A library for managing graceful shutdowns of Node.js processes by handling cleanup operations, including terminating child processes.
A library for managing graceful shutdowns of Node.js processes by handling cleanup operations, including terminating child processes.
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To install @push.rocks/smartexit, use pnpm:
``bash`
pnpm install @push.rocks/smartexit
@push.rocks/smartexit helps you gracefully shut down Node.js applications by running cleanup operations before the process exits. It handles signal interception (SIGINT, SIGTERM), uncaught exception management, and child process termination.
`typescript
import { SmartExit } from '@push.rocks/smartexit';
// Create an instance - this automatically hooks into process signals
const smartExit = new SmartExit();
`
Define custom async cleanup functions that execute before the process exits:
`typescript
smartExit.addCleanupFunction(async () => {
console.log('Closing database connections...');
await database.close();
});
smartExit.addCleanupFunction(async () => {
console.log('Flushing logs...');
await logger.flush();
});
`
Track spawned child processes so they get properly terminated on exit:
`typescript
import { spawn } from 'child_process';
const childProcess = spawn('node', ['worker.js']);
smartExit.addProcess(childProcess);
// Remove from tracking if the process ends naturally
childProcess.on('exit', () => {
smartExit.removeProcess(childProcess);
});
`
Terminate an entire process tree using the static killTreeByPid method:
`typescript
import { SmartExit, type TProcessSignal } from '@push.rocks/smartexit';
// Kill with default SIGKILL
await SmartExit.killTreeByPid(12345);
// Kill with a specific signal
await SmartExit.killTreeByPid(12345, 'SIGTERM');
`
While SmartExit automatically hooks into SIGINT, SIGTERM, and uncaught exceptions, you can manually trigger cleanup:
`typescript`
await smartExit.killAll();
process.exit(0);
Gracefully close an Express server on shutdown:
`typescript
import express from 'express';
import { SmartExit } from '@push.rocks/smartexit';
const app = express();
const smartExit = new SmartExit();
const server = app.listen(3000, () => {
console.log('Server running on port 3000');
});
smartExit.addCleanupFunction(async () => {
console.log('Closing Express server...');
await new Promise
});
`
The TProcessSignal type provides all standard POSIX signals:
`typescript
import type { TProcessSignal } from '@push.rocks/smartexit';
// Examples: 'SIGINT', 'SIGTERM', 'SIGKILL', 'SIGHUP', 'SIGUSR1', 'SIGUSR2', etc.
`
When you create a SmartExit instance, it automatically:
1. Hooks SIGINT (Ctrl+C): Runs cleanup and exits with code 0
2. Hooks process exit: Runs cleanup when process.exit(0) is called
3. Catches uncaught exceptions: Logs the error, runs cleanup, and exits with code 1
On killAll(), it:SIGINT
- Sends to all tracked child processesSIGKILL` if processes are still alive
- Waits 10 seconds, then sends
- Executes all registered cleanup functions
This repository contains open-source code licensed under the MIT License. A copy of the license can be found in the LICENSE file.
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