Support new the app directory's Route Handlers of Next.js v13.3

[yoieh]

Expected working example:

import { NextApiHandler } from "next";
import { NextWebSocketHandler } from "next-plugin-websocket";

export const socket: NextWebSocketHandler = (client, req) => {
  console.log("Client connected");

  client.on("message", (msg) => {
    client.send(msg);
  });

  client.on("close", () => {
    console.log("Client disconnected");
  });
};

export async function GET(request: Request) {
  return new Response("Upgrade Required", {
    status: 426,
  });
}

After PR #6 has been merged it will give an error if you try and use the above example.

error - unhandledRejection: PageNotFoundError: Cannot find module for page: /api/ws
    at findPagePathData (.../node_modules/next/dist/server/dev/on-demand-entry-handler.js:272:15)
    at async Object.ensurePage (.../node_modules/next/dist/server/dev/on-demand-entry-handler.js:444:38)
    at async Server.<anonymous> (.../node_modules/next-plugin-websocket/dist/index.js:88:13) {
  code: 'ENOENT'
}

It only works with the old pages directory.

[yoieh]

I tried get my self a deeper understanding of how this would work with the new app dir in 13.3.

Even if you find and require the route file socket never gets exported.

May need to find a different approach here.