statuses 2.0.1: retry

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify statuses.retry in pkg:npm/statuses@2.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/statuses@2.0.1
Demonstrate these symbols/APIs:
  - statuses.retry

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:db6c2c874c09b23806cd5275956ea442763effbaa74f3900693aa607da3bf480","contract":["status.retry is an object mapping retryable HTTP status codes to true","status.retry[502] is true indicating 502 Bad Gateway is retryable","status.retry[503] is true indicating 503 Service Unavailable is retryable","status.retry[504] is true indicating 504 Gateway Timeout is retryable","status.retry[code] is undefined for non-retryable status codes (e.g. 200, 400, 404, 500)","isRetryable(codeOrMessage) returns true for retryable HTTP status codes (502, 503, 504) or their names","isRetryable(codeOrMessage) returns false for non-retryable HTTP status codes or their names"],"goal":"verify statuses.retry in pkg:npm/statuses@2.0.1","kind":"HOW","packages":["pkg:npm/statuses@2.0.1"],"schemaVersion":1,"symbols":["statuses.retry"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/statuses@2.0.1"],"schemaVersion":1,"subject":"pkg:npm/statuses@2.0.1","symbols":["statuses.retry"],"verifierAdapter":"node-typescript@1"}

{
  "name": "verify-statuses-retry",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "verify-statuses-retry",
      "version": "1.0.0",
      "dependencies": {
        "statuses": "2.0.1"
      }
    },
    "node_modules/statuses": {
      "version": "2.0.1",
      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.1.tgz",
      "integrity": "sha512-RwNA9Z/7PrK06rYLIzFMlaF+l73iwpzsqRIFgbMLbTcLD6cOao82TaWefPXQvB2fOC4AjuYSEndS7N/mTCbkdQ==",
      "license": "MIT",
      "engines": {
        "node": ">= 0.8"
      }
    }
  }
}

{
  "name": "verify-statuses-retry",
  "version": "1.0.0",
  "type": "module",
  "dependencies": {
    "statuses": "2.0.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify statuses.retry in pkg:npm/statuses@2.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/statuses@2.0.1"
  ],
  "symbols": [
    "statuses.retry"
  ]
}

import status from 'statuses';

/**
 * Check if an HTTP status code or status message is marked retryable.
 *
 * @param {number|string} codeOrMessage
 * @returns {boolean}
 */
export function isRetryable(codeOrMessage) {
  const code = typeof codeOrMessage === 'number' ? codeOrMessage : status(codeOrMessage);
  return Boolean(status.retry[code]);
}

/**
 * Get retryable status codes list.
 *
 * @returns {number[]}
 */
export function getRetryStatusCodes() {
  return Object.keys(status.retry).map(Number);
}

export default status;

import assert from 'node:assert';
import status, { isRetryable, getRetryStatusCodes } from '../src/index.mjs';

// 1. status.retry object structure
assert.strictEqual(typeof status.retry, 'object');
assert.notStrictEqual(status.retry, null);

// 2. Retryable status codes mapping (502, 503, 504)
assert.strictEqual(status.retry[502], true);
assert.strictEqual(status.retry[503], true);
assert.strictEqual(status.retry[504], true);

// 3. String key access for status codes
assert.strictEqual(status.retry['502'], true);
assert.strictEqual(status.retry['503'], true);
assert.strictEqual(status.retry['504'], true);

// 4. Non-retryable status codes return undefined
assert.strictEqual(status.retry[200], undefined);
assert.strictEqual(status.retry[201], undefined);
assert.strictEqual(status.retry[204], undefined);
assert.strictEqual(status.retry[301], undefined);
assert.strictEqual(status.retry[400], undefined);
assert.strictEqual(status.retry[404], undefined);
assert.strictEqual(status.retry[429], undefined);
assert.strictEqual(status.retry[500], undefined);

// 5. Retryable codes collection
const retryCodes = getRetryStatusCodes();
assert.deepStrictEqual(retryCodes.sort(), [502, 503, 504]);

// 6. isRetryable helper with numeric codes
assert.strictEqual(isRetryable(502), true);
assert.strictEqual(isRetryable(503), true);
assert.strictEqual(isRetryable(504), true);
assert.strictEqual(isRetryable(200), false);
assert.strictEqual(isRetryable(404), false);
assert.strictEqual(isRetryable(500), false);

// 7. isRetryable helper with status messages
assert.strictEqual(isRetryable('Bad Gateway'), true);
assert.strictEqual(isRetryable('Service Unavailable'), true);
assert.strictEqual(isRetryable('Gateway Timeout'), true);
assert.strictEqual(isRetryable('OK'), false);
assert.strictEqual(isRetryable('Internal Server Error'), false);

// 8. Invalid status throws error in helper lookup
assert.throws(() => isRetryable('Invalid Status'), /invalid status message/);

console.log('Contract test passed.');