retry async operation up to N times

retry.ts

/**
 * retry async operaration up to N times
 *
 * usage:
 * ```ts
 * async fn() {
 *  const response = await retry(() => fetch('/endpoint/that/might/fail'), 3)
 * }
 * fn() // will retry fetch up to 3 times
 * ```
 * @param fn (async) function to retry
 * @param maxTries 
 */
async function retry<T>(fn: () => Promise<T>, maxTries = 1):Promise<T> {
  let tries=0;
  while (true) {
    tries++;
    try {
      return await fn();
    } catch (e) {
      if (tries >= maxTries) {
        throw e;
      }
    }
  }
}