npm install exceljs
npm WARN deprecated graceful-fs@3.0.8: graceful-fs version 3 and before will fail on newer node releases. Please update to graceful-fs@^4.0.0 as soon as possible.
script@0.0.0 /home/linfeiyang/Documents/script
├── blueimp-md5@2.1.0 extraneous
├── exceljs@0.2.4 extraneous
├── moment@2.11.2 extraneous
└── xlsx@0.8.0 extraneous

i get this error when i use it.