feat(parser): Update LiveChatBanner (#840)

* Mark `viewerIsCreator` property as optional
* Mark `background_type` property as optional
* Add `banner_type` property
* Add `banner_properties_is_ephemeral` property
* Add `banner_properties_auto_collapse_delay_seconds` property

src/parser/classes/livechat/items/LiveChatBanner.ts

@@ -9,19 +9,46 @@ export default class LiveChatBanner extends YTNode {
   header: LiveChatBannerHeader | null;
   contents: YTNode;
   action_id: string;
-  viewer_is_creator: boolean;
+  viewer_is_creator?: boolean;
   target_id: string;
   is_stackable: boolean;
-  background_type: string;
+  background_type?: string;
+  banner_type: string;
+  banner_properties_is_ephemeral?: boolean;
+  banner_properties_auto_collapse_delay_seconds?: string;
 
   constructor(data: RawNode) {
     super();
     this.header = Parser.parseItem(data.header, LiveChatBannerHeader);
     this.contents = Parser.parseItem(data.contents);
     this.action_id = data.actionId;
-    this.viewer_is_creator = data.viewerIsCreator;
+
+    if (Reflect.has(data, 'viewerIsCreator')) {
+      this.viewer_is_creator = data.viewerIsCreator;
+    }
+
     this.target_id = data.targetId;
     this.is_stackable = data.isStackable;
-    this.background_type = data.backgroundType;
+
+    if (Reflect.has(data, 'backgroundType')) {
+      this.background_type = data.backgroundType;
+    }
+
+    this.banner_type = data.bannerType;
+
+    if (
+      Reflect.has(data, 'bannerProperties') &&
+      Reflect.has(data.bannerProperties, 'isEphemeral')
+    ) {
+      this.banner_properties_is_ephemeral = Boolean(data.bannerProperties.isEphemeral);
+    }
+
+    if (
+      Reflect.has(data, 'bannerProperties') &&
+      Reflect.has(data.bannerProperties, 'autoCollapseDelay') &&
+      Reflect.has(data.bannerProperties.autoCollapseDelay, 'seconds')
+    ) {
+      this.banner_properties_auto_collapse_delay_seconds = data.bannerProperties.autoCollapseDelay.seconds;
+    }
   }
 }