Function poll

Example/testHotUpdate/e2e/globalSetup.js:68–81

()

  return new Promise((resolve, reject) => {
    const poll = () => {
      const req = http.get(url, res => {
        if (res.statusCode === 200) {
          resolve(void 0);
          return;
        }
        retry();
      });
      req.on('error', retry);
      req.setTimeout(1000, () => {
        req.destroy();
        retry();
      });
    };

    const retry = () => {
      if (Date.now() - start > timeoutMs) {