anchor.diff:  call npm install
   if errorlevel 1 goto linking-failed
   rmdir "%SHIELDBATTERY_PATH%\js"
  -mklink /D "%SHIELDBATTERY_PATH%\js" "%~dp0\js"
  +mklink /D "%SHIELDBATTERY_PATH%\js" "%scriptroot%\js"
   echo JS modules linked.
   goto exit
   
  
positive.code: goto exit
  
  :exit
  cd "%~dp0"
  goto :EOF
  
negative.code: 
  echo Warning: ignoring invalid command line option `%1`.
  
  :arg-ok
  shift
  goto next-arg
  