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 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:
  - nextTick

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:sha256:4e50d0a37f6a09bba4534ddc648027bb7e48db23b520e12e15f06e47115b5beb","contract":["assert nextTick is exported as a callable function on process-nextick-args","assert nextTick schedules callback to run asynchronously on the next tick","assert nextTick forwards multiple arguments to the callback","assert nextTick preserves call execution order FIFO","assert nextTick throws TypeError when callback is not a function","assert wrapper nextTickPromise resolves with return value and forwarded arguments"],"goal":"verify pkg:npm/process-nextick-args@2.0.1","kind":"HOW","packages":["pkg:npm/process-nextick-args@2.0.1"],"schemaVersion":1,"symbols":["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":["nextTick"],"verifierAdapter":"node-typescript@1"}

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

function scheduleNextTick(callback, ...args) {
  pna.nextTick(callback, ...args);
}

function nextTickPromise(fn, ...args) {
  return new Promise((resolve, reject) => {
    try {
      pna.nextTick((...passedArgs) => {
        try {
          resolve(fn(...passedArgs));
        } catch (err) {
          reject(err);
        }
      }, ...args);
    } catch (err) {
      reject(err);
    }
  });
}

module.exports = {
  pna,
  nextTick: pna.nextTick,
  scheduleNextTick,
  nextTickPromise,
};

{
  "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",
  "description": "Minimal clean-room sample verifying process-nextick-args callback scheduling and argument forwarding",
  "main": "index.js",
  "license": "MIT-0",
  "dependencies": {
    "process-nextick-args": "2.0.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/process-nextick-args@2.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/process-nextick-args@2.0.1"
  ],
  "symbols": [
    "nextTick"
  ]
}

import assert from 'node:assert';
import pna from 'process-nextick-args';
import indexPkg from '../index.js';

const { scheduleNextTick, nextTickPromise } = indexPkg;

// 1. Export check
assert.strictEqual(typeof pna.nextTick, 'function', 'nextTick must be exported as a function');

// 2. Asynchronous execution on next tick
let syncFlag = false;
await new Promise((resolve) => {
  pna.nextTick(() => {
    assert.strictEqual(syncFlag, true, 'nextTick callback must execute asynchronously after synchronous code');
    resolve();
  });
  syncFlag = true;
});

// 3. Argument forwarding across various argument lengths
// 0 arguments
let zeroArgCalled = false;
await new Promise((resolve) => {
  pna.nextTick(() => {
    zeroArgCalled = true;
    resolve();
  });
});
assert.strictEqual(zeroArgCalled, true, '0-arg callback must be called');

// 1 argument
const singleArg = await new Promise((resolve) => {
  pna.nextTick((val) => resolve(val), 'first-arg');
});
assert.strictEqual(singleArg, 'first-arg', 'single argument must be forwarded correctly');

// 2 arguments
const twoArgs = await new Promise((resolve) => {
  pna.nextTick((a, b) => resolve({ a, b }), 'foo', 123);
});
assert.deepStrictEqual(twoArgs, { a: 'foo', b: 123 }, 'two arguments must be forwarded correctly');

// 3 arguments
const threeArgs = await new Promise((resolve) => {
  pna.nextTick((a, b, c) => resolve([a, b, c]), 1, 2, 3);
});
assert.deepStrictEqual(threeArgs, [1, 2, 3], 'three arguments must be forwarded correctly');

// 4 or more arguments
const fiveArgs = await new Promise((resolve) => {
  pna.nextTick((...args) => resolve(args), 'a', 'b', 'c', 'd', 'e');
});
assert.deepStrictEqual(fiveArgs, ['a', 'b', 'c', 'd', 'e'], 'multiple arguments must be forwarded correctly');

// 4. Execution order (FIFO)
const order = [];
await new Promise((resolve) => {
  scheduleNextTick(() => order.push(1));
  scheduleNextTick(() => order.push(2));
  scheduleNextTick(() => {
    order.push(3);
    resolve();
  });
});
assert.deepStrictEqual(order, [1, 2, 3], 'nextTick callbacks must execute in FIFO order');

// 5. Throws TypeError when callback is not a function
assert.throws(
  () => {
    pna.nextTick(null);
  },
  {
    name: 'TypeError',
  },
  'nextTick must throw TypeError when callback is null'
);

assert.throws(
  () => {
    pna.nextTick('invalid');
  },
  {
    name: 'TypeError',
  },
  'nextTick must throw TypeError when callback is a string'
);

// 6. Wrapper nextTickPromise resolves with returned value and arguments
const promiseSum = await nextTickPromise((x, y) => x + y, 100, 200);
assert.strictEqual(promiseSum, 300, 'nextTickPromise must resolve with the return value');

const promiseReject = await nextTickPromise(() => {
  throw new Error('custom-error');
}).catch((err) => err);
assert.strictEqual(promiseReject.message, 'custom-error', 'nextTickPromise must catch and reject errors');

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