retry.ts

/** 
 * Adds retries to an async function. 
 */
async function retry<T>(fn: () => Promise<T>, n: number): Promise<T> {
  let lastError: any;
  for (let index = 0; index < n; index++) {
    try {
      return await fn();
    }
    catch (e) {
      lastError = e;
    }
  }
  throw lastError;
}