statuses 2.0.1: empty

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.empty 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.empty

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:sha256:16703acc012d4a96e587ee6fda89e28c7bad345a89a7d9dbdeaa2bda219fcae0","contract":["status.empty is an object mapping HTTP status codes with empty bodies to true","status.empty[204] is true for 204 No Content","status.empty[205] is true for 205 Reset Content","status.empty[304] is true for 304 Not Modified","status.empty yields undefined for status codes that carry response bodies (e.g. 200, 404, 500)","isEmptyResponseBody(codeOrMessage) returns true only for status codes or messages with empty bodies","getEmptyStatusCodes() returns the array of numeric status codes that require empty bodies"],"goal":"verify statuses.empty in pkg:npm/statuses@2.0.1","kind":"HOW","packages":["pkg:npm/statuses@2.0.1"],"schemaVersion":1,"symbols":["statuses.empty"]},"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.empty"],"verifierAdapter":"node-typescript@1"}

{
  "name": "verify-statuses-empty",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "verify-statuses-empty",
      "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-empty",
  "version": "1.0.0",
  "type": "module",
  "dependencies": {
    "statuses": "2.0.1"
  }
}

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

import status from 'statuses';

export function isEmptyResponseBody(codeOrMessage) {
  const code = typeof codeOrMessage === 'number' ? codeOrMessage : status(codeOrMessage);
  return Boolean(status.empty[code]);
}

export function getEmptyStatusCodes() {
  return Object.keys(status.empty).map(Number);
}

export default status;

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

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

// 2. Exact empty status codes mapping to true
assert.strictEqual(status.empty[204], true);
assert.strictEqual(status.empty[205], true);
assert.strictEqual(status.empty[304], true);

// 3. Status codes with response bodies map to undefined
assert.strictEqual(status.empty[200], undefined);
assert.strictEqual(status.empty[201], undefined);
assert.strictEqual(status.empty[400], undefined);
assert.strictEqual(status.empty[404], undefined);
assert.strictEqual(status.empty[500], undefined);

// 4. Helper function isEmptyResponseBody with code and message
assert.strictEqual(isEmptyResponseBody(204), true);
assert.strictEqual(isEmptyResponseBody(205), true);
assert.strictEqual(isEmptyResponseBody(304), true);
assert.strictEqual(isEmptyResponseBody('no content'), true);
assert.strictEqual(isEmptyResponseBody('reset content'), true);
assert.strictEqual(isEmptyResponseBody('not modified'), true);

assert.strictEqual(isEmptyResponseBody(200), false);
assert.strictEqual(isEmptyResponseBody('ok'), false);
assert.strictEqual(isEmptyResponseBody(404), false);
assert.strictEqual(isEmptyResponseBody('not found'), false);

// 5. getEmptyStatusCodes returns [204, 205, 304]
const emptyCodes = getEmptyStatusCodes();
assert.deepStrictEqual(emptyCodes.sort((a, b) => a - b), [204, 205, 304]);

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