download file modern js without npm using bash

domodernjs.sh

#ref: https://gist.github.com/hrwgc/7455343
function validate_url(){
  if [[ `wget -S --spider $1  2>&1 | grep 'HTTP/1.1 200 OK'` ]]; then echo "true"; fi
}

# file list of url
file="listlib.txt"

while IFS= read -r line; do
  if `validate_url $line > /dev/null`; then wget $line -P /path/lib/; else echo "doesn't exist"; fi
done < "$file"

listlib.txt

https://unpkg.com/react@16/umd/react.development.js
https://unpkg.com/react-dom@16/umd/react-dom.development.js
https://unpkg.com/babel-standalone@6.15.0/babel.min.js