bool? showProgressIndicator,
+    SnackDismissDirection? dismissDirection,
+    AnimationController? progressIndicatorController,
+    Color? progressIndicatorBackgroundColor,
+    Animation<Color>? progressIndicatorValueColor,
+    SnackStyle? snackStyle,
+    Curve? forwardAnimationCurve,
+    Curve? reverseAnimationCurve,
+    Duration? animationDuration,
+    double? barBlur,
+    double? overlayBlur,
+    SnackbarStatusCallback? snackbarStatus,
+    Color? overlayColor,
+    Form? userInputForm,
   }) async {
   }) async {
     final getBar = GetBar(
     final getBar = GetBar(
         snackbarStatus: snackbarStatus,
         snackbarStatus: snackbarStatus,
@@ -200,7 +200,7 @@ extension ExtensionSnackbar on GetInterface {
       showSnackbar<T>(getBar);
       showSnackbar<T>(getBar);
     } else {
     } else {
       routing.isSnackbar = true;
       routing.isSnackbar = true;
-      SchedulerBinding.instance.addPostFrameCallback((_) {
+      SchedulerBinding.instance!.addPostFrameCallback((_) {
         showSnackbar<T>(getBar);
         showSnackbar<T>(getBar);
       });
       });
     }
     }
@@ -212,26 +212,26 @@ extension ExtensionDialog on GetInterface {
   /// You can pass a [transitionDuration] and/or [transitionCurve],
   /// You can pass a [transitionDuration] and/or [transitionCurve],
   /// overriding the defaults when the dialog shows up and closes.
   /// overriding the defaults when the dialog shows up and closes.
   /// When the dialog closes, uses those animations in reverse.
   /// When the dialog closes, uses those animations in reverse.
-  Future<T> dialog<T>(
+  Future<T?> dialog<T>(
     Widget widget, {
     Widget widget, {
     bool barrierDismissible = true,
     bool barrierDismissible = true,
-    Color barrierColor,
+    Color? barrierColor,
     bool useSafeArea = true,
     bool useSafeArea = true,
     bool useRootNavigator = true,
     bool useRootNavigator = true,
-    Object arguments,
-    Duration transitionDuration,
-    Curve transitionCurve,
-    String name,
-    RouteSettings routeSettings,
+    Object? arguments,
+    Duration? transitionDuration,
+    Curve? transitionCurve,
+    String? name,
+    RouteSettings? routeSettings,
   }) {
   }) {
     assert(widget != null);
     assert(widget != null);
     assert(barrierDismissible != null);
     assert(barrierDismissible != null);
     assert(useSafeArea != null);
     assert(useSafeArea != null);
     assert(useRootNavigator != null);
     assert(useRootNavigator != null);
-    assert(debugCheckHasMaterialLocalizations(context));
+    assert(debugCheckHasMaterialLocalizations(context!));
 
 
     //  final theme = Theme.of(context, shadowThemeOnly: true);
     //  final theme = Theme.of(context, shadowThemeOnly: true);
-    final theme = Theme.of(context);
+    final theme = Theme.of(context!);
     return generalDialog<T>(
     return generalDialog<T>(
       pageBuilder: (buildContext, animation, secondaryAnimation) {
       pageBuilder: (buildContext, animation, secondaryAnimation) {
         final pageChild = widget;
         final pageChild = widget;
@@ -246,7 +246,7 @@ extension ExtensionDialog on GetInterface {
         return dialog;
         return dialog;
       },
       },
       barrierDismissible: barrierDismissible,
       barrierDismissible: barrierDismissible,
-      barrierLabel: MaterialLocalizations.of(context).modalBarrierDismissLabel,
+      barrierLabel: MaterialLocalizations.of(context!).modalBarrierDismissLabel,
       barrierColor: barrierColor ?? Colors.black54,
       barrierColor: barrierColor ?? Colors.black54,
       transitionDuration: transitionDuration ?? defaultDialogTransitionDuration,
       transitionDuration: transitionDuration ?? defaultDialogTransitionDuration,
       transitionBuilder: (context, animation, secondaryAnimation, child) {
       transitionBuilder: (context, animation, secondaryAnimation, child) {
@@ -265,20 +265,20 @@ extension ExtensionDialog on GetInterface {
   }
   }
 
 
   /// Api from showGeneralDialog with no context
   /// Api from showGeneralDialog with no context
-  Future<T> generalDialog<T>({
-    @required RoutePageBuilder pageBuilder,
+  Future<T?> generalDialog<T>({
+    required RoutePageBuilder pageBuilder,
     bool barrierDismissible = false,
     bool barrierDismissible = false,
-    String barrierLabel,
+    String? barrierLabel,
     Color barrierColor = const Color(0x80000000),
     Color barrierColor = const Color(0x80000000),
     Duration transitionDuration = const Duration(milliseconds: 200),
     Duration transitionDuration = const Duration(milliseconds: 200),
-    RouteTransitionsBuilder transitionBuilder,
+    RouteTransitionsBuilder? transitionBuilder,
     bool useRootNavigator = true,
     bool useRootNavigator = true,
-    RouteSettings routeSettings,
+    RouteSettings? routeSettings,
   }) {
   }) {
     assert(pageBuilder != null);
     assert(pageBuilder != null);
     assert(useRootNavigator != null);
     assert(useRootNavigator != null);
     assert(!barrierDismissible || barrierLabel != null);
     assert(!barrierDismissible || barrierLabel != null);
-    return Navigator.of(overlayContext, rootNavigator: useRootNavigator)
+    return Navigator.of(overlayContext!, rootNavigator: useRootNavigator)
         .push<T>(GetDialogRoute<T>(
         .push<T>(GetDialogRoute<T>(
       pageBuilder: pageBuilder,
       pageBuilder: pageBuilder,
       barrierDismissible: barrierDismissible,
       barrierDismissible: barrierDismissible,
@@ -291,32 +291,32 @@ extension ExtensionDialog on GetInterface {
   }
   }
 
 
   /// Custom UI Dialog.
   /// Custom UI Dialog.
-  Future<T> defaultDialog<T>({
+  Future<T?> defaultDialog<T>({
     String title = "Alert",
     String title = "Alert",
-    TextStyle titleStyle,
-    Widget content,
-    VoidCallback onConfirm,
-    VoidCallback onCancel,
-    VoidCallback onCustom,
-    Color cancelTextColor,
-    Color confirmTextColor,
-    String textConfirm,
-    String textCancel,
-    String textCustom,
-    Widget confirm,
-    Widget cancel,
-    Widget custom,
-    Color backgroundColor,
+    TextStyle? titleStyle,
+    Widget? content,
+    VoidCallback? onConfirm,
+    VoidCallback? onCancel,
+    VoidCallback? onCustom,
+    Color? cancelTextColor,
+    Color? confirmTextColor,
+    String? textConfirm,
+    String? textCancel,
+    String? textCustom,
+    Widget? confirm,
+    Widget? cancel,
+    Widget? custom,
+    Color? backgroundColor,
     bool barrierDismissible = true,
     bool barrierDismissible = true,
-    Color buttonColor,
+    Color? buttonColor,
     String middleText = "Dialog made in 3 lines of code",
     String middleText = "Dialog made in 3 lines of code",
-    TextStyle middleTextStyle,
+    TextStyle? middleTextStyle,
     double radius = 20.0,
     double radius = 20.0,
     //   ThemeData themeData,
     //   ThemeData themeData,
-    List<Widget> actions,
+    List<Widget>? actions,
 
 
     // onWillPop Scope
     // onWillPop Scope
-    WillPopCallback onWillPop,
+    WillPopCallback? onWillPop,
   }) {
   }) {
     var leanCancel = onCancel != null || textCancel != null;
     var leanCancel = onCancel != null || textCancel != null;
     var leanConfirm = onConfirm != null || textConfirm != null;
     var leanConfirm = onConfirm != null || textConfirm != null;
@@ -332,7 +332,7 @@ extension ExtensionDialog on GetInterface {
             padding: EdgeInsets.symmetric(horizontal: 10, vertical: 8),
             padding: EdgeInsets.symmetric(horizontal: 10, vertical: 8),
             shape: RoundedRectangleBorder(
             shape: RoundedRectangleBorder(
                 side: BorderSide(
                 side: BorderSide(
-                    color: buttonColor ?? theme.accentColor,
+                    color: buttonColor ?? theme!.accentColor,
                     width: 2,
                     width: 2,
                     style: BorderStyle.solid),
                     style: BorderStyle.solid),
                 borderRadius: BorderRadius.circular(100)),
                 borderRadius: BorderRadius.circular(100)),
@@ -343,7 +343,7 @@ extension ExtensionDialog on GetInterface {
           },
           },
           child: Text(
           child: Text(
             textCancel ?? "Cancel",
             textCancel ?? "Cancel",
-            style: TextStyle(color: cancelTextColor ?? theme.accentColor),
+            style: TextStyle(color: cancelTextColor ?? theme!.accentColor),
           ),
           ),
         ));
         ));
       }
       }
@@ -356,14 +356,14 @@ extension ExtensionDialog on GetInterface {
             style: TextButton.styleFrom(
             style: TextButton.styleFrom(
               tapTargetSize: MaterialTapTargetSize.shrinkWrap,
               tapTargetSize: MaterialTapTargetSize.shrinkWrap,
               //color: buttonColor ?? theme.accentColor,
               //color: buttonColor ?? theme.accentColor,
-              backgroundColor: buttonColor ?? theme.accentColor,
+              backgroundColor: buttonColor ?? theme!.accentColor,
               shape: RoundedRectangleBorder(
               shape: RoundedRectangleBorder(
                   borderRadius: BorderRadius.circular(100)),
                   borderRadius: BorderRadius.circular(100)),
             ),
             ),
             child: Text(
             child: Text(
               textConfirm ?? "Ok",
               textConfirm ?? "Ok",
               style:
               style:
-                  TextStyle(color: confirmTextColor ?? theme.backgroundColor),
+                  TextStyle(color: confirmTextColor ?? theme!.backgroundColor),
             ),
             ),
             onPressed: () {
             onPressed: () {
               onConfirm?.call();
               onConfirm?.call();
@@ -374,7 +374,7 @@ extension ExtensionDialog on GetInterface {
     Widget baseAlertDialog = AlertDialog(
     Widget baseAlertDialog = AlertDialog(
       titlePadding: EdgeInsets.all(8),
       titlePadding: EdgeInsets.all(8),
       contentPadding: EdgeInsets.all(8),
       contentPadding: EdgeInsets.all(8),
-      backgroundColor: backgroundColor ?? theme.dialogBackgroundColor,
+      backgroundColor: backgroundColor ?? theme!.dialogBackgroundColor,
       shape: RoundedRectangleBorder(
       shape: RoundedRectangleBorder(
           borderRadius: BorderRadius.all(Radius.circular(radius))),
           borderRadius: BorderRadius.all(Radius.circular(radius))),
       title: Text(title, textAlign: TextAlign.center, style: titleStyle),
       title: Text(title, textAlign: TextAlign.center, style: titleStyle),
@@ -420,22 +420,22 @@ extension ExtensionDialog on GetInterface {
 }
 }
 
 
 extension ExtensionBottomSheet on GetInterface {
 extension ExtensionBottomSheet on GetInterface {
-  Future<T> bottomSheet<T>(
+  Future<T?> bottomSheet<T>(
     Widget bottomsheet, {
     Widget bottomsheet, {
-    Color backgroundColor,
-    double elevation,
+    Color? backgroundColor,
+    double? elevation,
     bool persistent = true,
     bool persistent = true,
-    ShapeBorder shape,
-    Clip clipBehavior,
-    Color barrierColor,
-    bool ignoreSafeArea,
+    ShapeBorder? shape,
+    Clip? clipBehavior,
+    Color? barrierColor,
+    bool? ignoreSafeArea,
     bool isScrollControlled = false,
     bool isScrollControlled = false,
     bool useRootNavigator = false,
     bool useRootNavigator = false,
     bool isDismissible = true,
     bool isDismissible = true,
     bool enableDrag = true,
     bool enableDrag = true,
-    RouteSettings settings,
-    Duration enterBottomSheetDuration,
-    Duration exitBottomSheetDuration,
+    RouteSettings? settings,
+    Duration? enterBottomSheetDuration,
+    Duration? exitBottomSheetDuration,
   }) {
   }) {
     assert(bottomsheet != null);
     assert(bottomsheet != null);
     assert(persistent != null);
     assert(persistent != null);
@@ -444,15 +444,15 @@ extension ExtensionBottomSheet on GetInterface {
     assert(isDismissible != null);
     assert(isDismissible != null);
     assert(enableDrag != null);
     assert(enableDrag != null);
 
