The Twitch Extensions Boilerplate acts as a starting point. It is a simple method using Docker to locally serve your Extension for testing and development.
You will need:
cd certs
./generate_local_ssl.sh
# Requires a sudo password so that the cert can be installed on the root keychain
# If this install fails, see the README in ./certs for manual override.
docker-compose up --build
Please consult the Twitch Extensions documentation on the Twitch developer site