All models now implement `EquatableMixin`

lib/src/channels/channel.dart

@@ -1,7 +1,9 @@
+import 'package:equatable/equatable.dart';
+
 import 'channel_id.dart';
 
 /// YouTube channel metadata.
-class Channel {
+class Channel with EquatableMixin {
   /// Channel ID.
   final ChannelId id;
 
@@ -19,4 +21,7 @@ class Channel {
 
   @override
   String toString() => 'Channel ($title)';
+
+  @override
+  List<Object> get props => [id];
 }

lib/src/channels/channel_id.dart

@@ -3,7 +3,7 @@ import 'package:equatable/equatable.dart';
 import '../extensions/helpers_extension.dart';
 
 /// Encapsulates a valid YouTube channel ID.
-class ChannelId extends Equatable {
+class ChannelId with EquatableMixin {
   /// ID as a string.
   final String value;
 

lib/src/playlists/playlist.dart

@@ -1,8 +1,10 @@
+import 'package:equatable/equatable.dart';
+
 import '../common/common.dart';
 import 'playlist_id.dart';
 
 /// YouTube playlist metadata.
-class Playlist {
+class Playlist with EquatableMixin {
   /// Playlist ID.
   final PlaylistId id;
 
@@ -27,4 +29,7 @@ class Playlist {
 
   @override
   String toString() => 'Playlist ($title)';
+
+  @override
+  List<Object> get props => [id];
 }

lib/src/playlists/playlist_id.dart

@@ -1,7 +1,9 @@
+import 'package:equatable/equatable.dart';
+
 import '../extensions/helpers_extension.dart';
 
 /// Encapsulates a valid YouTube playlist ID.
-class PlaylistId {
+class PlaylistId with EquatableMixin {
   static final _regMatchExp =
       RegExp(r'youtube\..+?/playlist.*?list=(.*?)(?:&|/|$)');
   static final _compositeMatchExp = RegExp(
@@ -104,4 +106,7 @@ class PlaylistId {
     }
     return PlaylistId(obj.toString());
   }
+
+  @override
+  List<Object> get props => [value];
 }

lib/src/videos/video.dart

@@ -1,10 +1,12 @@
 import 'dart:collection';
 
+import 'package:equatable/equatable.dart';
+
 import '../common/common.dart';
 import 'video_id.dart';
 
 /// YouTube video metadata.
-class Video {
+class Video with EquatableMixin {
   /// Video ID.
   final VideoId id;
 
@@ -50,4 +52,7 @@ class Video {
 
   @override
   String toString() => 'Video ($title)';
+
+  @override
+  List<Object> get props => [id];
 }

lib/src/videos/video_id.dart

@@ -3,7 +3,7 @@ import 'package:equatable/equatable.dart';
 import '../extensions/helpers_extension.dart';
 
 /// Encapsulates a valid YouTube video ID.
-class VideoId extends Equatable {
+class VideoId with EquatableMixin {
   static final _regMatchExp = RegExp(r'youtube\..+?/watch.*?v=(.*?)(?:&|/|$)');
   static final _shortMatchExp = RegExp(r'youtu\.be/(.*?)(?:\?|&|/|$)');
   static final _embedMatchExp = RegExp(r'youtube\..+?/embed/(.*?)(?:\?|&|/|$)');