 
-    return Navigator.of(overlayContext, rootNavigator: useRootNavigator)
+    return Navigator.of(overlayContext!, rootNavigator: useRootNavigator)
         .push(GetModalBottomSheetRoute<T>(
         .push(GetModalBottomSheetRoute<T>(
       builder: (_) => bottomsheet,
       builder: (_) => bottomsheet,
       isPersistent: persistent,
       isPersistent: persistent,
       // theme: Theme.of(key.currentContext, shadowThemeOnly: true),
       // theme: Theme.of(key.currentContext, shadowThemeOnly: true),
-      theme: Theme.of(key.currentContext),
+      theme: Theme.of(key!.currentContext!),
       isScrollControlled: isScrollControlled,
       isScrollControlled: isScrollControlled,
-      barrierLabel:
-          MaterialLocalizations.of(key.currentContext).modalBarrierDismissLabel,
+      barrierLabel: MaterialLocalizations.of(key!.currentContext!)
+          .modalBarrierDismissLabel,
       backgroundColor: backgroundColor ?? Colors.transparent,
       backgroundColor: backgroundColor ?? Colors.transparent,
       elevation: elevation,
       elevation: elevation,
       shape: shape,
       shape: shape,
@@ -491,18 +491,18 @@ extension GetNavigation on GetInterface {
   ///
   ///
   /// By default, GetX will prevent you from push a route that you already in,
   /// By default, GetX will prevent you from push a route that you already in,
   /// if you want to push anyway, set [preventDuplicates] to false
   /// if you want to push anyway, set [preventDuplicates] to false
-  Future<T> to<T>(
+  Future<T?>? to<T>(
     dynamic page, {
     dynamic page, {
-    bool opaque,
-    Transition transition,
-    Curve curve,
-    Duration duration,
-    int id,
+    bool? opaque,
+    Transition? transition,
+    Curve? curve,
+    Duration? duration,
+    int? id,
     bool fullscreenDialog = false,
     bool fullscreenDialog = false,
     dynamic arguments,
     dynamic arguments,
-    Bindings binding,
+    Bindings? binding,
     bool preventDuplicates = true,
     bool preventDuplicates = true,
-    bool popGesture,
+    bool? popGesture,
   }) {
   }) {
     var routeName = "/${page.runtimeType.toString()}";
     var routeName = "/${page.runtimeType.toString()}";
     if (preventDuplicates && routeName == currentRoute) {
     if (preventDuplicates && routeName == currentRoute) {
@@ -558,12 +558,12 @@ you can only use widgets and widget functions here''';
   /// if you want to push anyway, set [preventDuplicates] to false
   /// if you want to push anyway, set [preventDuplicates] to false
   ///
   ///
   /// Note: Always put a slash on the route ('/page1'), to avoid unnexpected errors
   /// Note: Always put a slash on the route ('/page1'), to avoid unnexpected errors
-  Future<T> toNamed<T>(
+  Future<T?>? toNamed<T>(
     String page, {
     String page, {
     dynamic arguments,
     dynamic arguments,
-    int id,
+    int? id,
     bool preventDuplicates = true,
     bool preventDuplicates = true,
-    Map<String, String> parameters,
+    Map<String, String>? parameters,
   }) {
   }) {
     if (preventDuplicates && page == currentRoute) {
     if (preventDuplicates && page == currentRoute) {
       return null;
       return null;
@@ -596,12 +596,12 @@ you can only use widgets and widget functions here''';
   /// if you want to push anyway, set [preventDuplicates] to false
   /// if you want to push anyway, set [preventDuplicates] to false
   ///
   ///
   /// Note: Always put a slash on the route ('/page1'), to avoid unnexpected errors
   /// Note: Always put a slash on the route ('/page1'), to avoid unnexpected errors
-  Future<T> offNamed<T>(
+  Future<T?>? offNamed<T>(
     String page, {
     String page, {
     dynamic arguments,
     dynamic arguments,
-    int id,
+    int? id,
     bool preventDuplicates = true,
     bool preventDuplicates = true,
-    Map<String, String> parameters,
+    Map<String, String>? parameters,
   }) {
   }) {
     if (preventDuplicates && page == currentRoute) {
     if (preventDuplicates && page == currentRoute) {
       return null;
       return null;
@@ -630,7 +630,7 @@ you can only use widgets and widget functions here''';
   /// or also like this:
   /// or also like this:
   /// `Get.until((route) => !Get.isDialogOpen())`, to make sure the
   /// `Get.until((route) => !Get.isDialogOpen())`, to make sure the
   /// dialog is closed
   /// dialog is closed
-  void until(RoutePredicate predicate, {int id}) {
+  void until(RoutePredicate predicate, {int? id}) {
     // if (key.currentState.mounted) // add this if appear problems on future with route navigate
     // if (key.currentState.mounted) // add this if appear problems on future with route navigate
     // when widget don't mounted
     // when widget don't mounted
     return global(id)?.currentState?.popUntil(predicate);
     return global(id)?.currentState?.popUntil(predicate);
@@ -654,7 +654,7 @@ you can only use widgets and widget functions here''';
   /// or also like this:
   /// or also like this:
   /// `Get.until((route) => !Get.isDialogOpen())`, to make sure the dialog
   /// `Get.until((route) => !Get.isDialogOpen())`, to make sure the dialog
   /// is closed
   /// is closed
-  Future<T> offUntil<T>(Route<T> page, RoutePredicate predicate, {int id}) {
+  Future<T?>? offUntil<T>(Route<T> page, RoutePredicate predicate, {int? id}) {
     // if (key.currentState.mounted) // add this if appear problems on future with route navigate
     // if (key.currentState.mounted) // add this if appear problems on future with route navigate
     // when widget don't mounted
     // when widget don't mounted
     return global(id)?.currentState?.pushAndRemoveUntil<T>(page, predicate);
     return global(id)?.currentState?.pushAndRemoveUntil<T>(page, predicate);
@@ -678,12 +678,12 @@ you can only use widgets and widget functions here''';
   /// to make sure the dialog is closed
   /// to make sure the dialog is closed
   ///
   ///
   /// Note: Always put a slash on the route name ('/page1'), to avoid unexpected errors
   /// Note: Always put a slash on the route name ('/page1'), to avoid unexpected errors
-  Future<T> offNamedUntil<T>(
+  Future<T?>? offNamedUntil<T>(
     String page,
     String page,
     RoutePredicate predicate, {
     RoutePredicate predicate, {
-    int id,
+    int? id,
     dynamic arguments,
     dynamic arguments,
-    Map<String, String> parameters,
+    Map<String, String>? parameters,
   }) {
   }) {
     if (parameters != null) {
     if (parameters != null) {
       final uri = Uri(path: page, queryParameters: parameters);
       final uri = Uri(path: page, queryParameters: parameters);
@@ -708,12 +708,12 @@ you can only use widgets and widget functions here''';
   /// The `offNamed()` pop a page, and goes to the next. The
   /// The `offNamed()` pop a page, and goes to the next. The
   /// `offAndToNamed()` goes to the next page, and removes the previous one.
   /// `offAndToNamed()` goes to the next page, and removes the previous one.
   /// The route transition animation is different.
   /// The route transition animation is different.
-  Future<T> offAndToNamed<T>(
+  Future<T?>? offAndToNamed<T>(
     String page, {
     String page, {
     dynamic arguments,
     dynamic arguments,
-    int id,
+    int? id,
     dynamic result,
     dynamic result,
-    Map<String, String> parameters,
+    Map<String, String>? parameters,
   }) {
   }) {
     if (parameters != null) {
     if (parameters != null) {
       final uri = Uri(path: page, queryParameters: parameters);
       final uri = Uri(path: page, queryParameters: parameters);
@@ -732,7 +732,7 @@ you can only use widgets and widget functions here''';
   ///
   ///
   /// [id] is for when you are using nested navigation,
   /// [id] is for when you are using nested navigation,
   /// as explained in documentation
   /// as explained in documentation
-  void removeRoute(Route<dynamic> route, {int id}) {
+  void removeRoute(Route<dynamic> route, {int? id}) {
     return global(id)?.currentState?.removeRoute(route);
     return global(id)?.currentState?.removeRoute(route);
   }
   }
 
 
@@ -756,12 +756,12 @@ you can only use widgets and widget functions here''';
   /// as explained in documentation
   /// as explained in documentation
   ///
   ///
   /// Note: Always put a slash on the route ('/page1'), to avoid unexpected errors
   /// Note: Always put a slash on the route ('/page1'), to avoid unexpected errors
-  Future<T> offAllNamed<T>(
+  Future<T?>? offAllNamed<T>(
     String newRouteName, {
     String newRouteName, {
-    RoutePredicate predicate,
+    RoutePredicate? predicate,
     dynamic arguments,
     dynamic arguments,
-    int id,
-    Map<String, String> parameters,
+    int? id,
+    Map<String, String>? parameters,
   }) {
   }) {
     if (parameters != null) {
     if (parameters != null) {
       final uri = Uri(path: newRouteName, queryParameters: parameters);
       final uri = Uri(path: newRouteName, queryParameters: parameters);
@@ -777,11 +777,11 @@ you can only use widgets and widget functions here''';
 
 
   /// Returns true if a Snackbar, Dialog or BottomSheet is currently OPEN
   /// Returns true if a Snackbar, Dialog or BottomSheet is currently OPEN
   bool get isOverlaysOpen =>
   bool get isOverlaysOpen =>
-      (isSnackbarOpen || isDialogOpen || isBottomSheetOpen);
+      (isSnackbarOpen! || isDialogOpen! || isBottomSheetOpen!);
 
 
   /// Returns true if there is no Snackbar, Dialog or BottomSheet open
   /// Returns true if there is no Snackbar, Dialog or BottomSheet open
   bool get isOverlaysClosed =>
   bool get isOverlaysClosed =>
-      (!isSnackbarOpen && !isDialogOpen && !isBottomSheetOpen);
+      (!isSnackbarOpen! && !isDialogOpen! && !isBottomSheetOpen!);
 
 
   /// **Navigation.popUntil()** shortcut.<br><br>
   /// **Navigation.popUntil()** shortcut.<br><br>
   ///
   ///
@@ -796,10 +796,10 @@ you can only use widgets and widget functions here''';
   /// It has the advantage of not needing context, so you can call
   /// It has the advantage of not needing context, so you can call
   /// from your business logic.
   /// from your business logic.
   void back<T>({
   void back<T>({
-    T result,
+    T? result,
     bool closeOverlays = false,
     bool closeOverlays = false,
     bool canPop = true,
     bool canPop = true,
-    int id,
+    int? id,
   }) {
   }) {
     if (closeOverlays && isOverlaysOpen) {
     if (closeOverlays && isOverlaysOpen) {
       navigator?.popUntil((route) {
       navigator?.popUntil((route) {
@@ -821,7 +821,7 @@ you can only use widgets and widget functions here''';
   ///
   ///
   /// [id] is for when you are using nested navigation,
   /// [id] is for when you are using nested navigation,
   /// as explained in documentation
   /// as explained in documentation
-  void close(int times, [int id]) {
+  void close(int times, [int? id]) {
     if ((times == null) || (times < 1)) {
     if ((times == null) || (times < 1)) {
       times = 1;
       times = 1;
     }
     }
@@ -856,18 +856,18 @@ you can only use widgets and widget functions here''';
   ///
   ///
   /// By default, GetX will prevent you from push a route that you already in,
   /// By default, GetX will prevent you from push a route that you already in,
   /// if you want to push anyway, set [preventDuplicates] to false
   /// if you want to push anyway, set [preventDuplicates] to false
-  Future<T> off<T>(
+  Future<T?>? off<T>(
     dynamic page, {
     dynamic page, {
     bool opaque = false,
     bool opaque = false,
-    Transition transition,
-    Curve curve,
-    bool popGesture,
-    int id,
+    Transition? transition,
+    Curve? curve,
+    bool? popGesture,
+    int? id,
     dynamic arguments,
     dynamic arguments,
-    Bindings binding,
+    Bindings? binding,
     bool fullscreenDialog = false,
     bool fullscreenDialog = false,
     bool preventDuplicates = true,
     bool preventDuplicates = true,
-    Duration duration,
+    Duration? duration,
   }) {
   }) {
     var routeName = "/${page.runtimeType.toString()}";
     var routeName = "/${page.runtimeType.toString()}";
     if (preventDuplicates && routeName == currentRoute) {
     if (preventDuplicates && routeName == currentRoute) {
@@ -917,18 +917,18 @@ you can only use widgets and widget functions here''';
   ///
   ///
   /// By default, GetX will prevent you from push a route that you already in,
   /// By default, GetX will prevent you from push a route that you already in,
   /// if you want to push anyway, set [preventDuplicates] to false
   /// if you want to push anyway, set [preventDuplicates] to false
-  Future<T> offAll<T>(
+  Future<T?>? offAll<T>(
     dynamic page, {
     dynamic page, {
-    RoutePredicate predicate,
+    RoutePredicate? predicate,
     bool opaque = false,
     bool opaque = false,
-    bool popGesture,
-    int id,
+    bool? popGesture,
+    int? id,
     dynamic arguments,
     dynamic arguments,
-    Bindings binding,
+    Bindings? binding,
     bool fullscreenDialog = false,
     bool fullscreenDialog = false,
-    Transition transition,
-    Curve curve,
-    Duration duration,
+    Transition? transition,
+    Curve? curve,
+    Duration? duration,
   }) {
   }) {
     var routeName = "/${page.runtimeType.toString()}";
     var routeName = "/${page.runtimeType.toString()}";
 
 
@@ -948,32 +948,32 @@ you can only use widgets and widget functions here''';
         predicate ?? (route) => false);
         predicate ?? (route) => false);
   }
   }
 
 
-  void addPages(List<GetPage> getPages) {
+  void addPages(List<GetPage>? getPages) {
     if (getPages != null) {
     if (getPages != null) {
       if (routeTree == null) {
       if (routeTree == null) {
         routeTree = ParseRouteTree();
         routeTree = ParseRouteTree();
       }
       }
 
 
-      routeTree.addRoutes(getPages);
+      routeTree!.addRoutes(getPages);
     }
     }
   }
   }
 
 
   void addPage(GetPage getPage) {
   void addPage(GetPage getPage) {
     if (getPage != null) {
     if (getPage != null) {
       if (routeTree == null) routeTree = ParseRouteTree();
       if (routeTree == null) routeTree = ParseRouteTree();
-      routeTree.addRoute(getPage);
+      routeTree!.addRoute(getPage);
     }
     }
   }
   }
 
 
   /// change default config of Get
   /// change default config of Get
   void config(
   void config(
-      {bool enableLog,
-      LogWriterCallback logWriterCallback,
-      bool defaultPopGesture,
-      bool defaultOpaqueRoute,
-      Duration defaultDurationTransition,
-      bool defaultGlobalState,
-      Transition defaultTransition}) {
+      {bool? enableLog,
+      LogWriterCallback? logWriterCallback,
+      bool? defaultPopGesture,
+      bool? defaultOpaqueRoute,
+      Duration? defaultDurationTransition,
+      bool? defaultGlobalState,
+      Transition? defaultTransition}) {
     if (enableLog != null) {
     if (enableLog != null) {
       Get.isLogEnable = enableLog;
       Get.isLogEnable = enableLog;
     }
     }
@@ -1014,7 +1014,7 @@ you can only use widgets and widget functions here''';
   /// Your entire application will be rebuilt, and touch events will not
   /// Your entire application will be rebuilt, and touch events will not
   /// work until the end of rendering.
   /// work until the end of rendering.
   void forceAppUpdate() {
   void forceAppUpdate() {
-    engine.performReassemble();
+    engine!.performReassemble();
   }
   }
 
 
   void appUpdate() => getxController.update();
   void appUpdate() => getxController.update();
@@ -1027,18 +1027,18 @@ you can only use widgets and widget functions here''';
     getxController.setThemeMode(themeMode);
     getxController.setThemeMode(themeMode);
   }
   }
 
 
-  GlobalKey<NavigatorState> addKey(GlobalKey<NavigatorState> newKey) {
+  GlobalKey<NavigatorState>? addKey(GlobalKey<NavigatorState>? newKey) {
     getxController.key = newKey;
     getxController.key = newKey;
     return key;
     return key;
   }
   }
 
 
-  GlobalKey<NavigatorState> nestedKey(int key) {
+  GlobalKey<NavigatorState>? nestedKey(int key) {
     keys.putIfAbsent(key, () => GlobalKey<NavigatorState>());
     keys.putIfAbsent(key, () => GlobalKey<NavigatorState>());
     return keys[key];
     return keys[key];
   }
   }
 
 
-  GlobalKey<NavigatorState> global(int k) {
-    GlobalKey<NavigatorState> _key;
+  GlobalKey<NavigatorState>? global(int? k) {
+    GlobalKey<NavigatorState>? _key;
     if (k == null) {
     if (k == null) {
       _key = key;
       _key = key;
     } else {
     } else {
@@ -1048,7 +1048,7 @@ you can only use widgets and widget functions here''';
       _key = keys[k];
       _key = keys[k];
     }
     }
 
 
-    if (_key.currentContext == null && !testMode) {
+    if (_key!.currentContext == null && !testMode) {
       throw """You are trying to use contextless navigation without
       throw """You are trying to use contextless navigation without
       a GetMaterialApp or Get.key.
       a GetMaterialApp or Get.key.
       If you are testing your app, you can use:
       If you are testing your app, you can use:
@@ -1065,7 +1065,7 @@ you can only use widgets and widget functions here''';
 Since version 2.8 it is possible to access the properties 
 Since version 2.8 it is possible to access the properties 
 [Get.arguments] and [Get.currentRoute] directly. 
 [Get.arguments] and [Get.currentRoute] directly. 
 [routeSettings] is useless and should not be used.''')
 [routeSettings] is useless and should not be used.''')
-  RouteSettings get routeSettings => null;
+  RouteSettings? get routeSettings => null;
 
 
   /// give current arguments
   /// give current arguments
   dynamic get arguments => routing.args;
   dynamic get arguments => routing.args;
@@ -1077,16 +1077,16 @@ Since version 2.8 it is possible to access the properties
   String get previousRoute => routing.previous;
   String get previousRoute => routing.previous;
 
 
   /// check if snackbar is open
   /// check if snackbar is open
-  bool get isSnackbarOpen => routing.isSnackbar;
+  bool? get isSnackbarOpen => routing.isSnackbar;
 
 
   /// check if dialog is open
   /// check if dialog is open
-  bool get isDialogOpen => routing.isDialog;
+  bool? get isDialogOpen => routing.isDialog;
 
 
   /// check if bottomsheet is open
   /// check if bottomsheet is open
-  bool get isBottomSheetOpen => routing.isBottomSheet;
+  bool? get isBottomSheetOpen => routing.isBottomSheet;
 
 
   /// check a raw current route
   /// check a raw current route
-  Route<dynamic> get rawRoute => routing.route;
+  Route<dynamic>? get rawRoute => routing.route;
 
 
   /// check if popGesture is enable
   /// check if popGesture is enable
   bool get isPopGestureEnable => defaultPopGesture;
   bool get isPopGestureEnable => defaultPopGesture;
@@ -1095,11 +1095,11 @@ Since version 2.8 it is possible to access the properties
   bool get isOpaqueRouteDefault => defaultOpaqueRoute;
   bool get isOpaqueRouteDefault => defaultOpaqueRoute;
 
 
   /// give access to currentContext
   /// give access to currentContext
-  BuildContext get context => key?.currentContext;
+  BuildContext? get context => key?.currentContext;
 
 
   /// give access to current Overlay Context
   /// give access to current Overlay Context
-  BuildContext get overlayContext {
-    BuildContext overlay;
+  BuildContext? get overlayContext {
+    BuildContext? overlay;
     key?.currentState?.overlay?.context?.visitChildElements((element) {
     key?.currentState?.overlay?.context?.visitChildElements((element) {
       overlay = element;
       overlay = element;
     });
     });
@@ -1107,16 +1107,16 @@ Since version 2.8 it is possible to access the properties
   }
   }
 
