universalify 0.1.2

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/universalify@0.1.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/universalify@0.1.2
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:sha256:473bddac776163c93a8bffba5abcaaa987cb6155215c404a71c11f6894dcf3c1","constraints":{"executionContext":"node"},"contract":["fromCallback wraps a callback-taking function so it accepts a callback or returns a Promise","fromCallback propagates errors to both callback and rejected Promise","fromPromise wraps a promise-returning function so it accepts a callback or returns a Promise","fromPromise propagates errors to both callback and rejected Promise"],"goal":"verify pkg:npm/universalify@0.1.2","kind":"HOW","packages":["pkg:npm/universalify@0.1.2"],"schemaVersion":1},"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/universalify@0.1.2"],"schemaVersion":1,"subject":"pkg:npm/universalify@0.1.2","verifierAdapter":"node-typescript@1"}

{
  "name": "sample-universalify",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-universalify",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "universalify": "0.1.2"
      }
    },
    "node_modules/universalify": {
      "version": "0.1.2",
      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
      "license": "MIT",
      "engines": {
        "node": ">= 4.0.0"
      }
    }
  }
}

{
  "name": "sample-universalify",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification sample for universalify",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "universalify": "0.1.2"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/universalify@0.1.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/universalify@0.1.2"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

const universalify = require('universalify');

function callbackFn(value, callback) {
  setTimeout(() => {
    if (value === 'error') {
      callback(new Error('callback failed'));
    } else {
      callback(null, `callback:${value}`);
    }
  }, 5);
}

function promiseFn(value) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      if (value === 'error') {
        reject(new Error('promise failed'));
      } else {
        resolve(`promise:${value}`);
      }
    }, 5);
  });
}

const universalCallback = universalify.fromCallback(callbackFn);
const universalPromise = universalify.fromPromise(promiseFn);

module.exports = {
  universalCallback,
  universalPromise
};

const assert = require('node:assert');
const universalify = require('universalify');
const { universalCallback, universalPromise } = require('../src/index.js');

async function runTests() {
  // 1. fromCallback with callback on success
  await new Promise((resolve, reject) => {
    universalCallback('hello', (err, res) => {
      if (err) return reject(err);
      try {
        assert.strictEqual(res, 'callback:hello');
        resolve();
      } catch (e) {
        reject(e);
      }
    });
  });

  // 2. fromCallback with callback on error
  await new Promise((resolve, reject) => {
    universalCallback('error', (err, res) => {
      try {
        assert(err instanceof Error);
        assert.strictEqual(err.message, 'callback failed');
        assert.strictEqual(res, undefined);
        resolve();
      } catch (e) {
        reject(e);
      }
    });
  });

  // 3. fromCallback without callback returns Promise (resolve)
  const resCbPromise = await universalCallback('world');
  assert.strictEqual(resCbPromise, 'callback:world');

  // 4. fromCallback without callback returns Promise (reject)
  await assert.rejects(
    async () => {
      await universalCallback('error');
    },
    {
      name: 'Error',
      message: 'callback failed'
    }
  );

  // 5. fromPromise with callback on success
  await new Promise((resolve, reject) => {
    universalPromise('hello', (err, res) => {
      if (err) return reject(err);
      try {
        assert.strictEqual(res, 'promise:hello');
        resolve();
      } catch (e) {
        reject(e);
      }
    });
  });

  // 6. fromPromise with callback on error
  await new Promise((resolve, reject) => {
    universalPromise('error', (err, res) => {
      try {
        assert(err instanceof Error);
        assert.strictEqual(err.message, 'promise failed');
        assert.strictEqual(res, undefined);
        resolve();
      } catch (e) {
        reject(e);
      }
    });
  });

  // 7. fromPromise without callback returns Promise (resolve)
  const resPromPromise = await universalPromise('world');
  assert.strictEqual(resPromPromise, 'promise:world');

  // 8. fromPromise without callback returns Promise (reject)
  await assert.rejects(
    async () => {
      await universalPromise('error');
    },
    {
      name: 'Error',
      message: 'promise failed'
    }
  );

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

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