robots-txt.config.js

const NODE_ENV = process.env.NODE_ENV;
const NETLIFY_SITE_URL = process.env.URL || 'https://ladc.dev/';
const NETLIFY_DEPLOY_URL = process.env.DEPLOY_PRIME_URL || NETLIFY_SITE_URL;
const NETLIFY_ENV = process.env.CONTEXT || NODE_ENV;

const isNetlifyProduction = NETLIFY_ENV === 'production';
const siteUrl = isNetlifyProduction ? NETLIFY_SITE_URL : NETLIFY_DEPLOY_URL;

module.exports = {
    resolveEnv: () => NETLIFY_ENV,
    env: {
        production: {
            policy: [{ userAgent: '*', disallow: '/form-success' }],
            sitemap: `${siteUrl}/sitemap.xml`,
            host: siteUrl,
        },
        'branch-deploy': {
            policy: [{ userAgent: '*', disallow: ['/'] }],
            sitemap: null,
            host: null,
        },
        'deploy-preview': {
            policy: [{ userAgent: '*', disallow: ['/'] }],
            sitemap: null,
            host: null,
        },
        development: {
            policy: [{ userAgent: '*', disallow: ['/'] }],
        },
    },
};