@types/node 22.20.1: dependencies

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 @types/node.dependencies in pkg:npm/%40types/node@22.20.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40types/node@22.20.1
Demonstrate these symbols/APIs:
  - @types/node.dependencies

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:sha256:82e81d071889ce8f5e03bd745d72ef45b658075efad8dbef965a0b214681b293","contract":["@types/node package.json declares undici-types at version ~6.21.0 in dependencies","undici-types package.json declares package name as undici-types, version as 6.21.0, and types as index.d.ts","@types/node http.d.ts defines WebSocket, CloseEvent, and MessageEvent via undici-types import","@types/node worker_threads.d.ts imports MessageEvent from undici-types","undici-types index.d.ts re-exports declarations from websocket module","undici-types websocket.d.ts declares WebSocket, CloseEvent, and MessageEvent"],"goal":"verify @types/node.dependencies in pkg:npm/%40types/node@22.20.1","kind":"HOW","packages":["pkg:npm/%40types/node@22.20.1"],"schemaVersion":1,"symbols":["@types/node.dependencies"]},"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/%40types/node@22.20.1"],"schemaVersion":1,"subject":"pkg:npm/%40types/node@22.20.1","symbols":["@types/node.dependencies"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-types-node-dependencies",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-types-node-dependencies",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "@types/node": "22.20.1"
      }
    },
    "node_modules/@types/node": {
      "version": "22.20.1",
      "resolved": "https://registry.npmjs.org/@types/node/-/node-22.20.1.tgz",
      "integrity": "sha512-EANqOCF9QFyra+4pfxUcX9STKJpCLjMbObVzljIJomAWSnuSIEAvyzEU53GaajbXJEgdh0iEcPL+DGvpUd4k1Q==",
      "license": "MIT",
      "dependencies": {
        "undici-types": "~6.21.0"
      }
    },
    "node_modules/undici-types": {
      "version": "6.21.0",
      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
      "integrity": "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ==",
      "license": "MIT"
    }
  }
}

{
  "name": "sample-types-node-dependencies",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "dependencies": {
    "@types/node": "22.20.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify @types/node.dependencies in pkg:npm/%40types/node@22.20.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40types/node@22.20.1"
  ],
  "symbols": [
    "@types/node.dependencies"
  ]
}

import assert from 'node:assert/strict';
import fs from 'node:fs';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);

// 1. @types/node package.json declares undici-types at version ~6.21.0 in dependencies
const nodePkgJson = require('@types/node/package.json');
assert.ok(nodePkgJson.dependencies, 'package.json should have dependencies');
assert.equal(nodePkgJson.dependencies['undici-types'], '~6.21.0');

// 2. undici-types package.json declares package name as undici-types, version as 6.21.0, and types as index.d.ts
const undiciPkgJson = require('undici-types/package.json');
assert.equal(undiciPkgJson.name, 'undici-types');
assert.equal(undiciPkgJson.version, '6.21.0');
assert.equal(undiciPkgJson.types, 'index.d.ts');

// 3. @types/node http.d.ts defines WebSocket, CloseEvent, and MessageEvent via undici-types import
const httpDtsPath = require.resolve('@types/node/http.d.ts');
assert.ok(fs.existsSync(httpDtsPath));
const httpDtsContent = fs.readFileSync(httpDtsPath, 'utf8');
assert.ok(httpDtsContent.includes('const WebSocket: typeof import("undici-types").WebSocket;'));
assert.ok(httpDtsContent.includes('const CloseEvent: typeof import("undici-types").CloseEvent;'));
assert.ok(httpDtsContent.includes('const MessageEvent: typeof import("undici-types").MessageEvent;'));

// 4. @types/node worker_threads.d.ts imports MessageEvent from undici-types
const workerDtsPath = require.resolve('@types/node/worker_threads.d.ts');
assert.ok(fs.existsSync(workerDtsPath));
const workerDtsContent = fs.readFileSync(workerDtsPath, 'utf8');
assert.ok(workerDtsContent.includes('import { MessageEvent } from "undici-types";'));

// 5. undici-types index.d.ts re-exports declarations from websocket module
const undiciIndexPath = require.resolve('undici-types/index.d.ts');
assert.ok(fs.existsSync(undiciIndexPath));
const undiciIndexContent = fs.readFileSync(undiciIndexPath, 'utf8');
assert.ok(undiciIndexContent.includes("export * from './websocket'"));

// 6. undici-types websocket.d.ts declares WebSocket, CloseEvent, and MessageEvent
const undiciWsDtsPath = require.resolve('undici-types/websocket.d.ts');
assert.ok(fs.existsSync(undiciWsDtsPath));
const undiciWsDtsContent = fs.readFileSync(undiciWsDtsPath, 'utf8');
assert.ok(undiciWsDtsContent.includes('interface WebSocket extends EventTarget {'));
assert.ok(undiciWsDtsContent.includes('export declare const WebSocket: {'));
assert.ok(undiciWsDtsContent.includes('interface CloseEvent extends Event {'));
assert.ok(undiciWsDtsContent.includes('export declare const CloseEvent: {'));
assert.ok(undiciWsDtsContent.includes('interface MessageEvent<T = any> extends Event {'));
assert.ok(undiciWsDtsContent.includes('export declare const MessageEvent: {'));

console.log('All contract tests passed.');