server.js

const path = require("path");
const express = require("express");
const compression = require("compression");
const morgan = require("morgan");
const { createRequestHandler } = require("@remix-run/express");

////////////////////////////////////////////////////////////////////////////////
let app = express();

app.use(compression());

app.use(
  express.static("public", {
    immutable: true,
    maxAge: "1y",
  })
);

app.all(
  "*",
  process.env.NODE_ENV !== "production" ? devHandler() : prodHandler()
);

let port = process.env.PORT || 3000;

app.listen(port, () => {
  console.log(`Express server started on http://localhost:${port}`);
});

////////////////////////////////////////////////////////////////////////////////
function purgeAppRequireCache() {
  let cwd = process.cwd();
  for (let key in require.cache) {
    if (key.startsWith(path.join(cwd, "build"))) {
      delete require.cache[key];
    }
  }
}

function devHandler() {
  return (req, res, next) => {
    purgeAppRequireCache();
    return createRequestHandler({
      build: require("./build"),
      getLoadContext,
    })(req, res, next);
  };
}

function prodHandler() {
  return createRequestHandler({
    build: require("./build")
  });
}