$ npm i grunt grunt-contrib-watch
I recommend using npm install (no further parameters) instead. Since those packages are listed within devDependencies they will be installed as long you don't add --production.
I was going to post this in "Feature Requests" but then I noted during my search for "reader view" that I did indeed have the reader view icon now available. So I thought maybe a new feature w/the latest and greatest newest version but as I browsed about community I noted that sometimes it was available while others not. Some threads provide the option, others not. I thought maybe NodeBB devs were being slick and correlated it w/thread length/post count or some such but there does not seem to be the case. The only place it consistently seems to be available is search page results.
I use Firefox. Admittedly my browser config is non standard but I'd mentioned this to a Safari user a few days back and reader view is absent from their browser as well.
Presuming I am not having a brain dead moment Reader View would be a dandy feature to have available where appropriate. If I am having a brain dead moment, clue bats appreciated.