 
   /// give access to Theme.of(context)
   /// give access to Theme.of(context)
-  ThemeData get theme {
-    ThemeData _theme;
+  ThemeData? get theme {
+    ThemeData? _theme;
     if (context != null) {
     if (context != null) {
-      _theme = Theme.of(context);
+      _theme = Theme.of(context!);
     }
     }
     return _theme;
     return _theme;
   }
   }
 
 
   ///The current [WidgetsBinding]
   ///The current [WidgetsBinding]
-  WidgetsBinding get engine {
+  WidgetsBinding? get engine {
     if (WidgetsBinding.instance == null) {
     if (WidgetsBinding.instance == null) {
       WidgetsFlutterBinding();
       WidgetsFlutterBinding();
     }
     }
@@ -1153,23 +1153,23 @@ Since version 2.8 it is possible to access the properties
   double get textScaleFactor => ui.window.textScaleFactor;
   double get textScaleFactor => ui.window.textScaleFactor;
 
 
   /// give access to TextTheme.of(context)
   /// give access to TextTheme.of(context)
-  TextTheme get textTheme => theme?.textTheme;
+  TextTheme? get textTheme => theme?.textTheme;
 
 
   /// give access to Mediaquery.of(context)
   /// give access to Mediaquery.of(context)
-  MediaQueryData get mediaQuery => MediaQuery.of(context);
+  MediaQueryData get mediaQuery => MediaQuery.of(context!);
 
 
   /// Check if dark mode theme is enable
   /// Check if dark mode theme is enable
-  bool get isDarkMode => (theme.brightness == Brightness.dark);
+  bool get isDarkMode => (theme!.brightness == Brightness.dark);
 
 
   /// Check if dark mode theme is enable on platform on android Q+
   /// Check if dark mode theme is enable on platform on android Q+
   bool get isPlatformDarkMode =>
   bool get isPlatformDarkMode =>
       (ui.window.platformBrightness == Brightness.dark);
       (ui.window.platformBrightness == Brightness.dark);
 
 
   /// give access to Theme.of(context).iconTheme.color
   /// give access to Theme.of(context).iconTheme.color
-  Color get iconColor => theme?.iconTheme?.color;
+  Color? get iconColor => theme?.iconTheme?.color;
 
 
   /// give access to FocusScope.of(context)
   /// give access to FocusScope.of(context)
-  FocusNode get focusScope => FocusManager.instance.primaryFocus;
+  FocusNode? get focusScope => FocusManager.instance.primaryFocus;
 
 
   // /// give access to Immutable MediaQuery.of(context).size.height
   // /// give access to Immutable MediaQuery.of(context).size.height
   // double get height => MediaQuery.of(context).size.height;
   // double get height => MediaQuery.of(context).size.height;
@@ -1177,16 +1177,16 @@ Since version 2.8 it is possible to access the properties
   // /// give access to Immutable MediaQuery.of(context).size.width
   // /// give access to Immutable MediaQuery.of(context).size.width
   // double get width => MediaQuery.of(context).size.width;
   // double get width => MediaQuery.of(context).size.width;
 
 
-  GlobalKey<NavigatorState> get key => getxController?.key;
+  GlobalKey<NavigatorState>? get key => getxController.key;
 
 
-  Map<int, GlobalKey<NavigatorState>> get keys => getxController?.keys;
+  Map<int, GlobalKey<NavigatorState>> get keys => getxController.keys;
 
 
   GetMaterialController get rootController => getxController;
   GetMaterialController get rootController => getxController;
 
 
   bool get defaultPopGesture => getxController.defaultPopGesture;
   bool get defaultPopGesture => getxController.defaultPopGesture;
   bool get defaultOpaqueRoute => getxController.defaultOpaqueRoute;
   bool get defaultOpaqueRoute => getxController.defaultOpaqueRoute;
 
 
-  Transition get defaultTransition => getxController.defaultTransition;
+  Transition? get defaultTransition => getxController.defaultTransition;
 
 
   Duration get defaultTransitionDuration {
   Duration get defaultTransitionDuration {
     return getxController.defaultTransitionDuration;
     return getxController.defaultTransitionDuration;
@@ -1204,15 +1204,15 @@ Since version 2.8 it is possible to access the properties
 
 
   Routing get routing => getxController.routing;
   Routing get routing => getxController.routing;
 
 
-  Map<String, String> get parameters => getxController.parameters;
-  set parameters(Map<String, String> newParameters) =>
+  Map<String?, String> get parameters => getxController.parameters;
+  set parameters(Map<String?, String> newParameters) =>
       getxController.parameters = newParameters;
       getxController.parameters = newParameters;
 
 
   ParseRouteTree get routeTree => getxController.routeTree;
   ParseRouteTree get routeTree => getxController.routeTree;
   set routeTree(ParseRouteTree tree) => getxController.routeTree = tree;
   set routeTree(ParseRouteTree tree) => getxController.routeTree = tree;
 
 
-  CustomTransition get customTransition => getxController.customTransition;
-  set customTransition(CustomTransition newTransition) =>
+  CustomTransition? get customTransition => getxController.customTransition;
+  set customTransition(CustomTransition? newTransition) =>
       getxController.customTransition = newTransition;
       getxController.customTransition = newTransition;
 
 
   bool get testMode => getxController.testMode;
   bool get testMode => getxController.testMode;
@@ -1224,4 +1224,4 @@ Since version 2.8 it is possible to access the properties
 /// It replaces the Flutter Navigator, but needs no context.
 /// It replaces the Flutter Navigator, but needs no context.
 /// You can to use navigator.push(YourRoute()) rather
 /// You can to use navigator.push(YourRoute()) rather
 /// Navigator.push(context, YourRoute());
 /// Navigator.push(context, YourRoute());
-NavigatorState get navigator => GetNavigation(Get).key.currentState;
+NavigatorState? get navigator => GetNavigation(Get).key!.currentState;

@@ -10,16 +10,16 @@ import 'root_controller.dart';
 
 
 class GetCupertinoApp extends StatelessWidget {
 class GetCupertinoApp extends StatelessWidget {
   const GetCupertinoApp({
   const GetCupertinoApp({
-    Key key,
+    Key? key,
     this.theme,
     this.theme,
     this.navigatorKey,
     this.navigatorKey,
     this.home,
     this.home,
-    this.routes = const <String, WidgetBuilder>{},
+    Map<String, Widget Function(BuildContext)> this.routes = const <String, WidgetBuilder>{},
     this.initialRoute,
     this.initialRoute,
     this.onGenerateRoute,
     this.onGenerateRoute,
     this.onGenerateInitialRoutes,
     this.onGenerateInitialRoutes,
     this.onUnknownRoute,
     this.onUnknownRoute,
-    this.navigatorObservers = const <NavigatorObserver>[],
+    List<NavigatorObserver> this.navigatorObservers = const <NavigatorObserver>[],
     this.builder,
     this.builder,
     this.translationsKeys,
     this.translationsKeys,
     this.translations,
     this.translations,
@@ -72,64 +72,64 @@ class GetCupertinoApp extends StatelessWidget {
         backButtonDispatcher = null,
         backButtonDispatcher = null,
         super(key: key);
         super(key: key);
 
 
-  final GlobalKey<NavigatorState> navigatorKey;
-  final Widget home;
-  final Map<String, WidgetBuilder> routes;
-  final String initialRoute;
-  final RouteFactory onGenerateRoute;
-  final InitialRouteListFactory onGenerateInitialRoutes;
-  final RouteFactory onUnknownRoute;
-  final List<NavigatorObserver> navigatorObservers;
-  final TransitionBuilder builder;
+  final GlobalKey<NavigatorState>? navigatorKey;
+  final Widget? home;
+  final Map<String, WidgetBuilder>? routes;
+  final String? initialRoute;
+  final RouteFactory? onGenerateRoute;
+  final InitialRouteListFactory? onGenerateInitialRoutes;
+  final RouteFactory? onUnknownRoute;
+  final List<NavigatorObserver>? navigatorObservers;
+  final TransitionBuilder? builder;
   final String title;
   final String title;
-  final GenerateAppTitle onGenerateTitle;
-  final CustomTransition customTransition;
-  final Color color;
-  final Map<String, Map<String, String>> translationsKeys;
-  final Translations translations;
-  final TextDirection textDirection;
-  final Locale locale;
-  final Locale fallbackLocale;
-  final Iterable<LocalizationsDelegate<dynamic>> localizationsDelegates;
-  final LocaleListResolutionCallback localeListResolutionCallback;
-  final LocaleResolutionCallback localeResolutionCallback;
+  final GenerateAppTitle? onGenerateTitle;
+  final CustomTransition? customTransition;
+  final Color? color;
+  final Map<String, Map<String, String>>? translationsKeys;
+  final Translations? translations;
+  final TextDirection? textDirection;
+  final Locale? locale;
+  final Locale? fallbackLocale;
+  final Iterable<LocalizationsDelegate<dynamic>>? localizationsDelegates;
+  final LocaleListResolutionCallback? localeListResolutionCallback;
+  final LocaleResolutionCallback? localeResolutionCallback;
   final Iterable<Locale> supportedLocales;
   final Iterable<Locale> supportedLocales;
   final bool showPerformanceOverlay;
   final bool showPerformanceOverlay;
   final bool checkerboardRasterCacheImages;
   final bool checkerboardRasterCacheImages;
   final bool checkerboardOffscreenLayers;
   final bool checkerboardOffscreenLayers;
   final bool showSemanticsDebugger;
   final bool showSemanticsDebugger;
   final bool debugShowCheckedModeBanner;
   final bool debugShowCheckedModeBanner;
-  final Map<LogicalKeySet, Intent> shortcuts;
-  final ThemeData highContrastTheme;
-  final ThemeData highContrastDarkTheme;
-  final Map<Type, Action<Intent>> actions;
-  final Function(Routing) routingCallback;
-  final Transition defaultTransition;
-  final bool opaqueRoute;
-  final VoidCallback onInit;
-  final VoidCallback onReady;
-  final VoidCallback onDispose;
-  final bool enableLog;
-  final LogWriterCallback logWriterCallback;
-  final bool popGesture;
+  final Map<LogicalKeySet, Intent>? shortcuts;
+  final ThemeData? highContrastTheme;
+  final ThemeData? highContrastDarkTheme;
+  final Map<Type, Action<Intent>>? actions;
+  final Function(Routing)? routingCallback;
+  final Transition? defaultTransition;
+  final bool? opaqueRoute;
+  final VoidCallback? onInit;
+  final VoidCallback? onReady;
+  final VoidCallback? onDispose;
+  final bool? enableLog;
+  final LogWriterCallback? logWriterCallback;
+  final bool? popGesture;
   final SmartManagement smartManagement;
   final SmartManagement smartManagement;
-  final Bindings initialBinding;
-  final Duration transitionDuration;
-  final bool defaultGlobalState;
-  final List<GetPage> getPages;
-  final GetPage unknownRoute;
-  final RouteInformationProvider routeInformationProvider;
-  final RouteInformationParser<Object> routeInformationParser;
-  final RouterDelegate<Object> routerDelegate;
-  final BackButtonDispatcher backButtonDispatcher;
-  final CupertinoThemeData theme;
+  final Bindings? initialBinding;
+  final Duration? transitionDuration;
+  final bool? defaultGlobalState;
+  final List<GetPage>? getPages;
+  final GetPage? unknownRoute;
+  final RouteInformationProvider? routeInformationProvider;
+  final RouteInformationParser<Object>? routeInformationParser;
+  final RouterDelegate<Object>? routerDelegate;
+  final BackButtonDispatcher? backButtonDispatcher;
+  final CupertinoThemeData? theme;
 
 
   const GetCupertinoApp.router({
   const GetCupertinoApp.router({
-    Key key,
+    Key? key,
     this.theme,
     this.theme,
     this.routeInformationProvider,
     this.routeInformationProvider,
-    @required this.routeInformationParser,
-    @required this.routerDelegate,
+    required RouteInformationParser<Object> this.routeInformationParser,
+    required RouterDelegate<Object> this.routerDelegate,
     this.backButtonDispatcher,
     this.backButtonDispatcher,
     this.builder,
     this.builder,
     this.title = '',
     this.title = '',
@@ -201,7 +201,7 @@ class GetCupertinoApp extends StatelessWidget {
         onDispose?.call();
         onDispose?.call();
       },
       },
       initState: (i) {
       initState: (i) {
-        Get.engine.addPostFrameCallback((timeStamp) {
+        Get.engine!.addPostFrameCallback((timeStamp) {
           onReady?.call();
           onReady?.call();
         });
         });
         if (locale != null) Get.locale = locale;
         if (locale != null) Get.locale = locale;
@@ -209,9 +209,9 @@ class GetCupertinoApp extends StatelessWidget {
         if (fallbackLocale != null) Get.fallbackLocale = fallbackLocale;
         if (fallbackLocale != null) Get.fallbackLocale = fallbackLocale;
 
 
         if (translations != null) {
         if (translations != null) {
-          Get.addTranslations(translations.keys);
+          Get.addTranslations(translations!.keys);
         } else if (translationsKeys != null) {
         } else if (translationsKeys != null) {
-          Get.addTranslations(translationsKeys);
+          Get.addTranslations(translationsKeys!);
         }
         }
 
 
         Get.customTransition = customTransition;
         Get.customTransition = customTransition;
@@ -233,8 +233,8 @@ class GetCupertinoApp extends StatelessWidget {
       },
       },
       builder: (_) => routerDelegate != null
       builder: (_) => routerDelegate != null
           ? CupertinoApp.router(
           ? CupertinoApp.router(
-              routerDelegate: routerDelegate,
-              routeInformationParser: routeInformationParser,
+              routerDelegate: routerDelegate!,
+              routeInformationParser: routeInformationParser!,
               backButtonDispatcher: backButtonDispatcher,
               backButtonDispatcher: backButtonDispatcher,
               routeInformationProvider: routeInformationProvider,
               routeInformationProvider: routeInformationProvider,
               key: _.unikey,
               key: _.unikey,
@@ -245,7 +245,7 @@ class GetCupertinoApp extends StatelessWidget {
                       (rtlLanguages.contains(Get.locale?.languageCode)
                       (rtlLanguages.contains(Get.locale?.languageCode)
                           ? TextDirection.rtl
                           ? TextDirection.rtl
                           : TextDirection.ltr),
                           : TextDirection.ltr),
-                  child: builder == null ? child : builder(context, child),
+                  child: builder == null ? child! : builder!(context, child),
                 );
                 );
               },
               },
               title: title ?? '',
               title: title ?? '',
@@ -285,14 +285,14 @@ class GetCupertinoApp extends StatelessWidget {
                   : <NavigatorObserver>[
                   : <NavigatorObserver>[
                       GetObserver(routingCallback, Get.routing)
                       GetObserver(routingCallback, Get.routing)
                     ]
                     ]
-                ..addAll(navigatorObservers)),
+                ..addAll(navigatorObservers!)),
               builder: (context, child) {
               builder: (context, child) {
                 return Directionality(
                 return Directionality(
                   textDirection: textDirection ??
                   textDirection: textDirection ??
                       (rtlLanguages.contains(Get.locale?.languageCode)
                       (rtlLanguages.contains(Get.locale?.languageCode)
                           ? TextDirection.rtl
                           ? TextDirection.rtl
                           : TextDirection.ltr),
                           : TextDirection.ltr),
-                  child: builder == null ? child : builder(context, child),
+                  child: builder == null ? child! : builder!(context, child),
                 );
                 );
               },
               },
               title: title ?? '',
               title: title ?? '',

@@ -10,15 +10,15 @@ import 'root_controller.dart';
 
 
 class GetMaterialApp extends StatelessWidget {
 class GetMaterialApp extends StatelessWidget {
   const GetMaterialApp({
   const GetMaterialApp({
-    Key key,
+    Key? key,
     this.navigatorKey,
     this.navigatorKey,
     this.home,
     this.home,
-    this.routes = const <String, WidgetBuilder>{},
+    Map<String, Widget Function(BuildContext)> this.routes = const <String, WidgetBuilder>{},
     this.initialRoute,
     this.initialRoute,
     this.onGenerateRoute,
     this.onGenerateRoute,
     this.onGenerateInitialRoutes,
     this.onGenerateInitialRoutes,
     this.onUnknownRoute,
     this.onUnknownRoute,
-    this.navigatorObservers = const <NavigatorObserver>[],
+    List<NavigatorObserver> this.navigatorObservers = const <NavigatorObserver>[],
     this.builder,
     this.builder,
     this.textDirection,
     this.textDirection,
     this.title = '',
     this.title = '',
@@ -76,66 +76,66 @@ class GetMaterialApp extends StatelessWidget {
         backButtonDispatcher = null,
         backButtonDispatcher = null,
         super(key: key);
         super(key: key);
 
