process-nextick-args 2.0.1: nextTick

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 process-nextick-args.nextTick in pkg:npm/process-nextick-args@2.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/process-nextick-args@2.0.1
Demonstrate these symbols/APIs:
  - process-nextick-args.nextTick
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:sha256:5729fc527808e7a0e48bf027b4f5401cf5a8f097f84f1c4c1e1b9398df42b046","constraints":{"executionContext":"node"},"contract":["nextTick schedules callback execution asynchronously on next event loop tick","nextTick forwards single argument to scheduled callback","nextTick forwards multiple arguments of different types to scheduled callback","nextTick executes multiple scheduled callbacks in first-in first-out order","nextTick throws TypeError when callback argument is not a function"],"goal":"verify process-nextick-args.nextTick in pkg:npm/process-nextick-args@2.0.1","kind":"HOW","packages":["pkg:npm/process-nextick-args@2.0.1"],"schemaVersion":1,"symbols":["process-nextick-args.nextTick"]},"contractCommand":["node","test/contract.mjs"],"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/process-nextick-args@2.0.1"],"schemaVersion":1,"subject":"pkg:npm/process-nextick-args@2.0.1","symbols":["process-nextick-args.nextTick"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-process-nextick-args",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-process-nextick-args",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "process-nextick-args": "2.0.1"
      }
    },
    "node_modules/process-nextick-args": {
      "version": "2.0.1",
      "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
      "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag==",
      "license": "MIT"
    }
  }
}

{
  "name": "sample-process-nextick-args",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room code sample for process-nextick-args nextTick",
  "main": "src/index.js",
  "license": "MIT-0",
  "dependencies": {
    "process-nextick-args": "2.0.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify process-nextick-args.nextTick in pkg:npm/process-nextick-args@2.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/process-nextick-args@2.0.1"
  ],
  "symbols": [
    "process-nextick-args.nextTick"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

const processNextickArgs = require('process-nextick-args');

/**
 * Schedules callback execution on the next event loop tick with forwarded arguments.
 *
 * @param {Function} fn - Callback function to invoke.
 * @param {...any} args - Arguments to pass to callback.
 */
function scheduleTick(fn, ...args) {
  return processNextickArgs.nextTick(fn, ...args);
}

module.exports = {
  nextTick: processNextickArgs.nextTick,
  scheduleTick
};

import assert from 'node:assert/strict';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const { nextTick, scheduleTick } = require('../src/index.js');

async function runTests() {
  // 1. nextTick schedules callback execution asynchronously on next event loop tick
  await new Promise((resolve, reject) => {
    let executed = false;
    nextTick(() => {
      try {
        executed = true;
        resolve();
      } catch (err) {
        reject(err);
      }
    });
    assert.strictEqual(executed, false, 'Callback should not execute synchronously');
  });

  // 2. nextTick forwards single argument to scheduled callback
  await new Promise((resolve, reject) => {
    scheduleTick((arg) => {
      try {
        assert.strictEqual(arg, 'test-value');
        resolve();
      } catch (err) {
        reject(err);
      }
    }, 'test-value');
  });

  // 3. nextTick forwards multiple arguments of different types to scheduled callback
  await new Promise((resolve, reject) => {
    const payload = { key: 'value' };
    nextTick(
      (a, b, c, d) => {
        try {
          assert.strictEqual(a, 42);
          assert.strictEqual(b, 'hello');
          assert.strictEqual(c, true);
          assert.deepStrictEqual(d, payload);
          resolve();
        } catch (err) {
          reject(err);
        }
      },
      42,
      'hello',
      true,
      payload
    );
  });

  // 4. nextTick executes multiple scheduled callbacks in first-in first-out order
  await new Promise((resolve, reject) => {
    const order = [];
    nextTick(() => order.push(1));
    nextTick(() => order.push(2));
    nextTick(() => {
      try {
        order.push(3);
        assert.deepStrictEqual(order, [1, 2, 3]);
        resolve();
      } catch (err) {
        reject(err);
      }
    });
  });

  // 5. nextTick throws TypeError when callback argument is not a function
  assert.throws(
    () => nextTick(null),
    (err) => err instanceof TypeError
  );
  assert.throws(
    () => nextTick(undefined),
    (err) => err instanceof TypeError
  );
  assert.throws(
    () => nextTick('invalid'),
    (err) => err instanceof TypeError
  );

  console.log('All contract assertions for process-nextick-args.nextTick passed.');
}

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