CodeSampleX

Sample

@electron/universal 2.0.1: makeUniversalApp

Verified sample for npm @electron/universal 2.0.1: makeUniversalApp. The contract ran on node 22 · linux alpine/x64 · docker and passed.

sha256:450fcc8627be52dd907e95ad42377e8a7947fa72f2ac7bd53f7b1d27db04aa54

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 linux 24 · ubuntu · glibc 2.39 x64 npm

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-27

Case

HOW
Goal
verify pkg:npm/%40electron/universal@2.0.1
Packages
Symbols
  • makeUniversalApp
Created
2026-08-27T17:22:01Z

Contract

  1. makeUniversalApp rejects with an Error on non-darwin platforms indicating darwin support requirement
  2. makeUniversalApp validates that x64AppPath is an absolute path
  3. makeUniversalApp validates that arm64AppPath is an absolute path
  4. makeUniversalApp validates that outAppPath is an absolute path
  5. makeUniversalApp rejects when outAppPath already exists and force option is not true
  6. makeUniversalApp rejects when asar settings differ between x64 and arm64 applications

Files

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

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 pkg:npm/%40electron/universal@2.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40electron/universal@2.0.1
Demonstrate these symbols/APIs:
  - makeUniversalApp

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:sha256:0839b16561d496d423d2d09fb95c7421c0c8afdd7ac70d04aa3d25245261ad42","contract":["makeUniversalApp rejects with an Error on non-darwin platforms indicating darwin support requirement","makeUniversalApp validates that x64AppPath is an absolute path","makeUniversalApp validates that arm64AppPath is an absolute path","makeUniversalApp validates that outAppPath is an absolute path","makeUniversalApp rejects when outAppPath already exists and force option is not true","makeUniversalApp rejects when asar settings differ between x64 and arm64 applications"],"goal":"verify pkg:npm/%40electron/universal@2.0.1","kind":"HOW","packages":["pkg:npm/%40electron/universal@2.0.1"],"schemaVersion":1,"symbols":["makeUniversalApp"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40electron/universal@2.0.1"],"schemaVersion":1,"subject":"pkg:npm/%40electron/universal@2.0.1","symbols":["makeUniversalApp"],"verifierAdapter":"node-typescript@1"}
index.js
import { makeUniversalApp } from '@electron/universal';

/**
 * Creates a universal macOS application binary from x64 and arm64 builds.
 * @param {import('@electron/universal').MakeUniversalOpts} options
 * @returns {Promise<void>}
 */
export async function createUniversalApp(options) {
  return await makeUniversalApp(options);
}

export { makeUniversalApp };
package-lock.json
{
  "name": "sample-electron-universal",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
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    "": {
      "name": "sample-electron-universal",
      "version": "1.0.0",
      "dependencies": {
        "@electron/universal": "2.0.1"
      }
    },
    "node_modules/@electron/asar": {
      "version": "3.4.1",
      "resolved": "https://registry.npmjs.org/@electron/asar/-/asar-3.4.1.tgz",
      "integrity": "sha512-i4/rNPRS84t0vSRa2HorerGRXWyF4vThfHesw0dmcWHp+cspK743UanA0suA5Q5y8kzY2y6YKrvbIUn69BCAiA==",
      "license": "MIT",
      "dependencies": {
        "commander": "^5.0.0",
        "glob": "^7.1.6",
        "minimatch": "^3.0.4"
      },
      "bin": {
        "asar": "bin/asar.js"
      },
      "engines": {
        "node": ">=10.12.0"
      }
    },
    "node_modules/@electron/asar/node_modules/brace-expansion": {
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        "concat-map": "0.0.1"
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      "license": "MIT",
      "dependencies": {
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        "base64-js": "^1.5.1",
        "xmlbuilder": "^15.1.1"
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      "license": "MIT",
      "engines": {
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    "node_modules/universalify": {
      "version": "2.0.1",
      "resolved": "https://registry.npmjs.org/universalify/-/universalify-2.0.1.tgz",
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}
package.json
{
  "name": "sample-electron-universal",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "@electron/universal": "2.0.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40electron/universal@2.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40electron/universal@2.0.1"
  ],
  "symbols": [
    "makeUniversalApp"
  ]
}
test/contract.mjs
import assert from 'node:assert/strict';
import path from 'node:path';
import fs from 'node:fs/promises';
import { fileURLToPath } from 'node:url';
import { makeUniversalApp, createUniversalApp } from '../index.js';

