fix: normalize abort signals for telegram fetch

src/infra/fetch.test.ts

@@ -0,0 +1,36 @@
+import { describe, expect, it, vi } from "vitest";
+
+import { wrapFetchWithAbortSignal } from "./fetch.js";
+
+describe("wrapFetchWithAbortSignal", () => {
+  it("converts foreign abort signals to native controllers", async () => {
+    let seenSignal: AbortSignal | undefined;
+    const fetchImpl = vi.fn(async (_input: RequestInfo | URL, init?: RequestInit) => {
+      seenSignal = init?.signal as AbortSignal | undefined;
+      return {} as Response;
+    });
+
+    const wrapped = wrapFetchWithAbortSignal(fetchImpl);
+
+    let abortHandler: (() => void) | null = null;
+    const fakeSignal = {
+      aborted: false,
+      addEventListener: (event: string, handler: () => void) => {
+        if (event === "abort") abortHandler = handler;
+      },
+      removeEventListener: (event: string, handler: () => void) => {
+        if (event === "abort" && abortHandler === handler) abortHandler = null;
+      },
+    } as AbortSignal;
+
+    const promise = wrapped("https://example.com", { signal: fakeSignal });
+    expect(fetchImpl).toHaveBeenCalledOnce();
+    expect(seenSignal).toBeInstanceOf(AbortSignal);
+    expect(seenSignal).not.toBe(fakeSignal);
+
+    abortHandler?.();
+    expect(seenSignal?.aborted).toBe(true);
+
+    await promise;
+  });
+});