Fix all analyzer issues in the mapper package

This commit resolves all analyzer warnings in the `mapper` package. The changes include:

- Removing numerous unused imports across various files to improve code clarity and reduce clutter.
- Eliminating unnecessary `this` qualifiers to adhere to Dart's recommended style guidelines.
- Correctly handling the `reflectable_builder` dependency by keeping it in `dev_dependencies` and suppressing the `depend_on_referenced_packages` warning with an `// ignore` comment. This resolves the analyzer issue without incorrectly modifying the package's dependencies.

Author: google-labs-jules[bot]

mapper/lib/src/builder/builder.dart

@@ -3,7 +3,7 @@ import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/dart/element/element.dart' show LibraryElementImpl;
 import 'package:build/build.dart';
 import 'package:pubspec_parse/pubspec_parse.dart';
-// ignore: implementation_imports
+// ignore: implementation_imports, depend_on_referenced_packages
 import 'package:reflectable_builder/src/builder_implementation.dart'
     show BuilderImplementation;
 

mapper/lib/src/logic/deserialization_handler.dart

@@ -2,11 +2,6 @@ import 'dart:convert' show JsonEncoder, JsonDecoder;
 
 import 'package:dart_json_mapper/dart_json_mapper.dart';
 
-import '../class_info.dart';
-import '../errors.dart';
-import '../identifier_casing.dart';
-import '../json_map.dart';
-import '../model/index.dart';
 import 'property_handler.dart';
 import 'reflection_handler.dart';
 
@@ -115,7 +110,7 @@ class DeserializationHandler {
               ? fieldValue.map((key, value) => MapEntry(skipPrefix(metaName, key, propertyContext.caseStyle), value))
               : fieldValue;
 
-          im.invokeSetter(name, this.deserializeObject(objectToDeserialize, propertyContext));
+          im.invokeSetter(name, deserializeObject(objectToDeserialize, propertyContext));
           return;
         }
         if (im.invokeGetter(name) == null &&
@@ -128,7 +123,7 @@ class DeserializationHandler {
         }
       }
       fieldValue = property.raw
-          ? this.deserializeObject(fieldValue, propertyContext)
+          ? deserializeObject(fieldValue, propertyContext)
           : property.value;
       if (isGetterOnly) {
         if (inheritedPublicFieldNames.contains(name) &&
@@ -200,7 +195,7 @@ class DeserializationHandler {
           objectClassInfo.getDeclarationMirror(discriminatorProperty);
       if (declarationMirror != null) {
         final discriminatorType = ReflectionHandler.getDeclarationType(declarationMirror);
-        final value = this.deserializeObject(discriminatorValue,
+        final value = deserializeObject(discriminatorValue,
             context.reBuild(typeInfo: _mapper.typeInfoHandler.getTypeInfo(discriminatorType)));
         if (value is Type) {
           return _mapper.typeInfoHandler.getTypeInfo(value);
@@ -273,7 +268,7 @@ class DeserializationHandler {
       String? jsonNameForVisitor;
 
       if (meta?.flatten == true) {
-        finalValueForVisitor = this.deserializeObject(jsonMap.map, propertyContext.reBuild(jsonPropertyMeta: null));
+        finalValueForVisitor = deserializeObject(jsonMap.map, propertyContext.reBuild(jsonPropertyMeta: null));
         jsonNameForVisitor = context.transformIdentifier(meta?.name ?? name);
       } else {
         final property = _mapper.propertyHandler.resolveProperty(
@@ -288,7 +283,7 @@ class DeserializationHandler {
                     : defaultValueFromCallback);
         jsonNameForVisitor = property.name;
         if (property.raw) {
-            finalValueForVisitor = this.deserializeObject(property.value, propertyContext);
+            finalValueForVisitor = deserializeObject(property.value, propertyContext);
         } else {
             finalValueForVisitor = property.value;
         }

mapper/lib/src/logic/serialization_handler.dart

@@ -1,12 +1,6 @@
-import 'dart:convert' show JsonEncoder, JsonDecoder;
+import 'dart:convert' show JsonDecoder;
 
 import 'package:dart_json_mapper/dart_json_mapper.dart';
-
-import '../class_info.dart';
-import '../errors.dart';
-import '../identifier_casing.dart';
-import '../json_map.dart';
-import '../model/index.dart';
 import 'reflection_handler.dart';
 
 class SerializationHandler {
@@ -83,7 +77,7 @@ class SerializationHandler {
       } else {
         if (meta?.flatten == true) {
           final Map flattenedPropertiesMap =
-              this.serializeObject(property.value, propertyContext);
+              serializeObject(property.value, propertyContext);
           final metaName = meta?.name;
           final fieldPrefixWords = metaName != null
               ? toWords(metaName, propertyContext.caseStyle).join(' ')
@@ -110,7 +104,7 @@ class SerializationHandler {
           _mapper.converterHandler.configureConverter(actualConverter, propertyContext, value: valueToConvert);
           convertedValue = _mapper.converterHandler.getConvertedValue(actualConverter, valueToConvert, propertyContext);
         } else {
-          convertedValue = this.serializeObject(property.value, propertyContext);
+          convertedValue = serializeObject(property.value, propertyContext);
         }
       }
       result.setPropertyValue(property.name, convertedValue ?? meta?.defaultValue);

mapper/lib/src/mapper.dart

@@ -5,8 +5,6 @@ import 'package:dart_json_mapper/src/model/index.dart';
 
 import 'class_info.dart';
 import 'errors.dart';
-import 'globals.dart';
-import 'json_map.dart';
 import 'logic/converter_handler.dart';
 import 'logic/deserialization_handler.dart';
 import 'logic/property_handler.dart';

mapper/lib/src/model/adapters.dart

@@ -13,7 +13,6 @@ import 'package:reflectable/src/reflectable_builder_based.dart'
     show ReflectorData;
 
 import '../model/index.dart' show Enum;
-import '../class_info.dart';
 import '../globals.dart';
 import 'converters.dart';
 import 'type_info.dart';

mapper/lib/src/model/annotations.dart

@@ -1,7 +1,6 @@
 import 'package:meta/meta_meta.dart';
 import 'package:reflectable/reflectable.dart';
 
-import '../identifier_casing.dart';
 import 'index.dart';
 
 /// [jsonConstructor] is used as a shorthand metadata w/o "()"

mapper/lib/src/model/converters/bigint_converter.dart

@@ -1,5 +1,4 @@
 import '../index.dart';
-import 'base_converter.dart';
 
 const bigIntConverter = BigIntConverter();
 

mapper/lib/src/model/converters/date_converter.dart

@@ -1,7 +1,6 @@
 import 'package:intl/intl.dart';
 
 import '../index.dart';
-import 'base_converter.dart';
 
 const dateConverter = DateConverter();
 

mapper/lib/src/model/converters/default_converter.dart

@@ -1,7 +1,6 @@
 import 'dart:convert' show JsonEncoder;
 
 import '../index.dart';
-import 'base_converter.dart';
 
 const defaultConverter = DefaultConverter();
 

mapper/lib/src/model/converters/default_iterable_converter.dart

@@ -1,5 +1,4 @@
 import '../index.dart';
-import 'base_converter.dart';
 
 final defaultIterableConverter = DefaultIterableConverter();