Hide certain files in NERDTree

You want to use the NERDTreeIgnore option, for example: let NERDTreeIgnore=['\.o$', '\~$']

Do :help NERDTreeIgnore for more information.

Hoping this might be helpful as per New NerdTree Documentation.

// put this in your .vimrc
set wildignore+=*.pyc,*.o,*.obj,*.svn,*.swp,*.class,*.hg,*.DS_Store,*.min.*

// Nerdtree config for wildignore
let NERDTreeRespectWildIgnore=1