 
-  final GlobalKey<NavigatorState> navigatorKey;
-  final Widget home;
-  final Map<String, WidgetBuilder> routes;
-  final String initialRoute;
-  final RouteFactory onGenerateRoute;
-  final InitialRouteListFactory onGenerateInitialRoutes;
-  final RouteFactory onUnknownRoute;
-  final List<NavigatorObserver> navigatorObservers;
-  final TransitionBuilder builder;
+  final GlobalKey<NavigatorState>? navigatorKey;
+  final Widget? home;
+  final Map<String, WidgetBuilder>? routes;
+  final String? initialRoute;
+  final RouteFactory? onGenerateRoute;
+  final InitialRouteListFactory? onGenerateInitialRoutes;
+  final RouteFactory? onUnknownRoute;
+  final List<NavigatorObserver>? navigatorObservers;
+  final TransitionBuilder? builder;
   final String title;
   final String title;
-  final GenerateAppTitle onGenerateTitle;
-  final ThemeData theme;
-  final ThemeData darkTheme;
+  final GenerateAppTitle? onGenerateTitle;
+  final ThemeData? theme;
+  final ThemeData? darkTheme;
   final ThemeMode themeMode;
   final ThemeMode themeMode;
-  final CustomTransition customTransition;
-  final Color color;
-  final Map<String, Map<String, String>> translationsKeys;
-  final Translations translations;
-  final TextDirection textDirection;
-  final Locale locale;
-  final Locale fallbackLocale;
-  final Iterable<LocalizationsDelegate<dynamic>> localizationsDelegates;
-  final LocaleListResolutionCallback localeListResolutionCallback;
-  final LocaleResolutionCallback localeResolutionCallback;
+  final CustomTransition? customTransition;
+  final Color? color;
+  final Map<String, Map<String, String>>? translationsKeys;
+  final Translations? translations;
+  final TextDirection? textDirection;
+  final Locale? locale;
+  final Locale? fallbackLocale;
+  final Iterable<LocalizationsDelegate<dynamic>>? localizationsDelegates;
+  final LocaleListResolutionCallback? localeListResolutionCallback;
+  final LocaleResolutionCallback? localeResolutionCallback;
   final Iterable<Locale> supportedLocales;
   final Iterable<Locale> supportedLocales;
   final bool showPerformanceOverlay;
   final bool showPerformanceOverlay;
   final bool checkerboardRasterCacheImages;
   final bool checkerboardRasterCacheImages;
   final bool checkerboardOffscreenLayers;
   final bool checkerboardOffscreenLayers;
   final bool showSemanticsDebugger;
   final bool showSemanticsDebugger;
   final bool debugShowCheckedModeBanner;
   final bool debugShowCheckedModeBanner;
-  final Map<LogicalKeySet, Intent> shortcuts;
-  final ThemeData highContrastTheme;
-  final ThemeData highContrastDarkTheme;
-  final Map<Type, Action<Intent>> actions;
+  final Map<LogicalKeySet, Intent>? shortcuts;
+  final ThemeData? highContrastTheme;
+  final ThemeData? highContrastDarkTheme;
+  final Map<Type, Action<Intent>>? actions;
   final bool debugShowMaterialGrid;
   final bool debugShowMaterialGrid;
-  final ValueChanged<Routing> routingCallback;
-  final Transition defaultTransition;
-  final bool opaqueRoute;
-  final VoidCallback onInit;
-  final VoidCallback onReady;
-  final VoidCallback onDispose;
-  final bool enableLog;
-  final LogWriterCallback logWriterCallback;
-  final bool popGesture;
+  final ValueChanged<Routing>? routingCallback;
+  final Transition? defaultTransition;
+  final bool? opaqueRoute;
+  final VoidCallback? onInit;
+  final VoidCallback? onReady;
+  final VoidCallback? onDispose;
+  final bool? enableLog;
+  final LogWriterCallback? logWriterCallback;
+  final bool? popGesture;
   final SmartManagement smartManagement;
   final SmartManagement smartManagement;
-  final Bindings initialBinding;
-  final Duration transitionDuration;
-  final bool defaultGlobalState;
-  final List<GetPage> getPages;
-  final GetPage unknownRoute;
-  final RouteInformationProvider routeInformationProvider;
-  final RouteInformationParser<Object> routeInformationParser;
-  final RouterDelegate<Object> routerDelegate;
-  final BackButtonDispatcher backButtonDispatcher;
+  final Bindings? initialBinding;
+  final Duration? transitionDuration;
+  final bool? defaultGlobalState;
+  final List<GetPage>? getPages;
+  final GetPage? unknownRoute;
+  final RouteInformationProvider? routeInformationProvider;
+  final RouteInformationParser<Object>? routeInformationParser;
+  final RouterDelegate<Object>? routerDelegate;
+  final BackButtonDispatcher? backButtonDispatcher;
 
 
   const GetMaterialApp.router({
   const GetMaterialApp.router({
-    Key key,
+    Key? key,
     this.routeInformationProvider,
     this.routeInformationProvider,
-    @required this.routeInformationParser,
-    @required this.routerDelegate,
+    required RouteInformationParser<Object> this.routeInformationParser,
+    required RouterDelegate<Object> this.routerDelegate,
     this.backButtonDispatcher,
     this.backButtonDispatcher,
     this.builder,
     this.builder,
     this.title = '',
     this.title = '',
@@ -211,7 +211,7 @@ class GetMaterialApp extends StatelessWidget {
         onDispose?.call();
         onDispose?.call();
       },
       },
       initState: (i) {
       initState: (i) {
-        Get.engine.addPostFrameCallback((timeStamp) {
+        Get.engine!.addPostFrameCallback((timeStamp) {
           onReady?.call();
           onReady?.call();
         });
         });
         if (locale != null) Get.locale = locale;
         if (locale != null) Get.locale = locale;
@@ -219,9 +219,9 @@ class GetMaterialApp extends StatelessWidget {
         if (fallbackLocale != null) Get.fallbackLocale = fallbackLocale;
         if (fallbackLocale != null) Get.fallbackLocale = fallbackLocale;
 
 
         if (translations != null) {
         if (translations != null) {
-          Get.addTranslations(translations.keys);
+          Get.addTranslations(translations!.keys);
         } else if (translationsKeys != null) {
         } else if (translationsKeys != null) {
-          Get.addTranslations(translationsKeys);
+          Get.addTranslations(translationsKeys!);
         }
         }
 
 
         Get.customTransition = customTransition;
         Get.customTransition = customTransition;
@@ -243,8 +243,8 @@ class GetMaterialApp extends StatelessWidget {
       },
       },
       builder: (_) => routerDelegate != null
       builder: (_) => routerDelegate != null
           ? MaterialApp.router(
           ? MaterialApp.router(
-              routerDelegate: routerDelegate,
-              routeInformationParser: routeInformationParser,
+              routerDelegate: routerDelegate!,
+              routeInformationParser: routeInformationParser!,
               backButtonDispatcher: backButtonDispatcher,
               backButtonDispatcher: backButtonDispatcher,
               routeInformationProvider: routeInformationProvider,
               routeInformationProvider: routeInformationProvider,
               key: _.unikey,
               key: _.unikey,
@@ -254,7 +254,7 @@ class GetMaterialApp extends StatelessWidget {
                       (rtlLanguages.contains(Get.locale?.languageCode)
                       (rtlLanguages.contains(Get.locale?.languageCode)
                           ? TextDirection.rtl
                           ? TextDirection.rtl
                           : TextDirection.ltr),
                           : TextDirection.ltr),
-                  child: builder == null ? child : builder(context, child),
+                  child: builder == null ? child! : builder!(context, child),
                 );
                 );
               },
               },
               title: title ?? '',
               title: title ?? '',
@@ -297,14 +297,14 @@ class GetMaterialApp extends StatelessWidget {
                   : <NavigatorObserver>[
                   : <NavigatorObserver>[
                       GetObserver(routingCallback, Get.routing)
                       GetObserver(routingCallback, Get.routing)
                     ]
                     ]
-                ..addAll(navigatorObservers)),
+                ..addAll(navigatorObservers!)),
               builder: (context, child) {
               builder: (context, child) {
                 return Directionality(
                 return Directionality(
                   textDirection: textDirection ??
                   textDirection: textDirection ??
                       (rtlLanguages.contains(Get.locale?.languageCode)
                       (rtlLanguages.contains(Get.locale?.languageCode)
                           ? TextDirection.rtl
                           ? TextDirection.rtl
                           : TextDirection.ltr),
                           : TextDirection.ltr),
-                  child: builder == null ? child : builder(context, child),
+                  child: builder == null ? child! : builder!(context, child),
                 );
                 );
               },
               },
               title: title ?? '',
               title: title ?? '',

@@ -2,10 +2,11 @@ import '../../../get_core/src/get_main.dart';
 
 
 import '../../get_navigation.dart';
 import '../../get_navigation.dart';
 import '../routes/get_route.dart';
 import '../routes/get_route.dart';
+import 'package:collection/collection.dart' show IterableExtension;
 
 
 class RouteDecoder {
 class RouteDecoder {
-  final GetPage route;
-  final Map<String, String> parameters;
+  final GetPage? route;
+  final Map<String?, String> parameters;
   const RouteDecoder(this.route, this.parameters);
   const RouteDecoder(this.route, this.parameters);
 }
 }
 
 
@@ -15,7 +16,7 @@ class ParseRouteTree {
   RouteDecoder matchRoute(String name) {
   RouteDecoder matchRoute(String name) {
     final uri = Uri.parse(name);
     final uri = Uri.parse(name);
     final route = _findRoute(uri.path);
     final route = _findRoute(uri.path);
-    final params = Map<String, String>.from(uri.queryParameters);
+    final params = Map<String?, String>.from(uri.queryParameters);
     if (route != null) {
     if (route != null) {
       final parsedParams = _parseParams(name, route.path);
       final parsedParams = _parseParams(name, route.path);
       if (parsedParams != null && parsedParams.isNotEmpty) {
       if (parsedParams != null && parsedParams.isNotEmpty) {
@@ -45,12 +46,12 @@ class ParseRouteTree {
 
 
   List<GetPage> _flattenPage(GetPage route) {
   List<GetPage> _flattenPage(GetPage route) {
     final result = <GetPage>[];
     final result = <GetPage>[];
-    if (route.children == null || route.children.isEmpty) {
+    if (route.children == null || route.children!.isEmpty) {
       return result;
       return result;
     }
     }
 
 
     final parentPath = route.name;
     final parentPath = route.name;
-    for (var page in route.children) {
+    for (var page in route.children!) {
       // Add Parent middlewares to children
       // Add Parent middlewares to children
       final pageMiddlewares = page.middlewares ?? <GetMiddleware>[];
       final pageMiddlewares = page.middlewares ?? <GetMiddleware>[];
       pageMiddlewares.addAll(route.middlewares ?? <GetMiddleware>[]);
       pageMiddlewares.addAll(route.middlewares ?? <GetMiddleware>[]);
@@ -88,19 +89,18 @@ class ParseRouteTree {
         middlewares: middlewares,
         middlewares: middlewares,
       );
       );
 
 
-  GetPage _findRoute(String name) {
-    return _routes.firstWhere(
+  GetPage? _findRoute(String name) {
+    return _routes.firstWhereOrNull(
       (route) => route.path.regex.hasMatch(name),
       (route) => route.path.regex.hasMatch(name),
-      orElse: () => null,
     );
     );
   }
   }
 
 
-  Map<String, String> _parseParams(String path, PathDecoded routePath) {
-    final params = <String, String>{};
-    Match paramsMatch = routePath.regex.firstMatch(path);
+  Map<String?, String> _parseParams(String path, PathDecoded routePath) {
+    final params = <String?, String>{};
+    Match? paramsMatch = routePath.regex.firstMatch(path);
 
 
     for (var i = 0; i < routePath.keys.length; i++) {
     for (var i = 0; i < routePath.keys.length; i++) {
-      var param = Uri.decodeQueryComponent(paramsMatch[i + 1]);
+      var param = Uri.decodeQueryComponent(paramsMatch![i + 1]!);
       params[routePath.keys[i]] = param;
       params[routePath.keys[i]] = param;
     }
     }
     return params;
     return params;

@@ -8,14 +8,14 @@ import 'parse_route.dart';
 
 
 class GetMaterialController extends GetxController {
 class GetMaterialController extends GetxController {
   bool testMode = false;
   bool testMode = false;
-  Key unikey;
-  ThemeData theme;
-  ThemeMode themeMode;
+  Key? unikey;
+  ThemeData? theme;
+  ThemeMode? themeMode;
 
 
   bool defaultPopGesture = GetPlatform.isIOS;
   bool defaultPopGesture = GetPlatform.isIOS;
   bool defaultOpaqueRoute = true;
   bool defaultOpaqueRoute = true;
 
 
-  Transition defaultTransition;
+  Transition? defaultTransition;
   Duration defaultTransitionDuration = Duration(milliseconds: 300);
   Duration defaultTransitionDuration = Duration(milliseconds: 300);
   Curve defaultTransitionCurve = Curves.easeOutQuad;
   Curve defaultTransitionCurve = Curves.easeOutQuad;
 
 
@@ -25,13 +25,13 @@ class GetMaterialController extends GetxController {
 
 
   final routing = Routing();
   final routing = Routing();
 
 
-  Map<String, String> parameters = {};
+  Map<String?, String> parameters = {};
 
 
-  ParseRouteTree routeTree;
+  ParseRouteTree? routeTree;
 
 
-  CustomTransition customTransition;
+  CustomTransition? customTransition;
 
 
-  GlobalKey<NavigatorState> key = GlobalKey<NavigatorState>();
+  GlobalKey<NavigatorState>? key = GlobalKey<NavigatorState>();
 
 
   Map<int, GlobalKey<NavigatorState>> keys = {};
   Map<int, GlobalKey<NavigatorState>> keys = {};
 
 

@@ -4,8 +4,8 @@ import 'package:flutter/widgets.dart';
 abstract class CustomTransition {
 abstract class CustomTransition {
   Widget buildTransition(
   Widget buildTransition(
     BuildContext context,
     BuildContext context,
-    Curve curve,
-    Alignment alignment,
+    Curve? curve,
+    Alignment? alignment,
     Animation<double> animation,
     Animation<double> animation,
     Animation<double> secondaryAnimation,
     Animation<double> secondaryAnimation,
     Widget child,
     Widget child,

@@ -12,7 +12,7 @@ import 'transitions_type.dart';
 
 
 class GetPageRoute<T> extends PageRoute<T> {
 class GetPageRoute<T> extends PageRoute<T> {
   GetPageRoute({
   GetPageRoute({
-    RouteSettings settings,
+    RouteSettings? settings,
     this.transitionDuration = const Duration(milliseconds: 300),
     this.transitionDuration = const Duration(milliseconds: 300),
     this.opaque = true,
     this.opaque = true,
     this.parameter,
     this.parameter,
@@ -41,41 +41,41 @@ class GetPageRoute<T> extends PageRoute<T> {
   @override
   @override
   final Duration transitionDuration;
   final Duration transitionDuration;
 
 
-  final GetPageBuilder page;
+  final GetPageBuilder? page;
 
 
-  final String routeName;
+  final String? routeName;
 
 
   final String reference;
   final String reference;
 
 
-  final CustomTransition customTransition;
+  final CustomTransition? customTransition;
 
 
-  final Bindings binding;
+  final Bindings? binding;
 
 
-  final Map<String, String> parameter;
+  final Map<String, String>? parameter;
 
 
-  final List<Bindings> bindings;
+  final List<Bindings>? bindings;
 
 
   @override
   @override
   final bool opaque;
   final bool opaque;
 
