is-number 7.0.0

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/is-number@7.0.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/is-number@7.0.0

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:sha256:588459d7fe9e4ca3ddd9ab4d3db37b5e066a50ee0d7dd41c33a82b39b4342ae8","contract":["isNumber returns true for finite numbers and numeric strings","isNumber returns false for non-numeric primitives, objects, arrays, NaN, and Infinity"],"goal":"verify pkg:npm/is-number@7.0.0","kind":"HOW","packages":["pkg:npm/is-number@7.0.0"],"schemaVersion":1},"contractCommand":["node","test/contract.js"],"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/is-number@7.0.0"],"schemaVersion":1,"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-is-number",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-is-number",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "is-number": "7.0.0"
      }
    },
    "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"
    }
  }
}

{
  "name": "sample-is-number",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification sample for is-number",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "is-number": "7.0.0"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/is-number@7.0.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/is-number@7.0.0"
  ]
}

const isNumber = require('is-number');

function checkNumber(value) {
  return isNumber(value);
}

module.exports = {
  checkNumber
};

const assert = require('node:assert');
const isNumber = require('is-number');
const { checkNumber } = require('../src/index.js');

// 1. Valid numbers return true
assert.strictEqual(isNumber(0), true, '0 should return true');
assert.strictEqual(isNumber(1), true, 'positive integer should return true');
assert.strictEqual(isNumber(-1), true, 'negative integer should return true');
assert.strictEqual(isNumber(3.14), true, 'floating point should return true');
assert.strictEqual(isNumber(-3.14), true, 'negative floating point should return true');
assert.strictEqual(isNumber(5e3), true, 'exponential number should return true');
assert.strictEqual(isNumber(0xff), true, 'hex number should return true');
assert.strictEqual(checkNumber(42), true, 'wrapper with number should return true');

// 2. Numeric strings return true
assert.strictEqual(isNumber('0'), true, 'string 0 should return true');
assert.strictEqual(isNumber('42'), true, 'string positive integer should return true');
assert.strictEqual(isNumber('-42'), true, 'string negative integer should return true');
assert.strictEqual(isNumber('3.14'), true, 'string float should return true');
assert.strictEqual(isNumber('-3.14'), true, 'string negative float should return true');
assert.strictEqual(isNumber('5e3'), true, 'string exponential should return true');
assert.strictEqual(isNumber('0xff'), true, 'string hex should return true');
assert.strictEqual(isNumber('  123  '), true, 'string with whitespace should return true');
assert.strictEqual(checkNumber('100'), true, 'wrapper with numeric string should return true');

// 3. Non-numeric values return false
assert.strictEqual(isNumber(NaN), false, 'NaN should return false');
assert.strictEqual(isNumber(Infinity), false, 'Infinity should return false');
assert.strictEqual(isNumber(-Infinity), false, '-Infinity should return false');
assert.strictEqual(isNumber(''), false, 'empty string should return false');
assert.strictEqual(isNumber('   '), false, 'whitespace string should return false');
assert.strictEqual(isNumber('abc'), false, 'alphabetic string should return false');
assert.strictEqual(isNumber(null), false, 'null should return false');
assert.strictEqual(isNumber(undefined), false, 'undefined should return false');
assert.strictEqual(isNumber(true), false, 'true should return false');
assert.strictEqual(isNumber(false), false, 'false should return false');
assert.strictEqual(isNumber([]), false, 'empty array should return false');
assert.strictEqual(isNumber([1]), false, 'non-empty array should return false');
assert.strictEqual(isNumber({}), false, 'object should return false');
assert.strictEqual(isNumber(() => {}), false, 'function should return false');
assert.strictEqual(isNumber(Symbol('num')), false, 'symbol should return false');

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