semver 7.8.5: clean version strings with semver.clean

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: clean version strings with semver.clean
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/semver@7.8.5
Demonstrate these symbols/APIs:
  - semver.clean
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:daac483ef5c725da851ceae52112b30b467ea109d2c0b33966c118767479a77a","constraints":{"executionContext":"node"},"contract":["clean strips leading equals signs and v prefixes from version strings","clean trims surrounding whitespace from version strings","clean preserves valid prerelease identifiers","clean returns null for invalid version strings and range operators","clean supports loose option for non-standard version strings","clean returns null for empty string"],"goal":"clean version strings with semver.clean","kind":"HOW","packages":["pkg:npm/semver@7.8.5"],"schemaVersion":1,"symbols":["semver.clean"]},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","ecosystem":"npm","executionContext":"node","language":"javascript","moduleSystem":"cjs","os":"windows","osVersionBucket":"11","packageManager":"npm","runtime":"node","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/semver@7.8.5"],"schemaVersion":1,"symbols":["semver.clean"],"verifierAdapter":"node-typescript@1"}

const semver = require('semver');

function cleanVersion(version, options) {
  return semver.clean(version, options);
}

module.exports = {
  clean: semver.clean,
  cleanVersion
};

{
  "name": "sample",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample",
      "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",
  "version": "1.0.0",
  "private": true,
  "main": "index.js",
  "dependencies": {
    "semver": "7.8.5"
  }
}

{
  "schemaVersion": 1,
  "goal": "clean version strings with semver.clean",
  "kind": "HOW",
  "packages": [
    "pkg:npm/semver@7.8.5"
  ],
  "symbols": [
    "semver.clean"
  ],
  "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 { clean, cleanVersion } = require('../index.js');

// Assertion 1: clean strips leading equals signs and v prefixes from version strings
assert.strictEqual(clean('=v1.2.3'), '1.2.3');
assert.strictEqual(clean('v1.2.3'), '1.2.3');
assert.strictEqual(clean('=1.2.3'), '1.2.3');
assert.strictEqual(cleanVersion('===v2.0.0'), '2.0.0');

// Assertion 2: clean trims surrounding whitespace from version strings
assert.strictEqual(clean('  1.2.3  '), '1.2.3');
assert.strictEqual(clean('   =v1.2.3   '), '1.2.3');
assert.strictEqual(cleanVersion('\t=v3.4.5\n'), '3.4.5');

// Assertion 3: clean preserves valid prerelease identifiers
assert.strictEqual(clean('1.2.3-beta.1'), '1.2.3-beta.1');
assert.strictEqual(clean('v2.0.0-alpha.5'), '2.0.0-alpha.5');
assert.strictEqual(cleanVersion('  =v1.0.0-rc.1  '), '1.0.0-rc.1');

// Assertion 4: clean returns null for invalid version strings and range operators
assert.strictEqual(clean('~1.2.3'), null);
assert.strictEqual(clean('^1.2.3'), null);
assert.strictEqual(clean('>=1.2.3'), null);
assert.strictEqual(clean('invalid'), null);
assert.strictEqual(cleanVersion('1.2.x'), null);

// Assertion 5: clean supports loose option for non-standard version strings
assert.strictEqual(clean('  =v1.2.3-4  ', { loose: true }), '1.2.3-4');
assert.strictEqual(cleanVersion(' =v2.0.0-01 ', { loose: true }), '2.0.0-1');

// Assertion 6: clean returns null for empty string
assert.strictEqual(clean(''), null);
assert.strictEqual(clean('   '), null);
assert.strictEqual(cleanVersion(''), null);

console.log('PASS: all contract assertions passed for semver.clean');