server.ts

import config from "config";
import logger from "./utils/logger";
import * as http from "http";
import app from "./app";
import { version } from "./package.json";
import ErrnoException = NodeJS.ErrnoException;

// Initialise globals
global.config = config;
global.logger = logger;

const port: number = config.get("port");
app.set("port", port);

/**
 * Create HTTP server.
 */

const server = http.createServer(app);

/**
 * Listen on provided port, on all network interfaces.
 */

server.listen(port);
server.on("error", onError);
server.on("listening", onListening);

/**
 * Event listener for HTTP server "error" event.
 */

function onError(error: ErrnoException): ErrnoException {
  if (error.syscall !== "listen") {
    throw error;
  }

  const bind = `Port ${port}`;

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case "EACCES":
      logger.error(bind + " requires elevated privileges");
      process.exit(1);
      // eslint-disable-next-line no-unreachable
      break;

    case "EADDRINUSE":
      logger.error(bind + " is already in use");
      process.exit(1);
      // eslint-disable-next-line no-unreachable
      break;

    default:
      throw error;
  }
}

/**
 * Event listener for HTTP server "listening" event.
 */

function onListening(): void {
  logger.info(
    `Express API running on port:${port} with environment:${String(
      process.env.NODE_ENV
    )}`,
    { version }
  );
}

export default server;