typescript-retry-decorator

import { Retry, ExponentialBackOffPolicy } from 'typescript-retry-decorator'; // Simulate an external service call that fails a few times let callCount = 0; async function unreliableServiceCall(data: string): Promise<string> { callCount++; if (callCount < 3) { // Fail for the first 2 calls console.log(`Attempt ${callCount}: Service call failed for data: ${data}`); throw new Error('Service temporarily unavailable'); } console.log(`Attempt ${callCount}: Service call succeeded for data: ${data}`); return `Processed: ${data}`; } class MyService { @Retry({ maxAttempts: 5, backOff: 100, // initial backoff 100ms backOffPolicy: ExponentialBackOffPolicy, exponentialOption: { multiplier: 2, maxInterval: 1000 }, // Intervals: 100, 200, 400, 800, 1000, 1000... doRetry: (e: any) => { console.log(`Checking error for retry: ${e.message}`); return e.message === 'Service temporarily unavailable'; }, value: [Error], // Retry on any Error class useOriginalError: true, // Throw original error if max attempts reached useConsoleLogger: true }) async processData(input: string): Promise<string> { console.log(`Executing processData for input: ${input}`); return unreliableServiceCall(input); } } async function runExample() { const service = new MyService(); try { const result = await service.processData('example-data'); console.log(`Final Result: ${result}`); } catch (error: any) { console.error(`Operation failed after retries: ${error.message}`); } finally { callCount = 0; // Reset for potential re-runs } } runExample();