undici-types 6.21.0

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 pkg:npm/undici-types@6.21.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/undici-types@6.21.0
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:sha256:5ed3b4c413573333bbd9e39b61c8daae0204abf84e56bc3c9c4e6d00602b55b0","constraints":{"executionContext":"node"},"contract":["package manifest specifies index.d.ts type declarations and files field","declares Dispatcher base class with dispatch, request, stream, pipeline, connect, and compose methods","declares Client, Pool, BalancedPool, and Agent classes extending Dispatcher","declares high-level request, stream, pipeline, connect, and upgrade API functions","declares fetch, Headers, Request, Response, FormData, File, and FileReader web standards declarations","declares Errors namespace with UndiciError base class and specific error subtypes"],"goal":"verify pkg:npm/undici-types@6.21.0","kind":"HOW","packages":["pkg:npm/undici-types@6.21.0"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/undici-types@6.21.0"],"schemaVersion":1,"subject":"pkg:npm/undici-types@6.21.0","verifierAdapter":"node-typescript@1"}

{
  "name": "sample-undici-types",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-undici-types",
      "version": "1.0.0",
      "license": "MIT-0",
      "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-undici-types",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "undici-types": "6.21.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/undici-types@6.21.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/undici-types@6.21.0"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

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

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

// 1. Resolve undici-types package manifest and verify type declaration entry points
const pkgPath = require.resolve('undici-types/package.json');
const pkg = JSON.parse(fs.readFileSync(pkgPath, 'utf8'));

assert.equal(pkg.name, 'undici-types', 'Package name must be undici-types');
assert.equal(pkg.version, '6.21.0', 'Package version must be 6.21.0');
assert.equal(pkg.types, 'index.d.ts', 'Package types entry must point to index.d.ts');
assert.ok(Array.isArray(pkg.files) && pkg.files.includes('*.d.ts'), 'Package files must include *.d.ts');

const typesDir = path.dirname(pkgPath);
const indexDts = fs.readFileSync(path.join(typesDir, 'index.d.ts'), 'utf8');
const dispatcherDts = fs.readFileSync(path.join(typesDir, 'dispatcher.d.ts'), 'utf8');
const clientDts = fs.readFileSync(path.join(typesDir, 'client.d.ts'), 'utf8');
const poolDts = fs.readFileSync(path.join(typesDir, 'pool.d.ts'), 'utf8');
const agentDts = fs.readFileSync(path.join(typesDir, 'agent.d.ts'), 'utf8');
const apiDts = fs.readFileSync(path.join(typesDir, 'api.d.ts'), 'utf8');
const fetchDts = fs.readFileSync(path.join(typesDir, 'fetch.d.ts'), 'utf8');
const errorsDts = fs.readFileSync(path.join(typesDir, 'errors.d.ts'), 'utf8');

// 2. Verify Dispatcher base class declaration and methods
assert.ok(
  dispatcherDts.includes('declare class Dispatcher extends EventEmitter'),
  'Dispatcher class must extend EventEmitter'
);
assert.ok(
  dispatcherDts.includes('dispatch(options: Dispatcher.DispatchOptions, handler: Dispatcher.DispatchHandlers): boolean;') &&
  dispatcherDts.includes('request(options: Dispatcher.RequestOptions): Promise<Dispatcher.ResponseData>;') &&
  dispatcherDts.includes('stream(options: Dispatcher.RequestOptions, factory: Dispatcher.StreamFactory): Promise<Dispatcher.StreamData>;') &&
  dispatcherDts.includes('pipeline(options: Dispatcher.PipelineOptions, handler: Dispatcher.PipelineHandler): Duplex;') &&
  dispatcherDts.includes('connect(options: Dispatcher.ConnectOptions): Promise<Dispatcher.ConnectData>;') &&
  dispatcherDts.includes('compose(dispatchers: Dispatcher.DispatcherComposeInterceptor[]): Dispatcher.ComposedDispatcher;'),
  'Dispatcher must declare dispatch, request, stream, pipeline, connect, and compose methods'
);

// 3. Verify Client, Pool, BalancedPool, and Agent classes extending Dispatcher
assert.ok(
  clientDts.includes('export class Client extends Dispatcher') &&
  clientDts.includes('constructor(url: string | URL, options?: Client.Options);'),
  'Client class must extend Dispatcher'
);
assert.ok(
  poolDts.includes('declare class Pool extends Dispatcher') &&
  poolDts.includes('constructor(url: string | URL, options?: Pool.Options)'),
  'Pool class must extend Dispatcher'
);
assert.ok(
  agentDts.includes('declare class Agent extends Dispatcher') &&
  agentDts.includes('constructor(opts?: Agent.Options)'),
  'Agent class must extend Dispatcher'
);
assert.ok(
  indexDts.includes('export { Dispatcher, BalancedPool, Pool, Client, buildConnector, errors, Agent'),
  'index.d.ts must export Dispatcher, BalancedPool, Pool, Client, buildConnector, errors, and Agent'
);

// 4. Verify high-level request, stream, pipeline, connect, and upgrade API functions
assert.ok(
  apiDts.includes('declare function request(') &&
  apiDts.includes('declare function stream(') &&
  apiDts.includes('declare function pipeline(') &&
  apiDts.includes('declare function connect(') &&
  apiDts.includes('declare function upgrade('),
  'api.d.ts must declare request, stream, pipeline, connect, and upgrade functions'
);

// 5. Verify fetch, Headers, Request, Response, FormData, File, and FileReader web standards declarations
assert.ok(
  fetchDts.includes('export declare function fetch (') &&
  fetchDts.includes('export type RequestInfo = string | URL | Request') &&
  fetchDts.includes('export class BodyMixin'),
  'fetch.d.ts must declare fetch function, RequestInfo, and BodyMixin'
);
assert.ok(
  indexDts.includes("export * from './fetch'") &&
  indexDts.includes("export * from './formdata'") &&
  indexDts.includes("export * from './file'") &&
  indexDts.includes("export * from './filereader'"),
  'index.d.ts must re-export fetch, formdata, file, and filereader types'
);

// 6. Verify Errors namespace with UndiciError and error subtypes
assert.ok(
  errorsDts.includes('export class UndiciError extends Error') &&
  errorsDts.includes('export class ConnectTimeoutError extends UndiciError') &&
  errorsDts.includes('export class HeadersTimeoutError extends UndiciError') &&
  errorsDts.includes('export class BodyTimeoutError extends UndiciError') &&
  errorsDts.includes('export class ResponseStatusCodeError extends UndiciError'),
  'errors.d.ts must declare UndiciError and specific error subtypes'
);

console.log('Contract tests passed successfully.');