Check the age of all your js files before committing (using husky)

check_source_age.sh

#!/bin/bash

DIR="$(cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd)"
FILES="$(find "$DIR"/src -type f -name '*.js' -not -name '*.test.js')"
IS_OLDER=false

for f in $FILES; do
    if [[ "$f" -nt bundle.js ]]; then
        echo "$f is newer than bundle.js"
        IS_OLDER=true
    fi
done

if [[ $IS_OLDER = true ]]; then
    echo
    echo "found source files newer than bundle.js (did you forget to run 'npm build'?)"
    exit 1
fi