chore: fix dart and flutter analysis errors

Author: stnguyen90

templates/dart/base/requests/oauth.twig

@@ -16,10 +16,11 @@
     params.forEach((key, value) {
       if (value is List) { 
         for (var item in value) {
-          query.add(Uri.encodeComponent(key + '[]') + '=' + Uri.encodeComponent(item));
+          query.add(
+              '${Uri.encodeComponent('$key[]')}=${Uri.encodeComponent(item)}');
         }
       } else if (value != null) {
-        query.add(Uri.encodeComponent(key) + '=' + Uri.encodeComponent(value));
+        query.add('${Uri.encodeComponent(key)}=${Uri.encodeComponent(value)}');
       }
     });
 

templates/dart/lib/query.dart.twig

@@ -6,7 +6,7 @@ class Query {
   final String? attribute;
   final dynamic values;
 
-  Query._(this.method, [this.attribute = null, this.values = null]);
+  Query._(this.method, [this.attribute, this.values]);
 
   Map<String, dynamic> toJson() {
     final result = <String, dynamic>{};

templates/dart/lib/src/client.dart.twig

@@ -42,7 +42,7 @@ abstract class Client {
   ///
   /// {{header.description}}
 {% endif %}
-  Client set{{header.key | caseUcfirst}}(value);
+  Client set{{header.key | caseUcfirst}}(String value);
 
 {% endfor %}
   /// Add headers that should be sent with all API calls.

templates/dart/lib/src/client_mixin.dart.twig

@@ -45,7 +45,7 @@ mixin ClientMixin {
             return MapEntry(key, value.toString());
           }
           if (value is List) {
-            return MapEntry(key + "[]", value);
+            return MapEntry("$key[]", value);
           }
           return MapEntry(key, value);
         });

templates/flutter/base/requests/oauth.twig

@@ -16,10 +16,11 @@
         params.forEach((key, value) {
           if (value is List) { 
             for (var item in value) {
-              query.add(Uri.encodeComponent(key + '[]') + '=' + Uri.encodeComponent(item));
+              query.add(
+              '${Uri.encodeComponent('$key[]')}=${Uri.encodeComponent(item)}');
             }
           } else if(value != null) {
-              query.add(Uri.encodeComponent(key) + '=' + Uri.encodeComponent(value));
+              query.add('${Uri.encodeComponent(key)}=${Uri.encodeComponent(value)}');
           }
         });
 

templates/flutter/lib/src/client.dart.twig

@@ -61,7 +61,7 @@ abstract class Client {
   ///
   /// {{header.description}}.
 {% endif %}
-  Client set{{header.key | caseUcfirst}}(value);
+  Client set{{header.key | caseUcfirst}}(String value);
 
 {% endfor %}
   /// Add headers that should be sent with all API calls.

templates/flutter/lib/src/client_io.dart.twig

@@ -181,7 +181,7 @@ class ClientIO extends ClientBase with ClientMixin {
     } catch (e) {
       debugPrint('Error getting device info: $e');
       device = Platform.operatingSystem;
-      addHeader('user-agent', '$device');
+      addHeader('user-agent', device);
     }
 
     _initialized = true;

templates/flutter/lib/src/client_mixin.dart.twig

@@ -45,7 +45,7 @@ mixin ClientMixin {
             return MapEntry(key, value.toString());
           }
           if (value is List) {
-            return MapEntry(key + "[]", value);
+            return MapEntry("$key[]", value);
           }
           return MapEntry(key, value);
         });

templates/flutter/lib/src/realtime_io.dart.twig

@@ -32,10 +32,10 @@ class RealtimeIO extends RealtimeBase with RealtimeMixin {
     final cookies = await (client as ClientIO).cookieJar.loadForRequest(uri);
     headers = {HttpHeaders.cookieHeader: CookieManager.getCookies(cookies)};
 
-    final _websok = IOWebSocketChannel((client as ClientIO).selfSigned
+    final websok = IOWebSocketChannel((client as ClientIO).selfSigned
         ? await _connectForSelfSignedCert(uri, headers)
         : await WebSocket.connect(uri.toString(), headers: headers));
-    return _websok;
+    return websok;
   }
 
   /// Subscribe

templates/flutter/lib/src/realtime_mixin.dart.twig

@@ -21,7 +21,7 @@ mixin RealtimeMixin {
   late WebSocketFactory getWebSocket;
   GetFallbackCookie? getFallbackCookie;
   int? get closeCode => _websok?.closeCode;
-  Map<int, RealtimeSubscription> _subscriptions = {};
+  final Map<int, RealtimeSubscription> _subscriptions = {};
   bool _reconnect = true;
   int _retries = 0;
   StreamSubscription? _websocketSubscription;
@@ -53,7 +53,7 @@ mixin RealtimeMixin {
     _heartbeatTimer = null;
   }
 
-  _createSocket() async {
+  Future<void> _createSocket() async {
     if(_creatingSocket || _channels.isEmpty) return;
     _creatingSocket = true;
     final uri = _prepareUri();
@@ -164,7 +164,7 @@ mixin RealtimeMixin {
         "project": client.config['project'],
         "channels[]": _channels.toList(),
       },
-      path: uri.path + "/realtime",
+      path: "${uri.path}/realtime",
     );
   }