docs: function safeWriteFileSync (fileName, data, options) {
      verifyFileName (fileName);
      
      // if fileName exists, verify it is a file
      var info = getFileInfo (fileName);
      if ((info.exists) && (info.isFile === false)) {
          var message = format (cc.MSG_IS_NOT_A_FILE, fileName);
          throw new SafeFileError (cc.IS_NOT_A_FILE, message);
      }
  
      // get current file system state, and auto-recover if necessary
      var state = getState (fileName);
  
      // store data in well defined ephemeral file to allow manual recovery
      // If file already exists, remove it (failed prior recovery).
      if (state.ephemeral.exists) {
          fs.unlinkSync (state.ephemeral.name);
      }
  
      writeFileSync (state.ephemeral.name, data, options);
      state.ephemeral.exists = true;
  
      // if ready state file already exists, recover prior state
      if (state.ready.exists) {
          performRecovery (state, false);
      }
      
      fs.renameSync (state.ephemeral.name, state.ready.name);
  
      // refresh state and process recovery to set file system state
      state = getState (fileName);
      performRecovery (state, true);
  }