A bash script to be able to run `yarn display-npm-updates` and safely run ncu (npm-check-updates) with a warning message if the user / dev does not have it installed

npm-check-updates.sh

#!/bin/bash

echo 'checking for package.json updates using npmjs.com/package/npm-check-updates' >&2

# define some fun output colors - https://stackoverflow.com/questions/5947742
RED='\033[0;31m'
BLUE='\033[0;34m'
YELLOW='\033[1;33m'
GREEN='\033[0;32m'
NC='\033[0m' # No Color

# check if user has ncu installed
if ! [ -x "$(command -v ncu)" ]; then
  # kindly prompt them that, we'd like the developer to install npm-check-updates
  echo '' >&2
  echo -e "${BLUE}===================================================================================${NC}" >&2
  echo -e "${YELLOW}Warning:${NC} ${GREEN}``ncu`` (npm-check-updates)${NC} is not installed." >&2
  echo '' >&2
  echo 'This is useful for keeping this project up to date.' >&2
  echo '' >&2
  echo -e "Please run, ${RED}``yarn global add npm-check-updates``${NC}," >&2
  echo 'so we can display available npm updates during local CRA development scripts.' >&2
  echo '' >&2
  echo '(if you are seeing this on CI, then make sure to install ``ncu`` on the base image:' >&2
  echo ' BASE_IMAGE)' >&2
  echo -e "${BLUE}===================================================================================${NC}" >&2
  echo '' >&2
else
  # run the check of package.json dependencies
  ncu
fi


# exit gracefully
exit 0

package.json

{
	"scripts": {
		"display-npm-updates": "npm-check-updates.sh"
	}
}

would run chmod u+x npm-check-updates.sh to make this executable (https://stackoverflow.com/questions/8779951)