 
-  final bool popGesture;
+  final bool? popGesture;
 
 
   @override
   @override
   final bool barrierDismissible;
   final bool barrierDismissible;
 
 
-  final Transition transition;
+  final Transition? transition;
 
 
-  final Curve curve;
+  final Curve? curve;
 
 
-  final Alignment alignment;
+  final Alignment? alignment;
 
 
-  final List<GetMiddleware> middlewares;
+  final List<GetMiddleware>? middlewares;
 
 
   @override
   @override
-  final Color barrierColor;
+  final Color? barrierColor;
 
 
   @override
   @override
-  final String barrierLabel;
+  final String? barrierLabel;
 
 
   @override
   @override
   final bool maintainState;
   final bool maintainState;
@@ -93,8 +93,8 @@ class GetPageRoute<T> extends PageRoute<T> {
         route.willHandlePopInternally ||
         route.willHandlePopInternally ||
         route.hasScopedWillPopCallback ||
         route.hasScopedWillPopCallback ||
         route.fullscreenDialog ||
         route.fullscreenDialog ||
-        route.animation.status != AnimationStatus.completed ||
-        route.secondaryAnimation.status != AnimationStatus.dismissed ||
+        route.animation!.status != AnimationStatus.completed ||
+        route.secondaryAnimation!.status != AnimationStatus.dismissed ||
         isPopGestureInProgress(route)) return false;
         isPopGestureInProgress(route)) return false;
 
 
     return true;
     return true;
@@ -105,8 +105,8 @@ class GetPageRoute<T> extends PageRoute<T> {
     assert(_isPopGestureEnabled(route));
     assert(_isPopGestureEnabled(route));
 
 
     return _CupertinoBackGestureController<T>(
     return _CupertinoBackGestureController<T>(
-      navigator: route.navigator,
-      controller: route.controller,
+      navigator: route.navigator!,
+      controller: route.controller!,
     );
     );
   }
   }
 
 
@@ -129,12 +129,12 @@ class GetPageRoute<T> extends PageRoute<T> {
       }
       }
     }
     }
 
 
-    final pageToBuild = middlewareRunner.runOnPageBuildStart(page);
+    final pageToBuild = middlewareRunner.runOnPageBuildStart(page)!;
     return middlewareRunner.runOnPageBuilt(pageToBuild());
     return middlewareRunner.runOnPageBuilt(pageToBuild());
   }
   }
 
 
   static bool isPopGestureInProgress(PageRoute<dynamic> route) {
   static bool isPopGestureInProgress(PageRoute<dynamic> route) {
-    return route.navigator.userGestureInProgress;
+    return route.navigator!.userGestureInProgress;
   }
   }
 
 
   bool get popGestureInProgress => isPopGestureInProgress(this);
   bool get popGestureInProgress => isPopGestureInProgress(this);
@@ -156,7 +156,7 @@ class GetPageRoute<T> extends PageRoute<T> {
           linearTransition: hasCurve);
           linearTransition: hasCurve);
     }
     }
     if (customTransition != null) {
     if (customTransition != null) {
-      return customTransition.buildTransition(
+      return customTransition!.buildTransition(
         context,
         context,
         finalCurve,
         finalCurve,
         alignment,
         alignment,
@@ -312,7 +312,7 @@ class GetPageRoute<T> extends PageRoute<T> {
       case Transition.size:
       case Transition.size:
         return SizeTransitions().buildTransitions(
         return SizeTransitions().buildTransitions(
             context,
             context,
-            curve,
+            curve!,
             alignment,
             alignment,
             animation,
             animation,
             secondaryAnimation,
             secondaryAnimation,
@@ -364,7 +364,7 @@ class GetPageRoute<T> extends PageRoute<T> {
 
 
       default:
       default:
         if (Get.customTransition != null) {
         if (Get.customTransition != null) {
-          return Get.customTransition.buildTransition(
+          return Get.customTransition!.buildTransition(
               context, curve, alignment, animation, secondaryAnimation, child);
               context, curve, alignment, animation, secondaryAnimation, child);
         }
         }
 
 
@@ -386,7 +386,7 @@ class GetPageRoute<T> extends PageRoute<T> {
   void dispose() {
   void dispose() {
     super.dispose();
     super.dispose();
     if (Get.smartManagement != SmartManagement.onlyBuilder) {
     if (Get.smartManagement != SmartManagement.onlyBuilder) {
-      WidgetsBinding.instance.addPostFrameCallback((_) {
+      WidgetsBinding.instance!.addPostFrameCallback((_) {
         if (Get.reference != reference) {
         if (Get.reference != reference) {
           GetInstance().removeDependencyByRoute("$reference");
           GetInstance().removeDependencyByRoute("$reference");
         }
         }
@@ -412,10 +412,10 @@ const int _kMaxPageBackAnimationTime = 300;
 
 
 class _CupertinoBackGestureDetector<T> extends StatefulWidget {
 class _CupertinoBackGestureDetector<T> extends StatefulWidget {
   const _CupertinoBackGestureDetector({
   const _CupertinoBackGestureDetector({
-    Key key,
-    @required this.enabledCallback,
-    @required this.onStartPopGesture,
-    @required this.child,
+    Key? key,
+    required this.enabledCallback,
+    required this.onStartPopGesture,
+    required this.child,
   })  : assert(enabledCallback != null),
   })  : assert(enabledCallback != null),
         assert(onStartPopGesture != null),
         assert(onStartPopGesture != null),
         assert(child != null),
         assert(child != null),
@@ -434,9 +434,9 @@ class _CupertinoBackGestureDetector<T> extends StatefulWidget {
 
 
 class _CupertinoBackGestureDetectorState<T>
 class _CupertinoBackGestureDetectorState<T>
     extends State<_CupertinoBackGestureDetector<T>> {
     extends State<_CupertinoBackGestureDetector<T>> {
-  _CupertinoBackGestureController<T> _backGestureController;
+  _CupertinoBackGestureController<T>? _backGestureController;
 
 
-  HorizontalDragGestureRecognizer _recognizer;
+  late HorizontalDragGestureRecognizer _recognizer;
 
 
   @override
   @override
   void initState() {
   void initState() {
@@ -463,15 +463,15 @@ class _CupertinoBackGestureDetectorState<T>
   void _handleDragUpdate(DragUpdateDetails details) {
   void _handleDragUpdate(DragUpdateDetails details) {
     assert(mounted);
     assert(mounted);
     assert(_backGestureController != null);
     assert(_backGestureController != null);
-    _backGestureController.dragUpdate(
-        _convertToLogical(details.primaryDelta / context.size.width));
+    _backGestureController!.dragUpdate(
+        _convertToLogical(details.primaryDelta! / context.size!.width)!);
   }
   }
 
 
   void _handleDragEnd(DragEndDetails details) {
   void _handleDragEnd(DragEndDetails details) {
     assert(mounted);
     assert(mounted);
     assert(_backGestureController != null);
     assert(_backGestureController != null);
-    _backGestureController.dragEnd(_convertToLogical(
-        details.velocity.pixelsPerSecond.dx / context.size.width));
+    _backGestureController!.dragEnd(_convertToLogical(
+        details.velocity.pixelsPerSecond.dx / context.size!.width)!);
     _backGestureController = null;
     _backGestureController = null;
   }
   }
 
 
@@ -487,7 +487,7 @@ class _CupertinoBackGestureDetectorState<T>
     if (widget.enabledCallback()) _recognizer.addPointer(event);
     if (widget.enabledCallback()) _recognizer.addPointer(event);
   }
   }
 
 
-  double _convertToLogical(double value) {
+  double? _convertToLogical(double value) {
     switch (Directionality.of(context)) {
     switch (Directionality.of(context)) {
       case TextDirection.rtl:
       case TextDirection.rtl:
         return -value;
         return -value;
@@ -533,8 +533,8 @@ class _CupertinoBackGestureController<T> {
   ///
   ///
   /// The [navigator] and [controller] arguments must not be null.
   /// The [navigator] and [controller] arguments must not be null.
   _CupertinoBackGestureController({
   _CupertinoBackGestureController({
-    @required this.navigator,
-    @required this.controller,
+    required this.navigator,
+    required this.controller,
   })  : assert(navigator != null),
   })  : assert(navigator != null),
         assert(controller != null) {
         assert(controller != null) {
     navigator.didStartUserGesture();
     navigator.didStartUserGesture();
@@ -579,7 +579,7 @@ class _CupertinoBackGestureController<T> {
           _kMaxDroppedSwipePageForwardAnimationTime,
           _kMaxDroppedSwipePageForwardAnimationTime,
           0,
           0,
           controller.value,
           controller.value,
-        ).floor(),
+        )!.floor(),
         _kMaxPageBackAnimationTime,
         _kMaxPageBackAnimationTime,
       );
       );
       controller.animateTo(1.0,
       controller.animateTo(1.0,
@@ -597,7 +597,7 @@ class _CupertinoBackGestureController<T> {
           0,
           0,
           _kMaxDroppedSwipePageForwardAnimationTime,
           _kMaxDroppedSwipePageForwardAnimationTime,
           controller.value,
           controller.value,
-        ).floor();
+        )!.floor();
         controller.animateBack(
         controller.animateBack(
           0.0,
           0.0,
           duration: Duration(milliseconds: droppedPageBackAnimationTime),
           duration: Duration(milliseconds: droppedPageBackAnimationTime),
@@ -610,7 +610,7 @@ class _CupertinoBackGestureController<T> {
       // Keep the userGestureInProgress in true state so we don't change the
       // Keep the userGestureInProgress in true state so we don't change the
       // curve of the page transition mid-flight since CupertinoPageTransition
       // curve of the page transition mid-flight since CupertinoPageTransition
       // depends on userGestureInProgress.
       // depends on userGestureInProgress.
-      AnimationStatusListener animationStatusCallback;
+      late AnimationStatusListener animationStatusCallback;
       animationStatusCallback = (status) {
       animationStatusCallback = (status) {
         navigator.didStopUserGesture();
         navigator.didStopUserGesture();
         controller.removeStatusListener(animationStatusCallback);
         controller.removeStatusListener(animationStatusCallback);

@@ -4,8 +4,8 @@ import 'package:flutter/material.dart';
 class LeftToRightFadeTransition {
 class LeftToRightFadeTransition {
   Widget buildTransitions(
   Widget buildTransitions(
       BuildContext context,
       BuildContext context,
-      Curve curve,
-      Alignment alignment,
+      Curve? curve,
+      Alignment? alignment,
       Animation<double> animation,
       Animation<double> animation,
       Animation<double> secondaryAnimation,
       Animation<double> secondaryAnimation,
       Widget child) {
       Widget child) {
@@ -30,8 +30,8 @@ class LeftToRightFadeTransition {
 class RightToLeftFadeTransition {
 class RightToLeftFadeTransition {
   Widget buildTransitions(
   Widget buildTransitions(
       BuildContext context,
       BuildContext context,
-      Curve curve,
-      Alignment alignment,
+      Curve? curve,
+      Alignment? alignment,
       Animation<double> animation,
       Animation<double> animation,
       Animation<double> secondaryAnimation,
       Animation<double> secondaryAnimation,
       Widget child) {
       Widget child) {
@@ -68,8 +68,8 @@ class NoTransition {
 class FadeInTransition {
 class FadeInTransition {
   Widget buildTransitions(
   Widget buildTransitions(
       BuildContext context,
       BuildContext context,
-      Curve curve,
-      Alignment alignment,
+      Curve? curve,
+      Alignment? alignment,
       Animation<double> animation,
       Animation<double> animation,
       Animation<double> secondaryAnimation,
       Animation<double> secondaryAnimation,
       Widget child) {
       Widget child) {
@@ -80,8 +80,8 @@ class FadeInTransition {
 class SlideDownTransition {
 class SlideDownTransition {
   Widget buildTransitions(
   Widget buildTransitions(
       BuildContext context,
       BuildContext context,
-      Curve curve,
-      Alignment alignment,
+      Curve? curve,
+      Alignment? alignment,
       Animation<double> animation,
       Animation<double> animation,
       Animation<double> secondaryAnimation,
       Animation<double> secondaryAnimation,
       Widget child) {
       Widget child) {
@@ -98,8 +98,8 @@ class SlideDownTransition {
 class SlideLeftTransition {
 class SlideLeftTransition {
   Widget buildTransitions(
   Widget buildTransitions(
       BuildContext context,
       BuildContext context,
-      Curve curve,
-      Alignment alignment,
+      Curve? curve,
+      Alignment? alignment,
       Animation<double> animation,
       Animation<double> animation,
       Animation<double> secondaryAnimation,
       Animation<double> secondaryAnimation,
       Widget child) {
       Widget child) {
@@ -116,8 +116,8 @@ class SlideLeftTransition {
 class SlideRightTransition {
 class SlideRightTransition {
   Widget buildTransitions(
   Widget buildTransitions(
       BuildContext context,
       BuildContext context,
-      Curve curve,
-      Alignment alignment,
+      Curve? curve,
+      Alignment? alignment,
       Animation<double> animation,
       Animation<double> animation,
       Animation<double> secondaryAnimation,
       Animation<double> secondaryAnimation,
       Widget child) {
       Widget child) {
@@ -134,8 +134,8 @@ class SlideRightTransition {
 class SlideTopTransition {
 class SlideTopTransition {
   Widget buildTransitions(
   Widget buildTransitions(
       BuildContext context,
       BuildContext context,
-      Curve curve,
-      Alignment alignment,
+      Curve? curve,
+      Alignment? alignment,
       Animation<double> animation,
       Animation<double> animation,
       Animation<double> secondaryAnimation,
       Animation<double> secondaryAnimation,
       Widget child) {
       Widget child) {
@@ -152,8 +152,8 @@ class SlideTopTransition {
 class ZoomInTransition {
 class ZoomInTransition {
   Widget buildTransitions(
   Widget buildTransitions(
       BuildContext context,
       BuildContext context,
-      Curve curve,
-      Alignment alignment,
+      Curve? curve,
+      Alignment? alignment,
       Animation<double> animation,
       Animation<double> animation,
       Animation<double> secondaryAnimation,
       Animation<double> secondaryAnimation,
       Widget child) {
       Widget child) {
@@ -168,7 +168,7 @@ class SizeTransitions {
   Widget buildTransitions(
   Widget buildTransitions(
       BuildContext context,
       BuildContext context,
       Curve curve,
       Curve curve,
-      Alignment alignment,
+      Alignment? alignment,
       Animation<double> animation,
       Animation<double> animation,
       Animation<double> secondaryAnimation,
       Animation<double> secondaryAnimation,
       Widget child) {
       Widget child) {

@@ -8,33 +8,33 @@ import 'transitions_type.dart';
 class PathDecoded {
 class PathDecoded {
   const PathDecoded(this.regex, this.keys);
   const PathDecoded(this.regex, this.keys);
   final RegExp regex;
   final RegExp regex;
-  final List<String> keys;
+  final List<String?> keys;
 }
 }
 
 
 class GetPage {
 class GetPage {
   final String name;
   final String name;
   final GetPageBuilder page;
   final GetPageBuilder page;
-  final bool popGesture;
-  final Map<String, String> parameter;
-  final String title;
-  final Transition transition;
+  final bool? popGesture;
+  final Map<String, String>? parameter;
+  final String? title;
+  final Transition? transition;
   final Curve curve;
   final Curve curve;
-  final Alignment alignment;
+  final Alignment? alignment;
   final bool maintainState;
   final bool maintainState;
   final bool opaque;
   final bool opaque;
-  final Bindings binding;
+  final Bindings? binding;
   final List<Bindings> bindings;
   final List<Bindings> bindings;
-  final CustomTransition customTransition;
-  final Duration transitionDuration;
+  final CustomTransition? customTransition;
+  final Duration? transitionDuration;
   final bool fullscreenDialog;
   final bool fullscreenDialog;
-  final RouteSettings settings;
-  final List<GetPage> children;
-  final List<GetMiddleware> middlewares;
+  final RouteSettings? settings;
+  final List<GetPage>? children;
+  final List<GetMiddleware>? middlewares;
   final PathDecoded path;
   final PathDecoded path;
 
