如何向此JavaScript函数添加超时参数？

function withTimeout(fn, timeout) {
  return new Promise((resolve, reject) => {
    const timer = setTimeout(() => {
      reject(new Error('Timeout'));
    }, timeout);

    fn()
      .then((result) => {
        clearTimeout(timer);
        resolve(result);
      })
      .catch((error) => {
        clearTimeout(timer);
        reject(error);
      });
  });
}

function fetchData() {
  return new Promise((resolve) => {
    setTimeout(() => {
      resolve('Data fetched successfully');
    }, 2000);
  });
}

const timeout = 1500;

withTimeout(fetchData, timeout)
  .then((result) => {
    console.log(result);
  })
  .catch((error) => {
    console.error(error);
  });