socks 2.8.9: SocksClientError

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 socks.SocksClientError in pkg:npm/socks@2.8.9
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/socks@2.8.9
Demonstrate these symbols/APIs:
  - socks.SocksClientError

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:sha256:4c9dd4f2f0dcf92d91dd95e1b1541a006d44dadefef1643ebcb2947127599199","contract":["assert SocksClientError is an instance of Error","assert SocksClientError retains error message and client options","assert SocksClient emits or rejects with SocksClientError on connection failure"],"goal":"verify socks.SocksClientError in pkg:npm/socks@2.8.9","kind":"HOW","packages":["pkg:npm/socks@2.8.9"],"schemaVersion":1,"symbols":["socks.SocksClientError"]},"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/socks@2.8.9"],"schemaVersion":1,"subject":"pkg:npm/socks@2.8.9","symbols":["socks.SocksClientError"],"verifierAdapter":"node-typescript@1"}

import { SocksClient, SocksClientError } from 'socks';

/**
 * Creates a SocksClient error with custom options.
 * @param {string} message
 * @param {object} options
 * @returns {SocksClientError}
 */
export function createClientError(message, options) {
  return new SocksClientError(message, options);
}

/**
 * Attempts to connect through a SOCKS proxy, catching any SocksClientError.
 * @param {object} options
 * @returns {Promise<object>}
 */
export async function attemptConnection(options) {
  try {
    const info = await SocksClient.createConnection(options);
    return { success: true, info };
  } catch (err) {
    if (err instanceof SocksClientError) {
      return { success: false, error: err };
    }
    throw err;
  }
}

export { SocksClient, SocksClientError };

{
  "name": "socks-client-error-sample",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "socks-client-error-sample",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "socks": "2.8.9"
      }
    },
    "node_modules/ip-address": {
      "version": "10.5.0",
      "resolved": "https://registry.npmjs.org/ip-address/-/ip-address-10.5.0.tgz",
      "integrity": "sha512-R5SnVLJmgYYvf2F2ZgwSBnelz5G4q5AxIC277GDfUaNbrZKNANcBC7RHqYYePlszf4kBolVkJauG0ZjHHFh55g==",
      "license": "MIT",
      "engines": {
        "node": ">= 12"
      }
    },
    "node_modules/smart-buffer": {
      "version": "4.2.0",
      "resolved": "https://registry.npmjs.org/smart-buffer/-/smart-buffer-4.2.0.tgz",
      "integrity": "sha512-94hK0Hh8rPqQl2xXc3HsaBoOXKV20MToPkcXvwbISWLEs+64sBq5kFgn2kJDHb1Pry9yrP0dxrCI9RRci7RXKg==",
      "license": "MIT",
      "engines": {
        "node": ">= 6.0.0",
        "npm": ">= 3.0.0"
      }
    },
    "node_modules/socks": {
      "version": "2.8.9",
      "resolved": "https://registry.npmjs.org/socks/-/socks-2.8.9.tgz",
      "integrity": "sha512-LJhUYUvItdQ0LkJTmPeaEObWXAqFyfmP85x0tch/ez9cahmhlBBLbIqDFnvBnUJGagb0JbIQrkBs1wJ+yRYpEw==",
      "license": "MIT",
      "dependencies": {
        "ip-address": "^10.1.1",
        "smart-buffer": "^4.2.0"
      },
      "engines": {
        "node": ">= 10.0.0",
        "npm": ">= 3.0.0"
      }
    }
  }
}

{
  "name": "socks-client-error-sample",
  "version": "1.0.0",
  "description": "Demonstrate socks.SocksClientError usage and behavior",
  "main": "index.mjs",
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "socks": "2.8.9"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify socks.SocksClientError in pkg:npm/socks@2.8.9",
  "kind": "HOW",
  "packages": [
    "pkg:npm/socks@2.8.9"
  ],
  "symbols": [
    "socks.SocksClientError"
  ]
}

import assert from 'node:assert/strict';
import { SocksClient, SocksClientError } from 'socks';
import { createClientError, attemptConnection } from '../index.mjs';

// 1. Assert SocksClientError class exists and extends Error
assert.equal(typeof SocksClientError, 'function', 'SocksClientError should be a constructor function');
const sampleOptions = {
  proxy: {
    ipaddress: '127.0.0.1',
    port: 1080,
    type: 5
  },
  command: 'connect',
  destination: {
    host: 'localhost',
    port: 80
  }
};

const customError = createClientError('connection failed to proxy', sampleOptions);
assert(customError instanceof Error, 'customError must be an instance of Error');
assert(customError instanceof SocksClientError, 'customError must be an instance of SocksClientError');
assert.equal(customError.message, 'connection failed to proxy', 'error message must match');
assert.deepEqual(customError.options, sampleOptions, 'error options must match');

// 2. Assert SocksClient.createConnection emits/rejects with SocksClientError on unreachable proxy
const unreachableOptions = {
  proxy: {
    ipaddress: '127.0.0.1',
    port: 59998,
    type: 5
  },
  command: 'connect',
  destination: {
    host: '127.0.0.1',
    port: 8080
  },
  timeout: 1000
};

const result = await attemptConnection(unreachableOptions);
assert.equal(result.success, false, 'connection should fail on closed port');
assert(result.error instanceof SocksClientError, 'error should be an instance of SocksClientError');
assert(result.error instanceof Error, 'error should be an instance of Error');
assert(result.error.message.length > 0, 'error message should not be empty');
assert.equal(result.error.options.proxy.port, 59998, 'error options proxy port should match');

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