typescript exponential backoff

exponential-backoff.ts

const delay = (retryCount: number, delayMultiplier: number) =>
  new Promise((resolve) => setTimeout(resolve, delayMultiplier * retryCount));

export const exponentialBackOff = async <T>(
  callback: () => Promise<T>,
  options: { maxRetries: number; delayMultiplier: number } = {
    maxRetries: 3,
    delayMultiplier: 500,
  },
  retryCount = 0,
  lastError?: unknown
): Promise<T> => {
  if (retryCount > options.maxRetries) throw lastError;
  try {
    return callback();
  } catch (e) {
    await delay(retryCount, options.delayMultiplier);
    return exponentialBackOff(callback, options, retryCount + 1, e);
  }
};