entities 6.0.1: decodeHTML

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 entities.decodeHTML in pkg:npm/entities@6.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/entities@6.0.1
Demonstrate these symbols/APIs:
  - entities.decodeHTML

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:sha256:38cca6c53b716c8ea806d32eaeb64d8b3362a02c94faf57b6232c9a6e8e08d77","contract":["decodeHTML decodes named HTML entities into corresponding characters","decodeHTML decodes decimal numeric entities and hexadecimal numeric entities","decodeHTML decodes legacy HTML named entities without trailing semicolons","decodeHTML preserves unrecognized entity names and plain text without modification"],"goal":"verify entities.decodeHTML in pkg:npm/entities@6.0.1","kind":"HOW","packages":["pkg:npm/entities@6.0.1"],"schemaVersion":1,"symbols":["entities.decodeHTML"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/entities@6.0.1"],"schemaVersion":1,"subject":"pkg:npm/entities@6.0.1","symbols":["entities.decodeHTML"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-entities-decodehtml",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-entities-decodehtml",
      "version": "1.0.0",
      "dependencies": {
        "entities": "6.0.1"
      }
    },
    "node_modules/entities": {
      "version": "6.0.1",
      "resolved": "https://registry.npmjs.org/entities/-/entities-6.0.1.tgz",
      "integrity": "sha512-aN97NXWF6AWBTahfVOIrB/NShkzi5H7F9r1s9mD3cDj4Ko5f2qhhVoYMibXF7GlLveb/D2ioWay8lxI97Ven3g==",
      "license": "BSD-2-Clause",
      "engines": {
        "node": ">=0.12"
      },
      "funding": {
        "url": "https://github.com/fb55/entities?sponsor=1"
      }
    }
  }
}

{
  "name": "sample-entities-decodehtml",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "entities": "6.0.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify entities.decodeHTML in pkg:npm/entities@6.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/entities@6.0.1"
  ],
  "symbols": [
    "entities.decodeHTML"
  ]
}

import assert from 'node:assert/strict';
import { decodeHTML } from 'entities';

// 1. decodeHTML decodes named HTML entities into corresponding characters
assert.equal(
  decodeHTML('& < > " ' © € Æ'),
  '& < > " \' © € Æ'
);

// 2. decodeHTML decodes decimal numeric entities and hexadecimal numeric entities
assert.equal(
  decodeHTML('&#38; &#60; &#62; &#34; &#39; &#169;'),
  '& < > " \' ©'
);
assert.equal(
  decodeHTML('&#x26; &#x3c; &#x3e; &#x22; &#x27; &#x2603;'),
  '& < > " \' ☃'
);

// 3. decodeHTML decodes legacy HTML named entities without trailing semicolons
assert.equal(
  decodeHTML('&amp &copy &not'),
  '& © ¬'
);

// 4. decodeHTML preserves unrecognized entity names and plain text without modification
assert.equal(
  decodeHTML('&unknownentity; &foo;'),
  '&unknownentity; &foo;'
);
assert.equal(
  decodeHTML('plain text 123'),
  'plain text 123'
);
assert.equal(
  decodeHTML(''),
  ''
);

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