encodeurl 1.0.2

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@1.0.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/encodeurl@1.0.2
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:sha256:1603846482bcba5e646e897368fa3f46f56edd490c8d3c2ddd3ad75c8786f6f9","constraints":{"executionContext":"node"},"contract":["encodeUrl encodes whitespace in URL path and query string with percent encoding","encodeUrl preserves already-encoded valid percent escape sequences without double encoding","encodeUrl encodes stray percent characters that are not part of valid two-digit hex sequences","encodeUrl encodes Unicode characters and multi-byte UTF-8 sequences in URL components","encodeUrl encodes disallowed ASCII characters such as angle brackets, quotes, and control characters","encodeUrl preserves valid RFC 3986 reserved characters and sub-delimiters","encodeUrl replaces lone surrogate code units with the Unicode replacement character before encoding","encodeUrl coerces non-string arguments to string and encodes the result"],"goal":"verify pkg:npm/encodeurl@1.0.2","kind":"HOW","packages":["pkg:npm/encodeurl@1.0.2"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/encodeurl@1.0.2"],"schemaVersion":1,"subject":"pkg:npm/encodeurl@1.0.2","verifierAdapter":"node-typescript@1"}

{
  "name": "sample-encodeurl-verify",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-encodeurl-verify",
      "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-verify",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "dependencies": {
    "encodeurl": "1.0.2"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/encodeurl@1.0.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/encodeurl@1.0.2"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

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

// 1. encodeUrl encodes whitespace in URL path and query string with percent encoding
{
  const result = encodeUrl('http://example.com/foo bar?baz=hello world');
  assert.strictEqual(result, 'http://example.com/foo%20bar?baz=hello%20world');
}

// 2. encodeUrl preserves already-encoded valid percent escape sequences without double encoding
{
  const result = encodeUrl('http://example.com/foo%20bar?param=%C3%A9%21');
  assert.strictEqual(result, 'http://example.com/foo%20bar?param=%C3%A9%21');
}

// 3. encodeUrl encodes stray percent characters that are not part of valid two-digit hex sequences
{
  const result = encodeUrl('http://example.com/100%_discount_%g1%zz%');
  assert.strictEqual(result, 'http://example.com/100%25_discount_%25g1%25zz%25');
}

// 4. encodeUrl encodes Unicode characters and multi-byte UTF-8 sequences in URL components
{
  const result = encodeUrl('http://example.com/café/üñîçødè?snow=雪');
  assert.strictEqual(result, 'http://example.com/caf%C3%A9/%C3%BC%C3%B1%C3%AE%C3%A7%C3%B8d%C3%A8?snow=%E9%9B%AA');
}

// 5. encodeUrl encodes disallowed ASCII characters such as angle brackets, quotes, and control characters
{
  const result = encodeUrl('http://example.com/<tag>"quotes"{brackets}|pipes\x00\x1f');
  assert.strictEqual(result, 'http://example.com/%3Ctag%3E%22quotes%22%7Bbrackets%7D%7Cpipes%00%1F');
}

// 6. encodeUrl preserves valid RFC 3986 reserved characters and sub-delimiters
{
  const url = 'http://example.com:8080/path/to/resource?query=1&b=2#section;sub+item';
  const result = encodeUrl(url);
  assert.strictEqual(result, url);
}

// 7. encodeUrl replaces lone surrogate code units with the Unicode replacement character before encoding
{
  const highSurrogate = encodeUrl('http://example.com/\uD800');
  assert.strictEqual(highSurrogate, 'http://example.com/%EF%BF%BD');

  const lowSurrogate = encodeUrl('http://example.com/\uDC00');
  assert.strictEqual(lowSurrogate, 'http://example.com/%EF%BF%BD');

  const validPair = encodeUrl('http://example.com/\uD800\uDC00');
  assert.strictEqual(validPair, 'http://example.com/%F0%90%80%80');
}

// 8. encodeUrl coerces non-string arguments to string and encodes the result
{
  assert.strictEqual(encodeUrl(12345), '12345');
  assert.strictEqual(encodeUrl(null), 'null');
  assert.strictEqual(encodeUrl(undefined), 'undefined');
  assert.strictEqual(encodeUrl({ toString: () => 'http://example.com/foo bar' }), 'http://example.com/foo%20bar');
}

console.log('All contracts passed.');