Writes configuration file for multi-adapter Astro site

astro.config.mjs

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+import { defineConfig } from 'astro/config';
+
+// Integrations
+// import svelte from '@astrojs/svelte';
+import react from "@astrojs/react";
+import partytown from '@astrojs/partytown';
+import sitemap from '@astrojs/sitemap';
+
+// Adapters
+import vercelAdapter from '@astrojs/vercel/serverless';
+import netlifyAdapter from '@astrojs/netlify';
+import nodeAdapter from '@astrojs/node';
+import cloudflareAdapter from '@astrojs/cloudflare';
+
+// Helper function to unwrap both Vite and Node environment variables
+const unwrapEnvVar = (varName, fallbackValue) => {
+  const classicEnvVar = process?.env && process.env[varName];
+  const viteEnvVar = import.meta.env[varName];
+  return classicEnvVar || viteEnvVar || fallbackValue;
+}
+
+// Determine the deploy target (vercel, netlify, cloudflare, node)
+const deployTarget = unwrapEnvVar('DEPLOY_TARGET', 'node');
+
+// Determine the output mode (server, hybrid or static)
+const output = unwrapEnvVar('OUTPUT', 'hybrid');
+
+// The FQDN of where the site is hosted (used for sitemaps & canonical URLs)
+const site = unwrapEnvVar('SITE_URL', 'https://web-check.xyz');
+
+// The base URL of the site (if serving from a subdirectory)
+const base = unwrapEnvVar('BASE_URL', '/');
+
+// Initialize Astro integrations
+const integrations = [react(), partytown(), sitemap()];
+
+// Set the appropriate adapter, based on the deploy target
+function getAdapter(target) {
+  switch(target) {
+    case 'vercel':
+      return vercelAdapter();
+    case 'netlify':
+      return netlifyAdapter();
+    case 'cloudflare':
+      return cloudflareAdapter();
+    case 'node':
+      return nodeAdapter({ mode: 'middleware' });
+    default:
+      throw new Error(`Unsupported deploy target: ${target}`);
+  }
+}
+const adapter = getAdapter(deployTarget);
+
+// Print build information to console
+console.log(
+  `\n\x1b[1m\x1b[35m Preparing to start build of Web Check.... \x1b[0m\n`,
+  `\x1b[35m\x1b[2mCompiling for "${deployTarget}" using "${output}" mode, `
+  + `to deploy to "${site}" at "${base}"\x1b[0m\n`,
+  `\x1b[2m\x1b[36m🛟 For documentation and support, visit the GitHub repo: ` +
+  `https://github.com/lissy93/web-check \n`,
+  `💖 Found Web-Check useful? Consider sponsoring us on GitHub ` +
+  `to help fund maintenance & development.\x1b[0m\n`,
+);
+
+const buildOptions = {
+  output: 'dist',
+  format: 'esm',
+};
+
+
+const redirects = {
+  '/': '/test',
+  // '/results/[...target]': '/check/[...target]', // The old path was /results (redirect to maintain compatibility)
+}
+
+// Export Astro configuration
+export default defineConfig({ output, base, integrations, site, adapter, redirects, buildOptions });
+