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/** * Simple retry helper with exponential backoff. */ export interface RetryOptions { retries?: number; factor?: number; minTimeout?: number; maxTimeout?: number; retryOn?: (err: any) => boolean; } export async function retry<T>(fn: () => Promise<T>, opts: RetryOptions = {}): Promise<T> { const retries = typeof opts.retries === 'number' ? opts.retries : 3; const factor = opts.factor || 2; const minTimeout = opts.minTimeout || 200; const maxTimeout = opts.maxTimeout || 5000; const retryOn = opts.retryOn || ((err: any) => true); let attempt = 0; let lastError: any = null; while (attempt <= retries) { try { return await fn(); } catch (err) { lastError = err; if (attempt === retries || !retryOn(err)) { break; } const wait = Math.min(maxTimeout, Math.round(minTimeout * Math.pow(factor, attempt))); await new Promise((resolve) => setTimeout(resolve, wait)); attempt += 1; } } throw lastError; }