Set Windows file attribute hidden using Firefox SDK API

gistfile1.js

/**
 * Sets the hidden file attribute of a file
 * @param {String} filepath String holding the path of the file to hide
 * @returns {Boolean} true if file attribute hidden is set, else false
 */
function setWindowsFileAttributeHidden(filepath) {
  const FILE_ATTRIBUTE_HIDDEN = 0x00000002;

  try {
    chrome.Cu.import('resource://gre/modules/ctypes.jsm');
    let lib = ctypes.open('kernel32.dll');
    
    try {
      let getFileAttributes = lib.declare('GetFileAttributesW', ctypes.winapi_abi, ctypes.uint32_t, ctypes.jschar.ptr);
      let setFileAttributes = lib.declare('SetFileAttributesW', ctypes.winapi_abi, ctypes.bool, ctypes.jschar.ptr, ctypes.uint32_t);
    
      let currentFileAttributes = getFileAttributes(filepath);
    
      if ((currentFileAttributes & FILE_ATTRIBUTE_HIDDEN) !== FILE_ATTRIBUTE_HIDDEN) {
        return setFileAttributes(filepath, currentFileAttributes | FILE_ATTRIBUTE_HIDDEN);
      } else {
        return true;
      }
    } finally {
      lib.close();
    }
  } catch (e) {
    // Error could be handled here
  }
  
  return false;
}