Good you finally learned how to count lines writing this post :)

$ tree node_modules/ | count
zsh: command not found: count
$ tree node_modules/ | lines
zsh: command not found: lines
$ tree node_modules/ | wc -lines
wc: illegal option — i
usage: wc [-clmw] [file …]
$ tree node_modules/ | wc -countlines
wc: illegal option — o
usage: wc [-clmw] [file …]
$ man wc
$ tree node_modules/ | wc -l
  292