validate-npm-package-name 6.0.2: validate

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 validate in pkg:npm/validate-npm-package-name@6.0.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/validate-npm-package-name@6.0.2
Demonstrate these symbols/APIs:
  - validate

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:fc696e4db058fc13a755f1d77a157c90f73098a68bdb8e24716f4cc64befd8ec","contract":["validate('my-valid-package') and validate('@scope/my-pkg') return { validForNewPackages: true, validForOldPackages: true } with warnings and errors properties omitted","validate('MyPackage') and validate('http') return { validForNewPackages: false, validForOldPackages: true, warnings: [...] } for legacy-only names","validate(null), validate(42), validate('.hidden-pkg'), and validate('node_modules') return { validForNewPackages: false, validForOldPackages: false, errors: [...] } for invalid names"],"goal":"verify validate in pkg:npm/validate-npm-package-name@6.0.2","kind":"HOW","packages":["pkg:npm/validate-npm-package-name@6.0.2"],"schemaVersion":1,"symbols":["validate"]},"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/validate-npm-package-name@6.0.2"],"schemaVersion":1,"subject":"pkg:npm/validate-npm-package-name@6.0.2","symbols":["validate"],"verifierAdapter":"node-typescript@1"}

{
  "name": "validate-npm-package-name-sample",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "validate-npm-package-name-sample",
      "version": "1.0.0",
      "dependencies": {
        "validate-npm-package-name": "6.0.2"
      }
    },
    "node_modules/validate-npm-package-name": {
      "version": "6.0.2",
      "resolved": "https://registry.npmjs.org/validate-npm-package-name/-/validate-npm-package-name-6.0.2.tgz",
      "integrity": "sha512-IUoow1YUtvoBBC06dXs8bR8B9vuA3aJfmQNKMoaPG/OFsPmoQvw8xh+6Ye25Gx9DQhoEom3Pcu9MKHerm/NpUQ==",
      "license": "ISC",
      "engines": {
        "node": "^18.17.0 || >=20.5.0"
      }
    }
  }
}

{
  "name": "validate-npm-package-name-sample",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "validate-npm-package-name": "6.0.2"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify validate in pkg:npm/validate-npm-package-name@6.0.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/validate-npm-package-name@6.0.2"
  ],
  "symbols": [
    "validate"
  ]
}

import assert from 'node:assert/strict';
import validate from 'validate-npm-package-name';

// 1. Valid new and old package names (unscoped and scoped)
const validUnscoped = validate('my-valid-package');
assert.deepEqual(validUnscoped, {
  validForNewPackages: true,
  validForOldPackages: true,
});
assert.equal('warnings' in validUnscoped, false);
assert.equal('errors' in validUnscoped, false);

const validScoped = validate('@scope/my-pkg');
assert.deepEqual(validScoped, {
  validForNewPackages: true,
  validForOldPackages: true,
});

// 2. Legacy valid (validForOldPackages: true, validForNewPackages: false, warnings populated)
const capitalName = validate('MyPackage');
assert.deepEqual(capitalName, {
  validForNewPackages: false,
  validForOldPackages: true,
  warnings: ['name can no longer contain capital letters'],
});

const builtinName = validate('http');
assert.deepEqual(builtinName, {
  validForNewPackages: false,
  validForOldPackages: true,
  warnings: ['http is a core module name'],
});

// 3. Invalid names (validForNewPackages: false, validForOldPackages: false, errors populated)
const nullName = validate(null);
assert.deepEqual(nullName, {
  validForNewPackages: false,
  validForOldPackages: false,
  errors: ['name cannot be null'],
});

const nonStringName = validate(42);
assert.deepEqual(nonStringName, {
  validForNewPackages: false,
  validForOldPackages: false,
  errors: ['name must be a string'],
});

const periodStart = validate('.hidden-pkg');
assert.deepEqual(periodStart, {
  validForNewPackages: false,
  validForOldPackages: false,
  errors: ['name cannot start with a period'],
});

const excludedName = validate('node_modules');
assert.deepEqual(excludedName, {
  validForNewPackages: false,
  validForOldPackages: false,
  errors: ['node_modules is not a valid package name'],
});