 
   GetPage({
   GetPage({
-    @required this.name,
-    @required this.page,
+    required this.name,
+    required this.page,
     this.title,
     this.title,
     this.settings,
     this.settings,
     this.maintainState = true,
     this.maintainState = true,
@@ -58,7 +58,7 @@ class GetPage {
         assert(fullscreenDialog != null);
         assert(fullscreenDialog != null);
 
 
   static PathDecoded _nameToRegex(String path) {
   static PathDecoded _nameToRegex(String path) {
-    var keys = <String>[];
+    var keys = <String?>[];
 
 
     String _replace(Match pattern) {
     String _replace(Match pattern) {
       var buffer = StringBuffer('(?:');
       var buffer = StringBuffer('(?:');
@@ -79,24 +79,24 @@ class GetPage {
   }
   }
 
 
   GetPage copyWith({
   GetPage copyWith({
-    String name,
-    GetPageBuilder page,
-    bool popGesture,
-    Map<String, String> parameter,
-    String title,
-    Transition transition,
-    Curve curve,
-    Alignment alignment,
-    bool maintainState,
-    bool opaque,
-    Bindings binding,
-    List<Bindings> bindings,
-    CustomTransition customTransition,
-    Duration transitionDuration,
-    bool fullscreenDialog,
-    RouteSettings settings,
-    List<GetPage> children,
-    List<GetMiddleware> middlewares,
+    String? name,
+    GetPageBuilder? page,
+    bool? popGesture,
+    Map<String, String>? parameter,
+    String? title,
+    Transition? transition,
+    Curve? curve,
+    Alignment? alignment,
+    bool? maintainState,
+    bool? opaque,
+    Bindings? binding,
+    List<Bindings>? bindings,
+    CustomTransition? customTransition,
+    Duration? transitionDuration,
+    bool? fullscreenDialog,
+    RouteSettings? settings,
+    List<GetPage>? children,
+    List<GetMiddleware>? middlewares,
   }) {
   }) {
     return GetPage(
     return GetPage(
       name: name ?? this.name,
       name: name ?? this.name,

@@ -10,11 +10,11 @@ class Routing {
   String previous;
   String previous;
   dynamic args;
   dynamic args;
   String removed;
   String removed;
-  Route<dynamic> route;
-  bool isBack;
-  bool isSnackbar;
-  bool isBottomSheet;
-  bool isDialog;
+  Route<dynamic>? route;
+  bool? isBack;
+  bool? isSnackbar;
+  bool? isBottomSheet;
+  bool? isDialog;
 
 
   Routing({
   Routing({
     this.current = '',
     this.current = '',
@@ -35,9 +35,9 @@ class Routing {
 
 
 /// Extracts the name of a route based on it's instance type
 /// Extracts the name of a route based on it's instance type
 /// or null if not possible.
 /// or null if not possible.
-String _extractRouteName(Route route) {
+String? _extractRouteName(Route? route) {
   if (route?.settings?.name != null) {
   if (route?.settings?.name != null) {
-    return route.settings.name;
+    return route!.settings.name;
   }
   }
 
 
   if (route is GetPageRoute) {
   if (route is GetPageRoute) {
@@ -61,17 +61,17 @@ class _RouteData {
   final bool isSnackbar;
   final bool isSnackbar;
   final bool isBottomSheet;
   final bool isBottomSheet;
   final bool isDialog;
   final bool isDialog;
-  final String name;
+  final String? name;
 
 
   _RouteData({
   _RouteData({
-    @required this.name,
-    @required this.isGetPageRoute,
-    @required this.isSnackbar,
-    @required this.isBottomSheet,
-    @required this.isDialog,
+    required this.name,
+    required this.isGetPageRoute,
+    required this.isSnackbar,
+    required this.isBottomSheet,
+    required this.isDialog,
   });
   });
 
 
-  factory _RouteData.ofRoute(Route route) {
+  factory _RouteData.ofRoute(Route? route) {
     return _RouteData(
     return _RouteData(
       name: _extractRouteName(route),
       name: _extractRouteName(route),
       isGetPageRoute: route is GetPageRoute,
       isGetPageRoute: route is GetPageRoute,
@@ -83,14 +83,14 @@ class _RouteData {
 }
 }
 
 
 class GetObserver extends NavigatorObserver {
 class GetObserver extends NavigatorObserver {
-  final Function(Routing) routing;
+  final Function(Routing?)? routing;
 
 
   GetObserver([this.routing, this._routeSend]);
   GetObserver([this.routing, this._routeSend]);
 
 
-  final Routing _routeSend;
+  final Routing? _routeSend;
 
 
   @override
   @override
-  void didPush(Route route, Route previousRoute) {
+  void didPush(Route route, Route? previousRoute) {
     super.didPush(route, previousRoute);
     super.didPush(route, previousRoute);
     final newRoute = _RouteData.ofRoute(route);
     final newRoute = _RouteData.ofRoute(route);
 
 
@@ -122,12 +122,12 @@ class GetObserver extends NavigatorObserver {
     });
     });
 
 
     if (routing != null) {
     if (routing != null) {
-      routing(_routeSend);
+      routing!(_routeSend);
     }
     }
   }
   }
 
 
   @override
   @override
-  void didPop(Route route, Route previousRoute) {
+  void didPop(Route route, Route? previousRoute) {
     super.didPop(route, previousRoute);
     super.didPop(route, previousRoute);
     final currentRoute = _RouteData.ofRoute(route);
     final currentRoute = _RouteData.ofRoute(route);
     final newRoute = _RouteData.ofRoute(previousRoute);
     final newRoute = _RouteData.ofRoute(previousRoute);
@@ -167,7 +167,7 @@ class GetObserver extends NavigatorObserver {
   }
   }
 
 
   @override
   @override
-  void didReplace({Route newRoute, Route oldRoute}) {
+  void didReplace({Route? newRoute, Route? oldRoute}) {
     super.didReplace(newRoute: newRoute, oldRoute: oldRoute);
     super.didReplace(newRoute: newRoute, oldRoute: oldRoute);
     final newName = _extractRouteName(newRoute);
     final newName = _extractRouteName(newRoute);
     final oldName = _extractRouteName(oldRoute);
     final oldName = _extractRouteName(oldRoute);
@@ -198,7 +198,7 @@ class GetObserver extends NavigatorObserver {
   }
   }
 
 
   @override
   @override
-  void didRemove(Route route, Route previousRoute) {
+  void didRemove(Route route, Route? previousRoute) {
     super.didRemove(route, previousRoute);
     super.didRemove(route, previousRoute);
     final routeName = _extractRouteName(route);
     final routeName = _extractRouteName(route);
     final currentRoute = _RouteData.ofRoute(route);
     final currentRoute = _RouteData.ofRoute(route);

@@ -16,7 +16,7 @@ abstract class _RouteMiddleware {
   /// ```
   /// ```
   ///  -8 => 2 => 4 => 5
   ///  -8 => 2 => 4 => 5
   /// {@end-tool}
   /// {@end-tool}
-  int priority;
+  int? priority;
 
 
   /// This function will be called when the page of
   /// This function will be called when the page of
   /// the called route is being searched for.
   /// the called route is being searched for.
@@ -30,7 +30,7 @@ abstract class _RouteMiddleware {
   /// }
   /// }
   /// ```
   /// ```
   /// {@end-tool}
   /// {@end-tool}
-  RouteSettings redirect(String route);
+  RouteSettings? redirect(String route);
 
 
   /// This function will be called when this Page is called
   /// This function will be called when this Page is called
   /// you can use it to change something about the page or give it new page
   /// you can use it to change something about the page or give it new page
@@ -42,7 +42,7 @@ abstract class _RouteMiddleware {
   /// }
   /// }
   /// ```
   /// ```
   /// {@end-tool}
   /// {@end-tool}
-  GetPage onPageCalled(GetPage page);
+  GetPage? onPageCalled(GetPage page);
 
 
   /// This function will be called right before the [Bindings] are initialize.
   /// This function will be called right before the [Bindings] are initialize.
   /// Here you can change [Bindings] for this page
   /// Here you can change [Bindings] for this page
@@ -57,10 +57,10 @@ abstract class _RouteMiddleware {
   /// }
   /// }
   /// ```
   /// ```
   /// {@end-tool}
   /// {@end-tool}
-  List<Bindings> onBindingsStart(List<Bindings> bindings);
+  List<Bindings>? onBindingsStart(List<Bindings> bindings);
 
 
   /// This function will be called right after the [Bindings] are initialize.
   /// This function will be called right after the [Bindings] are initialize.
-  GetPageBuilder onPageBuildStart(GetPageBuilder page);
+  GetPageBuilder? onPageBuildStart(GetPageBuilder page);
 
 
   /// This function will be called right after the
   /// This function will be called right after the
   /// GetPage.page function is called and will give you the result
   /// GetPage.page function is called and will give you the result
@@ -76,21 +76,21 @@ abstract class _RouteMiddleware {
 /// [onPageBuildStart] -> [onPageBuilt] -> [onPageDispose] ))
 /// [onPageBuildStart] -> [onPageBuilt] -> [onPageDispose] ))
 class GetMiddleware implements _RouteMiddleware {
 class GetMiddleware implements _RouteMiddleware {
   @override
   @override
-  int priority = 0;
+  int? priority = 0;
 
 
   GetMiddleware({this.priority});
   GetMiddleware({this.priority});
 
 
   @override
   @override
-  RouteSettings redirect(String route) => null;
+  RouteSettings? redirect(String? route) => null;
 
 
   @override
   @override
-  GetPage onPageCalled(GetPage page) => page;
+  GetPage? onPageCalled(GetPage? page) => page;
 
 
   @override
   @override
-  List<Bindings> onBindingsStart(List<Bindings> bindings) => bindings;
+  List<Bindings>? onBindingsStart(List<Bindings>? bindings) => bindings;
 
 
   @override
   @override
-  GetPageBuilder onPageBuildStart(GetPageBuilder page) => page;
+  GetPageBuilder? onPageBuildStart(GetPageBuilder? page) => page;
 
 
   @override
   @override
   Widget onPageBuilt(Widget page) => page;
   Widget onPageBuilt(Widget page) => page;
@@ -102,26 +102,26 @@ class GetMiddleware implements _RouteMiddleware {
 class MiddlewareRunner {
 class MiddlewareRunner {
   MiddlewareRunner(this._middlewares);
   MiddlewareRunner(this._middlewares);
 
 
-  final List<GetMiddleware> _middlewares;
+  final List<GetMiddleware>? _middlewares;
 
 
-  List<GetMiddleware> _getMiddlewares() {
+  List<GetMiddleware>? _getMiddlewares() {
     if (_middlewares != null) {
     if (_middlewares != null) {
-      _middlewares.sort((a, b) => a.priority.compareTo(b.priority));
+      _middlewares!.sort((a, b) => a.priority!.compareTo(b.priority!));
       return _middlewares;
       return _middlewares;
     }
     }
     return <GetMiddleware>[];
     return <GetMiddleware>[];
   }
   }
 
 
-  GetPage runOnPageCalled(GetPage page) {
-    _getMiddlewares().forEach((element) {
+  GetPage? runOnPageCalled(GetPage? page) {
+    _getMiddlewares()!.forEach((element) {
       page = element.onPageCalled(page);
       page = element.onPageCalled(page);
     });
     });
     return page;
     return page;
   }
   }
 
 
-  RouteSettings runRedirect(String route) {
-    RouteSettings to;
-    _getMiddlewares().forEach((element) {
+  RouteSettings? runRedirect(String? route) {
+    RouteSettings? to;
+    _getMiddlewares()!.forEach((element) {
       to = element.redirect(route);
       to = element.redirect(route);
     });
     });
     if (to != null) {
     if (to != null) {
@@ -130,34 +130,34 @@ class MiddlewareRunner {
     return to;
     return to;
   }
   }
 
 
-  List<Bindings> runOnBindingsStart(List<Bindings> bindings) {
-    _getMiddlewares().forEach((element) {
+  List<Bindings>? runOnBindingsStart(List<Bindings>? bindings) {
+    _getMiddlewares()!.forEach((element) {
       bindings = element.onBindingsStart(bindings);
       bindings = element.onBindingsStart(bindings);
     });
     });
     return bindings;
     return bindings;
   }
   }
 
 
-  GetPageBuilder runOnPageBuildStart(GetPageBuilder page) {
-    _getMiddlewares().forEach((element) {
+  GetPageBuilder? runOnPageBuildStart(GetPageBuilder? page) {
+    _getMiddlewares()!.forEach((element) {
       page = element.onPageBuildStart(page);
       page = element.onPageBuildStart(page);
     });
     });
     return page;
     return page;
   }
   }
 
 
   Widget runOnPageBuilt(Widget page) {
   Widget runOnPageBuilt(Widget page) {
-    _getMiddlewares().forEach((element) {
+    _getMiddlewares()!.forEach((element) {
       page = element.onPageBuilt(page);
       page = element.onPageBuilt(page);
     });
     });
     return page;
     return page;
   }
   }
 
 
   void runOnPageDispose() =>
   void runOnPageDispose() =>
-      _getMiddlewares().forEach((element) => element.onPageDispose());
+      _getMiddlewares()!.forEach((element) => element.onPageDispose());
 }
 }
 
 
 class PageRedirect {
 class PageRedirect {
-  GetPage route;
-  GetPage unknownRoute;
+  GetPage? route;
+  GetPage? unknownRoute;
   RouteSettings settings;
   RouteSettings settings;
   bool isUnknown;
   bool isUnknown;
 
 
@@ -169,43 +169,43 @@ class PageRedirect {
     while (needRecheck()) {}
     while (needRecheck()) {}
     return isUnknown
     return isUnknown
         ? GetPageRoute(
         ? GetPageRoute(
-            page: unknownRoute.page,
-            parameter: unknownRoute.parameter,
+            page: unknownRoute!.page,
+            parameter: unknownRoute!.parameter,
             settings: RouteSettings(
             settings: RouteSettings(
-                name: unknownRoute.name, arguments: settings.arguments),
-            curve: unknownRoute.curve,
-            opaque: unknownRoute.opaque,
-            customTransition: unknownRoute.customTransition,
-            binding: unknownRoute.binding,
-            bindings: unknownRoute.bindings,
-            transitionDuration: (unknownRoute.transitionDuration ??
+                name: unknownRoute!.name, arguments: settings.arguments),
+            curve: unknownRoute!.curve,
+            opaque: unknownRoute!.opaque,
+            customTransition: unknownRoute!.customTransition,
+            binding: unknownRoute!.binding,
+            bindings: unknownRoute!.bindings,
+            transitionDuration: (unknownRoute!.transitionDuration ??
                 Get.defaultTransitionDuration),
                 Get.defaultTransitionDuration),
-            transition: unknownRoute.transition,
-            popGesture: unknownRoute.popGesture,
-            fullscreenDialog: unknownRoute.fullscreenDialog,
-            middlewares: unknownRoute.middlewares,
+            transition: unknownRoute!.transition,
+            popGesture: unknownRoute!.popGesture,
+            fullscreenDialog: unknownRoute!.fullscreenDialog,
+            middlewares: unknownRoute!.middlewares,
           )
           )
         : GetPageRoute(
         : GetPageRoute(
-            page: route.page,
-            parameter: route.parameter,
+            page: route!.page,
+            parameter: route!.parameter,
             settings: RouteSettings(
             settings: RouteSettings(
                 name: settings.name, arguments: settings.arguments),
                 name: settings.name, arguments: settings.arguments),
-            curve: route.curve,
-            opaque: route.opaque,
-            customTransition: route.customTransition,
-            binding: route.binding,
-            bindings: route.bindings,
+            curve: route!.curve,
+            opaque: route!.opaque,
+            customTransition: route!.customTransition,
+            binding: route!.binding,
+            bindings: route!.bindings,
             transitionDuration:
             transitionDuration:
-                (route.transitionDuration ?? Get.defaultTransitionDuration),
-            transition: route.transition,
-            popGesture: route.popGesture,
-            fullscreenDialog: route.fullscreenDialog,
-            middlewares: route.middlewares);
+                (route!.transitionDuration ?? Get.defaultTransitionDuration),
+            transition: route!.transition,
+            popGesture: route!.popGesture,
+            fullscreenDialog: route!.fullscreenDialog,
+            middlewares: route!.middlewares);
   }
   }
 
 
   /// check if redirect is needed
   /// check if redirect is needed
   bool needRecheck() {
   bool needRecheck() {
-    final match = Get.routeTree.matchRoute(settings.name);
+    final match = Get.routeTree!.matchRoute(settings.name!);
     Get.parameters = match?.parameters;
     Get.parameters = match?.parameters;
 
