semver 7.8.5: compare version numbers with semver.cmp

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: compare version numbers with semver.cmp
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/semver@7.8.5
Demonstrate these symbols/APIs:
  - cmp
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@11.8.0
  - runtime: node@24.13.1

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:sha256:32d5b739a4649eeebada11fdc9288b6ff99427265eb29691259601898a2013e8","constraints":{"executionContext":"node"},"contract":["semver.cmp correctly evaluates equality operators (=, ==, ===, !=, !==)","semver.cmp correctly evaluates relational operators (\u003c, \u003c=, \u003e, \u003e=)","semver.cmp correctly compares prerelease versions","semver.cmp throws TypeError for invalid comparator operators","compareVersions wrapper correctly compares versions using comparison operators"],"goal":"compare version numbers with semver.cmp","kind":"HOW","packages":["pkg:npm/semver@7.8.5"],"schemaVersion":1,"symbols":["cmp"]},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","ecosystem":"npm","executionContext":"node","language":"javascript","moduleSystem":"cjs","os":"windows","osVersionBucket":"11","packageManager":"npm","packageManagerVersion":"10","runtime":"node","runtimeVersion":"22","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/semver@7.8.5"],"schemaVersion":1,"symbols":["cmp"],"verifierAdapter":"node-typescript@1"}

const semver = require('semver');

/**
 * Compares two semantic version strings using a specified operator.
 *
 * @param {string} v1 - First semantic version
 * @param {string} operator - Comparison operator ('<', '<=', '>', '>=', '==', '===', '!=', '!==')
 * @param {string} v2 - Second semantic version
 * @param {boolean|object} [optionsOrLoose] - Optional loose boolean or semver options
 * @returns {boolean} Result of the comparison
 */
function compareVersions(v1, operator, v2, optionsOrLoose) {
  return semver.cmp(v1, operator, v2, optionsOrLoose);
}

module.exports = {
  compareVersions
};

{
  "name": "sample-semver-cmp",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-semver-cmp",
      "version": "1.0.0",
      "dependencies": {
        "semver": "7.8.5"
      }
    },
    "node_modules/semver": {
      "version": "7.8.5",
      "resolved": "https://registry.npmjs.org/semver/-/semver-7.8.5.tgz",
      "integrity": "sha512-Y7/KDsb8LjooZpwaqGyulO6DQlksgCncchHGk+sZIY4SBvUocMBEFH5Ur1fI4dV+Jvl0w6cjvucaIi40puRioA==",
      "license": "ISC",
      "bin": {
        "semver": "bin/semver.js"
      },
      "engines": {
        "node": ">=10"
      }
    }
  }
}

{
  "name": "sample-semver-cmp",
  "version": "1.0.0",
  "private": true,
  "main": "index.js",
  "dependencies": {
    "semver": "7.8.5"
  }
}

{
  "schemaVersion": 1,
  "goal": "compare version numbers with semver.cmp",
  "kind": "HOW",
  "packages": [
    "pkg:npm/semver@7.8.5"
  ],
  "symbols": [
    "cmp"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@11.8.0",
    "runtime": "node@24.13.1"
  }
}

const assert = require('assert');
const semver = require('semver');
const { compareVersions } = require('../index');

// 1. semver.cmp correctly evaluates equality operators (=, ==, ===, !=, !==)
assert.strictEqual(
  semver.cmp('1.2.3', '===', '1.2.3'),
  true,
  '1.2.3 === 1.2.3 should be true'
);
assert.strictEqual(
  semver.cmp('1.2.3', '===', '1.2.4'),
  false,
  '1.2.3 === 1.2.4 should be false'
);
assert.strictEqual(
  semver.cmp('1.2.3', '==', '1.2.3'),
  true,
  '1.2.3 == 1.2.3 should be true'
);
assert.strictEqual(
  semver.cmp('1.2.3', '=', '1.2.3'),
  true,
  '1.2.3 = 1.2.3 should be true'
);
assert.strictEqual(
  semver.cmp('1.2.3', '!==', '1.2.4'),
  true,
  '1.2.3 !== 1.2.4 should be true'
);
assert.strictEqual(
  semver.cmp('1.2.3', '!==', '1.2.3'),
  false,
  '1.2.3 !== 1.2.3 should be false'
);
assert.strictEqual(
  semver.cmp('1.2.3', '!=', '1.2.4'),
  true,
  '1.2.3 != 1.2.4 should be true'
);

// 2. semver.cmp correctly evaluates relational operators (<, <=, >, >=)
assert.strictEqual(
  semver.cmp('1.0.0', '<', '2.0.0'),
  true,
  '1.0.0 < 2.0.0 should be true'
);
assert.strictEqual(
  semver.cmp('2.0.0', '<', '1.0.0'),
  false,
  '2.0.0 < 1.0.0 should be false'
);
assert.strictEqual(
  semver.cmp('1.0.0', '<=', '1.0.0'),
  true,
  '1.0.0 <= 1.0.0 should be true'
);
assert.strictEqual(
  semver.cmp('1.0.0', '<=', '2.0.0'),
  true,
  '1.0.0 <= 2.0.0 should be true'
);
assert.strictEqual(
  semver.cmp('2.0.0', '>', '1.0.0'),
  true,
  '2.0.0 > 1.0.0 should be true'
);
assert.strictEqual(
  semver.cmp('1.0.0', '>', '2.0.0'),
  false,
  '1.0.0 > 2.0.0 should be false'
);
assert.strictEqual(
  semver.cmp('1.0.0', '>=', '1.0.0'),
  true,
  '1.0.0 >= 1.0.0 should be true'
);
assert.strictEqual(
  semver.cmp('2.0.0', '>=', '1.0.0'),
  true,
  '2.0.0 >= 1.0.0 should be true'
);
assert.strictEqual(
  semver.cmp('1.0.0', '>=', '2.0.0'),
  false,
  '1.0.0 >= 2.0.0 should be false'
);

// 3. semver.cmp correctly compares prerelease versions
assert.strictEqual(
  semver.cmp('1.0.0-alpha.1', '<', '1.0.0-alpha.2'),
  true,
  '1.0.0-alpha.1 < 1.0.0-alpha.2 should be true'
);
assert.strictEqual(
  semver.cmp('1.0.0-alpha', '<', '1.0.0'),
  true,
  '1.0.0-alpha < 1.0.0 should be true'
);
assert.strictEqual(
  semver.cmp('1.0.0-beta', '>', '1.0.0-alpha'),
  true,
  '1.0.0-beta > 1.0.0-alpha should be true'
);

// 4. semver.cmp throws TypeError for invalid comparator operators
assert.throws(
  () => {
    semver.cmp('1.0.0', 'invalid', '2.0.0');
  },
  TypeError,
  'semver.cmp should throw TypeError for invalid operator'
);

// 5. compareVersions wrapper correctly compares versions using comparison operators
assert.strictEqual(
  compareVersions('1.5.0', '<', '2.0.0'),
  true,
  'compareVersions returns true when 1.5.0 < 2.0.0'
);
assert.strictEqual(
  compareVersions('2.0.0', '===', '2.0.0'),
  true,
  'compareVersions returns true when 2.0.0 === 2.0.0'
);
assert.strictEqual(
  compareVersions('1.0.0', '>', '2.0.0'),
  false,
  'compareVersions returns false when 1.0.0 > 2.0.0'
);

console.log('All contract tests passed!');