Telegram: harden network retries and config

Co-authored-by: techboss <techboss@users.noreply.github.com>

src/telegram/network-errors.test.ts

@@ -0,0 +1,31 @@
+import { describe, expect, it } from "vitest";
+
+import { isRecoverableTelegramNetworkError } from "./network-errors.js";
+
+describe("isRecoverableTelegramNetworkError", () => {
+  it("detects recoverable error codes", () => {
+    const err = Object.assign(new Error("timeout"), { code: "ETIMEDOUT" });
+    expect(isRecoverableTelegramNetworkError(err)).toBe(true);
+  });
+
+  it("detects AbortError names", () => {
+    const err = Object.assign(new Error("The operation was aborted"), { name: "AbortError" });
+    expect(isRecoverableTelegramNetworkError(err)).toBe(true);
+  });
+
+  it("detects nested causes", () => {
+    const cause = Object.assign(new Error("socket hang up"), { code: "ECONNRESET" });
+    const err = Object.assign(new TypeError("fetch failed"), { cause });
+    expect(isRecoverableTelegramNetworkError(err)).toBe(true);
+  });
+
+  it("skips message matches for send context", () => {
+    const err = new TypeError("fetch failed");
+    expect(isRecoverableTelegramNetworkError(err, { context: "send" })).toBe(false);
+    expect(isRecoverableTelegramNetworkError(err, { context: "polling" })).toBe(true);
+  });
+
+  it("returns false for unrelated errors", () => {
+    expect(isRecoverableTelegramNetworkError(new Error("invalid token"))).toBe(false);
+  });
+});