Fixed import issues and aggregated exports.

src/player/PlayButton.js

@@ -1,6 +0,0 @@
-export default class PlayButton {
-
-    constructor() {
-
-    }
-}

src/player/PlaylistSong.js

@@ -1,5 +1,5 @@
-import Visualizer from "../Visualizer";
-import SongPlaylist from "./SongPlaylist";
+import Visualizer from "../visualization/Visualizer.js";
+import SongPlaylist from "./SongPlaylist.js";
 
 /**
  * A song with metadata that can be used as part of a {@link SongPlaylist}.

src/player/SongPlayer.js

@@ -1,5 +1,5 @@
 import "../styles/songplayer.css";
-import SongPlaylist from "./SongPlaylist";
+import SongPlaylist from "./SongPlaylist.js";
 
 /**
  * A player to play songs.

src/player/SongPlaylist.js

@@ -1,4 +1,4 @@
-import PlaylistSong from "./PlaylistSong";
+import PlaylistSong from "./PlaylistSong.js";
 
 /**
  * A playlist that holds a multitude of songs.

src/player/VisualizedSongPlayer.js

@@ -1,7 +1,7 @@
-import Visualizer from "../Visualizer";
-import VisualizerUpdateManager from "../VisualizerUpdateManager";
-import SongPlayer from "./SongPlayer";
-import SongPlaylist from "./SongPlaylist";
+import Visualizer from "../visualization/Visualizer.js";
+import VisualizerUpdateManager from "../visualization/VisualizerUpdateManager.js";
+import SongPlayer from "./SongPlayer.js";
+import SongPlaylist from "./SongPlaylist.js";
 
 /**
  * A song player that provides easier access to the current songs visualizer data.

src/player/player.js

@@ -0,0 +1,4 @@
+export { default as PlaylistSong } from "./PlaylistSong.js";
+export { default as SongPlayer } from "./SongPlayer.js";
+export { default as SongPlaylist } from "./SongPlaylist.js";
+export { default as VisualizedSongPlayer } from "./VisualizedSongPlayer.js";