notifier.ts
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notifier.ts
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	import WebSocket from "ws";

	export function make_notifier(port: number) {
	const server = new WebSocket.Server({
	port,
	});

	let sockets: WebSocket[] = [];
	server.on("connection", function (socket) {
	sockets.push(socket);

	// When a socket closes, or disconnects, remove it from the array.
	socket.on("close", function () {
	sockets = sockets.filter((s) => s !== socket);
	});
	});

	console.log("build notifier listening on websocket at port " + port);
	return function notify(message: string) {
	sockets.forEach((s) => s.send(message));
	};
	}