proxy-agent 6.5.0: proxies

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 proxy-agent.proxies in pkg:npm/proxy-agent@6.5.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/proxy-agent@6.5.0
Demonstrate these symbols/APIs:
  - proxy-agent.proxies
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: esm
  - 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.

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import { proxies, ProxyAgent } from 'proxy-agent';

export async function getAgentConstructor(protocol, isSecure = false) {
  const loaders = proxies[protocol];
  if (!loaders) {
    throw new Error(`Unsupported protocol: ${protocol}`);
  }
  const index = isSecure ? 1 : 0;
  return await loaders[index]();
}

export function getSupportedProtocols() {
  return Object.keys(proxies);
}

export { proxies, ProxyAgent };
export default ProxyAgent;

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{
  "name": "sample-proxy-agent",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "proxy-agent": "6.5.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify proxy-agent.proxies in pkg:npm/proxy-agent@6.5.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/proxy-agent@6.5.0"
  ],
  "symbols": [
    "proxy-agent.proxies"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "esm",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

import assert from 'node:assert/strict';
import { Agent } from 'agent-base';
import { proxies, getAgentConstructor, getSupportedProtocols } from '../index.js';

// 1. proxies exports an object mapping supported proxy protocols to constructor loaders
assert.strictEqual(typeof proxies, 'object', 'proxies must be an object');
assert.ok(proxies !== null, 'proxies must not be null');

// 2. proxies includes loaders for http, https, socks, and pac protocol families
const expectedProtocols = [
  'http',
  'https',
  'socks',
  'socks4',
  'socks4a',
  'socks5',
  'socks5h',
  'pac+data',
  'pac+file',
  'pac+ftp',
  'pac+http',
  'pac+https',
];

const availableProtocols = getSupportedProtocols();
for (const proto of expectedProtocols) {
  assert.ok(
    availableProtocols.includes(proto),
    `proxies must support protocol '${proto}'`
  );
}

// 3. each protocol entry provides a two-element tuple of lazy agent constructor factory functions
for (const [proto, loaders] of Object.entries(proxies)) {
  assert.ok(Array.isArray(loaders), `proxies[${proto}] must be an array`);
  assert.strictEqual(
    loaders.length,
    2,
    `proxies[${proto}] must have length 2 (insecure and secure loaders)`
  );
  assert.strictEqual(
    typeof loaders[0],
    'function',
    `proxies[${proto}][0] must be a function`
  );
  assert.strictEqual(
    typeof loaders[1],
    'function',
    `proxies[${proto}][1] must be a function`
  );
}

// 4. http loaders resolve to HttpProxyAgent and HttpsProxyAgent constructors
const HttpProxyAgentClass = await getAgentConstructor('http', false);
const HttpsProxyAgentClass = await getAgentConstructor('http', true);
assert.strictEqual(typeof HttpProxyAgentClass, 'function');
assert.strictEqual(HttpProxyAgentClass.name, 'HttpProxyAgent');
assert.strictEqual(typeof HttpsProxyAgentClass, 'function');
assert.strictEqual(HttpsProxyAgentClass.name, 'HttpsProxyAgent');

// 5. socks loaders resolve to SocksProxyAgent constructor
const SocksProxyAgentClass = await getAgentConstructor('socks', false);
const SocksProxyAgentSecureClass = await getAgentConstructor('socks', true);
assert.strictEqual(typeof SocksProxyAgentClass, 'function');
assert.strictEqual(SocksProxyAgentClass.name, 'SocksProxyAgent');
assert.strictEqual(SocksProxyAgentClass, SocksProxyAgentSecureClass);

// 6. pac loaders resolve to PacProxyAgent constructor
const PacProxyAgentClass = await getAgentConstructor('pac+data', false);
const PacProxyAgentSecureClass = await getAgentConstructor('pac+data', true);
assert.strictEqual(typeof PacProxyAgentClass, 'function');
assert.strictEqual(PacProxyAgentClass.name, 'PacProxyAgent');
assert.strictEqual(PacProxyAgentClass, PacProxyAgentSecureClass);

// 7. instantiating resolved proxy agent constructors parses target proxy URL correctly
const httpAgent = new HttpProxyAgentClass('http://localhost:8080');
assert.ok(httpAgent instanceof Agent, 'httpAgent must be an instance of Agent');
assert.strictEqual(httpAgent.proxy.host, 'localhost:8080');
assert.strictEqual(httpAgent.proxy.port, '8080');
httpAgent.destroy();

const httpsAgent = new HttpsProxyAgentClass('http://localhost:8443');
assert.ok(httpsAgent instanceof Agent, 'httpsAgent must be an instance of Agent');
assert.strictEqual(httpsAgent.proxy.host, 'localhost:8443');
assert.strictEqual(httpsAgent.proxy.port, '8443');
httpsAgent.destroy();

const socksAgent = new SocksProxyAgentClass('socks5://localhost:1080');
assert.ok(socksAgent instanceof Agent, 'socksAgent must be an instance of Agent');
assert.strictEqual(socksAgent.proxy.host, 'localhost');
assert.strictEqual(socksAgent.proxy.port, 1080);
socksAgent.destroy();

const pacDataUri = 'pac+data:data:application/x-ns-proxy-autoconfig;base64,ZmluZFByb3h5Rm9yVVJMID0gKCkgPT4gJ0RJUkVDVCc7';
const pacAgent = new PacProxyAgentClass(pacDataUri);
assert.ok(pacAgent instanceof Agent, 'pacAgent must be an instance of Agent');
assert.strictEqual(pacAgent.uri.protocol, 'data:');
pacAgent.destroy();

console.log('Contract verification finished successfully.');