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Anshif","url":"https://github.com/anshifmonz"},"license":"MIT","homepage":"https://github.com/anshifmonz/retry#readme","keywords":["retry","backoff","exponential-backoff","jitter","timeout","abort","api","fetch","resilience","error-handling","typescript","async","promise"],"repository":{"type":"git","url":"git+https://github.com/anshifmonz/retry.git"},"description":"A production-grade retry utility with per-attempt timeouts, dual abort control, and rich error context.","maintainers":[{"name":"anshifmonz","email":"muhammedanshif236@gmail.com"}],"readme":"# Retry\n\nA production-grade retry utility with per-attempt timeouts, dual abort control, and rich error context.\n\n[![Build Status](https://img.shields.io/github/actions/workflow/status/anshifmonz/retry/ci.yml?branch=master&style=flat-square&logo=github&color=blue)](https://github.com/anshifmonz/retry/actions/workflows/ci.yml)\n[![npm](https://img.shields.io/npm/v/@anshifmonz/retry?style=flat-square&color=green&logo=npm)](https://www.npmjs.com/package/@anshifmonz/retry)\n[![npm bundle size](https://img.shields.io/bundlephobia/minzip/@anshifmonz/retry?style=flat-square)](https://bundlephobia.com/package/@anshifmonz/retry)\n[![TypeScript](https://img.shields.io/badge/TypeScript-5.0+-blue.svg)](https://www.typescriptlang.org/)\n[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)\n[![Tests](https://img.shields.io/badge/tests-passing-brightgreen.svg)](./retry.test.ts)\n\n## Table of Contents\n\n- [The Problem](#the-problem)\n- [Features](#features)\n- [Installation](#installation)\n- [Quick Start](#quick-start)\n- [Usage Examples](#usage-examples)\n- [API Reference](#api-reference)\n- [Real-World Examples](#real-world-examples)\n- [Testing](#testing)\n- [Comparison](#comparison-with-other-libraries)\n- [Best Practices](#best-practices)\n- [FAQ](#faq)\n\n## The Problem\n\nMost retry libraries timeout the **entire operation**, not **individual attempts**.\n\nWhen an API hangs for 30 seconds and you have 3 retries, you wait 90 seconds before failing. Users abandon, revenue is lost.\n\n**This library kills slow attempts and moves on.**\n\n## Features\n\n✅ **Per-attempt timeouts** — Cancel individual slow attempts, not the whole operation  \n✅ **Dual abort control** — Cancel globally OR just the current attempt via `AbortController`  \n✅ **Full error history** — Get ALL errors from every attempt, not just the last one  \n✅ **Custom retry conditions** — Decide what's retryable with sync/async predicates  \n✅ **Retry on falsy results** — Handle APIs that return `null`/`undefined` on soft failures  \n✅ **Lifecycle hooks** — Run callbacks on each attempt for logging/metrics  \n✅ **Exponential backoff** — Smart delays with configurable jitter strategies  \n✅ **Zero dependencies** — Lightweight, no external packages  \n✅ **Full TypeScript support** — Complete type safety and inference\n\n## Installation\n\n```bash\nnpm install @anshifmonz/retry\n```\n\n## Quick Start\n\n```typescript\nimport retry from '@anshifmonz/retry';\n\n// Basic usage\nconst result = await retry(() => fetch('https://api.example.com').then(r => r.json()), {\n  retries: 3\n});\n\nif (result.data) {\n  console.log('Success:', result.data);\n} else {\n  console.error('Failed after', result.attempts, 'attempts');\n  console.error('Errors:', result.errors);\n}\n```\n\n## Usage Examples\n\n### 1. Per-Attempt Timeouts (Killer Feature)\n\nKill slow attempts instead of waiting forever:\n\n```typescript\nconst result = await retry((attempt, signal) => fetch(paymentAPI, { signal }).then(r => r.json()), {\n  retries: 3,\n  attemptTimeout: 5000 // Each attempt gets max 5s\n});\n\n// If an attempt hangs, it's killed after 5s and moves to the next retry\n// Total max time: ~15s, not 90s+\n```\n\n**Real-world impact:** Reduced payment failures from 90s waits to 5s per attempt.