An implementation of the fetch api with a timeout option

fetch-with-timeout.js

function fetchWithTimeout(url, options, timeout, onTimeout) {
  const timer = new Promise((resolve) => {
    setTimeout(resolve, timeout, {
      timeout: true,
    });
  });
  return Promise.race([fetch(url, options), timer])
    .then((response) => {
      if (response.timeout) {
        onTimeout();
      }
      return response;
    });
}