pac-proxy-agent 7.2.0

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/pac-proxy-agent@7.2.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/pac-proxy-agent@7.2.0

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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{
  "name": "sample-pac-proxy-agent",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "pac-proxy-agent": "7.2.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/pac-proxy-agent@7.2.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/pac-proxy-agent@7.2.0"
  ]
}

import assert from 'node:assert/strict';
import { PacProxyAgent } from 'pac-proxy-agent';

// 1. PacProxyAgent static protocols property includes supported PAC protocol schemes
assert.ok(Array.isArray(PacProxyAgent.protocols));
assert.ok(PacProxyAgent.protocols.includes('pac+data'));
assert.ok(PacProxyAgent.protocols.includes('pac+file'));
assert.ok(PacProxyAgent.protocols.includes('pac+http'));
assert.ok(PacProxyAgent.protocols.includes('pac+https'));

// 2. PacProxyAgent constructor initializes agent instance with data URI string
const pacScript = `
  function FindProxyForURL(url, host) {
    if (isPlainHostName(host)) {
      return 'DIRECT';
    }
    if (dnsDomainIs(host, '.internal.example.com')) {
      return 'PROXY proxy-int.example.com:8080';
    }
    if (shExpMatch(host, '*.secure.example.com')) {
      return 'HTTPS proxy-sec.example.com:8443';
    }
    return 'PROXY proxy-default.example.com:3128; DIRECT';
  }
`;
const dataUri = `data:text/plain;charset=utf-8,${encodeURIComponent(pacScript)}`;
const agent = new PacProxyAgent(dataUri);

assert.ok(agent instanceof PacProxyAgent);
assert.equal(agent.uri.href, dataUri);

// 3. getResolver compiles and returns a FindProxyForURL resolver function
const resolver = await agent.getResolver();
assert.equal(typeof resolver, 'function');

// 4. resolver routes plain hostnames to DIRECT when configured by PAC script
const resPlain = await resolver('http://localhost/api', 'localhost');
assert.equal(resPlain, 'DIRECT');

// 5. resolver evaluates dnsDomainIs and returns designated internal proxy
const resInternal = await resolver('http://svc.internal.example.com/data', 'svc.internal.example.com');
assert.equal(resInternal, 'PROXY proxy-int.example.com:8080');

// 6. resolver evaluates shExpMatch wildcard and returns designated secure proxy
const resSecure = await resolver('https://auth.secure.example.com/login', 'auth.secure.example.com');
assert.equal(resSecure, 'HTTPS proxy-sec.example.com:8443');

// 7. resolver returns fallback proxy chain for unmatched external destinations
const resDefault = await resolver('http://external.example.com/resource', 'external.example.com');
assert.equal(resDefault, 'PROXY proxy-default.example.com:3128; DIRECT');

// 8. PacProxyAgent constructor accepts WHATWG URL instance and custom options
const pacUrl = new URL(dataUri);
const agentWithOptions = new PacProxyAgent(pacUrl, {
  fallbackToDirect: true,
  keepAlive: true
});
assert.ok(agentWithOptions instanceof PacProxyAgent);
assert.equal(agentWithOptions.opts.fallbackToDirect, true);
assert.equal(agentWithOptions.opts.keepAlive, true);

const resolverWithOptions = await agentWithOptions.getResolver();
const resWithOptions = await resolverWithOptions('http://internal.example.com', 'internal.example.com');
assert.equal(typeof resWithOptions, 'string');