`npm ls` has a bug in some versions when "--parseable --depth=0" is used together.

nvm.sh

@@ -789,7 +789,7 @@ nvm() {
 
       # declare local INSTALLS first, otherwise it doesn't work in zsh
       local INSTALLS
-      INSTALLS=$(nvm use $VERSION > /dev/null && npm list --global --parseable --depth=0 2> /dev/null | tail -n +2 | \grep -o -e '/[^/]*$' | cut -c 2- | \grep -v npm | xargs)
+      INSTALLS=$(nvm use "$VERSION" > /dev/null && npm list -g --depth=0 | tail -n +2 | \grep -o -e ' [^@]*' | cut -c 2- | \grep -v npm | xargs)
 
       echo "$INSTALLS" | xargs npm install -g --quiet
     ;;

test/slow/nvm copy-packages/should work as expected

@@ -11,10 +11,10 @@ EXPECTED_PACKAGES="autoprefixer bower david eslint grunt-cli grunth-cli http-ser
 echo "$EXPECTED_PACKAGES" | xargs npm install -g --quiet
 
 nvm use 0.10.29
-ORIGINAL_PACKAGES=$(npm list --global --parseable --depth=0 2> /dev/null | tail -n +2 | \grep -o -e '/[^/]*$' | cut -c 2- | \grep -v npm | sort | uniq | xargs)
+ORIGINAL_PACKAGES=$(npm list -g --depth=0 | tail -n +2 | \grep -o -e ' [^@]*' | cut -c 2- | \grep -v npm | sort | uniq | xargs)
 
 nvm copy-packages 0.10.28
-FINAL_PACKAGES=$(npm list --global --parseable --depth=0 2> /dev/null | tail -n +2 | \grep -o -e '/[^/]*$' | cut -c 2- | \grep -v npm | sort | uniq | xargs)
+FINAL_PACKAGES=$(npm list -g --depth=0 | tail -n +2 | \grep -o -e ' [^@]*' | cut -c 2- | \grep -v npm | sort | uniq | xargs)
 
 [ "$FINAL_PACKAGES" = "$EXPECTED_PACKAGES" ] || die "final packages ($FINAL_PACKAGES) did not match expected packages ($EXPECTED_PACKAGES)"
 [ "$ORIGINAL_PACKAGES" != "$FINAL_PACKAGES" ] || die "original packages matched final packages ($ORIGINAL_PACKAGES)"