cors is hanging

[dcsan]

I have a very simple app as below, but on adding the app.use(cors) it causes the app to hang indefinitely on all requestss
I disabled all other related config packages

as soon as I comment out app.use(cors); everything works again.

seems really simple - what could be wrong?

import cors from "cors";

import express, { Application } from "express";
// import compression from "compression";
// import cookieParser from "cookie-parser";
// import helmet from "helmet";
// import morgan from "morgan";

const ExpressConfig = (): Application => {
  const app = express();
  app.options("*", cors()); // include before other routes
  app.use(cors);

  app.use(express.json());

  return app;
};

export default ExpressConfig;

// server.ts

function setup() {
  const app = ExpressConfig();
  app.get("/", (_req: any, res) => {
    res.send("Hello World");
  });
app.listen(PORT, () => console.log("Server Running on Port " + PORT));
}

setup();

# package.json
  "dependencies": {
    "@types/morgan": "^1.9.7",
    "compression": "^1.7.4",
    "cookie-parser": "^1.4.6",
    "cors": "^2.8.5",
    "express": "^4.18.2",
    "helmet": "^6.0.1",
    "morgan": "^1.10.0"
  },

node -v
v18.16.1

[dcsan]

and I just see pending request in the network tab

[dcsan]

doh!

  app.use(cors); // wrong!
  app.use(cors() ); // right!