mdurl 2.1.0

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/mdurl@2.1.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/mdurl@2.1.0

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.

{"case":{"caseId":"case:sha256:0fbcbe5c14d54a5c9e2d15c264bf3f688ba137c542f8788621d5745d9ccc55b8","contract":["parse extracts protocol hostname port pathname search and hash into structured object","parse handles protocol-relative URLs with host extraction when slashesDenoteHost is true","format reconstructs complete URL string from component object","encode percent-encodes special characters while preserving standard URI characters and existing escapes","decode unescapes percent-encoded sequences while preserving invalid escape sequences"],"goal":"verify pkg:npm/mdurl@2.1.0","kind":"HOW","packages":["pkg:npm/mdurl@2.1.0"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/mdurl@2.1.0"],"schemaVersion":1,"subject":"pkg:npm/mdurl@2.1.0","verifierAdapter":"node-typescript@1"}

{
  "name": "sample-mdurl",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-mdurl",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "mdurl": "2.1.0"
      }
    },
    "node_modules/mdurl": {
      "version": "2.1.0",
      "resolved": "https://registry.npmjs.org/mdurl/-/mdurl-2.1.0.tgz",
      "integrity": "sha512-1+HBaOx0zi/dQWht8rNv9MYf9qqpqL/kxI0hXImU6Y547zM6Sni8BQibt7ifgMcYtQg41ao3Ivd6cnSM86inpg==",
      "license": "MIT"
    }
  }
}

{
  "name": "sample-mdurl",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room sample verifying pkg:npm/mdurl@2.1.0 functionality",
  "dependencies": {
    "mdurl": "2.1.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/mdurl@2.1.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/mdurl@2.1.0"
  ]
}

import assert from 'node:assert';
import { parse, format, encode, decode } from 'mdurl';

// 1. parse extracts protocol hostname port pathname search and hash into structured object
const urlStr = 'https://example.com:8080/foo/bar?baz=1#qux';
const parsed = parse(urlStr);
assert.strictEqual(parsed.protocol, 'https:');
assert.strictEqual(parsed.slashes, true);
assert.strictEqual(parsed.hostname, 'example.com');
assert.strictEqual(parsed.port, '8080');
assert.strictEqual(parsed.pathname, '/foo/bar');
assert.strictEqual(parsed.search, '?baz=1');
assert.strictEqual(parsed.hash, '#qux');

// 2. parse handles protocol-relative URLs with host extraction when slashesDenoteHost is true
const protoRel = parse('//example.com/path', true);
assert.strictEqual(protoRel.protocol, null);
assert.strictEqual(protoRel.slashes, true);
assert.strictEqual(protoRel.hostname, 'example.com');
assert.strictEqual(protoRel.pathname, '/path');

// 3. format reconstructs complete URL string from component object
const formatted = format(parsed);
assert.strictEqual(formatted, urlStr);

// 4. encode percent-encodes special characters while preserving standard URI characters and existing escapes
assert.strictEqual(encode('hello world! 100%'), 'hello%20world!%20100%25');
assert.strictEqual(encode('%20', false), '%2520');

// 5. decode unescapes percent-encoded sequences while preserving invalid escape sequences
assert.strictEqual(decode('hello%20world%21%20100%25'), 'hello world! 100%');
assert.strictEqual(decode('%2G'), '%2G');

console.log('Contract passed');