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// @ts-check

/**

* Module dependencies.

*/

import { fileURLToPath } from 'node:url';

import express from 'express';

import open from 'open';

import { createProxyMiddleware } from '#http-proxy-middleware';

const currentDir = fileURLToPath(new URL('.', import.meta.url));

/**

* Configure proxy middleware

*/

const wsProxy = createProxyMiddleware({

target: 'https://echo.websocket.org',

// pathRewrite: {

// '^/websocket' : '/socket', // rewrite path.

// '^/removepath' : '' // remove path.

// },

changeOrigin: true, // for vhosted sites, changes host header to match to target's host

ws: true, // enable websocket proxy

logger: console,

});

const app = express();

app.use('/', express.static(currentDir)); // demo page

app.use(wsProxy); // add the proxy to express

const server = app.listen(3000);

server.on('upgrade', wsProxy.upgrade); // optional: upgrade externally

console.log('[DEMO] Server: listening on port 3000');

console.log('[DEMO] Opening: http://localhost:3000');

open('http://localhost:3000');

/**

* Example:

* Open http://localhost:3000 in WebSocket compatible browser.

* In browser console:

* 1. `const socket = new WebSocket('ws://localhost:3000');` // create new WebSocket

* 2. `socket.onmessage = function (msg) {console.log(msg)};` // listen to socket messages

* 3. `socket.send('hello world');` // send message

* > {data: "hello world"} // server should echo back your message.

**/