How to run Istanbul code coverage for multiple js files in single folder?

I want generate code coverage report for multiple java script files present in single folder

I tried the below ways but not worked

istanbul cover models/*.js
istanbul cover -- OAOApplicationSchema.js OAOPropertyDetails.js
istanbul cover OAOApplicationSchema.js OAOPropertyDetails.js

how to generate in single run to all files and also suggest me any other good library present to achieve this

via rselvaganesh