index.ts

import dotenv from "dotenv";

// Important: Don't place any imports above dotenv.config() as they use environment variables that needs to be loaded first
dotenv.config();

import { startServer, closeServer } from "./server";

async function gracefulShutdown(signal: string): Promise<void> {
  console.log(signal);
  console.log("Gracefully stopping... (press Ctrl+C again to force)");
  try {
    await closeServer();
    process.exit(0);
  } catch (err) {
    console.error(err);
    process.exit(1);
  }
}

function catchTermination(): void {
  process.once("SIGUSR2", () => process.kill(process.pid, "SIGUSR2")); // For nodemon graceless restarts
  const signals = ["SIGHUP", "SIGINT", "SIGTERM", "SIGQUIT"];
  signals.forEach((signal: any) => process.once(signal, gracefulShutdown));
}

(async function main(): Promise<void> {
  try {
    await startServer();
    catchTermination();
  } catch (err) {
    console.error(err);
    process.exit(1);
  }
})();