astro/examples/framework-multiple/astro.config.mjs

export default {
  // projectRoot: '.',     // Where to resolve all URLs relative to. Useful if you have a monorepo project.
  // pages: './src/pages', // Path to Astro components, pages, and data
  // dist: './dist',       // When running `astro build`, path to final static output
  // public: './public',   // A folder of static files Astro will copy to the root. Useful for favicons, images, and other files that don’t need processing.
  buildOptions: {
    // site: 'http://example.com',  // Your public domain, e.g.: https://my-site.dev/. Used to generate sitemaps and canonical URLs.
    // sitemap: true,      // Generate sitemap (set to "false" to disable)
  },
  devOptions: {
    // port: 3000,         // The port to run the dev server on.
    // tailwindConfig: '', // Path to tailwind.config.js if used, e.g. './tailwind.config.js'
  },
  renderers: ['@astrojs/renderer-preact', '@astrojs/renderer-react', '@astrojs/renderer-svelte', '@astrojs/renderer-vue', '@astrojs/renderer-solid'],
};