Function retry

src/__tests__/test-utils/loopback.ts:96–102

()

      req.on('error', retry);
    };
    const retry = () => {
      if (Date.now() >= deadline) {
        reject(new Error(`Timed out waiting for ${url}.`));
        return;
      }
      setTimeout(attempt, 25);
    };
    attempt();
  });
}