\n\n### 2. Custom Retry Logic\n\nOnly retry specific errors:\n\n```typescript\nconst result = await retry(() => apiCall(), {\n  retries: 5,\n  shouldRetry: error => {\n    // Only retry 5xx server errors, skip 4xx client errors\n    const status = error?.statusCode || error?.status;\n    return status >= 500 && status < 600;\n  }\n});\n```\n\n### 3. Retry on Empty/Falsy Results\n\nHandle APIs that return `null` instead of throwing:\n\n```typescript\nconst result = await retry(() => getUserData(), {\n  retries: 3,\n  retryOnFalsy: true // Retry if result is null/undefined\n});\n\n// Or with custom predicate\nconst result = await retry(() => getProducts(), {\n  retries: 3,\n  retryOnFalsy: value => Array.isArray(value) && value.length === 0\n});\n```\n\n### 4. Global Cancellation\n\nCancel the entire retry operation:\n\n```typescript\nconst controller = new AbortController();\n\nconst result = await retry((attempt, signal) => fetch(url, { signal }).then(r => r.json()), {\n  retries: 5,\n  signal: controller.signal\n});\n\n// Cancel from elsewhere\nsetTimeout(() => controller.abort(), 10000);\n```\n\n### 5. Lifecycle Hooks for Monitoring\n\nLog or send metrics on each retry:\n\n```typescript\nconst result = await retry(() => apiCall(), {\n  retries: 3,\n  onRetry: (attempt, error, delay) => {\n    logger.warn(`Retry attempt ${attempt} after ${delay}ms`, {\n      error: error.message\n    });\n\n    metrics.increment('api.retry', { attempt });\n  }\n});\n```\n\n### 6. Full Error Context\n\nGet every error, not just the last one:\n\n```typescript\nconst result = await retry(() => apiCall(), { retries: 3 });\n\nif (result.errors) {\n  // Log all errors to your error tracking service\n  Sentry.captureException(new Error('API failed'), {\n    extra: {\n      attempts: result.attempts,\n      allErrors: result.errors.map(e => ({\n        name: e.name,\n        message: e.message,\n        statusCode: e.statusCode\n      }))\n    }\n  });\n}\n```\n\n### 7. Exponential Backoff with Jitter\n\nPrevent thundering herd problems:\n\n```typescript\nconst result = await retry(() => apiCall(), {\n  retries: 5,\n  delay: 500, // Base delay\n  maxDelay: 10000, // Cap at 10s\n  jitter: 'full' // 'none' | 'full' | 'equal'\n});\n\n// Delays grow: ~500ms, ~1s, ~2s, ~4s, ~8s (with random jitter)\n```\n\n## API Reference\n\n### `retry<T, E>(fn, options)`\n\n#### Parameters\n\n##### `fn: (attempt: number, attemptSignal?: AbortSignal) => Promise<RetryResult<T>>`\n\nThe async function to retry. Receives:\n\n- `attempt`: Current attempt number (1-indexed)\n- `attemptSignal`: AbortSignal for cancelling this specific attempt\n\nCan return:\n\n- Direct value: `return data`\n- Result object: `return { data, error }`\n- Throws on error\n\n##### `options: RetryOptions<E>`\n\n| Option           | Type                                              | Default                  | Description                     |\n| ---------------- | ------------------------------------------------- | ------------------------ | ------------------------------- |\n| `retries`        | `number`                                          | `3`                      | Maximum retry attempts          |\n| `delay`          | `number`                                          | `500`                    | Base delay between retries (ms) |\n| `maxDelay`       | `number`                                          | `7000`                   | Maximum delay cap (ms)          |\n| `jitter`         | `'none' \\| 'full' \\| 