Why node js is not creating new file again after deleting it

Question

I wrote a Node js program with the following steps -

• Check if file ~/temp.txt exists
• If not create new file
• Write some content into the file

const http = require('http');

const hostname = '127.0.0.1';
const port = 3000;

const server = http.createServer((req, res) => {

  const homedir = os.homedir();

  if (fs.existsSync(`${homedir}/temp.txt`)) {
  } else {
    fs.writeFile(`${homedir}/temp.txt`, '', { flag: 'wx' }, function (err) {});
  }

  // writing some content to the file
  // ...

  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello World');
}

When I am running curl localhost:3000 -

• First, it did not find any file. So it created new file and write content as expected
• Now I deleted the file manually and hit the curl command again
• Now it identified file does not exist, but not creating new one.

I am unable to understand why it is creating the file successfully for the first time and not creating after deleting it manually.