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I solved this problem this way:

I run this command:

npm config set strict-ssl false
Then set npm to run with http, instead of https:

npm config set registry "http://registry.npmjs.org/"

Este ultimo talvez não seja preciso, caso seja:

Then I install packages using this syntax:

npm --proxy http://username:password@cacheaddress.com.br:80 \
install packagename

OU (que foi como fiz)

npm config set proxy http://185.70.189.59:58591
npm config set https-proxy http://185.70.189.59:58591