server.ts for bun + remix

server.ts

import type { ServerBuild } from "@remix-run/node";
import { createRequestHandler } from "@remix-run/server-runtime";
import { serve } from "bun";
import { resolve } from "node:path";

process.env.REMIX_DEV_ORIGIN = "https://localhost";

// @see https://remix.run/docs/en/main/future/vite#migrating-a-custom-server
const viteDevServer =
  process.env.NODE_ENV === "production"
    ? undefined
    : await import("vite").then((vite) =>
        vite.createServer({
          server: { middlewareMode: true },
          appType: "custom",
        }),
      );

const BUILD_PATH = "./build/server/index.js";

const build: ServerBuild = viteDevServer
  ? () => viteDevServer.ssrLoadModule("virtual:remix/server-build")
  : await import(BUILD_PATH);

const remix = createRequestHandler(build, process.env.NODE_ENV);

serve({
  development: true,
  port: 3000,
  hostname: "localhost",
  async fetch(request: Request) {
    const url = new URL(request.url);

    let file = Bun.file(resolve(__dirname, "../public/", `.${url.pathname}`));
    if (await file.exists()) {
      return new Response(file);
    }

    const loadContext = {};

    const response = await remix(request, loadContext);
    console.log(response);

    return response;
  },
});