How to Install sass-brunch

I used
Erlang/OTP 22 [erts-10.5.6] [source] [64-bit] [smp:2:2] [ds:2:2:10] [async-threads:1] [hipe]

IEx 1.9.1 (compiled with Erlang/OTP 21)

I try to install sass-brunch in repository assets

npm install sass-brunch --save-dev

and then I open package.json from the assets folder I did not find sass-brunch among other devDependencies

@syukri did you cd assets first?

yes, @benwilson512 I did in cd assets