code: function touch(file) {
    if (!exists(file)) {
      write(file, '');
    }
    const now = new Date();
    setAttrs(file, {atime: now, mtime: now});
  }
docs: Touch file
  @function $file~touch
  @param {string} file - File to touch
  @example
  // Create a empty file '.initialized'
  $file.touch('.initialized');