Next.js 12-factor App Support

next-js-12-factor-app-support.sh

# -------------------------- .docker/entrypoint.sh --------------------------

#!/bin/bash
DIR=".next"

find "${DIR}" -type f | while read -r file; do
    for var in $(env | cut -d= -f1 | grep '^NEXT_PUBLIC'); do
        PATTERN="\$${var}"
        NEW_VALUE=$(eval echo "\$$var")
        SED_COMMAND="s|${PATTERN}|${NEW_VALUE}|g"

        sed -i "${SED_COMMAND}" "${file}"
    done
done

HOSTNAME="0.0.0.0" yarn start

# -------------------------- Dockerfile --------------------------

CMD sh .docker/entrypoint.sh

# -------------------------- NEXT_PUBLIC_* envs usage --------------------------

const MY_API_KEY = process.env.NEXT_PUBLIC_MY_API_KEY || "$NEXT_PUBLIC_MY_API_KEY";