feat: enable to json for every serializable model

lib/src/models/album.dart

@@ -4,12 +4,15 @@
 part of '_models.dart';
 
 /// Json representation of an album
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class Album extends AlbumSimple {
   Album();
 
   factory Album.fromJson(Map<String, dynamic> json) => _$AlbumFromJson(json);
 
+  @override
+  Map<String, dynamic> toJson() => _$AlbumToJson(this);
+
   /// The copyright statements of the album.
   List<Copyright>? copyrights;
 
@@ -34,13 +37,15 @@ class Album extends AlbumSimple {
   int? popularity;
 }
 
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class AlbumSimple extends Object {
   AlbumSimple();
 
   factory AlbumSimple.fromJson(Map<String, dynamic> json) =>
       _$AlbumSimpleFromJson(json);
 
+  Map<String, dynamic> toJson() => _$AlbumSimpleToJson(this);
+
   /// Helper function that unwraps the items from the paging object.
   static Iterable<TrackSimple> _extractTracksFromPage(dynamic json) {
     if (json == null) {

lib/src/models/artist.dart

@@ -4,12 +4,15 @@
 part of '_models.dart';
 
 /// Json representation of an artist
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class Artist extends Object implements ArtistSimple {
   Artist();
 
   factory Artist.fromJson(Map<String, dynamic> json) => _$ArtistFromJson(json);
 
+  @override
+  Map<String, dynamic> toJson() => _$ArtistToJson(this);
+
   /// Known external URLs for this artist.
   @JsonKey(name: 'external_urls')
   @override
@@ -56,13 +59,15 @@ class Artist extends Object implements ArtistSimple {
 }
 
 /// Json representation of a simplified artist
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class ArtistSimple extends Object {
   ArtistSimple();
 
   factory ArtistSimple.fromJson(Map<String, dynamic> json) =>
       _$ArtistSimpleFromJson(json);
 
+  Map<String, dynamic> toJson() => _$ArtistSimpleToJson(this);
+
   /// Known external URLs for this artist.
   @JsonKey(name: 'external_urls')
   ExternalUrls? externalUrls;

lib/src/models/audio_analysis.dart

@@ -4,13 +4,15 @@
 part of '_models.dart';
 
 /// JSON representation of a track's analysis information
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class AudioAnalysis extends Object {
   AudioAnalysis();
 
   factory AudioAnalysis.fromJson(Map<String, dynamic> json) =>
       _$AudioAnalysisFromJson(json);
 
+  Map<String, dynamic> toJson() => _$AudioAnalysisToJson(this);
+
   TrackAudioAnalysis? track;
 
   List<TimeInterval>? bars;
@@ -86,13 +88,15 @@ abstract class _Section {
 }
 
 /// JSON representation of the track analysis summary
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class TrackAudioAnalysis extends _Section {
   TrackAudioAnalysis();
 
   factory TrackAudioAnalysis.fromJson(Map<String, dynamic> json) =>
       _$TrackAudioAnalysisFromJson(json);
 
+  Map<String, dynamic> toJson() => _$TrackAudioAnalysisToJson(this);
+
   /// The exact number of audio samples analyzed from this track.
   /// See also [analysisSampleRate].
   @JsonKey(name: 'num_samples', fromJson: convertToIntIfDoubleValue)
@@ -143,24 +147,26 @@ class TrackAudioAnalysis extends _Section {
 }
 
 /// JSON representation of track section in the analysis
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class Section extends _Section {
   Section();
 
   factory Section.fromJson(Map<String, dynamic> json) =>
       _$SectionFromJson(json);
+  Map<String, dynamic> toJson() => _$SectionToJson(this);
 
   /// The starting point (in seconds) of the section.
   double? start;
 }
 
 /// JSON representation of track segment in the analysis
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class Segment extends Object {
   Segment();
 
   factory Segment.fromJson(Map<String, dynamic> json) =>
       _$SegmentFromJson(json);
+  Map<String, dynamic> toJson() => _$SegmentToJson(this);
 
   /// The starting point (in seconds) of the segment.
   double? start;
@@ -215,12 +221,13 @@ class Segment extends Object {
 
 /// JSON representation of a time interval inside [AudioAnalysis.bars],
 /// [AudioAnalysis.beats] and [AudioAnalysis.tatums],
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class TimeInterval extends Object {
   TimeInterval();
 
   factory TimeInterval.fromJson(Map<String, dynamic> json) =>
       _$TimeIntervalFromJson(json);
+  Map<String, dynamic> toJson() => _$TimeIntervalToJson(this);
 
   /// The confidence, from `0.0` to `1.0`, of the reliability of the interval.
   double? confidence;

lib/src/models/audio_feature.dart

@@ -4,13 +4,15 @@
 part of '_models.dart';
 
 /// Json representation of an audio feature
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class AudioFeature extends Object {
   AudioFeature();
 
   factory AudioFeature.fromJson(Map<String, dynamic> json) =>
       _$AudioFeatureFromJson(json);
 
+  Map<String, dynamic> toJson() => _$AudioFeatureToJson(this);
+
   /// A confidence measure from `0.0` to `1.0` of whether the track is acoustic.
   /// `1.0` represents high confidence the track is acoustic.
   double? acousticness;

lib/src/models/category.dart

@@ -1,13 +1,15 @@
 part of '_models.dart';
 
 /// Json representation of a category
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class Category extends Object {
   Category();
 
   factory Category.fromJson(Map<String, dynamic> json) =>
       _$CategoryFromJson(json);
 
