to-regex-range 5.0.1

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/to-regex-range@5.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/to-regex-range@5.0.1
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:sha256:57d1849b2add5002f4632054c674ad6c920f47c43241d750fa484a5062dfbd11","constraints":{"executionContext":"node"},"contract":["toRegexRange generates regex patterns matching positive, negative, and zero-spanning integer ranges","toRegexRange automatically handles inverted ranges and single number ranges","toRegexRange supports shorthand digit notation and capture group wrapping options","toRegexRange generates regex patterns for zero-padded numeric string ranges"],"goal":"verify pkg:npm/to-regex-range@5.0.1","kind":"HOW","packages":["pkg:npm/to-regex-range@5.0.1"],"schemaVersion":1},"contractCommand":["node","test/contract.js"],"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/to-regex-range@5.0.1"],"schemaVersion":1,"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-to-regex-range",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-to-regex-range",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "to-regex-range": "5.0.1"
      }
    },
    "node_modules/is-number": {
      "version": "7.0.0",
      "resolved": "https://registry.npmjs.org/is-number/-/is-number-7.0.0.tgz",
      "integrity": "sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng==",
      "license": "MIT",
      "engines": {
        "node": ">=0.12.0"
      }
    },
    "node_modules/to-regex-range": {
      "version": "5.0.1",
      "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
      "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
      "license": "MIT",
      "dependencies": {
        "is-number": "^7.0.0"
      },
      "engines": {
        "node": ">=8.0"
      }
    }
  }
}

{
  "name": "sample-to-regex-range",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification sample for to-regex-range",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "to-regex-range": "5.0.1"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/to-regex-range@5.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/to-regex-range@5.0.1"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

const toRegexRange = require('to-regex-range');

function createRegexRange(min, max, options) {
  return toRegexRange(min, max, options);
}

module.exports = {
  createRegexRange
};

const assert = require('node:assert');
const toRegexRange = require('to-regex-range');
const { createRegexRange } = require('../src/index.js');

// 1. Basic numeric and range tests
assert.strictEqual(toRegexRange(1, 5), '[1-5]', 'should generate single-digit character class');
assert.strictEqual(toRegexRange(5, 5), '5', 'should match exact single number when min equals max');
assert.strictEqual(toRegexRange(5, 1), '[1-5]', 'should handle inverted min/max order');
assert.strictEqual(toRegexRange(1, 50), '(?:[1-9]|[1-4][0-9]|50)', 'should generate multi-digit range pattern');

// 2. Negative and spanning ranges
assert.strictEqual(toRegexRange(-5, 5), '(?:-[1-5]|[0-5])', 'should generate pattern for range spanning negative to positive');
assert.strictEqual(toRegexRange(-50, -1), '(?:-[1-9]|-[1-4][0-9]|-50)', 'should generate negative range pattern');

// 3. Options: shorthand and capture
assert.strictEqual(toRegexRange(1, 50, { shorthand: true }), '(?:[1-9]|[1-4]\\d|50)', 'should use \\d with shorthand option');
assert.strictEqual(toRegexRange(1, 5, { capture: true }), '([1-5])', 'should wrap pattern in capture group');
assert.strictEqual(toRegexRange(1, 50, { capture: true }), '([1-9]|[1-4][0-9]|50)', 'should wrap multi-digit pattern in capture group');

// 4. Zero padding
assert.strictEqual(toRegexRange('001', '055'), '(?:0{0,2}[1-9]|0?[1-4][0-9]|0?5[0-5])', 'should support zero-padded strings');

// 5. Functional regex evaluation
const re = new RegExp('^' + toRegexRange(1, 50) + '$');
assert.strictEqual(re.test('1'), true, 'regex should match lower bound');
assert.strictEqual(re.test('25'), true, 'regex should match middle value');
assert.strictEqual(re.test('50'), true, 'regex should match upper bound');
assert.strictEqual(re.test('0'), false, 'regex should reject value below min');
assert.strictEqual(re.test('51'), false, 'regex should reject value above max');
assert.strictEqual(re.test('abc'), false, 'regex should reject non-numeric string');

// 6. Wrapper function verification
assert.strictEqual(createRegexRange(1, 9), '[1-9]', 'wrapper should correctly return regex pattern');
assert.strictEqual(createRegexRange(1, 10, { shorthand: true }), '(?:[1-9]|10)', 'wrapper should pass options through');

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