Checks whether all imported modules belong to domain objects in a typescript project

typescript_check_domain_imports.sh

# Checks whether all imported modules belong to domain objects inside domain
# Imported files must 
#   1. have a relative path, 
#   2. have the module's name enclosed by single or double quotes and 
#   3. not propagate outside the domain

filename=check_domain_imports.txt
basedir="src/Domain/"

grep -r -n 'import ' src/Domain/ > $filename

n=0

while read line; do
   IFS=':' read -r -a parts <<< "$line"
   path=${parts[0]}
   line=${parts[1]}
   import=${parts[2]}

   separators="${path//[^\/]}"
   max_escape=$(( "${#separators}" - 1 ))

   if [[ $path == "$basedir"* ]] && \
   ! [[ $import =~ \ from\ [\'\"]((./)|(../){1,${max_escape}})[a-zA-Z] ]]; then
      echo "$path:$line: $import"
      n=$((n+1))
   fi
done < $filename

echo "$n illegal imports found."
rm $filename

exit $n