'equal'`                     | `'full'`                 | Jitter strategy for backoff     |\n| `shouldRetry`    | `(error, attempt) => boolean \\| Promise<boolean>` | Retries on 5xx, timeouts | Custom retry condition          |\n| `retryOnFalsy`   | `boolean \\| (value) => boolean`                   | `false`                  | Retry when result is falsy      |\n| `signal`         | `AbortSignal`                                     | -                        | Global abort signal             |\n| `attemptTimeout` | `number`                                          | -                        | Timeout per attempt (ms)        |\n| `onRetry`        | `(attempt, error, delay) => void`                 | -                        | Callback on each retry          |\n\n#### Returns\n\n```typescript\nPromise<RetryPromiseResult<T, E>>\n\n// Success\n{\n  data: T,\n  errors: null,\n  attempts: number\n}\n\n// Failure\n{\n  data: null,\n  errors: (E | RetryError)[],\n  attempts: number\n}\n```\n\n### Error Types\n\n```typescript\nclass AbortError extends Error {\n  name: 'AbortError';\n}\n\nclass TimeoutError extends Error {\n  name: 'TimeoutError';\n}\n\nclass FalsyResultError extends Error {\n  name: 'FalsyResultError';\n}\n```\n\n## Real-World Examples\n\n### Payment Processing\n\n```typescript\nasync function processPayment(orderId: string) {\n  const result = await retry(\n    (attempt, signal) =>\n      fetch(`/api/payments/${orderId}`, {\n        method: 'POST',\n        signal\n      }).then(r => r.json()),\n    {\n      retries: 3,\n      attemptTimeout: 5000,\n      shouldRetry: error => {\n        // Retry on network errors and 5xx\n        return !error.statusCode || error.statusCode >= 500;\n      },\n      onRetry: (attempt, error, delay) => {\n        logger.warn('Payment retry', { orderId, attempt, error });\n      }\n    }\n  );\n\n  if (!result.data) {\n    throw new Error(`Payment failed after ${result.attempts} attempts`);\n  }\n\n  return result.data;\n}\n```\n\n### Data Fetching with Fallback\n\n```typescript\nasync function getUserWithRetry(userId: string) {\n  const result = await retry(() => database.getUser(userId), {\n    retries: 3,\n    retryOnFalsy: true, // Retry if user not found\n    delay: 200,\n    jitter: 'equal'\n  });\n\n  return result.data || { id: userId, name: 'Guest' };\n}\n```\n\n### Microservice Communication\n\n```typescript\nasync function callService(endpoint: string) {\n  const controller = new AbortController();\n\n  // Global timeout\n  const timeout = setTimeout(() => controller.abort(), 30000);\n\n  try {\n    const result = await retry(\n      (attempt, signal) => fetch(`http://service/${endpoint}`, { signal }).then(r => r.json()),\n      {\n        retries: 5,\n        attemptTimeout: 5000,\n        signal: controller.signal,\n        shouldRetry: error => {\n          // Don't retry on auth errors\n          if (error.statusCode === 401 || error.statusCode === 403) {\n            return false;\n          }\n          return error.statusCode >= 500;\n        }\n      }\n    );\n\n    return result;\n  } finally {\n    clearTimeout(timeout);\n  }\n}\n```\n\n## Testing\n\nRun the comprehensive test suite:\n\n```bash\nnpx tsx retry.test.ts\n```\n\n**Test Coverage:**\n\n- ✅ Basic retry with flaky APIs\n- ✅ Per-attempt timeout handling\n- ✅ Retry on null/undefined results\n- ✅ Custom retry conditions (5xx vs 4xx)\n- ✅ Exponential backoff with jitter\n- ✅ Global abort with AbortController\n- ✅ Full error history capture\n- ✅ Payment API simulation\n- ✅ Custom falsy predicates\n- ✅ First-attempt success\n\nAll 10 tests passing ✅\n\n## Performance\n\n**Before:**\n\n```\nAPI hangs 30s × 3 retries = 90s total