morten-olsen.github.io/bin/dev/server.ts

import express, { Express } from "express";
import { Bundler } from "../bundler";
import { extname } from "path";

const createServer = (bundler: Bundler): Express => {
  const app = express();
  app.use((req, res) => {
    let path = req.path;
    let asset = bundler.get(path);
    if (!asset) {
      path = path.endsWith("/") ? path + "index.html" : path + "/index.html";
      asset = bundler.get(path);
    }
    if (asset) {
      const ext = extname(path);
      asset.data.then((data) => {
        if (ext === ".html") {
          const unsubscribe = asset!.subscribe(async () => {
            await asset?.data;
            unsubscribe();
            res.end(`<script>window.location.reload()</script>`);
          });
          res.on("close", unsubscribe);
          res.on("finish", unsubscribe);
          res.on("error", unsubscribe);
          res.writeHead(200, {
            "content-type": "text/html;charset=utf-8",
            "Cache-Control": "no-cache, no-store, must-revalidate",
            Pragma: "no-cache",
            Expires: "0",
            "keep-alive": "timeout=5, max=100",
          });
          res.write(data.content.toString().replace("</html>", ""));
        } else {
          res.send(data.content);
        }
      });
    } else {
      res.status(404).send("Not found");
    }
  });

  return app;
};

export { createServer };