mdurl 2.1.0: encode

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 mdurl.encode in pkg:npm/mdurl@2.1.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/mdurl@2.1.0
Demonstrate these symbols/APIs:
  - mdurl.encode

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:f3761a3c03afc2565155e04e61e193f79cbd425e83334f85da7226bc11b2d803","contract":["encode percent-encodes spaces and non-ASCII or unsafe characters with default excluded characters","encode preserves existing valid percent-encoded sequences by default","encode encodes percent signs in valid escape sequences when keepEscaped is false","encode encodes query delimiters when componentChars is passed as exclude","encode exposes defaultChars and componentChars character sets"],"goal":"verify mdurl.encode in pkg:npm/mdurl@2.1.0","kind":"HOW","packages":["pkg:npm/mdurl@2.1.0"],"schemaVersion":1,"symbols":["mdurl.encode"]},"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","symbols":["mdurl.encode"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-mdurl-encode",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-mdurl-encode",
      "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-encode",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room sample verifying mdurl.encode in pkg:npm/mdurl@2.1.0",
  "dependencies": {
    "mdurl": "2.1.0"
  }
}

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

import assert from 'node:assert';
import { encode } from 'mdurl';

// 1. encode percent-encodes spaces and non-ASCII or unsafe characters with default excluded characters
assert.strictEqual(encode('hello world!'), 'hello%20world!');
assert.strictEqual(encode('foo^bar'), 'foo%5Ebar');

// 2. encode preserves existing valid percent-encoded sequences by default
assert.strictEqual(encode('hello%20world'), 'hello%20world');
assert.strictEqual(encode('%AA%bb'), '%AA%bb');
assert.strictEqual(encode('%2G'), '%252G');

// 3. encode encodes percent signs in valid escape sequences when keepEscaped is false
assert.strictEqual(encode('%20', false), '%2520');
assert.strictEqual(encode('hello%20world', false), 'hello%2520world');

// 4. encode encodes query delimiters when componentChars is passed as exclude
assert.strictEqual(encode('foo?bar=1&baz=2', encode.componentChars), 'foo%3Fbar%3D1%26baz%3D2');

// 5. encode exposes defaultChars and componentChars character sets
assert.strictEqual(encode.defaultChars, ";/?:@&=+$,-_.!~*'()#");
assert.strictEqual(encode.componentChars, "-_.!~*'()");

console.log('Contract passed');