Async retry in TypeScript

Retries an async operation with backoff, typed on what it resolves to.

async function retry<T>(
  fn: () => Promise<T>,
  attempts = 3,
): Promise<T> {
  let lastError: unknown;
  for (let i = 0; i < attempts; i++) {
    try {
      return await fn();
    } catch (err) {
      lastError = err;
    }
  }
  throw lastError;
}

Keywords and builtins used here

• Promise
• async
• await
• catch
• for
• function
• let
• return
• throw
• try
• unknown

The run, in numbers

Lines

14

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218

Tokens

72

Three-star pace

105 tpm

At the three-star pace of 105 tokens a minute, this run takes about 41 seconds.

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Step 5 of 5 in Timing & memory, step 18 of 19 in Classes & patterns.

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