migração flutter 2.2.1

lib/videos/api/youtube_classes.dart

@@ -1,12 +1,12 @@
 class YouTubeSearchResponse {
-	String kind;
-	String etag;
-	String nextPageToken;
-	String regionCode;
-	PageInfo pageInfo;
-	List<YouTubeItems> items;
-  int errorCode;
-  String errorMessage;  
+	String? kind;
+	String? etag;
+	String? nextPageToken;
+	String? regionCode;
+	PageInfo? pageInfo;
+	List<YouTubeItems>? items;
+  int? errorCode;
+  String? errorMessage;  
 
 	YouTubeSearchResponse({this.kind, this.etag, this.nextPageToken, this.regionCode, this.pageInfo, this.items,this.errorCode = 0, this.errorMessage = ''});
 
@@ -17,8 +17,8 @@ class YouTubeSearchResponse {
 		regionCode = json['regionCode'] ?? '';
 		pageInfo = json['pageInfo'] != null ? new PageInfo.fromJson(json['pageInfo']) : null;
 		if (json['items'] != null) {
-			items = new List<YouTubeItems>();
-			json['items'].forEach((v) { items.add(new YouTubeItems.fromJson(v)); });
+			items = <YouTubeItems>[];
+			json['items'].forEach((v) { items!.add(new YouTubeItems.fromJson(v)); });
 		}
     errorCode = 0;
     errorMessage = '';
@@ -26,8 +26,8 @@ class YouTubeSearchResponse {
 }
 
 class PageInfo {
-	int totalResults;
-	int resultsPerPage;
+	int? totalResults;
+	int? resultsPerPage;
 
 	PageInfo({this.totalResults, this.resultsPerPage});
 
@@ -45,10 +45,10 @@ class PageInfo {
 }
 
 class YouTubeItems {
-	String kind;
-	String etag;
-	Id id;
-	Snippet snippet;
+	String? kind;
+	String? etag;
+	Id? id;
+	Snippet? snippet;
 
 	YouTubeItems({this.kind, this.etag, this.id, this.snippet});
 
@@ -64,18 +64,18 @@ class YouTubeItems {
 		data['kind'] = this.kind;
 		data['etag'] = this.etag;
 		if (this.id != null) {
-      data['id'] = this.id.toJson();
+      data['id'] = this.id!.toJson();
     }
 		if (this.snippet != null) {
-      data['snippet'] = this.snippet.toJson();
+      data['snippet'] = this.snippet!.toJson();
     }
 		return data;
 	}
 }
 
 class Id {
-	String kind;
-	String videoId;
+	String? kind;
+	String? videoId;
 
 	Id({this.kind, this.videoId});
 
@@ -93,14 +93,14 @@ class Id {
 }
 
 class Snippet {
-	String publishedAt;
-	String channelId;
-	String title;
-	String description;
-	Thumbnails thumbnails;
-	String channelTitle;
-	String liveBroadcastContent;
-	String publishTime;
+	String? publishedAt;
+	String? channelId;
+	String? title;
+	String? description;
+	Thumbnails? thumbnails;
+	String? channelTitle;
+	String? liveBroadcastContent;
+	String? publishTime;
 
 	Snippet({this.publishedAt, this.channelId, this.title, this.description, this.thumbnails, this.channelTitle, this.liveBroadcastContent, this.publishTime});
 
@@ -122,7 +122,7 @@ class Snippet {
 		data['title'] = this.title;
 		data['description'] = this.description;
 		if (this.thumbnails != null) {
-      data['thumbnails'] = this.thumbnails.toJson();
+      data['thumbnails'] = this.thumbnails!.toJson();
     }
 		data['channelTitle'] = this.channelTitle;
 		data['liveBroadcastContent'] = this.liveBroadcastContent;
@@ -132,9 +132,9 @@ class Snippet {
 }
 
 class Thumbnails {
-	ThumbDefault thumbDefault;
-	ThumbDefault medium;
-	ThumbDefault high;
+	ThumbDefault? thumbDefault;
+	ThumbDefault? medium;
+	ThumbDefault? high;
 
 	Thumbnails({this.thumbDefault, this.medium, this.high});
 
@@ -147,22 +147,22 @@ class Thumbnails {
 	Map<String, dynamic> toJson() {
 		final Map<String, dynamic> data = new Map<String, dynamic>();
 		if (this.thumbDefault != null) {
-      data['default'] = this.thumbDefault.toJson();
+      data['default'] = this.thumbDefault!.toJson();
     }
 		if (this.medium != null) {
-      data['medium'] = this.medium.toJson();
+      data['medium'] = this.medium!.toJson();
     }
 		if (this.high != null) {
-      data['high'] = this.high.toJson();
+      data['high'] = this.high!.toJson();
     }
 		return data;
 	}
 }
 
 class ThumbDefault {
-	String url;
-	int width;
-	int height;
+	String? url;
+	int? width;
+	int? height;
 
 	ThumbDefault({this.url, this.width, this.height});