Initial

resources/app/client/data/collections/compendium-packs.js

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+class CompendiumPacks extends DirectoryCollectionMixin(Collection) {
+
+  /**
+   * Get a Collection of Folders which contain Compendium Packs
+   * @returns {Collection<Folder>}
+   */
+  get folders() {
+    return game.folders.reduce((collection, folder) => {
+      if ( folder.type === "Compendium" ) {
+        collection.set(folder.id, folder);
+      }
+      return collection;
+    }, new foundry.utils.Collection());
+  }
+
+  /* -------------------------------------------- */
+
+  /** @override */
+  _getVisibleTreeContents() {
+    return this.contents.filter(pack => pack.visible);
+  }
+
+  /* -------------------------------------------- */
+
+  /** @override */
+  static _sortAlphabetical(a, b) {
+    if ( a.metadata && b.metadata ) return a.metadata.label.localeCompare(b.metadata.label, game.i18n.lang);
+    else return super._sortAlphabetical(a, b);
+  }
+}