How to touch a file in Node.js: https://remarkablemark.org/blog/2017/12/17/touch-file-nodejs/

touch-callback.js

// callback
const { close, open, utimes } = require('fs');

const touch = (path, callback) => {
  const time = new Date();
  utimes(path, time, time, err => {
    if (err) {
      return open(path, 'w', (err, fd) => {
        err ? callback(err) : close(fd, callback);
      });
    }
    callback();
  });
};

// usage
const filename = 'file.txt';
touch(filename, err => {
  if (err) throw err;
  console.log(`touch ${filename}`);
});

touch-promise.js

// promise
const { close, open, utimes } = require('fs');

const touch = path => {
  return new Promise((resolve, reject) => {
    const time = new Date();
    utimes(path, time, time, err => {
      if (err) {
        return open(path, 'w', (err, fd) => {
          if (err) return reject(err);
          close(fd, err => (err ? reject(err) : resolve(fd)));
        });
      }
      resolve();
    });
  });
};

// usage
const filename = 'file.txt';
touch(filename)
  .then(fd => console.log(`touch ${filename}`))
  .catch(err => {
    throw err;
  });

touch-sync.js

// sync
const { closeSync, openSync, utimesSync } = require('fs');

const touch = path => {
  const time = new Date();
  try {
    utimesSync(path, time, time);
  } catch (err) {
    closeSync(openSync(path, 'w'));
  }
}

// usage
const filename = 'file.txt';
touch(filename);
console.log(`touch ${filename}`);

can I use these in my project? What license are they published under?

You have my permission to use this in your project (credit is appreciated). Although the code is unlicensed, you can treat it as MIT:

The MIT License

Copyright (c) 2017 Menglin "Mark" Xu <mark@remarkablemark.org>

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.