encodeurl 1.0.2: encodeUrl

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 encodeUrl in pkg:npm/encodeurl@1.0.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/encodeurl@1.0.2
Demonstrate these symbols/APIs:
  - encodeUrl

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:sha256:0803a5b0eaf1d2c54f24a37355e11fec0228511fd4f5e68d1c11d7a19a276e8a","contract":["encodeUrl(url) percent-encodes unencoded characters in a URL string","encodeUrl(url) preserves already valid percent-encoded sequences without double-encoding","encodeUrl(url) percent-encodes invalid percent sequences","encodeUrl(url) preserves standard URL delimiters and structural characters","encodeUrl(url) replaces unmatched surrogate pairs with the unicode replacement character before encoding"],"goal":"verify encodeUrl in pkg:npm/encodeurl@1.0.2","kind":"HOW","packages":["pkg:npm/encodeurl@1.0.2"],"schemaVersion":1,"symbols":["encodeUrl"]},"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@1.0.2"],"schemaVersion":1,"subject":"pkg:npm/encodeurl@1.0.2","symbols":["encodeUrl"],"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": "1.0.2"
      }
    },
    "node_modules/encodeurl": {
      "version": "1.0.2",
      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
      "integrity": "sha512-TPJXq8JqFaVYm2CWmPvnP2Iyo4ZSM7/QKcSmuMLDObfpH5fi7RUGmd/rTDf+rut/saiDiQEeVTNgAmJEdAOx0w==",
      "license": "MIT",
      "engines": {
        "node": ">= 0.8"
      }
    }
  }
}

{
  "name": "sample-encodeurl",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "encodeurl": "1.0.2"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify encodeUrl in pkg:npm/encodeurl@1.0.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/encodeurl@1.0.2"
  ],
  "symbols": [
    "encodeUrl"
  ]
}

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

// 1. encodeUrl(url) percent-encodes unencoded characters in a URL string
assert.equal(
  encodeUrl('http://localhost/path with spaces/file.txt'),
  'http://localhost/path%20with%20spaces/file.txt'
);
assert.equal(
  encodeUrl('http://localhost/путь/файл.txt'),
  'http://localhost/%D0%BF%D1%83%D1%82%D1%8C/%D1%84%D0%B0%D0%B9%D0%BB.txt'
);

// 2. encodeUrl(url) preserves already valid percent-encoded sequences without double-encoding
assert.equal(
  encodeUrl('http://localhost/already%20encoded%2Fpath'),
  'http://localhost/already%20encoded%2Fpath'
);
assert.equal(
  encodeUrl('http://localhost/mixed%20and unencoded'),
  'http://localhost/mixed%20and%20unencoded'
);

// 3. encodeUrl(url) percent-encodes invalid percent sequences
assert.equal(
  encodeUrl('http://localhost/%zz/test'),
  'http://localhost/%25zz/test'
);
assert.equal(
  encodeUrl('http://localhost/%'),
  'http://localhost/%25'
);
assert.equal(
  encodeUrl('http://localhost/%foo'),
  'http://localhost/%25foo'
);

// 4. encodeUrl(url) preserves standard URL delimiters and structural characters
assert.equal(
  encodeUrl('http://localhost:8080/path?query=val&foo=bar#section'),
  'http://localhost:8080/path?query=val&foo=bar#section'
);

// 5. encodeUrl(url) replaces unmatched surrogate pairs with the unicode replacement character before encoding
assert.equal(
  encodeUrl('http://localhost/\uD800'),
  'http://localhost/%EF%BF%BD'
);