CodeSampleX

Sample

@babel/core 7.26.10: version

Verified sample for npm @babel/core 7.26.10: version. The contract ran on node 22 · linux debian/x64 · docker and passed: version is exposed as a string…

sha256:204747ef71ce3c55b53351afc1d93bbcfb0c399875e0964d8ef9373b8dd53593

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-16

Case

HOW
Goal
verify @babel/core.version in pkg:npm/%40babel/core@7.26.10
Packages
Symbols
  • @babel/core.version
Environment
node 22.23.2
Created
2026-09-16T22:40:42Z

Contract

  1. version is exposed as a string property on @babel/core
  2. version matches the exact installed package release 7.26.10
  3. version follows semver major.minor.patch numeric format
  4. version can be accessed via property lookup and destructuring import
  5. version property is non-empty and starts with 7.

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.js
  • test/contract.js

Download the source artifact (tar.gz)

Source

PROMPT.md
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 @babel/core.version in pkg:npm/%40babel/core@7.26.10
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.26.10
Demonstrate these symbols/APIs:
  - @babel/core.version

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.
csx.json
{"case":{"caseId":"case:sha256:fd6a312729924f8b3bbf0c59642c3705ec9abd78a97045bcc7ccea370f8086f5","contract":["version is exposed as a string property on @babel/core","version matches the exact installed package release 7.26.10","version follows semver major.minor.patch numeric format","version can be accessed via property lookup and destructuring import","version property is non-empty and starts with 7."],"goal":"verify @babel/core.version in pkg:npm/%40babel/core@7.26.10","kind":"HOW","packages":["pkg:npm/%40babel/core@7.26.10"],"schemaVersion":1,"symbols":["@babel/core.version"]},"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/%40babel/core@7.26.10"],"schemaVersion":1,"subject":"pkg:npm/%40babel/core@7.26.10","symbols":["@babel/core.version"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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  "name": "sample-babel-version",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
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      "name": "sample-babel-version",
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}
package.json
{
  "name": "sample-babel-version",
  "version": "1.0.0",
  "description": "verify @babel/core.version in pkg:npm/%40babel/core@7.26.10",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@babel/core": "7.26.10"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @babel/core.version in pkg:npm/%40babel/core@7.26.10",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.26.10"
  ],
  "symbols": [
    "@babel/core.version"
  ]
}
src/index.js
const babel = require('@babel/core');

/**
 * Returns the version of @babel/core.
 *
 * @returns {string} The version string.
 */
function getBabelVersion() {
  return babel.version;
}

/**
 * Validates whether the @babel/core version follows semver syntax.
 *
 * @returns {boolean} True if semver format matches.
 */
function isValidBabelSemver() {
  const semverPattern = /^\d+\.\d+\.\d+(?:-[\w.]+)?(?:\+[\w.]+)?$/;
  return semverPattern.test(babel.version);
}

module.exports = {
  getBabelVersion,
  isValidBabelSemver,
  version: babel.version
};
test/contract.js
const assert = require('assert');
const babel = require('@babel/core');
const { getBabelVersion, isValidBabelSemver } = require('../src/index');

async function main() {
  // 1. version is exposed as a string property on @babel/core
  {
    assert.strictEqual(typeof babel.version, 'string', 'babel.version must be a string');
    assert.strictEqual(typeof getBabelVersion(), 'string', 'getBabelVersion() must return a string');
  }

  // 2. version matches the exact installed package release 7.26.10
  {
    assert.strictEqual(babel.version, '7.26.10', 'babel.version must match 7.26.10');
    assert.strictEqual(getBabelVersion(), '7.26.10', 'helper function must return 7.26.10');
  }

  // 3. version follows semver major.minor.patch numeric format
  {
    const semverPattern = /^\d+\.\d+\.\d+(?:-[\w.]+)?(?:\+[\w.]+)?$/;
    assert(semverPattern.test(babel.version), 'babel.version must be valid semver');
    assert(isValidBabelSemver(), 'isValidBabelSemver() must return true');
    const parts = babel.version.split('.');
    assert.strictEqual(parts[0], '7', 'major version must be 7');
    assert.strictEqual(parts[1], '26', 'minor version must be 26');
    assert.strictEqual(parts[2], '10', 'patch version must be 10');
  }

  // 4. version can be accessed via property lookup and destructuring import
  {
    const { version } = require('@babel/core');
    assert.strictEqual(version, babel.version, 'destructured version must equal babel.version');
    assert.strictEqual(version, '7.26.10', 'destructured version must be 7.26.10');
  }

  // 5. version property is non-empty and starts with 7.
  {
    assert(babel.version.length > 0, 'babel.version must not be empty');
    assert(babel.version.startsWith('7.'), 'babel.version must start with 7.');
  }

  console.log('All contract assertions passed successfully.');
}

main().catch((err) => {
  console.error('Contract failed:', err);
  process.exit(1);
});

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