How to –correctly­– pass the result of 'npm list --global --parseable 2> /dev/null | grep generator' to the while loop, in order to extract unique module name

npm-list-modules.bash

#!/usr/bin/env bash

dir=$1

if [[ ! -z $dir ]]; then
  npm list --parseable 2> /dev/null | grep generator
else
  # moduleList=$(<"")
  while IFS= read -r module; do
    echo "$(basename $module)"
  done < "$(npm list --global --parseable 2> /dev/null | grep generator)"
fi

See http://mywiki.wooledge.org/ProcessSubstitution

Here is what I did

#!/usr/bin/env bash

workingDir=$1

if [[ $workingDir ]]; then
  npm list --parseable 2> /dev/null | grep generator
else
  npm list --global --parseable 2> /dev/null \
    | grep generator \
    | while read line; do \
        basename $line; \
      done \
    | sort -d \
    | uniq
fi