electron-to-chromium 1.5.412: chromiumToElectron

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 chromiumToElectron 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:
  - chromiumToElectron
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:be78cfdc77e18efb9dbcf1fe9bbce95e15ff870ce0b5ee489f13749bf64cc5be","constraints":{"executionContext":"node"},"contract":["chromiumToElectron maps major chromium version string to corresponding electron version","chromiumToElectron accepts numeric major chromium version and converts to electron version","chromiumToElectron maps full chromium version string to list of matching electron versions","chromiumToElectron returns undefined for unknown major chromium version","chromiumToElectron returns undefined for unknown full chromium version"],"goal":"verify chromiumToElectron in pkg:npm/electron-to-chromium@1.5.412","kind":"HOW","packages":["pkg:npm/electron-to-chromium@1.5.412"],"schemaVersion":1,"symbols":["chromiumToElectron"]},"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":["chromiumToElectron"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-electron-to-chromium",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-electron-to-chromium",
      "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",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification sample for chromiumToElectron in electron-to-chromium",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "electron-to-chromium": "1.5.412"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify chromiumToElectron in pkg:npm/electron-to-chromium@1.5.412",
  "kind": "HOW",
  "packages": [
    "pkg:npm/electron-to-chromium@1.5.412"
  ],
  "symbols": [
    "chromiumToElectron"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

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

/**
 * Resolves the Electron version corresponding to a Chromium version.
 * @param {string|number} chromiumVersion Major version (e.g. '54' or 54) or full version string (e.g. '39.0.2171.65')
 * @returns {string|string[]|undefined} Corresponding Electron version string, array of versions, or undefined
 */
function resolveElectronVersion(chromiumVersion) {
  return chromiumToElectron(chromiumVersion);
}

module.exports = {
  resolveElectronVersion,
  chromiumToElectron
};

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

// Verify export
assert.strictEqual(chromiumToElectron, rawEtc.chromiumToElectron, 'chromiumToElectron should be exported correctly');

// 1. chromiumToElectron maps major chromium version string to corresponding electron version
assert.strictEqual(chromiumToElectron('54'), '1.4', 'chromium 54 maps to electron 1.4');
assert.strictEqual(chromiumToElectron('80'), '8.0', 'chromium 80 maps to electron 8.0');
assert.strictEqual(chromiumToElectron('100'), '18.0', 'chromium 100 maps to electron 18.0');
assert.strictEqual(chromiumToElectron('120'), '28.0', 'chromium 120 maps to electron 28.0');
assert.strictEqual(chromiumToElectron('130'), '33.0', 'chromium 130 maps to electron 33.0');
assert.strictEqual(resolveElectronVersion('54'), '1.4', 'helper resolveElectronVersion maps chromium 54 to electron 1.4');

// 2. chromiumToElectron accepts numeric major chromium version and converts to electron version
assert.strictEqual(chromiumToElectron(54), '1.4', 'numeric chromium 54 maps to electron 1.4');
assert.strictEqual(chromiumToElectron(80), '8.0', 'numeric chromium 80 maps to electron 8.0');
assert.strictEqual(chromiumToElectron(100), '18.0', 'numeric chromium 100 maps to electron 18.0');
assert.strictEqual(chromiumToElectron(130), '33.0', 'numeric chromium 130 maps to electron 33.0');
assert.strictEqual(resolveElectronVersion(130), '33.0', 'helper resolveElectronVersion maps numeric chromium 130 to electron 33.0');

// 3. chromiumToElectron maps full chromium version string to list of matching electron versions
const electronVersions39 = chromiumToElectron('39.0.2171.65');
assert.ok(Array.isArray(electronVersions39), 'full chromium version returns an array');
assert.deepStrictEqual(
  electronVersions39,
  ['0.20.0', '0.20.1', '0.20.2', '0.20.3', '0.20.4', '0.20.5', '0.20.6', '0.20.7', '0.20.8'],
  'matching full electron versions for 39.0.2171.65'
);
assert.deepStrictEqual(
  resolveElectronVersion('40.0.2214.91'),
  ['0.21.0', '0.21.1', '0.21.2'],
  'helper resolveElectronVersion returns matching full versions for 40.0.2214.91'
);

// 4. chromiumToElectron returns undefined for unknown major chromium version
assert.strictEqual(chromiumToElectron('9999'), undefined, 'unknown string major version returns undefined');
assert.strictEqual(chromiumToElectron(9999), undefined, 'unknown numeric major version returns undefined');
assert.strictEqual(chromiumToElectron('non-existent'), undefined, 'invalid string returns undefined');
assert.strictEqual(resolveElectronVersion('9999'), undefined, 'helper resolveElectronVersion returns undefined for unknown');

// 5. chromiumToElectron returns undefined for unknown full chromium version
assert.strictEqual(chromiumToElectron('999.0.0.0'), undefined, 'unknown full version returns undefined');
assert.strictEqual(resolveElectronVersion('999.0.0.0'), undefined, 'helper resolveElectronVersion returns undefined for unknown full');

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