Clean up previous build after a webpack build. Used in production at https://remotebase.io

cleanup_example.sh

# Store the filenames of previous build
PREVIOUS_BUILD=(./static/dist/*)

# ...
# build using webpack
# ...

# after the build

regex="([a-zA-Z_0-9]+)-([0-9a-z]+)\.(.*)"

for file in "${PREVIOUS_BUILD[@]}"
do
  if [[ $file =~ $regex ]]
  then
    filename="${BASH_REMATCH[1]}"
    hash="${BASH_REMATCH[2]}"
    ext="${BASH_REMATCH[3]}"

    if test -n "$(find ./static/dist -name "${filename}-[0-9a-z]*\.${ext}" ! -name "${filename}-${hash}*")"
    then
      # A newly generated file exists. Remove the old file.
      rm "${file}"
    fi
  fi
done