The method fs.openSync() provided by the fs built-in module is the best way.

It returns a file descriptor:

const fs = require('fs')
const filePath = './.data/initialized'

const fd = fs.openSync(filePath, 'w')

the w flag makes sure the file is created if not existing, and if the file exists it overwrites it with a new file, overriding its content.

Use the a flag to avoid overwriting. The file is still created if not existing.

If you don’t need the file descriptor, you can wrap the call in a fs.closeSync() call, to close the file:

const fs = require('fs')
const filePath = './.data/initialized'

fs.closeSync(fs.openSync(filePath, 'w'))