refactor(ytmusic): rewrite Artist to TypeScript

src/parser/ytmusic/Artist.js

@@ -1,35 +0,0 @@
-import Parser from '../index';
-import { observe } from '../helpers';
-
-class Artist {
-  #page;
-  #actions;
-
-  /**
-   * @param {object} response - API response.
-   * @param {import('../../core/Actions').default} actions
-   */
-  constructor(response, actions) {
-    this.#page = Parser.parseResponse(response.data);
-    this.#actions = actions;
-
-    this.header = this.page.header;
-
-    const music_shelf = this.#page.contents_memo.get('MusicShelf');
-    const music_carousel_shelf = this.#page.contents_memo.get('MusicCarouselShelf');
-
-    /** @type {import('../classes/MusicShelf')[] | import('../classes/MusicCarouselShelf')[]} */
-    this.sections = observe([ ...music_shelf, ...music_carousel_shelf ]);
-  }
-
-  async getAllSongs() {
-    const shelf = this.sections.get({ type: 'MusicShelf' });
-    const page = await shelf.endpoint.call(this.#actions, 'YTMUSIC');
-    return page.contents_memo.get('MusicPlaylistShelf')?.[0] || [];
-  }
-
-  get page() {
-    return this.#page;
-  }
-}
-export default Artist;

src/parser/ytmusic/Artist.ts

@@ -0,0 +1,54 @@
+import Parser, { ParsedResponse } from '../index';
+import Actions, { AxioslikeResponse } from '../../core/Actions';
+import { InnertubeError } from '../../utils/Utils';
+
+import MusicShelf from '../classes/MusicShelf';
+import MusicCarouselShelf from '../classes/MusicCarouselShelf';
+import MusicPlaylistShelf from '../classes/MusicPlaylistShelf';
+import MusicImmersiveHeader from '../classes/MusicImmersiveHeader';
+
+class Artist {
+  #page;
+  #actions;
+
+  header;
+  sections;
+
+  constructor(response: AxioslikeResponse | ParsedResponse, actions: Actions) {
+    this.#page = Parser.parseResponse((response as AxioslikeResponse).data);
+    this.#actions = actions;
+
+    this.header = this.page.header.item().as(MusicImmersiveHeader);
+
+    const music_shelf = this.#page.contents_memo.get('MusicShelf') as MusicShelf[];
+    const music_carousel_shelf = this.#page.contents_memo.get('MusicCarouselShelf') as MusicCarouselShelf[];
+
+    this.sections = [ ...music_shelf, ...music_carousel_shelf ];
+  }
+
+  async getAllSongs(): Promise<MusicPlaylistShelf | null> {
+    const music_shelves = this.sections.filter((section) => section.type === 'MusicShelf') as MusicShelf[];
+
+    if (!music_shelves.length)
+      throw new InnertubeError('Could not find any node of type MusicShelf.');
+
+    const shelf = music_shelves.find((shelf) => shelf.title === 'Songs') as MusicShelf;
+
+    if (!shelf)
+      throw new InnertubeError('Could not find target shelf (Songs).');
+
+    if (!shelf.endpoint)
+      throw new InnertubeError('Target shelf (Songs) did not have an endpoint.');
+
+    const page = await shelf.endpoint.call(this.#actions, 'YTMUSIC', true) as ParsedResponse;
+    const contents = page.contents_memo.get('MusicPlaylistShelf')?.[0]?.as(MusicPlaylistShelf) || null;
+
+    return contents;
+  }
+
+  get page(): ParsedResponse {
+    return this.#page;
+  }
+}
+
+export default Artist;