 
     // No Match found
     // No Match found
@@ -214,12 +214,12 @@ class PageRedirect {
       return false;
       return false;
     }
     }
 
 
-    final runner = MiddlewareRunner(match.route.middlewares);
+    final runner = MiddlewareRunner(match.route!.middlewares);
     route = runner.runOnPageCalled(match.route);
     route = runner.runOnPageCalled(match.route);
-    addPageParameter(route);
+    addPageParameter(route!);
 
 
     // No middlewares found return match.
     // No middlewares found return match.
-    if (match.route.middlewares == null || match.route.middlewares.isEmpty) {
+    if (match.route!.middlewares == null || match.route!.middlewares!.isEmpty) {
       return false;
       return false;
     }
     }
     final newSettings = runner.runRedirect(settings.name);
     final newSettings = runner.runRedirect(settings.name);
@@ -234,10 +234,10 @@ class PageRedirect {
     if (route.parameter == null) return;
     if (route.parameter == null) return;
 
 
     if (Get.parameters == null) {
     if (Get.parameters == null) {
-      Get.parameters = route.parameter;
+      Get.parameters = route.parameter!;
     } else {
     } else {
       final parameters = Get.parameters;
       final parameters = Get.parameters;
-      parameters.addEntries(route.parameter.entries);
+      parameters.addEntries(route.parameter!.entries);
       Get.parameters = parameters;
       Get.parameters = parameters;
     }
     }
   }
   }

@@ -5,12 +5,12 @@ import 'package:flutter/scheduler.dart';
 import '../../../get_core/get_core.dart';
 import '../../../get_core/get_core.dart';
 import '../../get_navigation.dart';
 import '../../get_navigation.dart';
 
 
-typedef SnackbarStatusCallback = void Function(SnackbarStatus status);
+typedef SnackbarStatusCallback = void Function(SnackbarStatus? status);
 typedef OnTap = void Function(GetBar snack);
 typedef OnTap = void Function(GetBar snack);
 
 
 class GetBar<T extends Object> extends StatefulWidget {
 class GetBar<T extends Object> extends StatefulWidget {
   GetBar({
   GetBar({
-    Key key,
+    Key? key,
     this.title,
     this.title,
     this.message,
     this.message,
     this.titleText,
     this.titleText,
@@ -45,7 +45,7 @@ class GetBar<T extends Object> extends StatefulWidget {
     this.overlayBlur = 0.0,
     this.overlayBlur = 0.0,
     this.overlayColor = Colors.transparent,
     this.overlayColor = Colors.transparent,
     this.userInputForm,
     this.userInputForm,
-    SnackbarStatusCallback snackbarStatus,
+    SnackbarStatusCallback? snackbarStatus,
   })  : snackbarStatus = (snackbarStatus ?? (status) {}),
   })  : snackbarStatus = (snackbarStatus ?? (status) {}),
         super(key: key);
         super(key: key);
 
 
@@ -53,18 +53,18 @@ class GetBar<T extends Object> extends StatefulWidget {
   final SnackbarStatusCallback snackbarStatus;
   final SnackbarStatusCallback snackbarStatus;
 
 
   /// The title displayed to the user
   /// The title displayed to the user
-  final String title;
+  final String? title;
 
 
   /// The message displayed to the user.
   /// The message displayed to the user.
-  final String message;
+  final String? message;
 
 
   /// Replaces [title]. Although this accepts a [Widget], it is meant
   /// Replaces [title]. Although this accepts a [Widget], it is meant
   /// to receive [Text] or [RichText]
   /// to receive [Text] or [RichText]
-  final Widget titleText;
+  final Widget? titleText;
 
 
   /// Replaces [message]. Although this accepts a [Widget], it is meant
   /// Replaces [message]. Although this accepts a [Widget], it is meant
   /// to receive [Text] or  [RichText]
   /// to receive [Text] or  [RichText]
-  final Widget messageText;
+  final Widget? messageText;
 
 
   /// Will be ignored if [backgroundGradient] is not null
   /// Will be ignored if [backgroundGradient] is not null
   final Color backgroundColor;
   final Color backgroundColor;
@@ -72,48 +72,48 @@ class GetBar<T extends Object> extends StatefulWidget {
   /// If not null, shows a left vertical colored bar on notification.
   /// If not null, shows a left vertical colored bar on notification.
   /// It is not possible to use it with a [Form] and I do not recommend
   /// It is not possible to use it with a [Form] and I do not recommend
   /// using it with [LinearProgressIndicator]
   /// using it with [LinearProgressIndicator]
-  final Color leftBarIndicatorColor;
+  final Color? leftBarIndicatorColor;
 
 
   /// [boxShadows] The shadows generated by Snack. Leave it null
   /// [boxShadows] The shadows generated by Snack. Leave it null
   /// if you don't want a shadow.
   /// if you don't want a shadow.
   /// You can use more than one if you feel the need.
   /// You can use more than one if you feel the need.
   /// Check (this example)[https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/material/shadows.dart]
   /// Check (this example)[https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/material/shadows.dart]
-  final List<BoxShadow> boxShadows;
+  final List<BoxShadow>? boxShadows;
 
 
   /// Makes [backgroundColor] be ignored.
   /// Makes [backgroundColor] be ignored.
-  final Gradient backgroundGradient;
+  final Gradient? backgroundGradient;
 
 
   /// You can use any widget here, but I recommend [Icon] or [Image] as
   /// You can use any widget here, but I recommend [Icon] or [Image] as
   /// indication of what kind
   /// indication of what kind
   /// of message you are displaying. Other widgets may break the layout
   /// of message you are displaying. Other widgets may break the layout
-  final Widget icon;
+  final Widget? icon;
 
 
   /// An option to animate the icon (if present). Defaults to true.
   /// An option to animate the icon (if present). Defaults to true.
   final bool shouldIconPulse;
   final bool shouldIconPulse;
 
 
   /// A [TextButton] widget if you need an action from the user.
   /// A [TextButton] widget if you need an action from the user.
-  final Widget mainButton;
+  final Widget? mainButton;
 
 
   /// A callback that registers the user's click anywhere.
   /// A callback that registers the user's click anywhere.
   /// An alternative to [mainButton]
   /// An alternative to [mainButton]
-  final OnTap onTap;
+  final OnTap? onTap;
 
 
   /// How long until Snack will hide itself (be dismissed).
   /// How long until Snack will hide itself (be dismissed).
   /// To make it indefinite, leave it null.
   /// To make it indefinite, leave it null.
-  final Duration duration;
+  final Duration? duration;
 
 
   /// True if you want to show a [LinearProgressIndicator].
   /// True if you want to show a [LinearProgressIndicator].
   final bool showProgressIndicator;
   final bool showProgressIndicator;
 
 
   /// An optional [AnimationController] when you want to control the
   /// An optional [AnimationController] when you want to control the
   /// progress of your [LinearProgressIndicator].
   /// progress of your [LinearProgressIndicator].
-  final AnimationController progressIndicatorController;
+  final AnimationController? progressIndicatorController;
 
 
   /// A [LinearProgressIndicator] configuration parameter.
   /// A [LinearProgressIndicator] configuration parameter.
-  final Color progressIndicatorBackgroundColor;
+  final Color? progressIndicatorBackgroundColor;
 
 
   /// A [LinearProgressIndicator] configuration parameter.
   /// A [LinearProgressIndicator] configuration parameter.
-  final Animation<Color> progressIndicatorValueColor;
+  final Animation<Color>? progressIndicatorValueColor;
 
 
   /// Determines if the user can swipe or click the overlay
   /// Determines if the user can swipe or click the overlay
   /// (if [overlayBlur] > 0) to dismiss.
   /// (if [overlayBlur] > 0) to dismiss.
@@ -123,7 +123,7 @@ class GetBar<T extends Object> extends StatefulWidget {
   final bool isDismissible;
   final bool isDismissible;
 
 
   /// Used to limit Snack width (usually on large screens)
   /// Used to limit Snack width (usually on large screens)
-  final double maxWidth;
+  final double? maxWidth;
 
 
   /// Adds a custom margin to Snack
   /// Adds a custom margin to Snack
   final EdgeInsets margin;
   final EdgeInsets margin;
@@ -140,10 +140,10 @@ class GetBar<T extends Object> extends StatefulWidget {
   /// Adds a border to every side of Snack
   /// Adds a border to every side of Snack
   /// I do not recommend using it with [showProgressIndicator]
   /// I do not recommend using it with [showProgressIndicator]
   /// or [leftBarIndicatorColor].
   /// or [leftBarIndicatorColor].
-  final Color borderColor;
+  final Color? borderColor;
 
 
   /// Changes the width of the border if [borderColor] is specified
   /// Changes the width of the border if [borderColor] is specified
-  final double borderWidth;
+  final double? borderWidth;
 
 
   /// Snack can be based on [SnackPosition.TOP] or on [SnackPosition.BOTTOM]
   /// Snack can be based on [SnackPosition.TOP] or on [SnackPosition.BOTTOM]
   /// of your screen.
   /// of your screen.
@@ -176,7 +176,7 @@ class GetBar<T extends Object> extends StatefulWidget {
   /// Default is 0.0. If different than 0.0, blurs only Snack's background.
   /// Default is 0.0. If different than 0.0, blurs only Snack's background.
   /// To take effect, make sure your [backgroundColor] has some opacity.
   /// To take effect, make sure your [backgroundColor] has some opacity.
   /// The greater the value, the greater the blur.
   /// The greater the value, the greater the blur.
-  final double barBlur;
+  final double? barBlur;
 
 
   /// Default is 0.0. If different than 0.0, creates a blurred
   /// Default is 0.0. If different than 0.0, creates a blurred
   /// overlay that prevents the user from interacting with the screen.
   /// overlay that prevents the user from interacting with the screen.
@@ -186,15 +186,15 @@ class GetBar<T extends Object> extends StatefulWidget {
   /// Default is [Colors.transparent]. Only takes effect if [overlayBlur] > 0.0.
   /// Default is [Colors.transparent]. Only takes effect if [overlayBlur] > 0.0.
   /// Make sure you use a color with transparency here e.g.
   /// Make sure you use a color with transparency here e.g.
   /// Colors.grey[600].withOpacity(0.2).
   /// Colors.grey[600].withOpacity(0.2).
-  final Color overlayColor;
+  final Color? overlayColor;
 
 
   /// A [TextFormField] in case you want a simple user input.
   /// A [TextFormField] in case you want a simple user input.
   /// Every other widget is ignored if this is not null.
   /// Every other widget is ignored if this is not null.
-  final Form userInputForm;
+  final Form? userInputForm;
 
 
   /// Show the snack. It's call [SnackbarStatus.OPENING] state
   /// Show the snack. It's call [SnackbarStatus.OPENING] state
   /// followed by [SnackbarStatus.OPEN]
   /// followed by [SnackbarStatus.OPEN]
-  Future<T> show<T>() async {
+  Future<T?>? show<T>() async {
     return Get.showSnackbar(this);
     return Get.showSnackbar(this);
   }
   }
 
 
@@ -206,10 +206,10 @@ class GetBar<T extends Object> extends StatefulWidget {
 
 
 class _GetBarState<K extends Object> extends State<GetBar>
 class _GetBarState<K extends Object> extends State<GetBar>
     with TickerProviderStateMixin {
     with TickerProviderStateMixin {
-  SnackbarStatus currentStatus;
+  SnackbarStatus? currentStatus;
 
 
-  AnimationController _fadeController;
-  Animation<double> _fadeAnimation;
+  AnimationController? _fadeController;
+  late Animation<double> _fadeAnimation;
 
 
   final Widget _emptyWidget = SizedBox(width: 0.0, height: 0.0);
   final Widget _emptyWidget = SizedBox(width: 0.0, height: 0.0);
   final double _initialOpacity = 1.0;
   final double _initialOpacity = 1.0;
@@ -217,20 +217,20 @@ class _GetBarState<K extends Object> extends State<GetBar>
 
 
   final Duration _pulseAnimationDuration = Duration(seconds: 1);
   final Duration _pulseAnimationDuration = Duration(seconds: 1);
 
 
-  bool _isTitlePresent;
-  double _messageTopMargin;
+  late bool _isTitlePresent;
+  late double _messageTopMargin;
 
 
-  FocusScopeNode _focusNode;
-  FocusAttachment _focusAttachment;
+  FocusScopeNode? _focusNode;
+  late FocusAttachment _focusAttachment;
 
 
   @override
   @override
   void initState() {
   void initState() {
     super.initState();
     super.initState();
 
 
     assert(
     assert(
-        ((widget.userInputForm != null ||
-            ((widget.message != null && widget.message.isNotEmpty) ||
-                widget.messageText != null))),
+        widget.userInputForm != null ||
+            ((widget.message != null && widget.message!.isNotEmpty) ||
+                widget.messageText != null),
         """
         """
 A message is mandatory if you are not using userInputForm. 
 A message is mandatory if you are not using userInputForm. 
 Set either a message or messageText""");
 Set either a message or messageText""");
@@ -247,7 +247,7 @@ Set either a message or messageText""");
     }
     }
 
 
     _focusNode = FocusScopeNode();
     _focusNode = FocusScopeNode();
-    _focusAttachment = _focusNode.attach(context);
+    _focusAttachment = _focusNode!.attach(context);
   }
   }
 
 
   @override
   @override
@@ -258,14 +258,14 @@ Set either a message or messageText""");
     widget.progressIndicatorController?.dispose();
     widget.progressIndicatorController?.dispose();
 
 
     _focusAttachment.detach();
     _focusAttachment.detach();
-    _focusNode.dispose();
+    _focusNode!.dispose();
     super.dispose();
     super.dispose();
   }
   }
 
 
   final Completer<Size> _boxHeightCompleter = Completer<Size>();
   final Completer<Size> _boxHeightCompleter = Completer<Size>();
 
 
   void _configureLeftBarFuture() {
   void _configureLeftBarFuture() {
-    SchedulerBinding.instance.addPostFrameCallback(
+    SchedulerBinding.instance!.addPostFrameCallback(
       (_) {
       (_) {
         final keyContext = backgroundBoxKey.currentContext;
         final keyContext = backgroundBoxKey.currentContext;
 
 
@@ -282,24 +282,24 @@ Set either a message or messageText""");
         AnimationController(vsync: this, duration: _pulseAnimationDuration);
         AnimationController(vsync: this, duration: _pulseAnimationDuration);
     _fadeAnimation = Tween(begin: _initialOpacity, end: _finalOpacity).animate(
     _fadeAnimation = Tween(begin: _initialOpacity, end: _finalOpacity).animate(
       CurvedAnimation(
       CurvedAnimation(
-        parent: _fadeController,
+        parent: _fadeController!,
         curve: Curves.linear,
         curve: Curves.linear,
       ),
       ),
     );
     );
 
 
-    _fadeController.addStatusListener((status) {
+    _fadeController!.addStatusListener((status) {
       if (status == AnimationStatus.completed) {
       if (status == AnimationStatus.completed) {
-        _fadeController.reverse();
+        _fadeController!.reverse();
       }
       }
       if (status == AnimationStatus.dismissed) {
       if (status == AnimationStatus.dismissed) {
-        _fadeController.forward();
+        _fadeController!.forward();
       }
       }
     });
     });
 
 
-    _fadeController.forward();
+    _fadeController!.forward();
   }
   }
 
 
-  VoidCallback _progressListener;
+  late VoidCallback _progressListener;
 
 
   void _configureProgressIndicatorAnimation() {
   void _configureProgressIndicatorAnimation() {
     if (widget.showProgressIndicator &&
     if (widget.showProgressIndicator &&
@@ -307,10 +307,10 @@ Set either a message or messageText""");
       _progressListener = () {
       _progressListener = () {
         setState(() {});
         setState(() {});
       };
       };
-      widget.progressIndicatorController.addListener(_progressListener);
+      widget.progressIndicatorController!.addListener(_progressListener);
 
 
       _progressAnimation = CurvedAnimation(
       _progressAnimation = CurvedAnimation(
-          curve: Curves.linear, parent: widget.progressIndicatorController);
+          curve: Curves.linear, parent: widget.progressIndicatorController!);
     }
     }
   }
   }
 
