electron-to-chromium 1.5.412: versions

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 electron-to-chromium.versions in pkg:npm/electron-to-chromium@1.5.412
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/electron-to-chromium@1.5.412
Demonstrate these symbols/APIs:
  - electron-to-chromium.versions

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:sha256:11891d024aa5a6374ea5f6beec03f444940a291bec5d9544fc53f4d02f71123b","constraints":{"executionContext":"node"},"contract":["versions is an object mapping Electron major/minor version strings to Chromium major version strings","versions maps legacy Electron versions to Chromium major versions","versions maps modern Electron versions to Chromium major versions","versions returns undefined for unmapped or non-existent Electron versions","versions contains only string keys and string values"],"goal":"verify electron-to-chromium.versions in pkg:npm/electron-to-chromium@1.5.412","kind":"HOW","packages":["pkg:npm/electron-to-chromium@1.5.412"],"schemaVersion":1,"symbols":["electron-to-chromium.versions"]},"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/electron-to-chromium@1.5.412"],"schemaVersion":1,"subject":"pkg:npm/electron-to-chromium@1.5.412","symbols":["electron-to-chromium.versions"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-electron-to-chromium-versions",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-electron-to-chromium-versions",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "electron-to-chromium": "1.5.412"
      }
    },
    "node_modules/electron-to-chromium": {
      "version": "1.5.412",
      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.5.412.tgz",
      "integrity": "sha512-z4rMe3esBzlzovKHj4gxJnsCGZRK5l4baUvm+gCGJBPE+gsyUMKsuU9tnEUtI1dOebXz1ytAPGjvXhmQ7rIPwA==",
      "license": "ISC"
    }
  }
}

{
  "name": "sample-electron-to-chromium-versions",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification sample for electron-to-chromium.versions",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "electron-to-chromium": "1.5.412"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify electron-to-chromium.versions in pkg:npm/electron-to-chromium@1.5.412",
  "kind": "HOW",
  "packages": [
    "pkg:npm/electron-to-chromium@1.5.412"
  ],
  "symbols": [
    "electron-to-chromium.versions"
  ]
}

const { versions } = require('electron-to-chromium');

/**
 * Looks up the Chromium major version for a given Electron version string.
 * @param {string} electronVersion Electron version string (e.g. '1.4', '33.0')
 * @returns {string|undefined} Chromium major version string or undefined if not found
 */
function getChromiumVersion(electronVersion) {
  if (typeof electronVersion !== 'string') {
    return undefined;
  }
  return versions[electronVersion];
}

module.exports = {
  versions,
  getChromiumVersion
};

const assert = require('node:assert');
const { versions, getChromiumVersion } = require('../src/index.js');
const rawEtc = require('electron-to-chromium');

// Verify export matches raw electron-to-chromium export
assert.strictEqual(versions, rawEtc.versions, 'versions should match module export');
assert.strictEqual(typeof versions, 'object', 'versions must be an object');
assert.ok(versions !== null, 'versions must not be null');

// 1. versions is an object mapping Electron major/minor version strings to Chromium major version strings
const keys = Object.keys(versions);
assert.ok(keys.length > 200, 'versions contains major/minor version mappings');
assert.ok(keys.every(k => typeof k === 'string'), 'all keys in versions are string version numbers');
assert.ok(Object.values(versions).every(v => typeof v === 'string'), 'all values in versions are string version numbers');

// 2. versions maps legacy Electron versions to Chromium major versions
assert.strictEqual(versions['0.20'], '39', 'electron 0.20 maps to chromium 39');
assert.strictEqual(versions['1.4'], '53', 'electron 1.4 maps to chromium 53');
assert.strictEqual(getChromiumVersion('0.20'), '39', 'helper getChromiumVersion resolves 0.20');
assert.strictEqual(getChromiumVersion('1.4'), '53', 'helper getChromiumVersion resolves 1.4');

// 3. versions maps modern Electron versions to Chromium major versions
assert.strictEqual(versions['10.0'], '85', 'electron 10.0 maps to chromium 85');
assert.strictEqual(versions['20.0'], '104', 'electron 20.0 maps to chromium 104');
assert.strictEqual(versions['30.0'], '124', 'electron 30.0 maps to chromium 124');
assert.strictEqual(versions['33.0'], '130', 'electron 33.0 maps to chromium 130');
assert.strictEqual(getChromiumVersion('33.0'), '130', 'helper getChromiumVersion resolves 33.0');

// 4. versions returns undefined for unmapped or non-existent Electron versions
assert.strictEqual(versions['999.0'], undefined, 'non-existent version returns undefined');
assert.strictEqual(versions['invalid-version'], undefined, 'invalid version key returns undefined');
assert.strictEqual(getChromiumVersion('999.0'), undefined, 'helper returns undefined for non-existent version');
assert.strictEqual(getChromiumVersion(null), undefined, 'helper returns undefined for non-string input');
assert.strictEqual(getChromiumVersion(123), undefined, 'helper returns undefined for numeric input');

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