how i can add turf library to my custom visual

I am trying to add turf library to my custom visual by using this commands:

npm install @turf/turf

npm install @turf/turf --save

npm install @turf/turf -g

 but always the custom visual shows this error:

" Uncaught ReferenceError: turf is not defined"

Any suggestion.

Thanks,

khetam.