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// Retry with exponential back-off async function withRetry(fn, retries = 3, delay = 500) { try { return await fn(); } catch (e) { if (retries === 0) throw e; await new Promise(r => setTimeout(r, delay)); return withRetry(fn, retries - 1, delay * 2); } } // Memoize async const memo = new Map(); const cachedFetch = url => memo.get(url) ?? memo.set(url, fetch(url).then(r => r.json())).get(url);
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