CodeSampleX

Sample

proxy-agent 6.5.0: proxies

Verified sample for npm proxy-agent 6.5.0: proxies. The contract ran on node 22 · linux alpine/x64 · docker and passed: proxies exports an object mapping…

sha256:c1d02b05fcff1675588d2bbfc4dd42b208a911cc10cde3ac82fefc9df687ccc9

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-27

Case

HOW
Goal
verify proxy-agent.proxies in pkg:npm/proxy-agent@6.5.0
Packages
Symbols
  • proxy-agent.proxies
Environment
node 22.23.2
Created
2026-08-27T11:26:33Z

Contract

  1. proxies exports an object mapping supported proxy protocols to constructor loaders
  2. proxies includes loaders for http, https, socks, and pac protocol families
  3. each protocol entry provides a two-element tuple of lazy agent constructor factory functions
  4. http loaders resolve to HttpProxyAgent and HttpsProxyAgent constructors
  5. socks loaders resolve to SocksProxyAgent constructor
  6. pac loaders resolve to PacProxyAgent constructor
  7. instantiating resolved proxy agent constructors parses target proxy URL correctly

Files

  • PROMPT.md
  • csx.json
  • index.js
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.mjs

Download the source artifact (tar.gz)

Source

PROMPT.md
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.
csx.json
{"case":{"caseId":"case:sha256:3d243508844280d489af80b0b622b029ff89395b762cf4b57c461f461f781f33","constraints":{"executionContext":"node"},"contract":["proxies exports an object mapping supported proxy protocols to constructor loaders","proxies includes loaders for http, https, socks, and pac protocol families","each protocol entry provides a two-element tuple of lazy agent constructor factory functions","http loaders resolve to HttpProxyAgent and HttpsProxyAgent constructors","socks loaders resolve to SocksProxyAgent constructor","pac loaders resolve to PacProxyAgent constructor","instantiating resolved proxy agent constructors parses target proxy URL correctly"],"goal":"verify proxy-agent.proxies in pkg:npm/proxy-agent@6.5.0","kind":"HOW","packages":["pkg:npm/proxy-agent@6.5.0"],"schemaVersion":1,"symbols":["proxy-agent.proxies"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/proxy-agent@6.5.0"],"schemaVersion":1,"subject":"pkg:npm/proxy-agent@6.5.0","symbols":["proxy-agent.proxies"],"verifierAdapter":"node-typescript@1"}
index.js
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;
package-lock.json
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}
package.json
{
  "name": "sample-proxy-agent",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "proxy-agent": "6.5.0"
  }
}
spec.json
{
  "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"
  }
}
test/contract.mjs
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.');

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