upd

src/Source.js

@@ -91,7 +91,7 @@ class Source {
   }
 
   get apiVersion() {
-    return this.plugin.api || this.plugin.constructor.api || 1;
+    return this.plugin.api || 1;
   }
 
   /**
@@ -115,11 +115,11 @@ class Source {
    *
    * @param {User} user
    * @param {string} id
-   * @returns {Promise<PlaylistItemDesc?>}
+   * @returns {Promise<PlaylistItemDesc | undefined>}
    */
-  getOne(user, id) {
-    return this.get(user, [id])
-      .then((items) => items[0]);
+  async getOne(user, id) {
+    const [item] = await this.get(user, [id]);
+    return item;
   }
 
   /**
@@ -164,6 +164,10 @@ class Source {
 
   /**
    * Get playlists for a specific user from this media source.
+   *
+   * @param {User} user
+   * @param {string} userID
+   * @returns {Promise<unknown>}
    */
   async getUserPlaylists(user, userID) {
     if (this.apiVersion < 3 || !this.plugin.getUserPlaylists) {
@@ -177,6 +181,10 @@ class Source {
 
   /**
    * Get playlists for a specific user from this media source.
+   *
+   * @param {User} user
+   * @param {string} playlistID
+   * @returns {Promise<unknown>}
    */
   async getPlaylistItems(user, playlistID) {
     if (this.apiVersion < 3 || !this.plugin.getPlaylistItems) {
@@ -203,6 +211,9 @@ class Source {
     throw new SourceNoImportError({ name: this.type });
   }
 
+  /**
+   * @param {import('./Uwave')} uw
+   */
   static async plugin(uw, { source: SourcePlugin, baseOptions = {} }) {
     debug('registering plugin', SourcePlugin);
     if (SourcePlugin.api == null || SourcePlugin.api < 3) {

src/Uwave.js

@@ -273,7 +273,6 @@ class UwaveServer extends EventEmitter {
    *
    * @param {string} sourceType
    * @param {Source} source
-   * @private
    */
   insertSourceInternal(sourceType, source) {
     this.#sources.set(sourceType, source);
@@ -285,7 +284,6 @@ class UwaveServer extends EventEmitter {
    * Only source plugins using Media Source API 3 or higher can be removed.
    *
    * @param {string} sourceType
-   * @private
    */
   removeSourceInternal(sourceType) {
     const source = this.#sources.get(sourceType);

src/routes/sources.js

@@ -1,14 +1,14 @@
 'use strict';
 
-const router = require('router');
+const { Router } = require('express');
 const route = require('../route');
 const protect = require('../middleware/protect');
 const schema = require('../middleware/schema');
 const controller = require('../controllers/sources');
 const validations = require('../validations');
 
 function sourceRoutes() {
-  return router()
+  return Router()
     .use(protect())
     // GET /sources/:source/search - Search for media in a single source.
     .get(