const __dirname = path.dirname(fileURLToPath(import.meta.url));

async function runTests() {
  const tempDir = path.resolve(__dirname, '.temp-test');
  await fs.rm(tempDir, { recursive: true, force: true });
  await fs.mkdir(tempDir, { recursive: true });

  const dummyX64 = path.resolve(tempDir, 'mock_x64.app');
  const dummyArm64 = path.resolve(tempDir, 'mock_arm64.app');
  const dummyOut = path.resolve(tempDir, 'mock_out.app');

  // 1. makeUniversalApp rejects with an Error on non-darwin platforms indicating darwin support requirement
  {
    const origPlatform = process.platform;
    try {
      Object.defineProperty(process, 'platform', { value: 'linux', configurable: true });
      await assert.rejects(
        async () => {
          await createUniversalApp({
            x64AppPath: dummyX64,
            arm64AppPath: dummyArm64,
            outAppPath: dummyOut,
          });
        },
        /only supported on darwin platforms/
      );
    } finally {
      Object.defineProperty(process, 'platform', { value: origPlatform, configurable: true });
    }
  }

  // Set darwin platform for validation tests
  const origPlatform = process.platform;
  Object.defineProperty(process, 'platform', { value: 'darwin', configurable: true });

  try {
    // 2. makeUniversalApp validates that x64AppPath is an absolute path
    {
      await assert.rejects(
        async () => {
          await makeUniversalApp({
            x64AppPath: path.join('relative', 'x64.app'),
            arm64AppPath: dummyArm64,
            outAppPath: dummyOut,
          });
        },
        /Expected opts\.x64AppPath to be an absolute path but it was not/
      );
    }

    // 3. makeUniversalApp validates that arm64AppPath is an absolute path
    {
      await assert.rejects(
        async () => {
          await makeUniversalApp({
            x64AppPath: dummyX64,
            arm64AppPath: path.join('relative', 'arm64.app'),
            outAppPath: dummyOut,
          });
        },
        /Expected opts\.arm64AppPath to be an absolute path but it was not/
      );
    }

    // 4. makeUniversalApp validates that outAppPath is an absolute path
    {
      await assert.rejects(
        async () => {
          await makeUniversalApp({
            x64AppPath: dummyX64,
            arm64AppPath: dummyArm64,
            outAppPath: path.join('relative', 'out.app'),
          });
        },
        /Expected opts\.outAppPath to be an absolute path but it was not/
      );
    }

    // 5. makeUniversalApp rejects when outAppPath already exists and force option is not true
    {
      const existingOut = path.resolve(tempDir, 'Existing.app');
      await fs.writeFile(existingOut, 'dummy');

      await assert.rejects(
        async () => {
          await makeUniversalApp({
            x64AppPath: path.resolve(tempDir, 'x64.app'),
            arm64AppPath: path.resolve(tempDir, 'arm64.app'),
            outAppPath: existingOut,
            force: false,
          });
        },
        /already exists and force is not set to true/
      );
    }

    // 6. makeUniversalApp rejects when asar settings differ between x64 and arm64 applications
    {
      const x64App = path.resolve(tempDir, 'x64_asar.app');
      const arm64App = path.resolve(tempDir, 'arm64_noasar.app');
      const outApp = path.resolve(tempDir, 'out_asar.app');

      await fs.mkdir(path.join(x64App, 'Contents', 'Resources'), { recursive: true });
      await fs.writeFile(path.join(x64App, 'Contents', 'Resources', 'app.asar'), 'asar data');

      await fs.mkdir(path.join(arm64App, 'Contents', 'Resources'), { recursive: true });

      await assert.rejects(
        async () => {
          await makeUniversalApp({
            x64AppPath: x64App,
            arm64AppPath: arm64App,
            outAppPath: outApp,
          });
        },
        /Both the x64 and arm64 versions of your application need to have been built with the same asar settings/
      );
    }
  } finally {
    Object.defineProperty(process, 'platform', { value: origPlatform, configurable: true });
    await fs.rm(tempDir, { recursive: true, force: true });
  }

  console.log('All contracts passed successfully.');
}

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

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