内部データを用いた取得テスト

src/background/service-worker.ts

@@ -0,0 +1,27 @@
+import browser from "webextension-polyfill";
+import type { Message } from "../shared/messages";
+import { savePlaylist, getPlaylist } from "../shared/storage";
+
+const LOG_PREFIX = "[yt-playlist-features:bg]";
+
+browser.runtime.onMessage.addListener(
+  async (message: unknown, _sender: browser.Runtime.MessageSender) => {
+    const msg = message as Message;
+
+    if (msg.type === "PLAYLIST_EXTRACTED") {
+      console.log(
+        LOG_PREFIX,
+        `Saving playlist: "${msg.data.metadata.title}" (${msg.data.extractedCount} videos)`,
+      );
+      await savePlaylist(msg.data);
+      return;
+    }
+
+    if (msg.type === "GET_PLAYLIST") {
+      const data = await getPlaylist(msg.playlistId);
+      return { type: "PLAYLIST_RESPONSE", data } satisfies Message;
+    }
+  },
+);
+
+console.log(LOG_PREFIX, "Service worker started.");