如何从 npm 脚本优雅地停止 NodeJS 进程

Question

I've a scenario to run cypress E2E test and for which , I need NodeJS application to be up. So, I'm using wait-on library and i'm able to run the cypress E2E test but it leaves my NodeJS application running in background.

I want to end the NodeJS process running in background as part of my cypress:e2e npm script.

---

Question : How can I send SIGINT signal from npm script because in my server.ts , I'm exiting the process with SIGINT . (no ctrl+c would help)

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server.ts :

/****************************/
/* Start Up The Node Server */
/****************************/
APP.listen(PORT, () => {
  logger.info(
    `Node application has started their node server on port ${PORT}`,
  )
})

process.on('SIGINT', () => process.exit(1))

npm scripts:

{
    "start": "node dist/server",
    "test:e2e": "ng e2e",
    "stop": ""
    "cypress:e2e": "npm run start & wait-on http://localhost:8080 && npm run test:e2e && npm run stop"
}

Please help to write npm script "stop" .

Better solutions or approaches would be appreciated.

---

Solutions tried:

"stop": "kill -SIGINT %1"

I still have the process running :

Answer 1

There are several ways to do this.

Use pkill :

pkill -SIGINT -f server.ts

This way, you do not need to know the PID of the process. However, this will send a signal to all processes that have "server.ts" in the command line.

Use a pidfile

In server.ts , write process.pid to a pidfile, for example server.pid . Then use the pidfile to send a signal.

pkill -SIGINT --pidfile server.pid

This can also be done from Node.js with process.kill() .

You should remove the pidfile when the server process exits.

Use an endpoint

In server.ts add a route to shutdown the server.

app.post('/shutdown', (req, res) => {
  res.sendStatus(200);
  process.exit(0);
});

Then send a request to this endpoint at the end of the e2e tests or from the command line with curl .

You should probably only enable this endpoint in development and not in production.