Exposes a synchronous if (!fs.existsSync(...)) check around an
fs.writeFileSync or fs.mkdirSync call, depending on whether filetouch.dir
or filetouch.file is called.
Files are not modified if they already exist.
const filetouch = require('filetouch');
// create test.txt if doesn't exist
filetouch.file('test.txt');
// create test2.txt and write into it, if doesn't exist
filetouch.file('test2.txt', 'test text goes here');
// create test3 directory if doesn't exist
filetouch.dir('test3');