+  Map<String, dynamic> toJson() => _$CategoryToJson(this);
+
   /// A link to the Web API endpoint returning full details of the category.
   String? href;
 

lib/src/models/copyright.dart

@@ -4,13 +4,15 @@
 part of '_models.dart';
 
 /// Json representation of copyright
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class Copyright extends Object {
   Copyright();
 
   factory Copyright.fromJson(Map<String, dynamic> json) =>
       _$CopyrightFromJson(json);
 
+  Map<String, dynamic> toJson() => _$CopyrightToJson(this);
+
   /// The copyright text for this album.
   String? text;
 

lib/src/models/device.dart

@@ -6,12 +6,14 @@
 part of '_models.dart';
 
 /// Json representation of a device
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class Device extends Object {
   Device();
 
   factory Device.fromJson(Map<String, dynamic> json) => _$DeviceFromJson(json);
 
+  Map<String, dynamic> toJson() => _$DeviceToJson(this);
+
   /// The device ID. This may be `null`.
   String? id;
 

lib/src/models/episode.dart

@@ -4,7 +4,7 @@
 part of '_models.dart';
 
 /// Json representation of an episode
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class Episode extends Object {
   Episode();
 
@@ -75,15 +75,20 @@ class Episode extends Object {
 
   factory Episode.fromJson(Map<String, dynamic> json) =>
       _$EpisodeFromJson(json);
+
+  Map<String, dynamic> toJson() => _$EpisodeToJson(this);
 }
 
 /// Json representation of an episode with information about its show
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class EpisodeFull extends Episode {
   EpisodeFull();
 
   Show? show;
 
   factory EpisodeFull.fromJson(Map<String, dynamic> json) =>
       _$EpisodeFullFromJson(json);
+
+  @override
+  Map<String, dynamic> toJson() => _$EpisodeFullToJson(this);
 }

lib/src/models/error.dart

@@ -4,13 +4,15 @@
 part of '_models.dart';
 
 /// Json representation of an API error
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class SpotifyError extends Object {
   SpotifyError();
 
   factory SpotifyError.fromJson(Map<String, dynamic> json) =>
       _$SpotifyErrorFromJson(json);
 
+  Map<String, dynamic> toJson() => _$SpotifyErrorToJson(this);
+
   /// The HTTP status code (also returned in the response header; see Response
   /// Status Codes for more information).
   @JsonKey(fromJson: convertToIntIfDoubleValue)

lib/src/models/external_objects.dart

@@ -4,25 +4,29 @@
 part of '_models.dart';
 
 /// Json representation of an external url
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class ExternalUrls extends Object {
   ExternalUrls();
 
   factory ExternalUrls.fromJson(Map<String, dynamic> json) =>
       _$ExternalUrlsFromJson(json);
 
+  Map<String, dynamic> toJson() => _$ExternalUrlsToJson(this);
+
   /// The Spotify URL for the object.
   String? spotify;
 }
 
 /// Json representation of an external id
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class ExternalIds extends Object {
   ExternalIds();
 
   factory ExternalIds.fromJson(Map<String, dynamic> json) =>
       _$ExternalIdsFromJson(json);
 
+  Map<String, dynamic> toJson() => _$ExternalIdsToJson(this);
+
   /// International Standard Recording Code
   String? isrc;
 

lib/src/models/followers.dart

@@ -4,13 +4,15 @@
 part of '_models.dart';
 
 /// Json representation of followers
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class Followers extends Object {
   Followers();
 
   factory Followers.fromJson(Map<String, dynamic> json) =>
       _$FollowersFromJson(json);
 
+  Map<String, dynamic> toJson() => _$FollowersToJson(this);
+
   /// A link to the Web API endpoint providing full details of the followers;
   /// null if not available.
   ///

lib/src/models/image.dart

@@ -4,12 +4,14 @@
 part of '_models.dart';
 
 /// Json representation of an image
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class Image extends Object {
   Image();
 
   factory Image.fromJson(Map<String, dynamic> json) => _$ImageFromJson(json);
 
+  Map<String, dynamic> toJson() => _$ImageToJson(this);
+
   /// The image height in pixels. If unknown: null or not returned.
   @JsonKey(fromJson: convertToIntIfDoubleValue)
   int? height;

lib/src/models/paging.dart

@@ -41,12 +41,14 @@ class BasePaging<T> extends Object {
 }
 
 /// Json representation of a page with offset information
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class Paging<T> extends BasePaging<T> {
   Paging();
 
   factory Paging.fromJson(Map<String, dynamic> json) => _$PagingFromJson(json);
 
+  Map<String, dynamic> toJson() => _$PagingToJson(this);
+
   /// The offset of the items returned (as set in the query or by default).
   @JsonKey(fromJson: convertToIntIfDoubleValue)
   int? offset;
@@ -60,21 +62,25 @@ class Paging<T> extends BasePaging<T> {
 }
 
 /// Json representation of a page with cursor information
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class CursorPaging<T> extends BasePaging<T> {
   CursorPaging();
 
   factory CursorPaging.fromJson(Map<String, dynamic> json) =>
       _$CursorPagingFromJson(json);
 
+  Map<String, dynamic> toJson() => _$CursorPagingToJson(this);
+
   Cursor? cursors;
 }
 
 /// Json representation of a cursor
-@JsonSerializable(createToJson: false)
+@JsonSerializable()
 class Cursor extends Object {
   factory Cursor.fromJson(Map<String, dynamic> json) => _$CursorFromJson(json);
 
+  Map<String, dynamic> toJson() => _$CursorToJson(this);
+
   Cursor();
   String? after;
 }