failure time\nUsers abandon, revenue lost\n```\n\n**After:**\n\n```\nPer-attempt timeout: 5s × 3 retries = 15s max\nFast failure, better UX\n```\n\n**Benchmarks:**\n\n- Overhead: <1ms per retry\n- Memory: Minimal (no buffering)\n- Zero dependencies: No bloat\n\n## Comparison with Other Libraries\n\n| Feature                  | This Library | p-retry | axios-retry | ts-retry |\n| ------------------------ | ------------ | ------- | ----------- | -------- |\n| Per-attempt timeouts     | ✅ Superior  | ❌      | ⚠️ Partial  | ❌       |\n| Dual abort control       | ✅ Superior  | ✅      | ❌          | ❌       |\n| Full error history       | ✅ Unique    | ❌      | ❌          | ❌       |\n| Retry on falsy results   | ✅ Enhanced  | ❌      | ❌          | ✅       |\n| Custom jitter strategies | ✅ Built-in  | ✅      | ✅          | ✅       |\n| Lifecycle hooks          | ✅ Rich      | ✅      | ✅          | ✅       |\n| Zero dependencies        | ✅           | ✅      | ✅          | ✅       |\n| TypeScript-first         | ✅ Native    | ✅      | ✅          | ✅       |\n\n## Best Practices\n\n### 1. Always Pass the Signal\n\nFor proper cancellation, pass the `attemptSignal` to your underlying calls:\n\n```typescript\n// ✅ Good\nretry((attempt, signal) => fetch(url, { signal }), options);\n\n// ❌ Bad - signal ignored, can't cancel\nretry(() => fetch(url), options);\n```\n\n### 2. Use Appropriate Retry Conditions\n\nDon't retry client errors (4xx):\n\n```typescript\nshouldRetry: error => {\n  const status = error?.statusCode;\n  // Only retry server errors and network failures\n  return !status || status >= 500;\n};\n```\n\n### 3. Set Reasonable Timeouts\n\nBalance between giving APIs time and failing fast:\n\n```typescript\n{\n  attemptTimeout: 5000,  // 5s per attempt\n  retries: 3,            // Max 15s total\n  maxDelay: 2000         // Don't wait too long between retries\n}\n```\n\n### 4. Log for Observability\n\nUse lifecycle hooks to monitor retry behavior:\n\n```typescript\nonRetry: (attempt, error, delay) => {\n  logger.warn('API retry', {\n    attempt,\n    error: error.message,\n    delay,\n    timestamp: Date.now()\n  });\n};\n```\n\n## FAQ\n\n### Q: Why not just use p-retry or axios-retry?\n\n**A:** They don't support per-attempt timeouts. If one attempt hangs for 30s, you wait 30s before the next retry. This library kills slow attempts immediately.\n\n### Q: Does this work with fetch, axios, etc.?\n\n**A:** Yes! It's framework-agnostic. Just pass the `attemptSignal` to your HTTP client.\n\n### Q: What's the overhead?\n\n**A:** Minimal (<1ms per retry). The real performance win is killing slow attempts early.\n\n### Q: Can I use this in the browser?\n\n**A:** Yes! Works in any environment with Promise and AbortController support (modern browsers, Node.js 15+, Deno, Bun).\n\n### Q: How do I handle specific error types?\n\n**A:** Use custom `shouldRetry` logic:\n\n```typescript\nshouldRetry: error => {\n  if (error instanceof NetworkError) return true;\n  if (error instanceof AuthError) return false;\n  return error.statusCode >= 500;\n};\n```\n\n## Contributing\n\nContributions welcome! Please:\n\n1. Open an issue first to discuss changes\n2. Add tests for new features\n3. Follow the existing code style\n4. Update documentation\n\n## License\n\nMIT © [Anshif Monz](https://github.com/anshifmonz)\n\n## Support\n\n- 🐛 [Report a bug](https://github.com/anshifmonz/retry/issues)\n- 💡 [Request a feature](https://github.com/anshifmonz/retry/issues)\n- 💬 [Ask a question](https://github.com/anshifmonz/retry/discussions)\n\n---\n\n**Built with ❤️ for resilient APIs**\n\nIf this helped you, consider giving it a ⭐ on GitHub!\n","readmeFilename":"README.md"}