Add Bun bundle docs and Telegram grammY support

src/telegram/download.test.ts

@@ -0,0 +1,37 @@
+import { describe, expect, it, vi } from "vitest";
+
+import {
+  downloadTelegramFile,
+  getTelegramFile,
+  type TelegramFileInfo,
+} from "./download.js";
+
+describe("telegram download", () => {
+  it("fetches file info", async () => {
+    const json = vi.fn().mockResolvedValue({ ok: true, result: { file_path: "photos/1.jpg" } });
+    vi.spyOn(global, "fetch" as never).mockResolvedValueOnce({
+      ok: true,
+      status: 200,
+      statusText: "OK",
+      json,
+    } as Response);
+    const info = await getTelegramFile("tok", "fid");
+    expect(info.file_path).toBe("photos/1.jpg");
+  });
+
+  it("downloads and saves", async () => {
+    const info: TelegramFileInfo = { file_id: "fid", file_path: "photos/1.jpg" };
+    const arrayBuffer = async () => new Uint8Array([1, 2, 3, 4]).buffer;
+    vi.spyOn(global, "fetch" as never).mockResolvedValueOnce({
+      ok: true,
+      status: 200,
+      statusText: "OK",
+      body: true,
+      arrayBuffer,
+      headers: { get: () => "image/jpeg" },
+    } as Response);
+    const saved = await downloadTelegramFile("tok", info, 1024 * 1024);
+    expect(saved.path).toBeTruthy();
+    expect(saved.contentType).toBe("image/jpeg");
+  });
+});