Find in webpack builds modules that are never imported

removeUnusedModules.sh

#!/bin/bash

echo "Testing prod build for modules in src that aren't ever imported."
echo
echo "NOTE: Any dev-only imports will appear to be unused."

USED_LIST_PATH=usedModules.txt

STATS_PATH=public/assets/stats.json

if [ ! -e $USED_LIST_PATH ]; then
  echo Building module stats
  yarn build-prod
  jq .modules[].name $STATS_PATH |tr -d '"' > $USED_LIST_PATH
fi

SELECT_RE=".*\.(jsx?|s?css)$"

src_modules=`find -E src -regex $SELECT_RE | grep -v -E "__tests__|mocks|dev|fixtures|mixins"`

echo "These modules are never built into Webpack:"
for module in $src_modules ; do
  grep --quiet $module usedModules.txt
  if [[ $? != 0 ]]; then
    echo $module
  fi
done