Function withTimeout

packages/deno/test/deno-http.test.ts:58–67

(p: Promise<T>, ms: number, what: string)

// Bind a promise so a real "never arrives" bug fails the test.
function withTimeout<T>(p: Promise<T>, ms: number, what: string): Promise<T> {
  let timer: ReturnType<typeof setTimeout> | undefined;
  const timeout = new Promise<T>((_, reject) => {
    timer = setTimeout(() => reject(new Error(`Timed out waiting for ${what} after ${ms}ms`)), ms);
  });
  // Clear the timer on either resolution so Deno's leak detector is happy.
  return Promise.race([p, timeout]).finally(() => {
    if (timer !== undefined) clearTimeout(timer);
  });
}

// Activation gate — split into two skip-mirrored tests so each run exercises
// exactly one assertion. CI on a supported Deno verifies inclusion; CI on an