next.config.js

const { parsed: localEnv } = require("dotenv").config();

module.exports = {
  publicRuntimeConfig: {
    CONTACT_EMAIL: localEnv && localEnv.CONTACT_EMAIL,
    SITE_NAME: localEnv && localEnv.SITE_NAME,
    DEFAULT_DOMAIN: localEnv && localEnv.DEFAULT_DOMAIN,
    RECAPTCHA_SITE_KEY: localEnv && localEnv.RECAPTCHA_SITE_KEY,
    REPORT_EMAIL: localEnv && localEnv.REPORT_EMAIL,
    DISALLOW_ANONYMOUS_LINKS: localEnv && localEnv.DISALLOW_ANONYMOUS_LINKS,
    DISALLOW_REGISTRATION: localEnv && localEnv.DISALLOW_REGISTRATION
  }
};