Create memoized fetch credentials

createMemoizedFetchCredentials.js

const TOKEN_EXPIRE_AFTER = 300000;

// This function will create a memoized fetchCredentials function and reduce the call to the function.
// The memoized result is time-sensitive and will be invalidated after 5 minutes (specified in TOKEN_EXPIRE_AFTER).
const createMemoizedFetchCredentials = () => {
  let lastFetch = 0;
  let lastPromise;

  return () => {
    const now = Date.now();

    if (!lastPromise || now - lastFetch > TOKEN_EXPIRE_AFTER) {
      lastFetch = now;
      lastPromise = fetchCredentials().catch(error => {
        lastPromise = null;

        return Promise.reject(error);
      });
    }

    return lastPromise;
  };
};