Tell spotlight to ignore node_modules in a subdirectory

spotlight_ignore_node_modules.sh

#!/usr/bin/env bash

# Use like:
#    spotlight_ignore_node_modules.sh ~

PROGNAME=$(basename $0)
BASE=${1:-$HOME}
red=$(tput setaf 1)
green=$(tput setaf 2)
yellow=$(tput setaf 3)
reset=$(tput sgr0)

set -e

find $BASE -type d -name 'node_modules' | while read dir; do
  if [[ $(grep -o "node_modules" <<< "$dir" | grep ""  -c) == 1 ]]; then
    if [ -f "$dir/.metadata_never_index" ]; then
      echo "${PROGNAME}: ${yellow}$dir already has been ignored ${reset}"
    else
      echo "${PROGNAME}: ${green}Adding ignore to $dir ${reset}"
      touch "$dir/.metadata_never_index"
    fi
  fi
done
  # if [ `grep -o "Permission denied" <<< "$dir" | grep ""  -c` > 0 ]; then
  #   echo "${PROGNAME}: ${red}Permission denieded for `$dir` ${reset}"
  # fi

echo "${reset}All done"

That looks like not working on Catalina.