async-exit-hook 2.0.1: forceExitTimeout

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 async-exit-hook.forceExitTimeout in pkg:npm/async-exit-hook@2.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/async-exit-hook@2.0.1
Demonstrate these symbols/APIs:
  - async-exit-hook.forceExitTimeout

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:a98c16998da1838f6e1909d928422f490c2a55615b75e3b8a87f526548fb13ba","contract":["assert forceExitTimeout is a function exported by async-exit-hook","assert setForceExitTimeout executes without throwing","assert async exit hook that hangs is forcibly terminated after forceExitTimeout milliseconds","assert async exit hook that completes before forceExitTimeout exits normally before timeout","assert uncaught exception with async hook forces exit when timeout is reached"],"goal":"verify async-exit-hook.forceExitTimeout in pkg:npm/async-exit-hook@2.0.1","kind":"HOW","packages":["pkg:npm/async-exit-hook@2.0.1"],"schemaVersion":1,"symbols":["async-exit-hook.forceExitTimeout"]},"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/async-exit-hook@2.0.1"],"schemaVersion":1,"subject":"pkg:npm/async-exit-hook@2.0.1","symbols":["async-exit-hook.forceExitTimeout"],"verifierAdapter":"node-typescript@1"}

'use strict';

const exitHook = require('async-exit-hook');

/**
 * Configure the forced exit timeout for asynchronous exit hooks.
 * @param {number} ms - Timeout in milliseconds.
 */
function setForceExitTimeout(ms) {
  exitHook.forceExitTimeout(ms);
}

/**
 * Register an exit hook (synchronous or asynchronous).
 * @param {Function} hook - Hook function.
 */
function registerExitHook(hook) {
  exitHook(hook);
}

module.exports = {
  exitHook,
  setForceExitTimeout,
  registerExitHook,
  forceExitTimeout: exitHook.forceExitTimeout,
  uncaughtExceptionHandler: exitHook.uncaughtExceptionHandler,
  unhandledRejectionHandler: exitHook.unhandledRejectionHandler,
};

{
  "name": "sample-async-exit-hook",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-async-exit-hook",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "async-exit-hook": "2.0.1"
      }
    },
    "node_modules/async-exit-hook": {
      "version": "2.0.1",
      "resolved": "https://registry.npmjs.org/async-exit-hook/-/async-exit-hook-2.0.1.tgz",
      "integrity": "sha512-NW2cX8m1Q7KPA7a5M2ULQeZ2wR5qI5PAbw5L0UOMxdioVk9PMZ0h1TmyZEkPYrCvYjDlFICusOu1dlEKAAeXBw==",
      "license": "MIT",
      "engines": {
        "node": ">=0.12.0"
      }
    }
  }
}

{
  "name": "sample-async-exit-hook",
  "version": "1.0.0",
  "description": "Clean-room sample verifying async-exit-hook.forceExitTimeout in async-exit-hook",
  "main": "index.js",
  "license": "MIT-0",
  "dependencies": {
    "async-exit-hook": "2.0.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify async-exit-hook.forceExitTimeout in pkg:npm/async-exit-hook@2.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/async-exit-hook@2.0.1"
  ],
  "symbols": [
    "async-exit-hook.forceExitTimeout"
  ]
}

import assert from 'node:assert';
import { execFileSync } from 'node:child_process';
import exitHook from 'async-exit-hook';
import {
  exitHook as importedHook,
  forceExitTimeout,
  setForceExitTimeout,
  registerExitHook,
} from '../index.js';

// 1. assert forceExitTimeout is a function exported by async-exit-hook
assert.strictEqual(typeof exitHook.forceExitTimeout, 'function', 'exitHook.forceExitTimeout must be a function');
assert.strictEqual(typeof forceExitTimeout, 'function', 'forceExitTimeout exported by index.js must be a function');
assert.strictEqual(typeof setForceExitTimeout, 'function', 'setForceExitTimeout must be a function');
assert.strictEqual(typeof registerExitHook, 'function', 'registerExitHook must be a function');
assert.strictEqual(importedHook, exitHook, 'imported hook must match default export');

// 2. assert setForceExitTimeout executes without throwing
assert.doesNotThrow(() => {
  setForceExitTimeout(5000);
}, 'setForceExitTimeout(5000) should execute without error');
assert.doesNotThrow(() => {
  exitHook.forceExitTimeout(10000);
}, 'exitHook.forceExitTimeout(10000) should execute without error');

// 3. assert async exit hook that hangs is forcibly terminated after forceExitTimeout milliseconds
const hangChildCode = `
  const exitHook = require('async-exit-hook');
  exitHook.forceExitTimeout(300);
  exitHook((done) => {
    // Intentionally never call done()
    console.log('HOOK_STARTED');
  });
`;

const startTimeHang = Date.now();
const stdoutHang = execFileSync(process.execPath, ['-e', hangChildCode], {
  encoding: 'utf8',
  timeout: 5000,
});
const elapsedHang = Date.now() - startTimeHang;

assert.match(stdoutHang, /HOOK_STARTED/, 'Child process must run the async hook');
assert.ok(elapsedHang >= 250, `Child process should wait at least forceExitTimeout ms (elapsed: ${elapsedHang}ms)`);
assert.ok(elapsedHang < 2500, `Child process should force exit well before default 10s timeout (elapsed: ${elapsedHang}ms)`);

// 4. assert async exit hook that completes before forceExitTimeout exits normally before timeout
const normalChildCode = `
  const exitHook = require('async-exit-hook');
  exitHook.forceExitTimeout(5000);
  exitHook((done) => {
    setTimeout(() => {
      console.log('HOOK_DONE');
      done();
    }, 50);
  });
`;

const startTimeNormal = Date.now();
const stdoutNormal = execFileSync(process.execPath, ['-e', normalChildCode], {
  encoding: 'utf8',
  timeout: 5000,
});
const elapsedNormal = Date.now() - startTimeNormal;

assert.match(stdoutNormal, /HOOK_DONE/, 'Child process must complete the async hook');
assert.ok(elapsedNormal < 2000, `Child process should exit quickly after done() without waiting for full timeout (elapsed: ${elapsedNormal}ms)`);

// 5. assert uncaught exception with async hook forces exit when timeout is reached
const uncaughtChildCode = `
  const exitHook = require('async-exit-hook');
  exitHook.forceExitTimeout(300);
  exitHook.uncaughtExceptionHandler((err, done) => {
    console.log('CAUGHT_EXCEPTION:' + err.message);
    // Intentionally never call done()
  });
  throw new Error('test-uncaught');
`;

let uncaughtThrown = false;
const startTimeUncaught = Date.now();
try {
  execFileSync(process.execPath, ['-e', uncaughtChildCode], {
    encoding: 'utf8',
    timeout: 5000,
  });
} catch (err) {
  uncaughtThrown = true;
  const elapsedUncaught = Date.now() - startTimeUncaught;
  assert.strictEqual(err.status, 1, 'Process with uncaught exception should exit with code 1');
  assert.match(err.stdout || '', /CAUGHT_EXCEPTION:test-uncaught/, 'Uncaught exception handler should receive the error');
  assert.ok(elapsedUncaught >= 250, `Uncaught handler should wait at least forceExitTimeout ms (elapsed: ${elapsedUncaught}ms)`);
  assert.ok(elapsedUncaught < 2500, `Uncaught handler should force exit well before default 10s (elapsed: ${elapsedUncaught}ms)`);
}
assert.strictEqual(uncaughtThrown, true, 'execFileSync should exit with non-zero for uncaught exception');

console.log('All async-exit-hook.forceExitTimeout contract assertions passed.');