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astro.config.mjs

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+import { defineConfig } from "astro/config";
+import react from "@astrojs/react";
+import mdx from "@astrojs/mdx";
+import sitemap from "@astrojs/sitemap";
+
+// joshbairstow.com is the apex. Subdomains (blog., art., code.) are served from this
+// same build via the reverse proxy mapping host -> path prefix (see docs/planning.md §6.2).
+// `site` here drives canonical URLs in generated metadata and the sitemap.
+export default defineConfig({
+  site: "https://joshbairstow.com",
+  integrations: [react(), mdx(), sitemap()],
+  output: "static",
+  build: {
+    format: "directory",
+  },
+  vite: {
+    server: {
+      // Allow the dev server to be hit by the local subdomain hostnames if you alias
+      // them in /etc/hosts. Keeps testing the cross-subdomain link behavior easy.
+      host: true,
+    },
+  },
+});