server.js

/* eslint-env node */

// init project
const process = require("process");
const path = require("path");
const express = require("express");
const app = express();
require("dotenv").config();

app.use(express.static("build"));

// Website endpoint
app.get("/", (request, response) => {
  response.sendFile(path.resolve(__dirname, "build/client.html"));
});

// Tweet-making endpoint
app.get(`/${process.env.tweetEndpoint}`, (request, response) => {
  response.status(501).send("Twitter bot in development.");
});

// listen for requests
const listener = app.listen(process.env.PORT, () => {
  const port = listener.address().port;
  const domain = "localhost";
  const host = `${domain}:${port}`;
  const devMessage = `Your app is live at http://${host}`;
  const prodMessage = `Your app is listening on port ${port}`;
  console.log(
    process.env.NODE_ENV === "development" ? devMessage : prodMessage
  );
});