encodeurl 2.0.0

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/encodeurl@2.0.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/encodeurl@2.0.0

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:sha256:5632a820353e2e8a7d32d504986e2fc97fde0a6f0e90b9f25bcef5a0675cdddb","contract":["encodeurl encodes spaces and non-ASCII Unicode characters into valid percent-encoded UTF-8 bytes","encodeurl preserves valid existing percent-encoded sequences without double-encoding","encodeurl escapes invalid percent sequences such as incomplete or non-hex escape sequences","encodeurl safely handles unmatched surrogate pairs by replacing them with the Unicode replacement character before encoding"],"goal":"verify pkg:npm/encodeurl@2.0.0","kind":"HOW","packages":["pkg:npm/encodeurl@2.0.0"],"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","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/encodeurl@2.0.0"],"schemaVersion":1,"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-encodeurl",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-encodeurl",
      "version": "1.0.0",
      "dependencies": {
        "encodeurl": "2.0.0"
      }
    },
    "node_modules/encodeurl": {
      "version": "2.0.0",
      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-2.0.0.tgz",
      "integrity": "sha512-Q0n9HRi4m6JuGIV1eFlmvJB7ZEVxu93IrMyiMsGC0lrMJMWzRgx6WGquyfQgZVb31vhGgXnfmPNNXmxnOkRBrg==",
      "license": "MIT",
      "engines": {
        "node": ">= 0.8"
      }
    }
  }
}

{
  "name": "sample-encodeurl",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "encodeurl": "2.0.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/encodeurl@2.0.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/encodeurl@2.0.0"
  ]
}

import assert from 'node:assert/strict';
import encodeUrl from 'encodeurl';

// 1. encodeurl encodes spaces and non-ASCII Unicode characters into valid percent-encoded UTF-8 bytes
assert.equal(
  encodeUrl('http://localhost/path with spaces?q=hello world'),
  'http://localhost/path%20with%20spaces?q=hello%20world'
);
assert.equal(
  encodeUrl('http://localhost/path/한글?item=테스트'),
  'http://localhost/path/%ED%95%9C%EA%B8%80?item=%ED%85%8C%EC%8A%A4%ED%8A%B8'
);

// 2. encodeurl preserves valid existing percent-encoded sequences without double-encoding
assert.equal(
  encodeUrl('http://localhost/already%20encoded%2Fpath?param=%3Ftest'),
  'http://localhost/already%20encoded%2Fpath?param=%3Ftest'
);

// 3. encodeurl escapes invalid percent sequences such as incomplete or non-hex escape sequences
assert.equal(
  encodeUrl('http://localhost/invalid%G1%2%foo%'),
  'http://localhost/invalid%25G1%252%25foo%25'
);

// 4. encodeurl safely handles unmatched surrogate pairs by replacing them with the Unicode replacement character before encoding
assert.equal(
  encodeUrl('http://localhost/surrogate-\uD800-tail'),
  'http://localhost/surrogate-%EF%BF%BD-tail'
);

console.log('Contract tests passed successfully.');