create astro-fastify

astro-fastify/astro.config.ts

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+import { defineConfig } from "astro/config";
+import node from "@astrojs/node";
+
+export default defineConfig({
+  output: "server",
+  adapter: node({
+    mode: "middleware",
+  }),
+});

astro-fastify/package.json

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+{
+  "name": "@kou029w/astro-fastify",
+  "version": "0.0.0",
+  "private": true,
+  "license": "MIT",
+  "type": "module",
+  "scripts": {
+    "dev": "fastify start --log-level=info --debug --watch server.js -- --dev",
+    "build": "astro build",
+    "start": "fastify start server.js"
+  },
+  "devDependencies": {
+    "@astrojs/node": "^8.2.5",
+    "@fastify/http-proxy": "^9.5.0",
+    "@fastify/middie": "^8.3.0",
+    "@fastify/static": "^7.0.1",
+    "astro": "^4.5.9",
+    "fastify": "^4.26.2",
+    "fastify-cli": "^6.1.1"
+  }
+}

astro-fastify/public/public.txt

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+public

astro-fastify/server.js

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+import fastifyMiddie from "@fastify/middie";
+import fastifyStatic from "@fastify/static";
+import { fileURLToPath } from "node:url";
+
+/** @type {import("fastify").FastifyPluginAsync} */
+const app = async (fastify, opts) => {
+  fastify.get("/hello", async () => "hello");
+
+  if (opts.dev) {
+    const astro = await import("astro");
+    const astroDevServer = await astro.dev();
+    await fastify.register(await import("@fastify/http-proxy"), {
+      upstream: `http://localhost:${astroDevServer.address.port}`,
+    });
+  } else {
+    await fastify.register(fastifyStatic, {
+      root: fileURLToPath(import.meta.resolve("./dist/client")),
+    });
+    await fastify.register(fastifyMiddie);
+    const astroServer = await import("./dist/server/entry.mjs");
+    fastify.use(astroServer.handler);
+  }
+
+  fastify.get("/world", async () => "world");
+};
+
+export default app;

astro-fastify/src/env.d.ts

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+/// <reference types="astro/client" />

astro-fastify/src/pages/index.ts

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+import type { APIRoute } from "astro";
+
+export const GET: APIRoute = () => {
+  return new Response(
+    JSON.stringify({
+      number: Math.random(),
+    }),
+  );
+};