 
@@ -361,10 +361,10 @@ Set either a message or messageText""");
                 borderRadius: BorderRadius.circular(widget.borderRadius),
                 borderRadius: BorderRadius.circular(widget.borderRadius),
                 child: BackdropFilter(
                 child: BackdropFilter(
                   filter: ImageFilter.blur(
                   filter: ImageFilter.blur(
-                      sigmaX: widget.barBlur, sigmaY: widget.barBlur),
+                      sigmaX: widget.barBlur!, sigmaY: widget.barBlur!),
                   child: Container(
                   child: Container(
-                    height: snapshot.data.height,
-                    width: snapshot.data.width,
+                    height: snapshot.data!.height,
+                    width: snapshot.data!.width,
                     decoration: BoxDecoration(
                     decoration: BoxDecoration(
                       color: Colors.transparent,
                       color: Colors.transparent,
                       borderRadius: BorderRadius.circular(widget.borderRadius),
                       borderRadius: BorderRadius.circular(widget.borderRadius),
@@ -386,7 +386,7 @@ Set either a message or messageText""");
     return Container(
     return Container(
       key: backgroundBoxKey,
       key: backgroundBoxKey,
       constraints: widget.maxWidth != null
       constraints: widget.maxWidth != null
-          ? BoxConstraints(maxWidth: widget.maxWidth)
+          ? BoxConstraints(maxWidth: widget.maxWidth!)
           : null,
           : null,
       decoration: BoxDecoration(
       decoration: BoxDecoration(
         color: widget.backgroundColor,
         color: widget.backgroundColor,
@@ -394,14 +394,14 @@ Set either a message or messageText""");
         boxShadow: widget.boxShadows,
         boxShadow: widget.boxShadows,
         borderRadius: BorderRadius.circular(widget.borderRadius),
         borderRadius: BorderRadius.circular(widget.borderRadius),
         border: widget.borderColor != null
         border: widget.borderColor != null
-            ? Border.all(color: widget.borderColor, width: widget.borderWidth)
+            ? Border.all(color: widget.borderColor!, width: widget.borderWidth!)
             : null,
             : null,
       ),
       ),
       child: Padding(
       child: Padding(
         padding: const EdgeInsets.only(
         padding: const EdgeInsets.only(
             left: 8.0, right: 8.0, bottom: 8.0, top: 16.0),
             left: 8.0, right: 8.0, bottom: 8.0, top: 16.0),
         child: FocusScope(
         child: FocusScope(
-          child: widget.userInputForm,
+          child: widget.userInputForm!,
           node: _focusNode,
           node: _focusNode,
           autofocus: true,
           autofocus: true,
         ),
         ),
@@ -409,14 +409,14 @@ Set either a message or messageText""");
     );
     );
   }
   }
 
 
-  CurvedAnimation _progressAnimation;
+  late CurvedAnimation _progressAnimation;
   GlobalKey backgroundBoxKey = GlobalKey();
   GlobalKey backgroundBoxKey = GlobalKey();
 
 
   Widget _generateSnack() {
   Widget _generateSnack() {
     return Container(
     return Container(
       key: backgroundBoxKey,
       key: backgroundBoxKey,
       constraints: widget.maxWidth != null
       constraints: widget.maxWidth != null
-          ? BoxConstraints(maxWidth: widget.maxWidth)
+          ? BoxConstraints(maxWidth: widget.maxWidth!)
           : null,
           : null,
       decoration: BoxDecoration(
       decoration: BoxDecoration(
         color: widget.backgroundColor,
         color: widget.backgroundColor,
@@ -424,7 +424,7 @@ Set either a message or messageText""");
         boxShadow: widget.boxShadows,
         boxShadow: widget.boxShadows,
         borderRadius: BorderRadius.circular(widget.borderRadius),
         borderRadius: BorderRadius.circular(widget.borderRadius),
         border: widget.borderColor != null
         border: widget.borderColor != null
-            ? Border.all(color: widget.borderColor, width: widget.borderWidth)
+            ? Border.all(color: widget.borderColor!, width: widget.borderWidth!)
             : null,
             : null,
       ),
       ),
       child: Column(
       child: Column(
@@ -618,7 +618,7 @@ Set either a message or messageText""");
             return Container(
             return Container(
               color: widget.leftBarIndicatorColor,
               color: widget.leftBarIndicatorColor,
               width: 5.0,
               width: 5.0,
-              height: snapshot.data.height,
+              height: snapshot.data!.height,
             );
             );
           } else {
           } else {
             return _emptyWidget;
             return _emptyWidget;
@@ -630,7 +630,7 @@ Set either a message or messageText""");
     }
     }
   }
   }
 
 
-  Widget _getIcon() {
+  Widget? _getIcon() {
     if (widget.icon != null && widget.icon is Icon && widget.shouldIconPulse) {
     if (widget.icon != null && widget.icon is Icon && widget.shouldIconPulse) {
       return FadeTransition(
       return FadeTransition(
         opacity: _fadeAnimation,
         opacity: _fadeAnimation,
@@ -659,7 +659,7 @@ Set either a message or messageText""");
     );
     );
   }
   }
 
 
-  Widget _getMainActionButton() {
+  Widget? _getMainActionButton() {
     return widget.mainButton;
     return widget.mainButton;
   }
   }
 }
 }

@@ -6,17 +6,17 @@ import '../../get_navigation.dart';
 import 'snack.dart';
 import 'snack.dart';
 
 
 class SnackRoute<T> extends OverlayRoute<T> {
 class SnackRoute<T> extends OverlayRoute<T> {
-  Animation<double> _filterBlurAnimation;
-  Animation<Color> _filterColorAnimation;
+  late Animation<double> _filterBlurAnimation;
+  late Animation<Color?> _filterColorAnimation;
 
 
   SnackRoute({
   SnackRoute({
-    @required this.snack,
-    RouteSettings settings,
+    required this.snack,
+    RouteSettings? settings,
   }) : super(settings: settings) {
   }) : super(settings: settings) {
     _builder = Builder(builder: (_) {
     _builder = Builder(builder: (_) {
       return GestureDetector(
       return GestureDetector(
         child: snack,
         child: snack,
-        onTap: snack.onTap != null ? () => snack.onTap(snack) : null,
+        onTap: snack.onTap != null ? () => snack.onTap!(snack) : null,
       );
       );
     });
     });
 
 
@@ -42,17 +42,17 @@ class SnackRoute<T> extends OverlayRoute<T> {
   }
   }
 
 
   GetBar snack;
   GetBar snack;
-  Builder _builder;
+  Builder? _builder;
 
 
   final Completer<T> _transitionCompleter = Completer<T>();
   final Completer<T> _transitionCompleter = Completer<T>();
 
 
-  SnackbarStatusCallback _snackbarStatus;
-  Alignment _initialAlignment;
-  Alignment _endAlignment;
+  late SnackbarStatusCallback _snackbarStatus;
+  Alignment? _initialAlignment;
+  Alignment? _endAlignment;
   bool _wasDismissedBySwipe = false;
   bool _wasDismissedBySwipe = false;
   bool _onTappedDismiss = false;
   bool _onTappedDismiss = false;
 
 
-  Timer _timer;
+  Timer? _timer;
 
 
   bool get opaque => false;
   bool get opaque => false;
 
 
@@ -93,7 +93,7 @@ class SnackRoute<T> extends OverlayRoute<T> {
         builder: (context) {
         builder: (context) {
           final Widget annotatedChild = Semantics(
           final Widget annotatedChild = Semantics(
             child: AlignTransition(
             child: AlignTransition(
-              alignment: _animation,
+              alignment: _animation!,
               child: snack.isDismissible
               child: snack.isDismissible
                   ? _getDismissibleSnack(_builder)
                   ? _getDismissibleSnack(_builder)
                   : _getSnack(),
                   : _getSnack(),
@@ -112,7 +112,7 @@ class SnackRoute<T> extends OverlayRoute<T> {
 
 
   String dismissibleKeyGen = "";
   String dismissibleKeyGen = "";
 
 
-  Widget _getDismissibleSnack(Widget child) {
+  Widget _getDismissibleSnack(Widget? child) {
     return Dismissible(
     return Dismissible(
       direction: _getDismissDirection(),
       direction: _getDismissDirection(),
       resizeDuration: null,
       resizeDuration: null,
@@ -130,9 +130,9 @@ class SnackRoute<T> extends OverlayRoute<T> {
         _wasDismissedBySwipe = true;
         _wasDismissedBySwipe = true;
 
 
         if (isCurrent) {
         if (isCurrent) {
-          navigator.pop();
+          navigator!.pop();
         } else {
         } else {
-          navigator.removeRoute(this);
+          navigator!.removeRoute(this);
         }
         }
       },
       },
       child: _getSnack(),
       child: _getSnack(),
@@ -159,16 +159,16 @@ class SnackRoute<T> extends OverlayRoute<T> {
 
 
   @override
   @override
   bool get finishedWhenPopped =>
   bool get finishedWhenPopped =>
-      _controller.status == AnimationStatus.dismissed;
+      _controller!.status == AnimationStatus.dismissed;
 
 
   /// The animation that drives the route's transition and the previous route's
   /// The animation that drives the route's transition and the previous route's
   /// forward transition.
   /// forward transition.
-  Animation<Alignment> _animation;
+  Animation<Alignment>? _animation;
 
 
   /// The animation controller that the route uses to drive the transitions.
   /// The animation controller that the route uses to drive the transitions.
   ///
   ///
   /// The animation itself is exposed by the [animation] property.
   /// The animation itself is exposed by the [animation] property.
-  AnimationController _controller;
+  AnimationController? _controller;
 
 
   /// Called to create the animation controller that will drive the transitions
   /// Called to create the animation controller that will drive the transitions
   /// to this route from the previous one, and back to the previous route
   /// to this route from the previous one, and back to the previous route
@@ -181,7 +181,7 @@ class SnackRoute<T> extends OverlayRoute<T> {
     return AnimationController(
     return AnimationController(
       duration: snack.animationDuration,
       duration: snack.animationDuration,
       debugLabel: debugLabel,
       debugLabel: debugLabel,
-      vsync: navigator,
+      vsync: navigator!,
     );
     );
   }
   }
 
 
@@ -194,7 +194,7 @@ class SnackRoute<T> extends OverlayRoute<T> {
     assert(_controller != null);
     assert(_controller != null);
     return AlignmentTween(begin: _initialAlignment, end: _endAlignment).animate(
     return AlignmentTween(begin: _initialAlignment, end: _endAlignment).animate(
       CurvedAnimation(
       CurvedAnimation(
-        parent: _controller,
+        parent: _controller!,
         curve: snack.forwardAnimationCurve,
         curve: snack.forwardAnimationCurve,
         reverseCurve: snack.reverseAnimationCurve,
         reverseCurve: snack.reverseAnimationCurve,
       ),
       ),
@@ -204,7 +204,7 @@ class SnackRoute<T> extends OverlayRoute<T> {
   Animation<double> createBlurFilterAnimation() {
   Animation<double> createBlurFilterAnimation() {
     return Tween(begin: 0.0, end: snack.overlayBlur).animate(
     return Tween(begin: 0.0, end: snack.overlayBlur).animate(
       CurvedAnimation(
       CurvedAnimation(
-        parent: _controller,
+        parent: _controller!,
         curve: Interval(
         curve: Interval(
           0.0,
           0.0,
           0.35,
           0.35,
@@ -214,11 +214,11 @@ class SnackRoute<T> extends OverlayRoute<T> {
     );
     );
   }
   }
 
 
-  Animation<Color> createColorFilterAnimation() {
+  Animation<Color?> createColorFilterAnimation() {
     return ColorTween(begin: Color(0x00000000), end: snack.overlayColor)
     return ColorTween(begin: Color(0x00000000), end: snack.overlayColor)
         .animate(
         .animate(
       CurvedAnimation(
       CurvedAnimation(
-        parent: _controller,
+        parent: _controller!,
         curve: Interval(
         curve: Interval(
           0.0,
           0.0,
           0.35,
           0.35,
@@ -228,8 +228,8 @@ class SnackRoute<T> extends OverlayRoute<T> {
     );
     );
   }
   }
 
 
-  T _result;
-  SnackbarStatus currentStatus;
+  T? _result;
+  SnackbarStatus? currentStatus;
 
 
   void _handleStatusChanged(AnimationStatus status) {
   void _handleStatusChanged(AnimationStatus status) {
     switch (status) {
     switch (status) {
@@ -258,7 +258,7 @@ class SnackRoute<T> extends OverlayRoute<T> {
         _snackbarStatus(currentStatus);
         _snackbarStatus(currentStatus);
 
 
         if (!isCurrent) {
         if (!isCurrent) {
-          navigator.finalizeRoute(this);
+          navigator!.finalizeRoute(this);
           // assert(overlayEntries.isEmpty);
           // assert(overlayEntries.isEmpty);
         }
         }
         break;
         break;
@@ -292,13 +292,13 @@ class SnackRoute<T> extends OverlayRoute<T> {
       !_transitionCompleter.isCompleted,
       !_transitionCompleter.isCompleted,
       'Cannot reuse a $runtimeType after disposing it.',
       'Cannot reuse a $runtimeType after disposing it.',
     );
     );
-    _animation.addStatusListener(_handleStatusChanged);
+    _animation!.addStatusListener(_handleStatusChanged);
     _configureTimer();
     _configureTimer();
-    return _controller.forward();
+    return _controller!.forward();
   }
   }
 
 
   @override
   @override
-  void didReplace(Route<dynamic> oldRoute) {
+  void didReplace(Route<dynamic>? oldRoute) {
     assert(
     assert(
       _controller != null,
       _controller != null,
       // ignore: lines_longer_than_80_chars
       // ignore: lines_longer_than_80_chars
@@ -310,14 +310,14 @@ class SnackRoute<T> extends OverlayRoute<T> {
     );
     );
 
 
     if (oldRoute is SnackRoute) {
     if (oldRoute is SnackRoute) {
-      _controller.value = oldRoute._controller.value;
+      _controller!.value = oldRoute._controller!.value;
     }
     }
-    _animation.addStatusListener(_handleStatusChanged);
+    _animation!.addStatusListener(_handleStatusChanged);
     super.didReplace(oldRoute);
     super.didReplace(oldRoute);
   }
   }
 
 
   @override
   @override
-  bool didPop(T result) {
+  bool didPop(T? result) {
     assert(
     assert(
       _controller != null,
       _controller != null,
       // ignore: lines_longer_than_80_chars
       // ignore: lines_longer_than_80_chars
@@ -333,12 +333,12 @@ class SnackRoute<T> extends OverlayRoute<T> {
 
 
     if (_wasDismissedBySwipe) {
     if (_wasDismissedBySwipe) {
       Timer(Duration(milliseconds: 200), () {
       Timer(Duration(milliseconds: 200), () {
-        _controller.reset();
+        _controller!.reset();
       });
       });
 
 
       _wasDismissedBySwipe = false;
       _wasDismissedBySwipe = false;
     } else {
     } else {
-      _controller.reverse();
+      _controller!.reverse();
     }
     }
 
 
     return super.didPop(result);
     return super.didPop(result);
@@ -346,26 +346,26 @@ class SnackRoute<T> extends OverlayRoute<T> {
 
 
   void _configureTimer() {
   void _configureTimer() {
     if (snack.duration != null) {
     if (snack.duration != null) {
-      if (_timer != null && _timer.isActive) {
-        _timer.cancel();
+      if (_timer != null && _timer!.isActive) {
+        _timer!.cancel();
       }
       }
-      _timer = Timer(snack.duration, () {
+      _timer = Timer(snack.duration!, () {
         if (isCurrent) {
         if (isCurrent) {
-          navigator.pop();
+          navigator!.pop();
         } else if (isActive) {
         } else if (isActive) {
-          navigator.removeRoute(this);
+          navigator!.removeRoute(this);
         }
         }
       });
       });
     } else {
     } else {
       if (_timer != null) {
       if (_timer != null) {
-        _timer.cancel();
+        _timer!.cancel();
       }
       }
     }
     }
   }
   }
 
 
   void _cancelTimer() {
   void _cancelTimer() {
-    if (_timer != null && _timer.isActive) {
-      _timer.cancel();
+    if (_timer != null && _timer!.isActive) {
+      _timer!.cancel();
     }
     }
   }
   }