More stuff

dataTypes.ts

@@ -11,7 +11,7 @@ export class Song {
 }
 
 export class PlayingSong extends Song {
-    constructor(type: SongType, title: string, songId: string, image: string, public position: number) {
+    constructor(type: SongType, title: string, songId: string, image: string, public length: number, public position: number) {
         super(type, title, songId, image);
     }
 }